Merge remote-tracking branch 'origin/main' into screens

# Conflicts: # .claude/settings.local.json # CLAUDE.md # bolt_pet/controller.py
Multi-monitor jumps, screen OCR, and generated sprite art
2026-07-28 16:19:45 -06:00 · 2026-07-28 16:17:40 -06:00 · 2026-07-26 19:10:14 -06:00
51 changed files with 2463 additions and 50 deletions
@@ -31,6 +31,16 @@
      "Bash(git remote *)",
      "Bash(grep -v '^$')",
      "Bash(.venv/bin/pip install *)",
+      "Bash(QT_QPA_PLATFORM=offscreen .venv/bin/python *)",
+      "Bash(python3 *)",
+      "Bash(.venv/bin/pytest tests/test_monitors.py -q)",
+      "Bash(QT_QPA_PLATFORM=offscreen .venv/bin/pytest tests/test_pet_window_features.py -q)",
+      "Bash(git fetch *)",
+      "Bash(git switch *)",
+      "Bash(git add *)",
+      "Bash(git merge *)",
+      "Bash(echo \"=== EXIT: $? ===\")",
+      "Bash(git commit *)",
      "Bash(QT_QPA_PLATFORM=offscreen /root/Documents/bolt-pet/.venv/bin/pytest tests/ -q)",
      "Bash(.venv/bin/pytest tests/test_desk_api.py tests/test_desk_files.py tests/test_desk_voice.py tests/test_desk_status.py tests/test_desk_keys.py tests/test_desk_guild_action.py tests/test_desk_admin.py tests/test_desk_billing_auth.py -q)",
      "Bash(docker inspect *)",
@@ -40,7 +50,9 @@
      "Bash(python3 -c ' *)",
      "Bash(QT_QPA_PLATFORM=offscreen /root/Documents/bolt-pet/.venv/bin/pytest /home/themajesticmagician/Documents/Bolt-Pet/tests/ -q)",
      "Bash(docker exec bolt *)",
-      "Bash(QT_QPA_PLATFORM=offscreen /root/Documents/bolt-pet/.venv/bin/pytest /home/themajesticmagician/Documents/Bolt-Pet/tests/test_file_ops.py -q)"
+      "Bash(QT_QPA_PLATFORM=offscreen /root/Documents/bolt-pet/.venv/bin/pytest /home/themajesticmagician/Documents/Bolt-Pet/tests/test_file_ops.py -q)",
+      "Bash(grep -rn *)",
+      "Bash(git ls-tree *)"
    ]
  }
 }
@@ -113,6 +113,30 @@ ELEVENLABS_VOICE_ID=
 # error?" has a referent. Text only — no screenshots leave the machine.
 #SCREEN_CONTEXT=true

+# ── Monitors (optional) ─────────────────────────────────────────────────────
+# Tacks a one-line summary of your screen layout onto each utterance (how
+# many, their sizes, which one the pet is standing on) so Bolt can decide to
+# `petctl jump 2` without asking what you've got plugged in. Costs nothing —
+# the list comes from the UI, nothing is probed per turn.
+#MONITOR_CONTEXT=true
+
+# ── Screen text / OCR (optional) ────────────────────────────────────────────
+# Lets Bolt read what's actually on a monitor with `petctl read [n|here|all]`
+# and use it in his reply. Pull-only — nothing is captured unless he asks,
+# and every read is logged.
+#
+# Needs the extras from requirements.txt plus an OCR engine:
+#     pip install mss pytesseract && sudo apt install tesseract-ocr
+#   or, without sudo:
+#     pip install mss rapidocr-onnxruntime
+# mss captures on X11/Windows/macOS but NOT Wayland.
+#
+# This sends the text of a whole screen to the server when used. That's not a
+# new capability — the shell relay could already screenshot and OCR — but it's
+# a far easier one to reach for. SCREEN_TEXT=false removes it entirely.
+#SCREEN_TEXT=true
+#SCREEN_TEXT_MAX_CHARS=4000
+
 # ── Quiet hours / do-not-disturb (optional) ────────────────────────────────
 # Comma-separated HH:MM-HH:MM ranges; wrapping past midnight is fine. While
 # napping the pet dims, stops wandering and makes no proactive noise — the
@@ -11,13 +11,18 @@ dependency** on the server repo; it's a standalone HTTP client configured via
 its own `.env`.

 Pipeline: `mic → openWakeWord ("thunderbolt", on-device) / push-to-talk /
-click → record utterance → Deepgram STT → + active-window context → POST
-/desk/converse → [server may relay a shell command to run on this machine, or
-a `petctl` pseudo-command that moves/emotes the pet instead] → reply →
+click → record utterance → Deepgram STT → + active-window + screen-layout
+context → POST /desk/converse → [server may relay a shell command to run on
+this machine, or a `petctl` pseudo-command that moves/emotes the pet, jumps it
+to another monitor, or reads a screen's text back instead] → reply →
 ElevenLabs streaming TTS (or offline pyttsx3 fallback) → speakers`, with the
 pet sprite/speech bubble reflecting state throughout, and playback
 interruptible by talking over it (barge-in).

+Because a relayed command's output goes back up the tool-result relay before
+the final reply, a `petctl read` mid-turn means Bolt can look at a monitor and
+then talk about what's on it in the same answer.
+
 Side channels that let the pet act between turns: the heartbeat (proactive
 announcements), the desktop notification bridge, and autonomous wandering —
 all suppressed while it's napping (quiet hours / fullscreen DND).
@@ -34,6 +39,9 @@ run.bat           # Windows
 QT_QPA_PLATFORM=offscreen .venv/bin/pytest tests/
 .venv/bin/pytest tests/test_state.py::test_happy_path_transitions  # single test

+# Redraw the pet's sprite frames (the committed PNGs are this script's output)
+python scripts/generate_bolt_sprites.py             # --out /tmp/x to preview first
+
 # Convert a grid sprite sheet into the per-frame-PNG convention sprite.py expects
 python scripts/slice_spritesheet.py path/to/sheet.png assets/sprites/idle --cols 6 --rows 1
 ```
@@ -107,11 +115,17 @@ logs a missing-config message and exits its thread instead of starting.
  accepts an injectable stream/model/protocol so tests don't need real audio
  hardware or a display.
 - **`pet_actions.py`** — `petctl` pseudo-commands (`petctl move top-left`,
-  `petctl emote wave`, `say`/`wander`/`nap`). The desk API has no "move the
-  pet" payload type and this repo can't change the server, so these ride the
-  existing shell-command relay: `controller._handle_command` parses them and
-  they never reach `subprocess`; anything else is a real shell command exactly
-  as before. Pure parsing; the UI half is `PetWindow.apply_action`.
+  `petctl emote wave`, `say`/`wander`/`nap`, plus the screen verbs
+  `jump`/`monitors`/`read`). The desk API has no "move the pet" payload type
+  and this repo can't change the server, so these ride the existing
+  shell-command relay: `controller._handle_command` parses them and they never
+  reach `subprocess`; anything else is a real shell command exactly as before.
+  Pure parsing; the UI half is `PetWindow.apply_action`. Note `jump`'s target
+  is *not* validated here — which monitors exist is a runtime fact this pure
+  module doesn't have, so the spec passes through to `monitors.resolve()`.
+  Query verbs (`monitors`, `read`) are answered in `_handle_command` rather
+  than by `pet_actions.describe()`, because their output *is* the point: it
+  goes back up the tool-result relay for Bolt to use in his reply.
 - **`file_ops.py`** — `filectl` pseudo-commands, checked in `_handle_command`
  right after petctl and before falling through to a real shell command.
  Executing arbitrary commands already worked via the shell relay
@@ -147,6 +161,29 @@ logs a missing-config message and exits its thread instead of starting.
  no images. Every probe is best-effort and returns None/False rather than
  raising; the parsing is split into pure functions that are tested without a
  display server.
+- **`monitors.py`** — the screen layout, and resolving `petctl jump` targets
+  (a 1-based number, a name, `next`/`prev`/`primary`/`other`, or a direction
+  like `left`/`up` worked out from the actual geometry). Pure — no Qt, no
+  subprocess. The monitor list is *published by the UI*
+  (`PetWindow.publish_monitors` builds it from `QGuiApplication.screens()` and
+  emits it over a queued signal to `controller.set_monitors`), because the
+  controller and the window must agree on what "monitor 2" means: enumerating
+  with `xrandr` on one side and Qt's screen list on the other gives different
+  orderings on the same machine, and Bolt would announce one screen and land
+  on another. Qt is the single source of truth; `Monitor.index` is 0-based and
+  `.number` is the 1-based value used in every string a human or the model
+  sees. The controller resolves a jump to a concrete index *before* emitting
+  it, so the window can't re-resolve against a different list.
+- **`screen_text.py`** — OCR, so Bolt can read what's on a monitor
+  (`petctl read [n|here|all]`). **Pull, not push**: nothing captures on its own
+  — the server has to ask, and the text goes back as that command's output.
+  That's deliberate; OCR of a 4K screen costs a second or two that would
+  otherwise be added to *every* utterance, and screen contents leaving the
+  machine should be a visible decision rather than a constant. Capture needs
+  `mss` (X11/Win32/macOS, **not** Wayland), recognition needs Tesseract or
+  RapidOCR; both are optional and soft-fail with a reason the way `hotkey.py`
+  does, and `read_monitor()` never raises because its return value is command
+  output. Engine selection takes injected probes so it's testable wherever.
 - **`quiet.py`** — quiet-hours spec parsing (`23:00-08:00`, wraps midnight,
  comma-separated). Napping suppresses *proactive* noise and wandering only;
  wake word / click / push-to-talk still work.
@@ -208,6 +245,15 @@ logs a missing-config message and exits its thread instead of starting.
    target every `PET_WANDER_INTERVAL_SECONDS` (randomized), suppressed
    whenever the pet is non-IDLE, napping, dragged, or has a bubble up. A
    commanded `petctl move` overrides all of that except the drag.
+  - **the walk cycle** — while actually travelling, `_animation_key()` swaps
+    the state animation for the side-view `walk/` frames (not a `PetState` —
+    see the sprites README). It is stepped by *distance travelled*
+    (`_WALK_PIXELS_PER_FRAME`), never by the animation timer, so the planted
+    paw tracks backwards at exactly the speed the window moves forwards;
+    `_advance_frame` deliberately no-ops while walking so the two can't
+    double-step it. The art is drawn facing right and `_oriented()` mirrors it
+    (cached per frame) when heading left. No `walk/` art → falls back to the
+    old coded bob rather than a placeholder blob.
  - **emotes** — `emote_transform()` is pure maths (dx, dy, rotation, scale
    from a 0..1 progress) kept out of `paintEvent` so the curves are unit
    tested; every emote must return to the identity transform at progress 1.0
@@ -220,9 +266,14 @@ logs a missing-config message and exits its thread instead of starting.
  - **edge snapping** (`PET_EDGE_SNAP`) after a drag or a stroll, and **nap
    dimming** (`set_napping`).
  `sprite.py` loads `assets/sprites/<state>/*.png` (filename-sorted, looping —
-  currently Kenney's CC0 robot pack, see `assets/sprites/README.md`) and falls
+  the art is *generated* by `scripts/generate_bolt_sprites.py`, a Pillow
+  drawing of Bolt as a shepherd pup; edit the script and re-run it rather than
+  the committed PNGs, see `assets/sprites/README.md`) and falls
  back to a procedurally-drawn placeholder blob per state if a folder has no
-  frames; `tray.py` is the system tray menu (talk now / mute / nap / wander /
+  frames. It also loads `EXTRA_ANIMATIONS` — currently just `walk/` — keyed by
+  name rather than by `PetState`, with `has()` reporting whether a key is
+  backed by real art so callers can decline a placeholder instead of trotting
+  a blob across the desktop; `tray.py` is the system tray menu (talk now / mute / nap / wander /
  click-through / history / wake-word tuning / quit) — the pet window has no
  title bar or taskbar entry; `history_window.py` and `wake_tuner.py` are the
  two dialogs it opens.
@@ -315,9 +366,23 @@ can't reach the user's PipeWire socket from a root session (raw ALSA devices
 reject the 16 kHz capture rate — `paInvalidSampleRate`), and every relayed
 command would run unconstrained.

-Two newer features widen what leaves this machine, both switchable in `.env`:
+Several features widen what leaves this machine, all switchable in `.env`:
 `SCREEN_CONTEXT` appends the focused window's *title* to each utterance
-(titles often contain file paths, document names, or subject lines), and
-`NOTIFICATION_BRIDGE` (off by default) forwards matching desktop
-notifications to the server. Neither sends screenshots or notification
-contents you haven't matched with `NOTIFICATION_FILTER`.
+(titles often contain file paths, document names, or subject lines),
+`MONITOR_CONTEXT` appends the screen layout (sizes and names only — no
+contents), and `NOTIFICATION_BRIDGE` (off by default) forwards matching
+desktop notifications to the server. None of those send screenshots or
+notification contents you haven't matched with `NOTIFICATION_FILTER`.
+
+`SCREEN_TEXT` is the biggest of them: `petctl read` OCRs a whole monitor and
+sends the recognised text to the server — everything visible, not just the
+focused window. Two things keep it honest. It's **pull-only**: no capture
+happens unless the server explicitly asks, so it can't leak in the background
+the way a per-turn annotation would, and each read is logged. And it is
+strictly *not* a new capability — the shell relay could already run a
+screenshot tool and pipe it through OCR — it just makes a thing the trust
+model already allowed reliable, bounded (`SCREEN_TEXT_MAX_CHARS`) and
+visible. It is nonetheless far easier to reach for than the shell route, so
+if that trade isn't one you want, `SCREEN_TEXT=false` removes it and
+`petctl read` starts reporting that it's disabled. Capture is `mss`-based and
+therefore silently unavailable on Wayland.
@@ -4,4 +4,4 @@ __version__ is what the auto-updater compares against the newest tag on the
 Gitea releases page (see updater.py), so bump it in the same commit you tag.
 """

-__version__ = "0.1.0"
+__version__ = "0.2.2"
@@ -1,37 +1,84 @@
 # Sprite assets

-Art: [Kenney's Robot Pack](https://kenney.nl/assets/robot-pack) (CC0 — no
-attribution required, credited here anyway), the green side-view robot.
-Source pack lives at `~/Documents/kenney_robot-pack`; only the frames listed
-below were copied in.
+Art: Bolt himself — a cream shepherd pup with a slate cap, a lightning blaze
+on his forehead and a bolt tag on his collar. The frames are **generated, not
+hand-drawn**: `scripts/generate_bolt_sprites.py` draws every one of them with
+Pillow and writes this folder.
+
+```bash
+python scripts/generate_bolt_sprites.py                  # rewrite this folder
+python scripts/generate_bolt_sprites.py --out /tmp/prev  # preview elsewhere first
+python scripts/generate_bolt_sprites.py --states idle    # just one state
+```
+
+That means tweaking the art is editing code, not 24 PNGs: the palette is a
+block of constants at the top of the script, the body/head/ear/tail shapes are
+one function each in normalised 0..1 coordinates, and each state's animation is
+a list of pose dicts in `frames_for()`. Everything is super-sampled 4x and
+downscaled on save, because PIL's draw primitives have no antialiasing.
+
+**Regenerate after editing** — the PNGs here are committed, so a change to the
+script alone doesn't move the pet.

 Convention the loader (`bolt_pet/ui/sprite.py`) expects:

