fool-cardgame/docs/CODE_MODE_SETUP.md

Code Mode setup

The cocos-code-mode extension (in extensions/cocos-code-mode) runs an HTTP server inside the Cocos Creator editor and exposes scene, asset and inspector operations as UTCP tools. That is how the editor is driven from outside the UI — see CODE_MODE_TOOLS.md for the tool reference.

Prerequisites

• Cocos Creator 3.8.8 must be running with this project open. The tool server lives inside the editor process; if the editor is closed, there are no tools.
• The extension registers itself in ~/.utcp_config.json on startup.

The port changes on every editor restart

The server binds to 127.0.0.1 on an OS-assigned port, and rewrites ~/.utcp_config.json each time. Always read the config file rather than remembering a port:

cat ~/.utcp_config.json

Running a tool chain

Pass the config path via UTCP_CONFIG_FILE. The script body runs as an async function; tool calls look synchronous and return gives back the result.

UTCP_CONFIG_FILE="$USERPROFILE/.utcp_config.json" npx -y @utcp/code-mode-cli run <<'EOF'
const tree = CocosEditor.nodeGetTree({});
return { name: tree.name, children: (tree.children || []).map(c => c.name) };
EOF

Discover tools by task instead of guessing names:

UTCP_CONFIG_FILE="$USERPROFILE/.utcp_config.json" npx -y @utcp/code-mode-cli search "add a sprite to a node"

Working discipline

The tools are built around discover, then act:

1. nodeGetTree / assetGetTree — find the thing.
2. inspectorGetInstanceDefinition — get its real TypeScript class.
3. inspectorSetInstanceProperties — set properties by confirmed name.

inspectorSetInstanceProperties states it outright: if a property path or type has not been confirmed via an inspectorGet* call, do not call a setter. Property names differ from the engine docs often enough that guessing corrupts scenes.

Batch reads and writes into one run script — each npx invocation re-registers the manual, which costs a few seconds.

Regenerating the tool reference

After updating the extension:

curl -s "$(node -p "require(require('os').homedir()+'/.utcp_config.json').manual_call_templates[0].url")" -o manual.json
node docs/scripts/gen-tool-reference.js manual.json docs/CODE_MODE_TOOLS.md

Known issue: sharp / libvips conflict on Windows

Symptom. The editor logs The plug-in main process failed to load with either Could not load the "sharp" module using the win32-x64 runtime or TypeError: Cannot read properties of undefined (reading 'output') at node_modules/sharp/lib/utility.js. No ~/.utcp_config.json appears and no tools are reachable.

Cause. Two things stacked:

1. The released extension zip was packaged on macOS, so its bundled sharp ships only darwin-arm64 binaries.
2. More fundamentally, Cocos Creator already has its own sharp 0.32.6 (libvips 8.14) resident in the same process. On Windows a second libvips cannot be loaded beside the first, so the extension's sharp 0.34.x binds against the editor's older DLL. That DLL has no JPEG 2000 support, format.jp2k comes back undefined, and the module throws while initialising — taking the whole plugin with it.

Fix. asset-tools.js now loads sharp lazily, prefers the editor's own resident build under process.resourcesPath/app.asar.unpacked/node_modules/sharp, and tolerates it being unavailable. sharp is only a fast path for assetGetPreview, which already had a renderer-based fallback, so a missing image library no longer stops the tool server from starting.

That file is tracked by git, so the fix survives — but re-importing the extension from a release zip will overwrite it. If the extension is ever re-imported, re-apply the patch and, on Windows, also install the matching native binaries:

cd extensions/cocos-code-mode && npm install --no-save --os=win32 --cpu=x64 --include=optional sharp@0.34.5

(extensions/cocos-code-mode/node_modules is gitignored, so that install does not survive a clean checkout either.)

Known issue: the setter tools take arrays, not a single path

CODE_MODE_TOOLS.md is generated from the manual the extension serves, and for inspectorSetInstanceProperties / inspectorSetSettingsProperties that manual advertises a singular propertyPath + value pair. The implementation actually loaded (set-properties-tool.js) expects parallel arrays, and the singular form fails with the unhelpful Cannot read properties of undefined (reading 'length').

Use:

CocosEditor.inspectorSetSettingsProperties({
  settingsType: 'ProjectSettings',
  propertyPaths: ['general.designResolution.width', 'general.fitWidth'],
  values: [1080, true],
});