eggs

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Spawn, stop, change state, or manage a standalone animated 2D desktop sprite companion. Use when the user invokes `/eggs`, asks for an animated desktop companion, wants a roaming sprite character, or asks to stop/status/restart/change the companion process.

20installs

Sourcelarchliu/eggs

Added on2026-05-02

NPX Install

npx skill4agent add larchliu/eggs eggs

SKILL.md Content

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Eggs

Quick Start

When the user asks to spawn the desktop companion, including

/eggs

, run the bundled runtime from this skill directory:

bash

python3 scripts/egg_desktop.py start

When the user asks to stop it:

bash

python3 scripts/egg_desktop.py stop

For status:

bash

python3 scripts/egg_desktop.py status

For restart:

bash

python3 scripts/egg_desktop.py restart

Remote interaction is opt-in. To connect this skill to a separately deployed remote sprite server:

bash

python3 scripts/egg_desktop.py remote server http://localhost:8787
python3 scripts/egg_desktop.py remote upload dino
python3 scripts/egg_desktop.py remote
python3 scripts/egg_desktop.py remote status

remote

joins the server-side random waiting pool by default (equivalent to

remote random

). After a match is found, the server creates a temporary private room for that pair.

For invite rooms:

bash

python3 scripts/egg_desktop.py remote room ABC123

To leave:

bash

python3 scripts/egg_desktop.py remote leave

For state changes:

bash

python3 scripts/egg_desktop.py state unborn
python3 scripts/egg_desktop.py state ready
python3 scripts/egg_desktop.py state hatching
python3 scripts/egg_desktop.py state hatched
python3 scripts/egg_desktop.py state walk
python3 scripts/egg_desktop.py state sleep
python3 scripts/egg_desktop.py state eat
python3 scripts/egg_desktop.py state drink
python3 scripts/egg_desktop.py state play
python3 scripts/egg_desktop.py state roar
python3 scripts/egg_desktop.py state attack

To install a replacement spritesheet:

bash

python3 scripts/egg_desktop.py spritesheet /path/to/dino.png dino
python3 scripts/egg_desktop.py restart

Sprite Tools

Use the bundled Swift tools in

tools/

when asked to process, extract, validate, or merge desktop companion sprite sheets. When tools are run with

--name <sprite>

, they write

<sprite>.png

and

<sprite>.json

to the requested output directory and also install copies to

~/.codex/eggs/<sprite>.png

and

~/.codex/eggs/<sprite>.json

. If extraction is run without

--name

, use the input image stem and write

<input-name>_spritesheet.png/json

Build tools into a temporary location instead of committing platform-specific binaries:

bash

mkdir -p .swift-module-cache
CLANG_MODULE_CACHE_PATH="$PWD/.swift-module-cache" \
swiftc -module-cache-path "$PWD/.swift-module-cache" \
  eggs/tools/extract_sprite.swift \
  -o /tmp/extract_sprite

Extract a bordered grid:

bash

/tmp/extract_sprite <input.png> <output-dir> --prefix <name>

Extract a borderless regular grid:

bash

/tmp/extract_sprite <input.png> <output-dir> \
  --grid uniform \
  --columns <n> \
  --rows <n> \
  --prefix <name>

Force multiple source sheets into a common frame canvas:

bash

/tmp/extract_sprite <input.png> <output-dir> --frame-size 251 --prefix <name>

Merge extracted sheets vertically:

bash

CLANG_MODULE_CACHE_PATH="$PWD/.swift-module-cache" \
swiftc -module-cache-path "$PWD/.swift-module-cache" \
  eggs/tools/merge_spritesheets.swift \
  -o /tmp/merge_spritesheets

/tmp/merge_spritesheets <output-dir> [--name <sprite>] <sheet-a.json> <sheet-b.json>

Validation helpers:

bash

swiftc eggs/tools/check_sprite.swift -o /tmp/check_sprite
swiftc eggs/tools/bounds_sprite.swift -o /tmp/bounds_sprite