 ```
 assets/sprites/
-  idle/        frame_00.png                    robot_greenBody   (standing)
-  listening/   frame_00.png, frame_01.png       robot_greenDrive1/2 (tracks rolling — "leaning in")
-  thinking/    frame_00.png, frame_01.png       robot_greenDamage1/2 (flicker — "processing")
-  talking/     frame_00.png, frame_01.png       robot_greenBody, robot_greenJump (bounce)
-  error/       frame_00.png                     robot_greenHurt
+  idle/        frame_00..07.png   breathing, tail wag, blink on frame 06
+  listening/   frame_00..03.png   ears perked, head tilted in, collar tag lit, sound arcs
+  thinking/    frame_00..05.png   eyes up, head cocked, cycling dots
+  talking/     frame_00..03.png   mouth open/close with tongue, ears bouncing
+  error/       frame_00..01.png   X eyes, ears drooped, red spark
+  walk/        frame_00..07.png   side-view walk cycle (see below)
 ```

- One subfolder per pet state (matches `bolt_pet.state.PetState`).
+- One subfolder per pet state (matches `bolt_pet.state.PetState`), **plus
+  `walk/`**, which is not a state — see below.
 - Any `*.png` filenames work — they're played back in alphabetical-sort
-  order, looping, at `IDLE_ANIMATION_FPS` (see `.env`).
- Frames are scaled to fit within `PET_SIZE` (default 160px), keeping aspect
-  ratio, and centered in the (square) pet window — the source art here isn't
-  square, so don't assume it fills the frame edge-to-edge.
+  order, looping, at `IDLE_ANIMATION_FPS` (see `.env`). At the default 6fps
+  the 8-frame idle loop runs about 1.3s.
+- Frames are square (320px, 2x the default `PET_SIZE` of 160) so they
+  downscale cleanly; the loader scales to fit `PET_SIZE` keeping aspect ratio
+  and centres them in the square pet window.
 - A state directory with no frames in it falls back to a small
  procedurally-drawn placeholder blob (see `_placeholder_frames` in
  `sprite.py`).

+## The walk cycle
+
+`walk/` is the one animation that isn't a `PetState`. Walking is a property of
+*movement* — orthogonal to whether he's idle, listening or talking — so it
+stays out of the state machine and is keyed by name instead
+(`sprite.EXTRA_ANIMATIONS`). `PetWindow` uses it whenever the pet is actually
+travelling and falls back to the state animation the moment it stops.
+
+Three things about it are load-bearing if you redraw it:
+
+- **It's a side view, drawn facing right.** The other poses are a
+  front-facing sit, which is fine standing still but slides like a chess
+  piece when moving. `PetWindow._oriented()` mirrors the frames (cached) when
+  he walks left, so only the right-facing version exists on disk.
+- **The cycle is advanced by distance travelled, not by the animation
+  timer** (`_WALK_PIXELS_PER_FRAME`, one frame per ~13px). That's what keeps
+  a planted paw tracking backwards at exactly the speed the window moves
+  forwards. Drive it off the clock and the feet skate whenever
+  `PET_WANDER_SPEED` doesn't happen to match `IDLE_ANIMATION_FPS`. If you
+  change the number of frames or the stride length in
+  `paw_position()`, retune that constant to match or he'll moonwalk.
+- **The frames carry their own vertical bob**, so the window's own bob is
+  switched off while they're in use. Only the no-walk-art fallback still
+  bobs in code.
+
+Delete `walk/` and everything still runs — he reverts to sliding with a small
+coded bob, which is what the pet did before the cycle existed.
+
 ## Swapping in different art

 Replace any state's PNGs (same alphabetical-order-loops convention) to
-change its look — no code changes needed. If your source is a single grid
-spritesheet (rows/cols of frames in one PNG) rather than one-file-per-frame,
-use `scripts/slice_spritesheet.py` to cut it into this folder-of-frames
+change its look — no code changes needed, and nothing forces you to keep
+using the generator. If your source is a single grid spritesheet (rows/cols
+of frames in one PNG) rather than one-file-per-frame, use
+`scripts/slice_spritesheet.py` to cut it into this folder-of-frames
 convention:

 ```bash
@@ -144,6 +144,30 @@ TTS_STREAMING = os.environ.get("TTS_STREAMING", "true").lower() in ("1", "true",

 SCREEN_CONTEXT = os.environ.get("SCREEN_CONTEXT", "true").lower() in ("1", "true", "yes", "on")

+# ── monitors ────────────────────────────────────────────────────────────────
+# A one-line note about the screen layout (how many, their sizes, which one
+# the pet is standing on) rides along with each utterance, so Bolt can decide
+# to `petctl jump` somewhere without asking you what you've got plugged in.
+# Cheap — the list comes from the UI, nothing is probed per turn.
+
+MONITOR_CONTEXT = os.environ.get("MONITOR_CONTEXT", "true").lower() in (
+    "1", "true", "yes", "on"
+)
+
+# ── screen text (OCR) ───────────────────────────────────────────────────────
+# Lets Bolt actually read a monitor, via `petctl read`. Pull-only: nothing is
+# captured unless the server asks for it, and every read is logged. Needs the
+# optional capture/OCR extras — see the comments in requirements.txt.
+#
+# This widens what can leave the machine more than any other switch here: the
+# recognised text of a whole screen goes to the server. It is *not* a new
+# capability (the shell relay could already run a screenshot tool and OCR it),
+# but it is a much easier one to use by accident. Set SCREEN_TEXT=false to
+# take it away entirely.
+
+SCREEN_TEXT = os.environ.get("SCREEN_TEXT", "true").lower() in ("1", "true", "yes", "on")
+SCREEN_TEXT_MAX_CHARS = int(os.environ.get("SCREEN_TEXT_MAX_CHARS", "4000"))
+
 # ── quiet hours / do-not-disturb ────────────────────────────────────────────
 # Comma-separated HH:MM-HH:MM ranges (wrapping midnight is fine). While
 # napping the pet dims, stops wandering, and makes no proactive noise —
@@ -20,8 +20,9 @@ from typing import Optional
 from PySide6.QtCore import QObject, Signal

 from . import (
-    config, file_delivery, file_ops, history as history_mod, notifications,
-    pet_actions, quiet, screen_context, server_client, speech_text, updater,
+    config, file_delivery, file_ops, history as history_mod,
+    monitors as monitors_mod, notifications, pet_actions, quiet,
+    screen_context, screen_text, server_client, speech_text, updater,
 )
 from .audio import barge_in, mic, stt, tts, wake_word
 from .state import PetState, PetStateMachine
@@ -53,6 +54,13 @@ class PetController(QObject):
        # window. Append-only from this thread; the UI only ever snapshots it.
        self.history = history_mod.ConversationHistory(limit=config.HISTORY_LIMIT)

+        # The screen layout, as published by the UI (see set_monitors). Held
+        # here rather than probed, so "monitor 2" means the same thing to the
+        # controller and to the window that has to jump there — see
+        # monitors.py for why that matters.
+        self._monitors: list[monitors_mod.Monitor] = []
+        self._pet_monitor: Optional[int] = None
+
        # Wake-word sensitivity is live-tunable (tray tuner), so it's read
        # through a callable on every frame rather than captured per listen.
        self._wake_threshold = config.WAKE_WORD_THRESHOLD
@@ -243,7 +251,7 @@ class PetController(QObject):
            # What's focused right now rides along, so "what's this error?"
            # has a referent without you having to describe the window.
            reply = server_client.converse(
-                screen_context.context_for(text), on_command=self._handle_command
+                self._with_context(text), on_command=self._handle_command
            )
        except server_client.ServerError as exc:
            self.log.emit(f"Server error: {exc}")
@@ -255,6 +263,31 @@ class PetController(QObject):
        self._speak(reply)
        self._state.transition(PetState.IDLE)

+    def _with_context(self, text: str) -> str:
+        """Everything the server gets alongside what you actually said: the
+        focused window title, and a one-line note about the screen layout so
+        Bolt knows how many monitors there are and where he's standing
+        without having to ask. Only the *layout* rides along for free — the
+        text on those screens costs an OCR pass, so it stays behind
+        `petctl read`."""
+        text = screen_context.context_for(text)
+        if config.MONITOR_CONTEXT:
+            text = monitors_mod.annotate(text, self._monitors, self._pet_monitor)
+        return text
+
+    # ── screen layout, published by the UI ───────────────────────────────
+
+    def set_monitors(self, monitors: list) -> None:
+        """Slot: the window telling us what screens exist (queued signal)."""
+        self._monitors = list(monitors)
+        self.log.emit(
+            "Screens: " + (monitors_mod.summary(self._monitors) or "none reported")
+        )
+
+    def set_pet_monitor(self, index: int) -> None:
+        """Slot: the window telling us which screen the pet is standing on."""
+        self._pet_monitor = int(index)
+
    def _handle_command(self, command: str) -> str:
        """Server-relayed command. `petctl ...` drives the pet's body and
        `filectl ...` does local file read/write/edit — neither ever reaches
@@ -267,7 +300,29 @@ class PetController(QObject):
            return f"[pet] {exc}"
        if action is not None:
            self.log.emit(f"Pet action: {action}")
-            if action["action"] == "nap":
+
+            # Queries answer from here rather than from pet_actions.describe():
+            # their output *is* the useful part, and it's what the server reads
+            # back off the tool-result relay.
+            kind = action["action"]
+            if kind == "monitors":
+                return monitors_mod.describe(self._monitors, self._pet_monitor)
+            if kind == "read":
+                return self._read_screen(action["target"])
+            if kind == "jump":
+                try:
+                    target = monitors_mod.resolve(
+                        self._monitors, action["target"], self._pet_monitor
+                    )
+                except ValueError as exc:
+                    self.log.emit(f"petctl jump: {exc}")
+                    return f"[pet] {exc}"
+                # Hand the window a resolved index, so it can't re-resolve the
+                # spec against a different screen ordering.
+                self.action.emit({"action": "jump", "monitor": target.index})
+                return f"[pet] jumped to monitor {target.label}"
+
+            if kind == "nap":
                self.set_napping(bool(action["enabled"]))
            self.action.emit(action)
            return pet_actions.describe(action)
@@ -287,6 +342,29 @@ class PetController(QObject):

        return server_client.run_local_command(command)

+    def _read_screen(self, target: str) -> str:
+        """`petctl read` — OCR a screen and hand the text back to the server."""
+        if not config.SCREEN_TEXT:
+            return "[pet] screen reading is disabled (set SCREEN_TEXT=true in .env)"
+        if not self._monitors:
+            return "[pet] no monitor information available"
+        limit = config.SCREEN_TEXT_MAX_CHARS
+        if target in ("all", "everything", "*"):
+            self.log.emit(f"Reading all {len(self._monitors)} screens…")
+            return screen_text.read_monitors(self._monitors, limit)
+        if target in ("here", "", "this", "current"):
+            index = self._pet_monitor if self._pet_monitor is not None else 0
+            monitor = self._monitors[min(index, len(self._monitors) - 1)]
+        else:
+            try:
+                monitor = monitors_mod.resolve(
+                    self._monitors, target, self._pet_monitor
+                )
+            except ValueError as exc:
+                return f"[pet] {exc}"
+        self.log.emit(f"Reading monitor {monitor.number} ({monitor.name})…")
+        return screen_text.read_monitor(monitor, limit)
+
    def _speak(self, text: str) -> None:
        self._state.transition(PetState.TALKING)
        # Bubble gets the markdown stripped but emoji kept (it can't render
@@ -0,0 +1,213 @@
+"""Which screens exist, and which one the pet is standing on.
+
+Deliberately free of Qt *and* of any subprocess probing: the monitor list is
+published by the UI (`ui/pet_window.py` builds it from
+`QGuiApplication.screens()`) and handed to the controller over a queued
+signal, the same way every other UI↔controller message travels.
+
+That indirection is the whole point. The pet has to agree with itself about
+what "monitor 2" means — if the controller enumerated screens with `xrandr`
+while the window jumped using Qt's screen list, the two orderings could
+disagree and Bolt would announce one screen and land on another. Making Qt the
+single source of truth removes that class of bug, and leaves everything here
+pure enough to unit test without a display.
+
+Indices are **1-based in every string a human or the model ever sees**, and
+0-based in the list itself. `Monitor.index` is the 0-based one; `.number` is
+what gets printed.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Iterable, Optional
+
+# Directional specs understood by resolve(), mapped to a (dx, dy) heading.
+_DIRECTIONS = {
+    "left": (-1, 0),
+    "right": (1, 0),
+    "up": (0, -1),
+    "above": (0, -1),
+    "down": (0, 1),
+    "below": (0, 1),
+}
+
+
+@dataclass(frozen=True)
+class Monitor:
+    """One screen, in the global desktop coordinate space."""
+
+    index: int  # 0-based position in the published list
+    name: str
+    x: int
+    y: int
+    width: int
+    height: int
+    primary: bool = False
+
+    @property
+    def number(self) -> int:
+        """1-based, for anything a person or the model reads."""
+        return self.index + 1
+
+    @property
+    def right(self) -> int:
+        return self.x + self.width
+
+    @property
+    def bottom(self) -> int:
+        return self.y + self.height
+
+    @property
+    def center(self) -> tuple[int, int]:
+        return self.x + self.width // 2, self.y + self.height // 2
+
+    def contains(self, x: int, y: int) -> bool:
+        return self.x <= x < self.right and self.y <= y < self.bottom
+
+    @property
+    def label(self) -> str:
+        bits = f"{self.number}: {self.name} {self.width}x{self.height}"
+        return bits + " (primary)" if self.primary else bits
+
+
+def monitor_containing(
+    monitors: Iterable[Monitor], x: int, y: int
+) -> Optional[Monitor]:
+    """The screen holding point (x, y), or None if it's off every screen."""
+    for monitor in monitors:
+        if monitor.contains(x, y):
+            return monitor
+    return None
+
+
+def nearest_monitor(monitors: Iterable[Monitor], x: int, y: int) -> Optional[Monitor]:
+    """Screen whose centre is closest to (x, y) — the fallback when a point
+    lands in the dead space between mismatched screens."""
+    monitors = list(monitors)
+    if not monitors:
+        return None
+    return min(
+        monitors,
+        key=lambda m: (m.center[0] - x) ** 2 + (m.center[1] - y) ** 2,
+    )
+
+
+def resolve(
+    monitors: list[Monitor], spec: str, current: Optional[int] = None
+) -> Monitor:
+    """Turn a `petctl jump` target into a screen.
+
+    Accepts a 1-based number, a name (case-insensitive substring, so "hdmi"
+    finds "HDMI-0"), `next`/`prev`, `primary`, `other`, or a direction
+    (`left`/`right`/`up`/`down`) relative to *current*. Raises ValueError with
+    a message meant to be read by the model, since it goes back as tool
+    output.
+    """
+    if not monitors:
+        raise ValueError("no monitors have been reported yet")
+    spec = (spec or "").strip().lower()
+    if not spec:
+        raise ValueError("jump needs a target monitor")
+    count = len(monitors)
+    if current is None or not (0 <= current < count):
+        current = next((m.index for m in monitors if m.primary), 0)
+
+    if spec.isdigit():
+        number = int(spec)
+        if not (1 <= number <= count):
+            raise ValueError(
+                f"there is no monitor {number}; you have {count} "
+                f"(1-{count})"
+            )
+        return monitors[number - 1]
+
+    if spec in ("next", "forward"):
+        return monitors[(current + 1) % count]
+    if spec in ("prev", "previous", "back"):
+        return monitors[(current - 1) % count]
+    if spec == "primary":
+        return next((m for m in monitors if m.primary), monitors[0])
+    if spec == "other":
+        # With two screens "the other one" is unambiguous; with more it's just
+        # the next one round, which is at least always a *different* screen.
+        return monitors[(current + 1) % count]
+    if spec == "random":
+        # Deterministic-free choice is the caller's business; pick the screen
+        # furthest from the current one so "random" always visibly moves.
+        here = monitors[current].center
+        return max(
+            monitors,
+            key=lambda m: (m.center[0] - here[0]) ** 2 + (m.center[1] - here[1]) ** 2,
+        )
+
+    if spec in _DIRECTIONS:
+        dx, dy = _DIRECTIONS[spec]
+        here = monitors[current].center
+        candidates = []
+        for monitor in monitors:
+            if monitor.index == current:
+                continue
+            ox, oy = monitor.center
+            along = (ox - here[0]) * dx + (oy - here[1]) * dy
+            if along <= 0:
+                continue  # not in that direction at all
+            drift = abs((ox - here[0]) * dy + (oy - here[1]) * dx)
+            candidates.append((drift, along, monitor))
+        if not candidates:
+            raise ValueError(
+                f"there's no monitor to the {spec} of monitor "
+                f"{monitors[current].number}"
+            )
+        # Prefer the best-aligned screen, then the closest of those.
+        candidates.sort(key=lambda item: (item[0], item[1]))
+        return candidates[0][2]
+
+    matches = [m for m in monitors if spec in m.name.lower()]
+    if len(matches) == 1:
+        return matches[0]
+    if len(matches) > 1:
+        raise ValueError(
+            f"{spec!r} matches several monitors: "
+            + ", ".join(m.label for m in matches)
+        )
+    raise ValueError(
+        f"unknown monitor {spec!r}; you have: "
+        + "; ".join(m.label for m in monitors)
+        + " — or use next/prev/primary/left/right/up/down"
+    )
+
+
+def describe(monitors: list[Monitor], current: Optional[int] = None) -> str:
+    """Full listing, used as `petctl monitors` output."""
+    if not monitors:
+        return "[pet] no monitor information available"
+    lines = [f"[pet] {len(monitors)} monitor(s):"]
+    for monitor in monitors:
+        here = " <- Bolt is here" if monitor.index == current else ""
+        lines.append(
+            f"  {monitor.label} at +{monitor.x}+{monitor.y}{here}"
+        )
+    return "\n".join(lines)
+
+
+def summary(monitors: list[Monitor], current: Optional[int] = None) -> Optional[str]:
+    """One-line version tacked onto each utterance — short on purpose, since
+    it rides along with every single thing you say."""
+    if not monitors:
+        return None
+    parts = ", ".join(f"{m.number}) {m.name} {m.width}x{m.height}" for m in monitors)
+    line = f"{len(monitors)} monitors: {parts}"
+    if current is not None and 0 <= current < len(monitors):
+        line += f"; Bolt is on {monitors[current].number}"
+    return line
+
+
+def annotate(text: str, monitors: list[Monitor], current: Optional[int] = None) -> str:
+    """Attach the screen summary as a separate aside, matching the style of
+    screen_context.annotate() so the model can ignore it when irrelevant."""
+    text = (text or "").strip()
+    line = summary(monitors, current)
+    if not text or not line:
+        return text
+    return f"{text}\n\n[{line}]"
@@ -29,8 +29,18 @@ ANCHORS = (

 EMOTES = ("wave", "hop", "spin", "nod", "shake", "bounce", "wiggle")

+# Where `petctl jump` can be aimed. A bare number (1-based) works too, as does
+# any unique part of a monitor's name — resolution lives in monitors.resolve().
+MONITOR_SPECS = (
+    "next", "prev", "primary", "other", "random",
+    "left", "right", "up", "down",
+)
+
 HELP = (
    "petctl move <x> <y> | <" + "|".join(ANCHORS) + ">\n"
+    "petctl jump <monitor number|" + "|".join(MONITOR_SPECS) + "|name>\n"
+    "petctl monitors\n"
+    "petctl read [monitor number|here|all]\n"
    "petctl emote <" + "|".join(EMOTES) + ">\n"
    "petctl say <text>\n"
    "petctl wander on|off\n"
@@ -82,6 +92,24 @@ def parse(command: str) -> Optional[dict]:
            raise ActionError(f"unknown position {args[0]!r}; try one of: " + ", ".join(ANCHORS))
        return {"action": "move", "anchor": anchor}

+    if verb in ("jump", "monitor", "screen"):
+        if not args:
+            raise ActionError(
+                "jump needs a monitor: a number, a name, or one of "
+                + ", ".join(MONITOR_SPECS)
+            )
+        # The spec isn't validated here on purpose: which monitors exist is a
+        # runtime fact this pure module doesn't have. monitors.resolve() does
+        # it once the published screen list is in hand.
+        return {"action": "jump", "target": " ".join(args).strip()}
+
+    if verb in ("monitors", "screens", "displays"):
+        return {"action": "monitors"}
+
+    if verb in ("read", "look", "ocr", "see"):
+        target = (" ".join(args).strip() or "here").lower()
+        return {"action": "read", "target": target}
+
    if verb in ("emote", "do"):
        if not args:
            raise ActionError("emote needs a name: " + ", ".join(EMOTES))
@@ -124,6 +152,8 @@ def describe(action: dict) -> str:
    if kind == "move":
        where = action.get("anchor") or f"({action.get('x')}, {action.get('y')})"
        return f"[pet] walking to {where}"
+    if kind == "jump":
+        return f"[pet] jumping to monitor {action['target']}"
    if kind == "emote":
        return f"[pet] {action['emote']}"
    if kind == "say":
@@ -0,0 +1,187 @@
+"""Reading the text that's actually on a monitor, via screenshot + OCR.
+
+This is the "Bolt can see what's on screen" half of the screen features. It is
+**pull, not push**: nothing here runs on its own. The server has to ask, by
+relaying `petctl read`, and the recognised text goes back as that command's
+output through the existing tool-result relay (see server_client.converse).
+That's deliberate on two counts — OCR of a 4K screen costs a second or two,
+which would be tacked onto every single utterance if it ran automatically, and
+"screen contents leave this machine" should be a thing Bolt decides to do and
+you can see in the log, not a silent constant.
+
+Both halves are optional and soft-fail with a reason, the way hotkey.py does:
+capture needs `mss`, recognition needs a Tesseract or RapidOCR install. With
+neither, `petctl read` reports what's missing instead of raising, and the rest
+of the pet carries on.
+
+The pure parts (cleaning OCR output, formatting the reply, deciding which
+engine to use given what's installed) are split out and unit tested; only
+capture and the OCR call itself need a real screen.
+"""
+
+from __future__ import annotations
+
+import re
+import shutil
+from typing import Callable, Optional
+
+from .monitors import Monitor
+
+DEFAULT_MAX_CHARS = 4000
+
+INSTALL_HINT = (
+    "install one of: `pip install mss pytesseract` + `sudo apt install "
+    "tesseract-ocr` (fastest), or `pip install mss rapidocr-onnxruntime` "
+    "(no system package needed)"
+)
+
+# Lines that are almost certainly OCR noise rather than text: window chrome
+# fragments, isolated punctuation, single stray characters.
+_MIN_MEANINGFUL = 2
+
+
+def _module_available(name: str) -> bool:
+    import importlib.util
+
+    try:
+        return importlib.util.find_spec(name) is not None
+    except (ImportError, ValueError):
+        return False
+
+
+# ── pure helpers (unit tested; no screen, no OCR engine needed) ──────────────
+
+def resolve_engine(
+    has_module: Callable[[str], bool] = _module_available,
+    which: Callable[[str], Optional[str]] = shutil.which,
+) -> tuple[Optional[str], str]:
+    """Pick an OCR engine from what's installed.
+
+    Returns `(engine, reason)`. *engine* is None when nothing usable is
+    present, and *reason* then explains what to install. Probes are injected
+    so this is testable on a machine with a different set of things installed.
+    """
+    if has_module("pytesseract") and which("tesseract"):
+        return "pytesseract", ""
+    if has_module("rapidocr_onnxruntime"):
+        return "rapidocr", ""
+    if has_module("pytesseract") and not which("tesseract"):
+        return None, (
+            "pytesseract is installed but the tesseract binary isn't on PATH "
+            "(try: sudo apt install tesseract-ocr)"
+        )
+    return None, f"no OCR engine available — {INSTALL_HINT}"
+
+
+def capture_available(has_module: Callable[[str], bool] = _module_available) -> bool:
+    return has_module("mss")
+
+
+def clean_ocr_text(raw: str, max_chars: int = DEFAULT_MAX_CHARS) -> str:
+    """Squeeze raw OCR output into something worth sending.
+
+    Screen OCR produces a lot of junk — single stray glyphs off window
+    borders, runs of blank lines, the same toolbar label recognised twice. All
+    of that costs tokens and tells the model nothing, so it goes.
+    """
+    if not raw:
+        return ""
+    lines: list[str] = []
+    for line in raw.splitlines():
+        line = re.sub(r"[^\S\n]+", " ", line).strip()
+        if not line:
+            continue
+        if len(re.sub(r"[^0-9A-Za-z]", "", line)) < _MIN_MEANINGFUL:
+            continue
+        if lines and line == lines[-1]:
+            continue  # consecutive duplicate
+        lines.append(line)
+    text = "\n".join(lines)
+    if max_chars and len(text) > max_chars:
+        text = text[: max_chars - 1].rstrip() + "…"
+        text += "\n[truncated]"
+    return text
+
+
+def format_reading(monitor: Optional[Monitor], text: str) -> str:
+    """The tool output handed back for `petctl read`."""
+    where = f"monitor {monitor.number} ({monitor.name})" if monitor else "screen"
+    if not text.strip():
+        return f"[pet] read {where}: no text recognised"
+    return f"[pet] text on {where}:\n{text}"
+
+
+# ── capture + recognition (needs a real screen) ──────────────────────────────
+
+def capture(monitor: Monitor):
+    """Grab *monitor* as a PIL image, or None if capture isn't available."""
+    try:
+        import mss
+        from PIL import Image
+    except ImportError:
+        return None
+    try:
+        box = {
+            "left": monitor.x,
+            "top": monitor.y,
+            "width": monitor.width,
+            "height": monitor.height,
+        }
+        with mss.mss() as sct:
+            shot = sct.grab(box)
+        return Image.frombytes("RGB", shot.size, shot.bgra, "raw", "BGRX")
+    except Exception:
+        return None
+
+
+def _ocr(image, engine: str) -> str:
+    if engine == "pytesseract":
+        import pytesseract
+
+        # Grayscale first: tesseract is measurably better on it than on the
+        # colour desktop, and it's a cheap conversion.
+        return pytesseract.image_to_string(image.convert("L"))
+    if engine == "rapidocr":
+        import numpy as np
+        from rapidocr_onnxruntime import RapidOCR
+
+        result, _ = RapidOCR()(np.array(image))
+        if not result:
+            return ""
+        return "\n".join(line[1] for line in result)
+    return ""
+
+
+def read_monitor(monitor: Monitor, max_chars: int = DEFAULT_MAX_CHARS) -> str:
+    """OCR one screen and return the formatted tool output.
+
+    Never raises: every failure path returns a sentence explaining itself,
+    because the return value goes straight back to the server as the result of
+    a command Bolt chose to run.
+    """
+    if not capture_available():
+        return f"[pet] can't capture the screen — {INSTALL_HINT}"
+    engine, reason = resolve_engine()
+    if engine is None:
+        return f"[pet] can't read the screen — {reason}"
+    image = capture(monitor)
+    if image is None:
+        return (
+            f"[pet] couldn't capture monitor {monitor.number} "
+            "(is this a Wayland session? mss needs X11)"
+        )
+    try:
+        raw = _ocr(image, engine)
+    except Exception as exc:
+        return f"[pet] OCR failed on monitor {monitor.number}: {exc}"
+    return format_reading(monitor, clean_ocr_text(raw, max_chars))
+
+
+def read_monitors(monitors: list[Monitor], max_chars: int = DEFAULT_MAX_CHARS) -> str:
+    """OCR several screens, splitting the character budget between them."""
+    if not monitors:
+        return "[pet] no monitor information available"
+    if len(monitors) == 1:
+        return read_monitor(monitors[0], max_chars)
+    share = max(400, max_chars // len(monitors))
+    return "\n\n".join(read_monitor(m, share) for m in monitors)
@@ -46,6 +46,13 @@ def run() -> int:
    controller.finished.connect(thread.quit)

    window.talk_requested.connect(controller.request_talk_now)
+    # The window owns the screen list and tells the controller about it, so
+    # both ends agree on what "monitor 2" means (see monitors.py).
+    window.monitors_changed.connect(controller.set_monitors)
+    window.pet_monitor_changed.connect(controller.set_pet_monitor)
+    # PetWindow publishes once in its constructor, which ran before those
+    # connections existed — so say it again now that anyone is listening.
+    window.publish_monitors()
    window.copied.connect(lambda text: _log(f"Copied to clipboard: {text[:60]}"))

    history_window = HistoryWindow(controller.history)
@@ -20,8 +20,9 @@ from PySide6.QtGui import (
 from PySide6.QtWidgets import QApplication, QWidget

 from .. import config
+from ..monitors import Monitor
 from ..state import PetState
-from .sprite import SpriteSet
+from .sprite import WALK, SpriteSet

 _DRAG_THRESHOLD_PX = 4
 # Movement runs on its own ~30fps timer, independent of the (slower) sprite
@@ -29,6 +30,12 @@ _DRAG_THRESHOLD_PX = 4
 _WANDER_TICK_MS = 33
 _EMOTE_TICKS = 36  # ~1.2s per emote at the tick rate above
 _NAP_OPACITY = 0.35
+# How far the pet travels per walk-cycle frame. The cycle is advanced by
+# distance rather than by the animation clock so a planted paw tracks backwards
+# at exactly the speed the window moves forwards — drive it off a timer instead
+# and the feet skate whenever PET_WANDER_SPEED doesn't happen to match the fps.
+# Eight frames at 13px is a ~104px stride cycle, a bit under the pet's width.
+_WALK_PIXELS_PER_FRAME = 13.0


 def emote_transform(emote: str, progress: float) -> tuple[float, float, float, float]:
@@ -164,6 +171,12 @@ class SpeechBubble(QWidget):
 class PetWindow(QWidget):
    talk_requested = Signal()
    copied = Signal(str)  # bubble text the user just put on the clipboard
+    # The screen layout, published *to* the controller (queued, cross-thread).
+    # The window is the only thing allowed to ask Qt about screens, so the
+    # controller and the window can never disagree about what "monitor 2"
+    # means — see monitors.py.
+    monitors_changed = Signal(list)  # list[monitors.Monitor]
+    pet_monitor_changed = Signal(int)  # 0-based index the pet is standing on

    def __init__(self, sprite_dir: Optional[Path] = None, size: Optional[int] = None):
        super().__init__()
@@ -201,6 +214,10 @@ class PetWindow(QWidget):
        self._next_wander_at = 0.0
        self._bob_offset = 0
        self._bob_phase = 0.0
+        self._walking = False
+        self._facing = 1  # +1 right, -1 left; the walk art is drawn facing right
+        self._walk_distance = 0.0
+        self._mirror_cache: dict[int, QPixmap] = {}
        self._schedule_next_wander()
        self._wander_timer = QTimer(self)
        self._wander_timer.timeout.connect(self._movement_tick)
@@ -210,6 +227,18 @@ class PetWindow(QWidget):
        self.set_click_through(config.PET_CLICK_THROUGH)
        self._place_start_position()