Runtime Behavior

Use only the bundled
```
scripts/egg_desktop.py
```
; it has no third-party Python dependencies.
On macOS, the manager compiles and launches the bundled native Swift/Cocoa overlay at first run. This requires
```
python3
```
and the macOS Swift compiler, but no npm, Electron, PyPI packages, or external assets.
When remote interaction is enabled, the Swift runtime remains the display runtime. A separate Python sidecar handles remote WebSocket sync and writes
```
~/.codex/eggs/remote-peers.json
```
for Swift to render remote peers.
On non-macOS, the manager falls back to its Python/Tk runtime. If Tkinter is unavailable, report that the local Python build cannot display the fallback GUI.
The script launches a detached local GUI process and stores its PID/log under
```
~/.codex/eggs/
```
.
Re-running
```
start
```
should not create duplicates; use
```
restart
```
when the user wants a fresh companion.
The runtime reads the current sprite and state from
```
~/.codex/eggs/state.json
```
.
The runtime reads optional user animation names from
```
~/.codex/eggs/config.json
```
under
```
animations.<sprite>.<name>
```
, where each animation object uses
```
row
```
and
```
loop
```
.
The runtime first looks for a user-installed sprite at
```
~/.codex/eggs/<sprite>.png
```
with optional
```
~/.codex/eggs/<sprite>.json
```
, then bundled skill assets at
```
assets/<sprite>.png
```
and
```
assets/<sprite>.json
```
, then falls back to a simple procedural placeholder drawing.
Resolve bundled assets relative to this installed skill directory; never rely on the original repo path or any
```
/Users/...
```
absolute path.
Do not hardcode the frame size. The animation runtime reads
```
frameWidth
```
and
```
frameHeight
```
from
```
<sprite>.json
```
to slice the PNG and size the desktop window. It only falls back to 251x251 if metadata is missing or invalid.
The bundled spritesheet currently has 251x251 frames in a 5x11 regular grid.
```
assets/dino.json
```
keeps
```
image
```
as
```
dino.png
```
, relative to the JSON file's own directory. Generated sprite metadata should stay portable in the same way.

Without custom config, each row is a state:

unborn

ready

hatching

hatched

walk

sleep

eat

drink

play

roar

attack

With custom config, accept animation names from

config.json

, for example

"idle": { "row": 3, "loop": true }

"attackOnce": { "row": 10, "loop": false }

, or

"roar3": { "row": 9, "loop": 3 }

Chinese state requests are supported through aliases such as
```
睡觉
```
,
```
吃鸡腿
```
,
```
喝水
```
,
```
玩耍
```
,
```
咆哮
```
, and
```
攻击
```
.
The
```
state
```
and
```
sprite
```
commands write
```
~/.codex/eggs/state.json
```
; running windows poll it and switch animation rows or sprite assets without restarting.
The desktop window can be repositioned by dragging it with the mouse.
Remote settings are stored in
```
~/.codex/eggs/remote.json
```
, anonymous device identity in
```
~/.codex/eggs/client.json
```
, and downloaded remote peer indexes in
```
~/.codex/eggs/remote/<peer_id>/
```
with shared blob files under
```
~/.codex/eggs/remote/blobs/
```
. Remote cache never overwrites local
```
<sprite>.png/json
```
.
Remote upload remembers the selected sprite name, and room/random interaction uses
```
device_id + sprite name
```
for the live WebSocket session rather than resolving peers through the public sprite detail endpoint.
The remote Go server is not part of the installed skill; it lives at the repository root under
```
server/
```
and should be deployed separately.
Sprite preparation tools are bundled under
```
tools/
```
; do not rely on old root-level compiled binaries.

Notes For Codex

If the user types

/eggs

or asks to spawn the companion, do the start action immediately and briefly report whether it launched. If the user asks to change companion state, run the

state

command with the closest matching state name. Do not open or explain the script unless launch fails.

eggs

NPX Install

Tags

SKILL.md Content

Eggs

Quick Start

Sprite Tools

Runtime Behavior

Notes For Codex