+        self._monitors: list[Monitor] = []
+        self._pet_monitor: Optional[int] = None
+        self._last_published_pos: Optional[QPoint] = None
+        app = QApplication.instance()
+        if app is not None:
+            # Screens come and go — a laptop docking, a TV waking up. Republish
+            # rather than letting Bolt jump to a monitor that's been unplugged.
+            app.screenAdded.connect(lambda _s: self.publish_monitors())
+            app.screenRemoved.connect(lambda _s: self.publish_monitors())
+            app.primaryScreenChanged.connect(lambda _s: self.publish_monitors())
+        self.publish_monitors()
+
    # ── placement ────────────────────────────────────────────────────────

    def _place_start_position(self) -> None:
@@ -244,6 +273,8 @@ class PetWindow(QWidget):
            if target is not None:
                self._wander_target = target
                self._commanded_move = True  # overrides the idle-only rule
+        elif kind == "jump":
+            self.jump_to_monitor(int(action["monitor"]))
        elif kind == "emote":
            self.start_emote(action["emote"])
        elif kind == "say":
@@ -378,6 +409,98 @@ class PetWindow(QWidget):
        """Stroll immediately (tray menu / anything that wants a nudge)."""
        self._next_wander_at = 0.0

+    # ── monitors ─────────────────────────────────────────────────────────
+
+    def _build_monitors(self) -> list[Monitor]:
+        """Snapshot Qt's screen list as plain dataclasses.
+
+        Full `geometry()`, not `availableGeometry()`: these coordinates are
+        what a screen grab gets cropped to, and a grab doesn't stop at the
+        taskbar. Placement uses availableGeometry separately.
+        """
+        primary = QApplication.primaryScreen()
+        out = []
+        for index, screen in enumerate(QApplication.screens()):
+            geo = screen.geometry()
+            out.append(
+                Monitor(
+                    index=index,
+                    name=screen.name() or f"screen-{index + 1}",
+                    x=geo.x(),
+                    y=geo.y(),
+                    width=geo.width(),
+                    height=geo.height(),
+                    primary=screen is primary,
+                )
+            )
+        return out
+
+    def publish_monitors(self, force: bool = True) -> None:
+        """Push the current layout to whoever's listening (the controller).
+
+        *force* re-emits even when nothing changed, which is what the initial
+        wiring in ui/app.py needs: this window is built before the controller
+        exists, so the constructor's first publish goes to nobody.
+        """
+        monitors = self._build_monitors()
+        changed = monitors != self._monitors
+        self._monitors = monitors
+        if changed or force:
+            self.monitors_changed.emit(monitors)
+        self._publish_pet_monitor(force=True)
+
+    def monitors(self) -> list[Monitor]:
+        return list(self._monitors)
+
+    def current_monitor_index(self) -> Optional[int]:
+        center = self.frameGeometry().center()
+        screens = QApplication.screens()
+        if not screens:
+            return None
+        screen = QApplication.screenAt(center)
+        if screen is not None:
+            try:
+                return screens.index(screen)
+            except ValueError:
+                pass
+        # Straddling a gap or dragged off the desktop entirely — fall back to
+        # whichever screen centre is nearest rather than reporting nothing.
+        best = min(
+            range(len(screens)),
+            key=lambda i: (screens[i].geometry().center() - center).manhattanLength(),
+        )
+        return best
+
+    def _publish_pet_monitor(self, force: bool = False) -> None:
+        index = self.current_monitor_index()
+        if index is None:
+            return
+        if force or index != self._pet_monitor:
+            self._pet_monitor = index
+            self.pet_monitor_changed.emit(index)
+
+    def jump_to_monitor(self, index: int) -> None:
+        """Teleport to *index* (0-based, resolved by the controller) and land
+        with a hop. Instant rather than a stroll — Bolt asked to *jump*, and
+        walking between screens would take the long way across the desktop."""
+        screens = QApplication.screens()
+        if not (0 <= index < len(screens)):
+            return
+        geo = screens[index].availableGeometry()
+        point = self._clamp_to_screen(
+            QPoint(
+                geo.left() + (geo.width() - self.width()) // 2,
+                geo.top() + (geo.height() - self.height()) // 2,
+            ),
+            geo,
+        )
+        self._stop_walking()  # drop any stroll in flight, or it walks straight back
+        self.move(point)
+        self._schedule_next_wander()
+        self._publish_pet_monitor(force=True)
+        self.start_emote("hop")
+        self.update()
+
    def _screen_geometry(self):
        # screenAt() so a multi-monitor setup keeps the pet on the screen
        # it's currently standing on rather than yanking it to the primary.
@@ -389,12 +512,17 @@ class PetWindow(QWidget):
        self._next_wander_at = time.monotonic() + random.uniform(0.5 * base, 1.5 * base)

    def _stop_walking(self) -> None:
-        if self._wander_target is None and not self._bob_offset:
+        if self._wander_target is None and not self._bob_offset and not self._walking:
            return
        self._wander_target = None
        self._commanded_move = False
        self._bob_phase = 0.0
        self._bob_offset = 0
+        self._walking = False
+        self._walk_distance = 0.0
+        # Back to a standing frame, so the next stroll starts from a contact
+        # pose instead of mid-stride.
+        self.sprites.get(WALK).reset()
        self.update()

    def snap_to_edge(self) -> bool:
@@ -447,6 +575,13 @@ class PetWindow(QWidget):
        wandering only happens when it's otherwise unoccupied."""
        self._advance_emote()
        self._wander_tick()
+        # Report crossing a screen boundary — by strolling, by being dragged,
+        # by anything. Guarded on the position actually changing so the common
+        # case (a stationary pet, 30x a second) costs one comparison.
+        position = self.pos()
+        if position != self._last_published_pos:
+            self._last_published_pos = position
+            self._publish_pet_monitor()

    def _wander_tick(self) -> None:
        # Only stroll while genuinely idle: not mid-drag, not napping, not
@@ -484,11 +619,51 @@ class PetWindow(QWidget):
            self.snap_to_edge()
        else:
            self.move(round(here.x() + dx / distance * step), round(here.y() + dy / distance * step))
-            self._bob_phase += 0.45  # little walk-cycle hop
-            self._bob_offset = int(round(-2.5 * abs(math.sin(self._bob_phase))))
+            self._advance_walk(dx, dy, step)
            self.update()
        self._reposition_bubble()

+    def _advance_walk(self, dx: float, dy: float, step: float) -> None:
+        """Drive the walk cycle from distance travelled (see the constant).
+
+        Falls back to the old bob-in-code if there's no walk art, so a sprite
+        folder without a walk/ directory still looks like it's moving rather
+        than sliding perfectly flat.
+        """
+        self._walking = True
+        # Only turn on meaningful horizontal travel: a near-vertical stroll
+        # would otherwise flip him back and forth on rounding noise.
+        if abs(dx) > 1.0:
+            self._facing = 1 if dx > 0 else -1
+        if not self.sprites.has(WALK):
+            self._bob_phase += 0.45
+            self._bob_offset = int(round(-2.5 * abs(math.sin(self._bob_phase))))
+            return
+        self._bob_offset = 0  # the walk frames carry their own weight shift
+        self._walk_distance += step
+        while self._walk_distance >= _WALK_PIXELS_PER_FRAME:
+            self._walk_distance -= _WALK_PIXELS_PER_FRAME
+            self.sprites.get(WALK).advance()
+
+    def _animation_key(self):
+        """Walking overrides the state animation — but only while genuinely
+        idle-and-moving, so he doesn't trot on the spot mid-sentence."""
+        if self._walking and self.sprites.has(WALK):
+            return WALK
+        return self._current_state
+
+    def _oriented(self, pixmap: Optional[QPixmap]) -> Optional[QPixmap]:
+        """Mirror the (right-facing) walk art when he's heading left. Cached
+        per source frame — flipping on every paint would be wasteful at 30fps."""
+        if pixmap is None or self._facing >= 0:
+            return pixmap
+        key = pixmap.cacheKey()
+        mirrored = self._mirror_cache.get(key)
+        if mirrored is None:
+            mirrored = pixmap.transformed(QTransform().scale(-1, 1), Qt.SmoothTransformation)
+            self._mirror_cache[key] = mirrored
+        return mirrored
+
    # ── state / speech ──────────────────────────────────────────────────

    def set_state(self, state: PetState) -> None:
@@ -514,6 +689,11 @@ class PetWindow(QWidget):
    # ── animation ────────────────────────────────────────────────────────

    def _advance_frame(self) -> None:
+        # While walking the cycle is stepped by _advance_walk from distance
+        # travelled; letting this timer also advance it would double-step it
+        # and put the feet out of sync with the movement.
+        if self._walking and self.sprites.has(WALK):
+            return
        self.sprites.get(self._current_state).advance()
        self.update()

@@ -521,7 +701,10 @@ class PetWindow(QWidget):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing)
        painter.setRenderHint(QPainter.SmoothPixmapTransform)
-        pixmap: Optional[QPixmap] = self.sprites.get(self._current_state).current()
+        key = self._animation_key()
+        pixmap: Optional[QPixmap] = self.sprites.get(key).current()
+        if key == WALK:
+            pixmap = self._oriented(pixmap)
        if pixmap is None:
            self._apply_input_mask(None, 0, 0)
            return
@@ -95,17 +95,46 @@ def _load_frames_from_dir(directory: Path, size: int) -> list[QPixmap]:
    return frames


+WALK = "walk"
+
+# Animations that aren't pipeline states. Walking is a property of *movement*,
+# orthogonal to whether the pet is idle/listening/talking, so it deliberately
+# isn't a PetState — state.py stays a description of the conversation, not of
+# the body. Loaded the same way, keyed by name.
+EXTRA_ANIMATIONS = (WALK,)
+
+
 class SpriteSet:
-    """All animations for every PetState, loaded from *sprite_dir*."""
+    """All animations for every PetState, plus the extras, from *sprite_dir*."""

    def __init__(self, sprite_dir: Path = DEFAULT_SPRITE_DIR, size: int = 160):
        self.size = size
-        self._animations: dict[PetState, SpriteAnimation] = {}
+        self._animations: dict[str, SpriteAnimation] = {}
+        self._loaded: set[str] = set()  # keys backed by real art, not placeholders
        for state in PetState:
            frames = _load_frames_from_dir(sprite_dir / state.value, size)
-            if not frames:
+            if frames:
+                self._loaded.add(state.value)
+            else:
                frames = _placeholder_frames(state, size)
-            self._animations[state] = SpriteAnimation(frames)
+            self._animations[state.value] = SpriteAnimation(frames)
+        for name in EXTRA_ANIMATIONS:
+            frames = _load_frames_from_dir(sprite_dir / name, size)
+            if frames:
+                self._loaded.add(name)
+                self._animations[name] = SpriteAnimation(frames)

-    def get(self, state: PetState) -> SpriteAnimation:
-        return self._animations[state]
+    @staticmethod
+    def _key(key) -> str:
+        return key.value if isinstance(key, PetState) else str(key)
+
+    def get(self, key) -> SpriteAnimation:
+        """Animation for a PetState or an extra name. Unknown/absent extras
+        fall back to idle, so a sprite folder with no walk/ still runs."""
+        return self._animations.get(self._key(key)) or self._animations[PetState.IDLE.value]
+
+    def has(self, key) -> bool:
+        """True only when real frames were found — the caller uses this to
+        decide whether to use an extra animation at all, rather than being
+        handed a placeholder blob that looks nothing like walking."""
+        return self._key(key) in self._loaded
@@ -32,6 +32,18 @@ pynput>=1.7
 # Not imported by the app itself.
 Pillow>=10.0

+# Screen reading (`petctl read`) — Bolt OCRs a monitor and uses the text in
+# his reply. Both optional: without them `petctl read` reports what's missing
+# and the rest of the pet is unaffected.
+#   mss         screen capture. X11/Win32/macOS — NOT Wayland.
+#   pytesseract a thin wrapper; the actual engine is a system package:
+#                   sudo apt install tesseract-ocr
+# No-sudo alternative to those two lines: pip install rapidocr-onnxruntime
+# (pure pip, reuses the onnxruntime openwakeword already pulls in, slower to
+# start). screen_text.resolve_engine() picks whichever is present.
+mss>=9.0
+pytesseract>=0.3.10
+
 # Test runner (tests/ — pure logic, no audio hardware or display needed;
 # run with QT_QPA_PLATFORM=offscreen).
 pytest>=8.0
@@ -0,0 +1,779 @@
+"""Draw Bolt — the pet — as per-state PNG frame sequences.
+
+Produces the `assets/sprites/<state>/frame_NN.png` convention that
+`bolt_pet/ui/sprite.py` loads (see `assets/sprites/README.md`). The art is
+generated rather than sourced so it stays editable: tweak a colour or a pose
+parameter here and re-run, instead of hand-editing 24 PNGs.
+
+    python scripts/generate_bolt_sprites.py                 # write into the real asset dir
+    python scripts/generate_bolt_sprites.py --out /tmp/prev # preview somewhere else
+
+Everything is drawn in normalised 0..1 coordinates on a square canvas and
+super-sampled `SS`x before being downscaled, because PIL's draw primitives
+have no antialiasing of their own.
+"""
+
+from __future__ import annotations
+
+import argparse
+import math
+from pathlib import Path
+
+from PIL import Image, ImageDraw
+
+SS = 4  # supersampling factor
+OUT = 320  # final frame size (2x the default PET_SIZE of 160)
+S = OUT * SS
+
+# --- palette ---------------------------------------------------------------
+# A cream shepherd-ish pup with a slate cap, amber eyes and a lightning blaze.
+C_OUTLINE = (34, 42, 58, 255)
+C_FUR = (246, 244, 238, 255)
+C_FUR_SHADE = (214, 210, 200, 255)
+C_DARK = (78, 92, 122, 255)
+C_DARK2 = (58, 70, 96, 255)
+C_INNER_EAR = (226, 154, 158, 255)
+C_BROW = (206, 166, 118, 255)
+# The far side of the walking pose. Distinctly darker than C_FUR_SHADE, which
+# is too close to the cream to read as "behind the dog" at 160px.
+C_FUR_FAR = (168, 176, 192, 255)
+C_NOSE = (40, 48, 66, 255)
+C_IRIS = (196, 128, 50, 255)
+C_PUPIL = (30, 36, 50, 255)
+C_WHITE = (255, 255, 255, 255)
+C_BOLT = (255, 206, 61, 255)
+C_COLLAR = (222, 84, 46, 255)
+C_TAG = (255, 198, 68, 255)
+C_TONGUE = (230, 116, 128, 255)
+C_GLOW = (92, 214, 244, 255)
+
+# --- layout constants (normalised) -----------------------------------------
+HEAD_CX, HEAD_CY = 0.50, 0.375
+HEAD_W, HEAD_H = 0.50, 0.44
+NECK_Y = 0.565  # head layer rotates about here so tilts pivot at the neck
+EAR_PIVOT = 0.335, 0.275
+
+OW = 0.0105  # outline width, normalised
+
+
+def px(v: float) -> float:
+    return v * S
+
+
+def _w(width: float) -> int:
+    return max(1, int(round(px(width))))
+
+
+def ell(d, cx, cy, w, h, fill, outline=C_OUTLINE, ow=OW):
+    d.ellipse(
+        [px(cx - w / 2), px(cy - h / 2), px(cx + w / 2), px(cy + h / 2)],
+        fill=fill,
+        outline=outline,
+        width=_w(ow) if outline else 0,
+    )
+
+
+def rrect(d, cx, cy, w, h, r, fill, outline=C_OUTLINE, ow=OW):
+    d.rounded_rectangle(
+        [px(cx - w / 2), px(cy - h / 2), px(cx + w / 2), px(cy + h / 2)],
+        radius=px(r),
+        fill=fill,
+        outline=outline,
+        width=_w(ow) if outline else 0,
+    )
+
+
+def poly(d, pts, fill, outline=C_OUTLINE, ow=OW):
+    d.polygon(
+        [(px(x), px(y)) for x, y in pts],
+        fill=fill,
+        outline=outline,
+        width=_w(ow) if outline else 0,
+    )
+
+
+def rotate_pts(pts, pivot, deg):
+    a = math.radians(deg)
+    ca, sa = math.cos(a), math.sin(a)
+    ox, oy = pivot
+    out = []
+    for x, y in pts:
+        dx, dy = x - ox, y - oy
+        out.append((ox + dx * ca - dy * sa, oy + dx * sa + dy * ca))
+    return out
+
+
+def lerp(a, b, t):
+    return a + (b - a) * t
+
+
+def bolt_shape(cx, cy, w, h):
+    """A lightning bolt polygon in a (w x h) box centred on (cx, cy)."""
+    unit = [
+        (0.62, 0.00),
+        (0.10, 0.56),
+        (0.44, 0.56),
+        (0.28, 1.00),
+        (0.90, 0.40),
+        (0.55, 0.40),
+        (0.80, 0.00),
+    ]
+    return [(cx + (u - 0.5) * w, cy + (v - 0.5) * h) for u, v in unit]
+
+
+# --- body ------------------------------------------------------------------
+def _tail_points(p, steps=26):
+    """Quadratic-bezier spine of the tail as (x, y, radius) samples.
+
+    Shared by the fill and outline passes so a wag can't move one and not the
+    other. The base sits deep inside the haunch, which is drawn over it, so
+    the tail reads as growing out of the body rather than floating beside it.
+    """
+    wag = p["tail"]
+    base = (0.620, 0.845)
+    ctrl = (0.955, 0.870 - 0.025 * wag)
+    end = (0.905, 0.605 - 0.065 * wag)
+    pts = []
+    for i in range(steps + 1):
+        t = i / steps
+        x = (1 - t) ** 2 * base[0] + 2 * (1 - t) * t * ctrl[0] + t**2 * end[0]
+        y = (1 - t) ** 2 * base[1] + 2 * (1 - t) * t * ctrl[1] + t**2 * end[1]
+        pts.append((x, y, lerp(0.080, 0.042, t)))
+    return pts
+
+
+def draw_tapered(d, pts, color_at):
+    """Draw a tapered limb from (x, y, radius) samples.
+
+    Two passes: circles along the spine for the fill, then the two silhouette
+    edges, so it reads as one solid shape instead of a string of beads.
+    *color_at* takes 0..1 along the length, which is how the tail gets its
+    cream tip.
+    """
+    last = len(pts) - 1
+    for i, (x, y, r) in enumerate(pts):
+        ell(d, x, y, r * 2, r * 2, color_at(i / last), outline=None)
+    for side in (1, -1):
+        edge = []
+        for i, (x, y, r) in enumerate(pts):
+            j = min(i + 1, last)
+            k = max(i - 1, 0)
+            tx, ty = pts[j][0] - pts[k][0], pts[j][1] - pts[k][1]
+            n = math.hypot(tx, ty) or 1e-6
+            nx, ny = -ty / n, tx / n
+            edge.append((x + nx * r * side, y + ny * r * side))
+        d.line([(px(x), px(y)) for x, y in edge], fill=C_OUTLINE, width=_w(OW), joint="curve")
+    x, y, r = pts[last]
+    ell(d, x, y, r * 2, r * 2, color_at(1.0))
+
+
+def draw_tail(d, p):
+    # Only the last stretch is the cream tip. The haunch hides the first ~half
+    # of the tail, so a generous tip leaves the visible part looking like a
+    # pale blob floating next to the dog rather than its tail.
+    draw_tapered(d, _tail_points(p), lambda t: C_DARK if t < 0.84 else C_FUR)
+
+
+def draw_body(d, p):
+    br = p["breathe"]
+    # haunches (sitting)
+    ell(d, 0.285, 0.795, 0.235, 0.275, C_DARK)
+    ell(d, 0.715, 0.795, 0.235, 0.275, C_DARK)
+    # torso
+    ell(d, 0.50, 0.745 - 0.004 * br, 0.455 + 0.012 * br, 0.395 + 0.014 * br, C_DARK)
+    # front legs
+    for cx in (0.415, 0.585):
+        rrect(d, cx, 0.845, 0.125, 0.215, 0.062, C_FUR)
+        ell(d, cx, 0.925, 0.155, 0.095, C_FUR)
+    # chest / belly blaze
+    ell(d, 0.50, 0.735 - 0.004 * br, 0.275 + 0.008 * br, 0.315 + 0.012 * br, C_FUR)
+    # toes
+    for cx in (0.415, 0.585):
+        for off in (-0.035, 0.0, 0.035):
+            d.arc(
+                [px(cx + off - 0.017), px(0.902), px(cx + off + 0.017), px(0.945)],
+                start=250,
+                end=290,
+                fill=C_FUR_SHADE,
+                width=_w(0.007),
+            )
+
+
+def draw_collar(d, p):
+    rrect(d, 0.50, 0.585, 0.315, 0.062, 0.031, C_COLLAR)
+    tag = C_GLOW if p.get("tag_glow") else C_TAG
+    ell(d, 0.50, 0.638, 0.082, 0.082, tag)
+    poly(d, bolt_shape(0.50, 0.638, 0.030, 0.052), C_OUTLINE, outline=None)
+
+
+# --- head ------------------------------------------------------------------
+# Ear outline in a *local* frame: origin at the base on the skull, +x points
+# outward (away from the muzzle), +y points up. Keeping it side-agnostic here
+# and mirroring at draw time avoids sign confusion — an earlier version mixed
+# the conventions and the ears flattened into a brim whenever they rotated.
+_EAR_LOCAL = [
+    (-0.058, -0.038),
+    (0.078, -0.038),
+    (0.092, 0.140),
+    (0.030, 0.248),
+    (-0.038, 0.122),
+]
+
+
+def _ear_polygon(side, lean_deg):
+    """Mirror + lean the local ear, returning canvas-space points.
+
+    *lean_deg* tips the ear away from vertical: 0 is fully perked, larger
+    values relax and eventually droop it out sideways.
+    """
+    a = math.radians(lean_deg)
+    ca, sa = math.cos(a), math.sin(a)
+    pivot_x = 0.5 + side * (0.5 - EAR_PIVOT[0])
+    pts = []
+    for x, y in _EAR_LOCAL:
+        rx = x * ca + y * sa
+        ry = -x * sa + y * ca
+        pts.append((pivot_x + side * rx, EAR_PIVOT[1] - ry))
+    return pts
+
+
+def draw_ears(d, p):
+    perk = p["ear"]
+    twitch = p.get("ear_twitch", 0.0)
+    for side in (-1, 1):
+        lean = 18.0 * (1.0 - perk) + 44.0 * max(0.0, -perk)
+        if side == 1:
+            lean -= twitch * 12.0
+        pts = _ear_polygon(side, lean)
+        poly(d, pts, C_DARK)
+        base_mid = (
+            (pts[0][0] + pts[1][0]) / 2,
+            (pts[0][1] + pts[1][1]) / 2,
+        )
+        inner = [(lerp(base_mid[0], x, 0.60), lerp(base_mid[1], y, 0.64)) for x, y in pts]
+        poly(d, inner, C_INNER_EAR, outline=None)
+
+
+def draw_cap(layer, p):
+    """Slate cap over the top of the head, clipped to the head silhouette."""
+    mask = Image.new("L", (S, S), 0)
+    ImageDraw.Draw(mask).ellipse(
+        [
+            px(HEAD_CX - HEAD_W / 2),
+            px(HEAD_CY - HEAD_H / 2),
+            px(HEAD_CX + HEAD_W / 2),
+            px(HEAD_CY + HEAD_H / 2),
+        ],
+        fill=255,
+    )
+    cap = Image.new("RGBA", (S, S), (0, 0, 0, 0))
+    dc = ImageDraw.Draw(cap)
+    ell(dc, HEAD_CX, 0.245, 0.54, 0.30, C_DARK, outline=None)
+    # brow dip between the eyes, so the cap reads as a marking not a helmet
+    ell(dc, HEAD_CX, 0.352, 0.155, 0.115, C_FUR, outline=None)
+    cap.putalpha(Image.composite(cap.getchannel("A"), Image.new("L", (S, S), 0), mask))
+    layer.alpha_composite(cap)
+
+
+def draw_eyes(d, p):
+    blink = p["blink"]
+    lx, ly = 0.383, 0.372
+    rx, ry = 0.617, 0.372
+    dx, dy = p.get("look", (0.0, 0.0))
+    for cx, cy in ((lx, ly), (rx, ry)):
+        if p.get("cross"):
+            for ang in (45, -45):
+                a = math.radians(ang)
+                hx, hy = 0.042 * math.cos(a), 0.042 * math.sin(a)
+                d.line(
+                    [px(cx - hx), px(cy - hy), px(cx + hx), px(cy + hy)],
+                    fill=C_OUTLINE,
+                    width=_w(0.014),
+                )
+            continue
+        if blink > 0.55:
+            d.arc(
+                [px(cx - 0.052), px(cy - 0.030), px(cx + 0.052), px(cy + 0.040)],
+                start=200,
+                end=340,
+                fill=C_OUTLINE,
+                width=_w(0.013),
+            )
+            continue
+        h = lerp(0.118, 0.030, blink)
+        ell(d, cx, cy, 0.106, h, C_WHITE)
+        if h > 0.06:
+            ell(d, cx + dx, cy + dy * 0.6, 0.082, min(h - 0.022, 0.092), C_IRIS, outline=None)
+            ell(d, cx + dx, cy + dy * 0.6, 0.046, min(h - 0.045, 0.056), C_PUPIL, outline=None)
+            ell(d, cx + dx - 0.020, cy + dy * 0.6 - 0.024, 0.030, 0.026, C_WHITE, outline=None)
+    # Tan brow dots on the slate cap (the shepherd/doberman marking) rather
+    # than dashes — as lines above the eyes they read as heavy eyelids and
+    # make an idle pet look permanently fed up.
+    raise_ = p.get("brow", 0.0)
+    angry = p.get("brow_angle", 0.0)
+    for side, cx in ((-1, lx), (1, rx)):
+        by = 0.291 - 0.020 * raise_
+        ell(
+            d,
+            cx + side * 0.006,
+            by + side * angry * 0.020,
+            0.062,
+            0.040,
+            C_BROW,
+            outline=None,
+        )
+
+
+def draw_muzzle(d, p):
+    mouth = p["mouth"]
+    ell(d, 0.50, 0.487, 0.285, 0.195, C_FUR)
+    # nose
+    ell(d, 0.50, 0.440, 0.105, 0.078, C_NOSE, outline=None)
+    ell(d, 0.478, 0.428, 0.030, 0.020, (92, 102, 124, 255), outline=None)
+    if mouth > 0.02:
+        h = 0.030 + 0.085 * mouth
+        w = 0.105 + 0.055 * mouth
+        ell(d, 0.50, 0.500 + h / 2 - 0.008, w, h, C_NOSE)
+        ell(d, 0.50, 0.500 + h * 0.72, w * 0.60, h * 0.52, C_TONGUE, outline=None)
+    else:
+        # closed muzzle: a short philtrum down from the nose into two
+        # downward-bulging curves (PIL arcs run clockwise from 3 o'clock with
+        # y down, so 0->180 is the lower half — the smiling side).
+        d.line([px(0.50), px(0.470), px(0.50), px(0.508)], fill=C_OUTLINE, width=_w(0.011))
+        for side in (-1, 1):
+            cx = 0.50 + side * 0.032
+            d.arc(
+                [px(cx - 0.032), px(0.492), px(cx + 0.032), px(0.536)],
+                start=0,
+                end=180,
+                fill=C_OUTLINE,
+                width=_w(0.011),
+            )
+
+
+def draw_head(layer, p):
+    d = ImageDraw.Draw(layer)
+    draw_ears(d, p)
+    ell(d, HEAD_CX, HEAD_CY, HEAD_W, HEAD_H, C_FUR)
+    draw_cap(layer, p)
+    # blaze
+    poly(d, bolt_shape(0.50, 0.243, 0.088, 0.150), C_BOLT, outline=None)
+    draw_muzzle(d, p)
+    draw_eyes(d, p)
+
+
+# --- extras ----------------------------------------------------------------
+def draw_extras(layer, p):
+    d = ImageDraw.Draw(layer)
+    kind = p.get("extras")
+    if kind == "listen":
+        for i in range(3):
+            r = 0.045 + i * 0.036
+            alpha = int(210 - i * 55)
+            phase = p.get("phase", 0)
+            if (phase + i) % 3 == 0:
+                alpha = min(255, alpha + 45)
+            d.arc(
+                [px(0.845 - r), px(0.235 - r), px(0.845 + r), px(0.235 + r)],
+                start=200,
+                end=340,
+                fill=C_GLOW[:3] + (alpha,),
+                width=_w(0.014),
+            )
+    elif kind == "think":
+        phase = p.get("phase", 0)
+        for i in range(3):
+            grow = 1.0 if i == phase % 3 else 0.62
+            ell(
+                layer_d := d,
+                0.735 + i * 0.072,
+                0.145 - i * 0.030,
+                0.040 * grow,
+                0.040 * grow,
+                C_GLOW,
+                outline=C_OUTLINE,
+                ow=0.008,
+            )
+    elif kind == "error":
+        poly(d, bolt_shape(0.815, 0.185, 0.070, 0.120), (235, 92, 74, 255))
+
+
+# --- side view: the walk cycle ---------------------------------------------
+# The pose above is a front-facing sit, which is right for standing around but
+# slides like a chess piece the moment the pet actually moves. Walking gets its
+# own construction: a profile torso, four legs following a paw path, and a head
+# side-on. Drawn facing RIGHT — ui/pet_window.py mirrors it when he walks left.
+
+_GROUND = 0.930  # paw centre while a foot is planted
+_STRIDE = 0.088  # how far ahead of / behind the pivot a paw reaches
+_LIFT = 0.080  # peak height of a paw mid-swing
+_STANCE = 0.62  # fraction of the cycle a foot spends on the ground
+
+FRONT_PIVOT = (0.650, 0.620)
+HIND_PIVOT = (0.315, 0.640)
+WALK_HEAD = (0.780, 0.370, 0.260, 0.250)  # cx, cy, w, h
+
+
+def paw_position(pivot, phase):
+    """Where one paw is at *phase* (0..1) of the cycle.
+
+    Stance is the half that matters: the foot is planted and travels backwards
+    under the dog at a constant rate. The window advances this cycle by
+    distance travelled rather than by clock, so that backwards travel cancels
+    the forward motion and the feet don't skate.
+    """
+    phase %= 1.0
+    if phase < _STANCE:
+        t = phase / _STANCE
+        return pivot[0] + _STRIDE - 2 * _STRIDE * t, _GROUND
+    t = (phase - _STANCE) / (1.0 - _STANCE)
+    return (
+        pivot[0] - _STRIDE + 2 * _STRIDE * t,
+        _GROUND - _LIFT * math.sin(math.pi * t),
+    )
+
+
+def draw_leg(d, pivot, paw, fill, bend=0.032, top=0.052, toe=0.030):
+    """A limb from pivot to paw: a bezier through a displaced knee, tapered
+    from thigh to ankle.
+
+    Tapering matters more than it sounds — a constant-width limb reads as a
+    length of white pipe, and four of them make the dog look like furniture.
+    """
+    vx, vy = paw[0] - pivot[0], paw[1] - pivot[1]
+    length = math.hypot(vx, vy) or 1e-6
+    nx, ny = -vy / length, vx / length  # perpendicular; points backwards
+    knee = (
+        (pivot[0] + paw[0]) / 2 + nx * bend,
+        (pivot[1] + paw[1]) / 2 + ny * bend,
+    )
+    pts = []
+    for i in range(13):
+        t = i / 12
+        x = (1 - t) ** 2 * pivot[0] + 2 * (1 - t) * t * knee[0] + t**2 * paw[0]
+        y = (1 - t) ** 2 * pivot[1] + 2 * (1 - t) * t * knee[1] + t**2 * paw[1]
+        pts.append((x, y, lerp(top, toe, t)))
+    draw_tapered(d, pts, lambda _t: fill)
+    ell(d, paw[0], paw[1] + 0.008, 0.098, 0.056, fill)
+
+
+def draw_walk_tail(d, p, dy):
+    """A curled plume over the back.
+
+    Cubic rather than quadratic: a single control point can only bend one way,
+    which gives a straight tapered tube — a club with a white ball on the end,
+    not a tail. The curl back over the spine is what makes it read.
+    """
+    wag = p["tail"]
+    base = (0.250, 0.575 + dy)
+    c1 = (0.075, 0.545 + dy - 0.030 * wag)
+    c2 = (0.070, 0.300 + dy - 0.040 * wag)
+    end = (0.215, 0.290 + dy - 0.020 * wag)
+    pts = []
+    for i in range(29):
+        t = i / 28
+        u = 1 - t
+        x = u**3 * base[0] + 3 * u**2 * t * c1[0] + 3 * u * t**2 * c2[0] + t**3 * end[0]
+        y = u**3 * base[1] + 3 * u**2 * t * c1[1] + 3 * u * t**2 * c2[1] + t**3 * end[1]
+        pts.append((x, y, lerp(0.076, 0.028, t)))
+    draw_tapered(d, pts, lambda t: C_DARK if t < 0.90 else C_FUR)
+
+
+def draw_torso(d, dy):
+    """Rump + barrel + chest as one silhouette.
+
+    Drawn in two passes — every shape swollen by the stroke width in the
+    outline colour, then every shape again at true size in the fill. Outlining
+    each piece individually instead leaves the construction arcs showing
+    across the body, which looks like the dog has panel lines.
+    """
+    shapes = [
+        ("ell", 0.300, 0.600 + dy, 0.290, 0.300, 0.0),
+        ("rrect", 0.480, 0.585 + dy, 0.520, 0.265, 0.130),
+        ("ell", 0.650, 0.590 + dy, 0.250, 0.280, 0.0),
+    ]
+    grow = 2 * OW
+    for colour, pad in ((C_OUTLINE, grow), (C_DARK, 0.0)):
+        for shape in shapes:
+            kind, cx, cy, w, h, extra = shape
+            if kind == "ell":
+                ell(d, cx, cy, w + pad, h + pad, colour, outline=None)
+            else:
+                rrect(d, cx, cy, w + pad, h + pad, extra + pad / 2, colour, outline=None)
+    # Belly kept small and low: any bigger and it merges with the cream legs
+    # into one white mass with a slate lid.
+    ell(d, 0.490, 0.672 + dy, 0.350, 0.098, C_FUR, outline=None)
+
+
+def draw_walk_head(layer, p, dy):
+    d = ImageDraw.Draw(layer)
+    cx, cy, w, h = WALK_HEAD[0], WALK_HEAD[1] + dy, WALK_HEAD[2], WALK_HEAD[3]
+
+    # ear first, so the head covers its base
+    bounce = p.get("ear_bounce", 0.0)
+    ear = [
+        (0.690, cy - 0.030),
+        (0.700, cy - 0.150 - 0.012 * bounce),
+        (0.752, cy - 0.205 - 0.018 * bounce),
+        (0.788, cy - 0.090),
+    ]
+    poly(d, ear, C_DARK)
+    inner = [(lerp(0.735, x, 0.58), lerp(cy - 0.040, y, 0.62)) for x, y in ear]
+    poly(d, inner, C_INNER_EAR, outline=None)
+
+    # neck into the chest
+    d.line(
+        [px(0.660), px(cy + 0.190), px(0.735), px(cy + 0.080)],
+        fill=C_OUTLINE,
+        width=_w(0.215),
+        joint="curve",
+    )
+    d.line(
+        [px(0.660), px(cy + 0.190), px(0.735), px(cy + 0.080)],
+        fill=C_DARK,
+        width=_w(0.190),
+        joint="curve",
+    )
+
+    ell(d, cx, cy, w, h, C_FUR)
+
+    # slate cap, clipped to the skull
+    mask = Image.new("L", (S, S), 0)
+    ImageDraw.Draw(mask).ellipse(
+        [px(cx - w / 2), px(cy - h / 2), px(cx + w / 2), px(cy + h / 2)], fill=255
+    )
+    cap = Image.new("RGBA", (S, S), (0, 0, 0, 0))
+    dc = ImageDraw.Draw(cap)
+    ell(dc, cx - 0.010, cy - 0.070, w * 1.02, h * 0.72, C_DARK, outline=None)
+    cap.putalpha(Image.composite(cap.getchannel("A"), Image.new("L", (S, S), 0), mask))
+    layer.alpha_composite(cap)
+
+    poly(d, bolt_shape(0.762, cy - 0.088, 0.062, 0.108), C_BOLT, outline=None)
+
+    # muzzle, nose, mouth
+    ell(d, 0.880, cy + 0.048, 0.145, 0.108, C_FUR)
+    ell(d, 0.950, cy + 0.018, 0.058, 0.048, C_NOSE, outline=None)
+    d.arc(
+        [px(0.885), px(cy + 0.058), px(0.945), px(cy + 0.100)],
+        start=0,
+        end=150,
+        fill=C_OUTLINE,
+        width=_w(0.010),
+    )
+
+    # one eye in profile, plus the brow marking
+    ell(d, 0.812, cy - 0.020, 0.092, 0.100, C_WHITE)
+    ell(d, 0.820, cy - 0.020, 0.062, 0.070, C_IRIS, outline=None)
+    ell(d, 0.824, cy - 0.020, 0.036, 0.042, C_PUPIL, outline=None)
+    ell(d, 0.812, cy - 0.040, 0.026, 0.022, C_WHITE, outline=None)
+    ell(d, 0.795, cy - 0.088, 0.055, 0.034, C_BROW, outline=None)
+
+    # Collar: a band *across* the neck, so it has to run perpendicular to it.
+    # Along the neck it just reads as an orange brick stuck to his chest.
+    collar = [
+        (px(0.648), px(cy + 0.098)),
+        (px(0.762), px(cy + 0.196)),
+    ]
+    d.line(collar, fill=C_OUTLINE, width=_w(0.070), joint="curve")
+    d.line(collar, fill=C_COLLAR, width=_w(0.050), joint="curve")
+    ell(d, 0.712, cy + 0.196, 0.070, 0.070, C_TAG)
+    poly(d, bolt_shape(0.712, cy + 0.196, 0.025, 0.044), C_OUTLINE, outline=None)
+
+
+def render_walk_frame(p) -> Image.Image:
+    base = Image.new("RGBA", (S, S), (0, 0, 0, 0))
+    d = ImageDraw.Draw(base)
+    phase = p["phase"]
+    # Two contacts per cycle, so the body dips twice — the give-away that a
+    # walk cycle is weight-bearing rather than a slide.
+    dy = -0.011 * abs(math.sin(2 * math.pi * phase))
+    head_dy = dy * 0.6 - 0.006 * math.sin(2 * math.pi * phase + 0.7)
+
+    # Diagonal pairs (a trot): each front leg moves with the opposite hind.
+    far_front = paw_position(FRONT_PIVOT, phase + 0.5)
+    far_hind = paw_position(HIND_PIVOT, phase)
+    near_front = paw_position(FRONT_PIVOT, phase)
+    near_hind = paw_position(HIND_PIVOT, phase + 0.5)
+
+    draw_walk_tail(d, p, dy)
+    # far side first, in the shade colour, so the near legs read as in front
+    draw_leg(d, (HIND_PIVOT[0], HIND_PIVOT[1] + dy), far_hind, C_FUR_FAR, bend=0.046)
+    draw_leg(d, (FRONT_PIVOT[0], FRONT_PIVOT[1] + dy), far_front, C_FUR_FAR)
+
+    draw_torso(d, dy)
+
+    draw_leg(d, (HIND_PIVOT[0], HIND_PIVOT[1] + dy), near_hind, C_FUR, bend=0.046)
+    draw_leg(d, (FRONT_PIVOT[0], FRONT_PIVOT[1] + dy), near_front, C_FUR)
+
+    draw_walk_head(base, p, head_dy)
+    return base.resize((OUT, OUT), Image.LANCZOS)
+
+
+# --- frame assembly --------------------------------------------------------
+def default_pose(**over):
+    p = dict(
+        breathe=0.0,
+        tail=0.0,
+        ear=0.0,
+        ear_twitch=0.0,
+        blink=0.0,
+        mouth=0.0,
+        tilt=0.0,
+        head_dy=0.0,
+        look=(0.0, 0.0),
+        brow=0.0,
+        brow_angle=0.0,
+        cross=False,
+        tag_glow=False,
+        extras=None,
+        phase=0,
+    )
+    p.update(over)
+    return p
+
+
+def render_frame(p) -> Image.Image:
+    if p.get("pose") == "walk":
+        return render_walk_frame(p)
+    base = Image.new("RGBA", (S, S), (0, 0, 0, 0))
+
+    body = Image.new("RGBA", (S, S), (0, 0, 0, 0))
+    db = ImageDraw.Draw(body)
+    draw_tail(db, p)
+    draw_body(db, p)
+    draw_collar(db, p)
+    base.alpha_composite(body)
+
+    head = Image.new("RGBA", (S, S), (0, 0, 0, 0))
+    draw_head(head, p)
+    if p["tilt"]:
+        head = head.rotate(
+            p["tilt"], resample=Image.BICUBIC, center=(px(HEAD_CX), px(NECK_Y))
+        )
+    dy = int(px(p["head_dy"]))
+    if dy:
+        shifted = Image.new("RGBA", (S, S), (0, 0, 0, 0))
+        shifted.alpha_composite(head, (0, dy))
+        head = shifted
+    base.alpha_composite(head)
+
+    draw_extras(base, p)
+    return base.resize((OUT, OUT), Image.LANCZOS)
+
+
+def frames_for(state: str) -> list[dict]:
+    if state == "idle":
+        out = []
+        for i in range(8):
+            t = i / 8
+            br = math.sin(t * 2 * math.pi)
+            out.append(
+                default_pose(
+                    breathe=br,
+                    head_dy=-0.006 * br,
+                    tail=math.sin(t * 4 * math.pi),
+                    blink=1.0 if i == 6 else 0.0,
+                )
+            )
+        return out
+    if state == "listening":
+        out = []
+        for i in range(4):
+            t = i / 4
+            out.append(
+                default_pose(
+                    ear=1.0,
+                    ear_twitch=0.35 * math.sin(t * 2 * math.pi),
+                    tilt=-7 + 2.0 * math.sin(t * 2 * math.pi),
+                    brow=1.0,
+                    tail=0.5 * math.sin(t * 2 * math.pi),
+                    head_dy=-0.008,
+                    tag_glow=True,
+                    extras="listen",
+                    phase=i,
+                )
+            )
+        return out
+    if state == "thinking":
+        out = []
+        for i in range(6):
+            t = i / 6
+            out.append(
+                default_pose(
+                    ear=0.25,
+                    tilt=6.0,
+                    look=(0.022, -0.026),
+                    brow=0.5,
+                    breathe=0.4 * math.sin(t * 2 * math.pi),
+                    tail=0.2 * math.sin(t * 2 * math.pi),
+                    extras="think",
+                    phase=i // 2,
+                )
+            )
+        return out
+    if state == "talking":
+        out = []
+        for i in range(4):
+            t = i / 4
+            open_ = (math.sin(t * 2 * math.pi) + 1) / 2
+            out.append(
+                default_pose(
+                    mouth=0.25 + 0.75 * open_,
+                    ear=0.6,
+                    head_dy=-0.010 * open_,
+                    breathe=open_,
+                    tail=math.sin(t * 2 * math.pi + 1.0),
+                    brow=0.35,
+                )
+            )
+        return out
+    if state == "walk":
+        # 8 frames: two full strides, so the loop lands back on the pose it
+        # started from and the cycle is seamless however it's entered.
+        out = []
+        for i in range(8):
+            phase = i / 8
+            out.append(
+                default_pose(
+                    pose="walk",
+                    phase=phase,
+                    tail=math.sin(2 * math.pi * phase),
+                    ear_bounce=math.sin(2 * math.pi * phase + 0.9),
+                )
+            )
+        return out
+    if state == "error":
+        return [
+            default_pose(ear=-1.0, cross=True, brow_angle=1.0, mouth=0.35, tail=-0.6,
+                         extras="error"),
+            default_pose(ear=-0.85, cross=True, brow_angle=1.0, mouth=0.15, tail=-0.4,
+                         head_dy=0.008),
+        ]
+    raise ValueError(state)
+
+
+STATES = ["idle", "listening", "thinking", "talking", "error", "walk"]
+
+
+def main():
+    ap = argparse.ArgumentParser(description=__doc__)
+    ap.add_argument(
+        "--out",
+        type=Path,
+        default=Path(__file__).resolve().parent.parent / "bolt_pet" / "assets" / "sprites",
+    )
+    ap.add_argument("--states", nargs="*", default=STATES)
+    args = ap.parse_args()
+
+    for state in args.states:
+        d = args.out / state
+        d.mkdir(parents=True, exist_ok=True)
+        for old in d.glob("*.png"):
+            old.unlink()
+        for i, pose in enumerate(frames_for(state)):
+            render_frame(pose).save(d / f"frame_{i:02d}.png")
+        print(f"{state}: {len(frames_for(state))} frames -> {d}")
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,169 @@
+"""Screen layout logic — resolving `petctl jump` targets and describing the
+setup. Pure: the monitor list is normally published by the UI, so none of this
+needs a display."""
+
+import sys
+from pathlib import Path
+
+import pytest
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from bolt_pet import monitors as m
+
+
+def grid():
+    """The 2x2 setup this was built against: four 1080p screens.
+
+        [1 HDMI-0] [2 HDMI-1]
+        [3 DP-0  ] [4 DP-2  ]
+    """
+    return [
+        m.Monitor(0, "HDMI-0", 0, 0, 1920, 1080, primary=False),
+        m.Monitor(1, "HDMI-1", 1920, 0, 1920, 1080, primary=False),
+        m.Monitor(2, "DP-0", 0, 1080, 1920, 1080, primary=True),
+        m.Monitor(3, "DP-2", 1920, 1080, 1920, 1080, primary=False),
+    ]
+
+
+def two():
+    return [
+        m.Monitor(0, "eDP-1", 0, 0, 1920, 1080, primary=True),
+        m.Monitor(1, "HDMI-1", 1920, 0, 2560, 1440),
+    ]
+
+
+def test_numbers_shown_to_humans_are_one_based():
+    left, right = two()
+    assert left.index == 0 and left.number == 1
+    assert right.index == 1 and right.number == 2
+    assert "1: eDP-1 1920x1080 (primary)" == left.label
+
+
+def test_geometry_helpers():
+    screen = m.Monitor(1, "HDMI-1", 1920, 0, 1920, 1080)
+    assert screen.right == 3840 and screen.bottom == 1080
+    assert screen.center == (2880, 540)
+    assert screen.contains(1920, 0)
+    assert screen.contains(3839, 1079)
+    assert not screen.contains(3840, 0)  # right edge is exclusive
+    assert not screen.contains(1919, 0)
+
+
+def test_monitor_containing_and_nearest():
+    screens = grid()
+    assert m.monitor_containing(screens, 100, 100).name == "HDMI-0"
+    assert m.monitor_containing(screens, 2000, 1500).name == "DP-2"
+    assert m.monitor_containing(screens, -50, -50) is None
+    # off the desktop entirely still resolves to something
+    assert m.nearest_monitor(screens, -500, -500).name == "HDMI-0"
+
+
+def test_resolve_by_number():
+    screens = grid()
+    assert m.resolve(screens, "3").name == "DP-0"
+    with pytest.raises(ValueError, match="no monitor 9"):
+        m.resolve(screens, "9")
+    with pytest.raises(ValueError):
+        m.resolve(screens, "0")
+
+
+def test_resolve_next_and_prev_wrap():
+    screens = grid()
+    assert m.resolve(screens, "next", current=3).number == 1
+    assert m.resolve(screens, "prev", current=0).number == 4
+    assert m.resolve(screens, "next", current=0).number == 2
+
+
+def test_resolve_primary_and_other():
+    screens = grid()
+    assert m.resolve(screens, "primary", current=0).name == "DP-0"
+    # "other" on a two-screen setup is genuinely the other one
+    pair = two()
+    assert m.resolve(pair, "other", current=0).number == 2
+    assert m.resolve(pair, "other", current=1).number == 1
+
+
+def test_resolve_directions_on_a_grid():
+    screens = grid()
+    # from top-left (HDMI-0)
+    assert m.resolve(screens, "right", current=0).name == "HDMI-1"
+    assert m.resolve(screens, "down", current=0).name == "DP-0"
+    # from bottom-right (DP-2)
+    assert m.resolve(screens, "left", current=3).name == "DP-0"
+    assert m.resolve(screens, "up", current=3).name == "HDMI-1"
+
+
+def test_direction_prefers_the_best_aligned_screen():
+    screens = grid()
+    # "right" from DP-0 (bottom-left) must pick DP-2 (same row), not HDMI-1,
+    # even though both are to the right.
+    assert m.resolve(screens, "right", current=2).name == "DP-2"
+
+
+def test_resolve_direction_with_nothing_there():
+    screens = grid()
+    with pytest.raises(ValueError, match="no monitor to the left"):
+        m.resolve(screens, "left", current=0)
+
+
+def test_resolve_by_name_is_fuzzy_but_refuses_ambiguity():
+    screens = grid()
+    assert m.resolve(screens, "dp-2").name == "DP-2"
+    assert m.resolve(screens, "HDMI-0").name == "HDMI-0"
+    with pytest.raises(ValueError, match="matches several"):
+        m.resolve(screens, "hdmi")
+
+
+def test_resolve_unknown_spec_lists_the_options():
+    screens = two()
+    with pytest.raises(ValueError) as excinfo:
+        m.resolve(screens, "the big one")
+    assert "eDP-1" in str(excinfo.value) and "HDMI-1" in str(excinfo.value)
+
+
+def test_resolve_without_a_current_screen_falls_back_to_primary():
+    screens = grid()
+    # primary is index 2, so "next" from nowhere is index 3
+    assert m.resolve(screens, "next", current=None).number == 4
+    # an out-of-range current is treated the same way rather than exploding
+    assert m.resolve(screens, "next", current=99).number == 4
+
+
+def test_resolve_needs_monitors():
+    with pytest.raises(ValueError, match="no monitors"):
+        m.resolve([], "next")
+    with pytest.raises(ValueError, match="needs a target"):
+        m.resolve(grid(), "")
+
+
+def test_random_always_moves_somewhere_else():
+    screens = grid()
+    for current in range(4):
+        assert m.resolve(screens, "random", current=current).index != current
+
+
+def test_summary_is_one_line_and_marks_where_the_pet_is():
+    line = m.summary(grid(), current=1)
+    assert "\n" not in line
+    assert line.startswith("4 monitors:")
+    assert "Bolt is on 2" in line
+    assert m.summary([]) is None
+    assert "Bolt is on" not in m.summary(grid(), current=None)
+
+
+def test_annotate_matches_the_screen_context_style():
+    out = m.annotate("what's on the other screen?", grid(), current=0)
+    assert out.startswith("what's on the other screen?")
+    assert "[4 monitors:" in out
+    # nothing to say, nothing added
+    assert m.annotate("hello", [], None) == "hello"
+    assert m.annotate("", grid(), 0) == ""
+
+
+def test_describe_lists_every_screen_and_flags_the_pet():
+    text = m.describe(grid(), current=2)
+    assert text.count("\n") == 4  # header + 4 screens
+    assert "DP-0" in text and "+0+1080" in text
+    assert text.count("Bolt is here") == 1
+    assert m.describe([]) == "[pet] no monitor information available"
@@ -15,7 +15,10 @@ sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

 from bolt_pet import config
 from bolt_pet.state import PetState
-from bolt_pet.ui.pet_window import _EMOTE_TICKS, PetWindow, emote_transform
+from bolt_pet.ui.pet_window import (
+    _EMOTE_TICKS, _WALK_PIXELS_PER_FRAME, PetWindow, emote_transform,
+)
+from bolt_pet.ui.sprite import WALK


@pytest.fixture(scope="module")
@@ -179,3 +182,153 @@ def test_click_through_toggles_mouse_transparency(pet):

    pet.set_click_through(False)
    assert pet.testAttribute(Qt.WA_TransparentForMouseEvents) is False
+
+
+# ── monitors ────────────────────────────────────────────────────────────────
+
+def test_window_publishes_a_monitor_list(pet):
+    """Whatever the test host's screen setup is, the window must describe it
+    in the shape the controller expects."""
+    monitors = pet.monitors()
+    assert monitors, "offscreen Qt still reports at least one screen"
+    assert [m.index for m in monitors] == list(range(len(monitors)))
+    assert all(m.width > 0 and m.height > 0 for m in monitors)
+    assert all(m.name for m in monitors)
+    assert sum(1 for m in monitors if m.primary) <= 1
+
+
+def test_publish_monitors_re_emits_when_forced(pet):
+    """ui/app.py relies on this: the window is built before the controller
+    exists, so its constructor's publish reaches nobody and has to be redone."""
+    seen = []
+    pet.monitors_changed.connect(seen.append)
+    pet.publish_monitors()  # force defaults to True
+    assert len(seen) == 1
+    pet.publish_monitors(force=False)  # nothing changed -> stays quiet
+    assert len(seen) == 1
+
+
+def test_pet_reports_which_monitor_it_is_on(pet):
+    seen = []
+    pet.pet_monitor_changed.connect(seen.append)
+    pet.publish_monitors()
+    assert seen and seen[-1] == pet.current_monitor_index()
+    assert 0 <= seen[-1] < len(pet.monitors())
+
+
+def test_jump_moves_the_window_onto_the_target_screen(pet):
+    monitors = pet.monitors()
+    target = len(monitors) - 1
+    pet.apply_action({"action": "jump", "monitor": target})
+    assert pet.current_monitor_index() == target
+    # a jump lands with a hop rather than sliding there
+    assert pet._emote == "hop"
+
+
+def test_jump_cancels_a_stroll_so_it_does_not_walk_back(pet):
+    pet.apply_action({"action": "move", "anchor": "top-left"})
+    assert pet._wander_target is not None
+    pet.apply_action({"action": "jump", "monitor": 0})
+    assert pet._wander_target is None
+    assert pet._commanded_move is False
+
+
+def test_jump_to_a_bogus_index_is_a_no_op(pet):
+    before = pet.pos()
+    pet.apply_action({"action": "jump", "monitor": 99})
+    pet.apply_action({"action": "jump", "monitor": -1})
+    assert pet.pos() == before
+
+
+# ── walk cycle ──────────────────────────────────────────────────────────────
+
+def test_walk_art_loads_as_a_non_state_animation(pet):
+    """Walking is a property of movement, not a PetState, so it lives outside
+    the state machine but still loads like any other animation."""
+    assert pet.sprites.has(WALK)
+    assert len(pet.sprites.get(WALK).frames) == 8
+    assert pet.sprites.get("nonsense") is pet.sprites.get(PetState.IDLE)
+    assert not pet.sprites.has("nonsense")
+
+
+def test_walking_overrides_the_state_animation(pet):
+    assert pet._animation_key() == pet._current_state
+    pet._advance_walk(50, 0, 1.0)
+    assert pet._animation_key() == WALK
+
+
+def test_walk_cycle_advances_by_distance_not_by_the_clock(pet):
+    """The planted paw tracks backwards at the speed the window moves
+    forwards; drive it off the animation timer instead and the feet skate."""
+    anim = pet.sprites.get(WALK)
+    anim.reset()
+    pet._advance_walk(100, 0, _WALK_PIXELS_PER_FRAME * 3)
+    assert anim._index == 3
+    # a step too small to cross the threshold banks the distance instead
+    pet._advance_walk(100, 0, _WALK_PIXELS_PER_FRAME * 0.5)
+    assert anim._index == 3
+    pet._advance_walk(100, 0, _WALK_PIXELS_PER_FRAME * 0.5)
+    assert anim._index == 4
+
+
+def test_the_animation_timer_does_not_double_step_the_walk(pet):
+    anim = pet.sprites.get(WALK)
+    pet._advance_walk(50, 0, 1.0)
+    anim.reset()
+    pet._advance_frame()
+    assert anim._index == 0
+
+
+def test_facing_follows_horizontal_travel(pet):
+    pet._advance_walk(50, 0, 1.0)
+    assert pet._facing == 1
+    pet._advance_walk(-50, 0, 1.0)
+    assert pet._facing == -1
+
+
+def test_a_near_vertical_stroll_does_not_flip_him(pet):
+    """Rounding noise on dx would otherwise flip him back and forth every
+    tick on a straight-up walk."""
+    pet._facing = 1
+    pet._advance_walk(0.4, 60, 1.0)
+    assert pet._facing == 1
+
+
+def test_walking_left_paints_a_mirrored_frame(pet):
+    frame = pet.sprites.get(WALK).current()
+    pet._facing = 1
+    assert pet._oriented(frame) is frame  # art is drawn facing right
+    pet._facing = -1
+    flipped = pet._oriented(frame)
+    assert flipped is not frame
+    assert flipped.size() == frame.size()
+    assert pet._oriented(frame) is flipped  # cached, not re-flipped per paint
+
+
+def test_stopping_resets_the_cycle_to_a_standing_frame(pet):
+    pet._advance_walk(50, 0, _WALK_PIXELS_PER_FRAME * 2)
+    assert pet._walking
+    pet._stop_walking()
+    assert not pet._walking
+    assert pet._walk_distance == 0.0
+    assert pet.sprites.get(WALK)._index == 0
+    assert pet._animation_key() == pet._current_state
+
+
+def test_walk_art_suppresses_the_hard_coded_bob(pet):
+    """The frames carry their own weight shift — bobbing the window as well
+    would double it up."""
+    pet._advance_walk(50, 0, 5.0)
+    assert pet._bob_offset == 0
+
+
+def test_without_walk_art_it_falls_back_to_the_old_bob(qt_app, tmp_path):
+    window = PetWindow(sprite_dir=tmp_path)
+    try:
+        assert not window.sprites.has(WALK)
+        window._advance_walk(50, 0, 5.0)
+        assert window._walking
+        assert window._animation_key() == window._current_state
+        assert window._bob_offset < 0  # still visibly moving
+    finally:
+        window.close()
@@ -0,0 +1,168 @@
+"""OCR plumbing for `petctl read` — engine selection and output cleanup.
+
+Only the pure half is covered, per the testing conventions: capture and the
+OCR call itself need a real screen and a real engine. Engine probes are
+injected so these pass on a machine with a different set installed (or none).
+"""
+
+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+from bolt_pet import screen_text
+from bolt_pet.monitors import Monitor
+
+
+def probes(modules=(), binaries=()):
+    return (lambda name: name in modules), (
+        lambda name: f"/usr/bin/{name}" if name in binaries else None
+    )
+
+
+def test_prefers_tesseract_when_fully_installed():
+    has_module, which = probes({"pytesseract"}, {"tesseract"})
+    assert screen_text.resolve_engine(has_module, which) == ("pytesseract", "")
+
+
+def test_falls_back_to_rapidocr_when_tesseract_binary_is_absent():
+    has_module, which = probes({"pytesseract", "rapidocr_onnxruntime"}, set())
+    engine, reason = screen_text.resolve_engine(has_module, which)
+    assert engine == "rapidocr"
+    assert reason == ""
+
+
+def test_pytesseract_without_the_binary_says_which_half_is_missing():
+    """The commonest broken setup: `pip install pytesseract` and stop, not
+    realising the actual engine is a system package."""
+    has_module, which = probes({"pytesseract"}, set())
+    engine, reason = screen_text.resolve_engine(has_module, which)
+    assert engine is None
+    assert "tesseract binary" in reason
+    assert "apt install tesseract-ocr" in reason
+
+
+def test_nothing_installed_explains_how_to_fix_it():
+    has_module, which = probes(set(), set())
+    engine, reason = screen_text.resolve_engine(has_module, which)
+    assert engine is None
+    assert "pip install" in reason
+
+
+def test_capture_availability_follows_mss():
+    assert screen_text.capture_available(lambda name: name == "mss")
+    assert not screen_text.capture_available(lambda name: False)
+
+
+def test_clean_drops_ocr_noise_and_blank_runs():
+    raw = "Firefox\n\n\n |\n  .\nBuild failed\n~\n"
+    assert screen_text.clean_ocr_text(raw) == "Firefox\nBuild failed"
+
+
+def test_clean_collapses_whitespace_but_keeps_line_structure():
+    raw = "  File     edit   view  \nline\ttwo  "
+    assert screen_text.clean_ocr_text(raw) == "File edit view\nline two"
+
+
+def test_clean_drops_consecutive_duplicates_only():
+    raw = "Terminal\nTerminal\nEditor\nTerminal"
+    assert screen_text.clean_ocr_text(raw) == "Terminal\nEditor\nTerminal"
+
+
+def test_clean_keeps_short_but_real_tokens():
+    # two alphanumerics is the bar — "ok" and "42" survive, "-" doesn't
+    assert screen_text.clean_ocr_text("ok\n-\n42") == "ok\n42"
+
+
+def test_clean_truncates_and_says_so():
+    out = screen_text.clean_ocr_text("word " * 500, max_chars=100)
+    assert out.endswith("[truncated]")
+    # the cap applies to the text, before the marker is appended
+    assert len(out.split("\n[truncated]")[0]) <= 100
+
+
+def test_clean_handles_empty_input():
+    assert screen_text.clean_ocr_text("") == ""
+    assert screen_text.clean_ocr_text(None) == ""
+
+
+def test_format_reading_names_the_monitor():
+    monitor = Monitor(1, "HDMI-1", 1920, 0, 1920, 1080)
+    out = screen_text.format_reading(monitor, "Build failed")
+    assert "monitor 2 (HDMI-1)" in out
+    assert out.endswith("Build failed")
+
+
+def test_format_reading_when_nothing_was_recognised():
+    monitor = Monitor(0, "DP-0", 0, 0, 1920, 1080)
+    assert "no text recognised" in screen_text.format_reading(monitor, "   ")
+
+
+def test_read_monitor_never_raises_without_an_engine(monkeypatch):
+    """Its return value goes back to the server as command output, so every
+    failure has to come back as a sentence rather than an exception."""
+    monkeypatch.setattr(screen_text, "capture_available", lambda *a, **k: True)
+    monkeypatch.setattr(
+        screen_text, "resolve_engine", lambda *a, **k: (None, "no engine here")
+    )
+    out = screen_text.read_monitor(Monitor(0, "DP-0", 0, 0, 1920, 1080))
+    assert out.startswith("[pet]")
+    assert "no engine here" in out
+
+
+def test_read_monitor_reports_a_failed_capture(monkeypatch):
+    monkeypatch.setattr(screen_text, "capture_available", lambda *a, **k: True)
+    monkeypatch.setattr(screen_text, "resolve_engine", lambda *a, **k: ("pytesseract", ""))
+    monkeypatch.setattr(screen_text, "capture", lambda monitor: None)
+    out = screen_text.read_monitor(Monitor(0, "DP-0", 0, 0, 1920, 1080))
+    assert "couldn't capture" in out and "Wayland" in out
+
+
+def test_read_monitor_survives_an_exploding_engine(monkeypatch):
+    monkeypatch.setattr(screen_text, "capture_available", lambda *a, **k: True)
+    monkeypatch.setattr(screen_text, "resolve_engine", lambda *a, **k: ("pytesseract", ""))
+    monkeypatch.setattr(screen_text, "capture", lambda monitor: object())
+    monkeypatch.setattr(
+        screen_text, "_ocr", lambda image, engine: (_ for _ in ()).throw(RuntimeError("boom"))
+    )
+    out = screen_text.read_monitor(Monitor(0, "DP-0", 0, 0, 1920, 1080))
+    assert "OCR failed" in out and "boom" in out
+
+
+def test_read_monitors_splits_the_budget(monkeypatch):
+    seen = []
+
+    def fake_read(monitor, max_chars):
+        seen.append((monitor.number, max_chars))
+        return f"screen {monitor.number}"
+
+    monkeypatch.setattr(screen_text, "read_monitor", fake_read)
+    screens = [
+        Monitor(0, "A", 0, 0, 100, 100),
+        Monitor(1, "B", 100, 0, 100, 100),
+        Monitor(2, "C", 200, 0, 100, 100),
+    ]
+    out = screen_text.read_monitors(screens, 3000)
+    assert [n for n, _ in seen] == [1, 2, 3]
+    assert all(limit == 1000 for _, limit in seen)
+    assert out.count("screen ") == 3
+
+
+def test_read_monitors_keeps_a_floor_on_the_budget(monkeypatch):
+    monkeypatch.setattr(
+        screen_text, "read_monitor", lambda monitor, max_chars: str(max_chars)
+    )
+    screens = [Monitor(i, str(i), 0, 0, 10, 10) for i in range(20)]
+    # 100/20 would be 5 characters per screen, which is useless — floor wins
+    assert "400" in screen_text.read_monitors(screens, 100)
+
+
+def test_read_monitors_with_one_screen_uses_the_whole_budget(monkeypatch):
+    monkeypatch.setattr(
+        screen_text, "read_monitor", lambda monitor, max_chars: str(max_chars)
+    )
+    assert screen_text.read_monitors([Monitor(0, "A", 0, 0, 10, 10)], 4000) == "4000"
+
+
+def test_read_monitors_with_no_screens():
+    assert "no monitor information" in screen_text.read_monitors([], 4000)
@@ -0,0 +1,233 @@
+"""End-to-end wiring for the multi-monitor features: `petctl jump`, `petctl
+monitors`, `petctl read`, and the screen-layout note that rides along with
+each utterance.
+
+Needs a QApplication (signals), so run with QT_QPA_PLATFORM=offscreen.
+"""
+
+import sys
+from pathlib import Path
+
+import pytest
+from PySide6.QtWidgets import QApplication
+
+from bolt_pet import controller as controller_mod
+from bolt_pet import pet_actions
+from bolt_pet.monitors import Monitor
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent))
+
+_app = QApplication.instance() or QApplication(["test"])
+
+
+@pytest.fixture(autouse=True)
+def no_screen_probes(monkeypatch):
+    monkeypatch.setattr(controller_mod.screen_context, "is_fullscreen_active", lambda: False)
+    monkeypatch.setattr(controller_mod.screen_context, "context_for", lambda text: text)
+
+
+@pytest.fixture
+def ctrl():
+    controller = controller_mod.PetController()
+    controller.set_monitors(
+        [
+            Monitor(0, "HDMI-0", 0, 0, 1920, 1080),
+            Monitor(1, "HDMI-1", 1920, 0, 1920, 1080),
+            Monitor(2, "DP-0", 0, 1080, 1920, 1080, primary=True),
+        ]
+    )
+    controller.set_pet_monitor(0)
+    return controller
+
+
+def _capture(signal):
+    events = []
+    signal.connect(lambda *a: events.append(a[0] if len(a) == 1 else a))
+    return events
+
+
+# ── parsing ─────────────────────────────────────────────────────────────────
+
+def test_jump_parses_without_validating_the_target():
+    """Which monitors exist is a runtime fact, so the pure parser passes the
+    spec through and monitors.resolve() judges it later."""
+    assert pet_actions.parse("petctl jump 2") == {"action": "jump", "target": "2"}
+    assert pet_actions.parse("petctl jump next") == {"action": "jump", "target": "next"}
+    assert pet_actions.parse("petctl monitor left") == {"action": "jump", "target": "left"}
+    assert pet_actions.parse("petctl screen HDMI-1") == {"action": "jump", "target": "HDMI-1"}
+    # a nonsense target is still parsed — it fails at resolve time, with a
+    # message listing the real monitors
+    assert pet_actions.parse("petctl jump sideways") == {
+        "action": "jump", "target": "sideways",
+    }
+
+
+def test_jump_needs_a_target():
+    with pytest.raises(pet_actions.ActionError, match="needs a monitor"):
+        pet_actions.parse("petctl jump")
+
+
+def test_read_defaults_to_the_current_screen():
+    assert pet_actions.parse("petctl read") == {"action": "read", "target": "here"}
+    assert pet_actions.parse("petctl read all") == {"action": "read", "target": "all"}
+    assert pet_actions.parse("petctl look 2") == {"action": "read", "target": "2"}
+    assert pet_actions.parse("petctl see here") == {"action": "read", "target": "here"}
+
+
+def test_monitors_verb():
+    for spelling in ("monitors", "screens", "displays"):
+        assert pet_actions.parse(f"petctl {spelling}") == {"action": "monitors"}
+
+
+def test_help_mentions_the_new_verbs():
+    assert "petctl jump" in pet_actions.HELP
+    assert "petctl read" in pet_actions.HELP
+    assert "petctl monitors" in pet_actions.HELP
+
+
+# ── jump ────────────────────────────────────────────────────────────────────
+
+def test_jump_resolves_to_an_index_before_reaching_the_window(ctrl):
+    """The controller resolves and emits a concrete index, so the window can't
+    re-resolve the spec against a different screen ordering."""
+    actions = _capture(ctrl.action)
+    out = ctrl._handle_command("petctl jump next")
+    assert actions == [{"action": "jump", "monitor": 1}]
+    assert "monitor 2: HDMI-1" in out
+
+
+def test_jump_by_direction_uses_the_published_layout(ctrl):
+    actions = _capture(ctrl.action)
+    ctrl._handle_command("petctl jump down")
+    assert actions == [{"action": "jump", "monitor": 2}]
+
+
+def test_jump_tracks_where_the_pet_actually_is(ctrl):
+    ctrl.set_pet_monitor(1)
+    actions = _capture(ctrl.action)
+    ctrl._handle_command("petctl jump left")
+    assert actions == [{"action": "jump", "monitor": 0}]
+
+
+def test_jump_to_a_nonexistent_monitor_reports_back_and_moves_nothing(ctrl):
+    actions = _capture(ctrl.action)
+    out = ctrl._handle_command("petctl jump 7")
+    assert actions == []
+    assert "no monitor 7" in out
+    assert "you have 3" in out
+
+
+def test_jump_never_reaches_the_shell(monkeypatch, ctrl):
+    ran = []
+    monkeypatch.setattr(controller_mod.server_client, "run_local_command", ran.append)
+    ctrl._handle_command("petctl jump 2")
+    ctrl._handle_command("petctl monitors")
+    ctrl._handle_command("petctl read")
+    assert ran == []
+
+
+# ── monitors ────────────────────────────────────────────────────────────────
+
+def test_monitors_lists_the_layout_and_where_the_pet_is(ctrl):
+    ctrl.set_pet_monitor(2)
+    out = ctrl._handle_command("petctl monitors")
+    assert "3 monitor(s)" in out
+    assert "HDMI-0" in out and "DP-0" in out
+    assert out.count("Bolt is here") == 1
+
+
+def test_monitors_before_the_ui_has_published_anything():
+    fresh = controller_mod.PetController()
+    assert "no monitor information" in fresh._handle_command("petctl monitors")
+
+
+# ── read ────────────────────────────────────────────────────────────────────
+
+def test_read_here_uses_the_pets_own_screen(monkeypatch, ctrl):
+    seen = []
+    monkeypatch.setattr(
+        controller_mod.screen_text, "read_monitor",
+        lambda monitor, limit: seen.append(monitor.number) or "text",
+    )
+    ctrl.set_pet_monitor(1)
+    assert ctrl._handle_command("petctl read") == "text"
+    assert seen == [2]
+
+
+def test_read_a_named_screen(monkeypatch, ctrl):
+    seen = []
+    monkeypatch.setattr(
+        controller_mod.screen_text, "read_monitor",
+        lambda monitor, limit: seen.append(monitor.name) or "text",
+    )
+    ctrl._handle_command("petctl read DP-0")
+    assert seen == ["DP-0"]
+
+
+def test_read_all_goes_through_the_multi_screen_path(monkeypatch, ctrl):
+    seen = []
+    monkeypatch.setattr(
+        controller_mod.screen_text, "read_monitors",
+        lambda monitors, limit: seen.append(len(monitors)) or "everything",
+    )
+    assert ctrl._handle_command("petctl read all") == "everything"
+    assert seen == [3]
+
+
+def test_read_an_unknown_screen_explains_rather_than_raising(ctrl):
+    out = ctrl._handle_command("petctl read 9")
+    assert out.startswith("[pet]")
+    assert "no monitor 9" in out
+
+
+def test_read_respects_the_kill_switch(monkeypatch, ctrl):
+    monkeypatch.setattr(controller_mod.config, "SCREEN_TEXT", False)
+    called = []
+    monkeypatch.setattr(
+        controller_mod.screen_text, "read_monitor",
+        lambda *a, **k: called.append(1) or "text",
+    )
+    out = ctrl._handle_command("petctl read")
+    assert called == []
+    assert "disabled" in out and "SCREEN_TEXT" in out
+
+
+def test_read_passes_the_character_cap_through(monkeypatch, ctrl):
+    monkeypatch.setattr(controller_mod.config, "SCREEN_TEXT_MAX_CHARS", 123)
+    seen = []
+    monkeypatch.setattr(
+        controller_mod.screen_text, "read_monitor",
+        lambda monitor, limit: seen.append(limit) or "text",
+    )
+    ctrl._handle_command("petctl read")
+    assert seen == [123]
+
+
+# ── per-turn context ────────────────────────────────────────────────────────
+
+def test_layout_rides_along_with_each_utterance(monkeypatch, ctrl):
+    monkeypatch.setattr(controller_mod.config, "MONITOR_CONTEXT", True)
+    out = ctrl._with_context("what's on the other screen?")
+    assert out.startswith("what's on the other screen?")
+    assert "3 monitors:" in out
+    assert "Bolt is on 1" in out
+
+
+def test_layout_context_can_be_switched_off(monkeypatch, ctrl):
+    monkeypatch.setattr(controller_mod.config, "MONITOR_CONTEXT", False)
+    assert ctrl._with_context("hello") == "hello"
+
+
+def test_screen_text_never_rides_along_automatically(monkeypatch, ctrl):
+    """The layout is free; the *contents* cost an OCR pass and a lot of
+    privacy, so they only ever move on an explicit petctl read."""
+    monkeypatch.setattr(controller_mod.config, "MONITOR_CONTEXT", True)
+    called = []
+    monkeypatch.setattr(
+        controller_mod.screen_text, "read_monitor", lambda *a, **k: called.append(1)
+    )
+    monkeypatch.setattr(
+        controller_mod.screen_text, "read_monitors", lambda *a, **k: called.append(1)
+    )
+    ctrl._with_context("hello")
+    assert called == []