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Agent Guide — ep_ai_chat

AI pad participant for Etherpad: responds to @mentions in chat and edits pads.

Tech stack

  • Etherpad plugin framework (hooks declared in ep.json)
  • html10n for i18n (locales/<lang>.json, data-l10n-id in templates)

Project structure

ep_ai_chat/
├── AGENTS.md
├── CONTRIBUTING.md
├── chatHandler.js
├── contextBuilder.js
├── docs/
├── ep.json
├── i18n.js
├── index.js
├── locales/
│   ├── en.json
├── package.json
├── padEditor.js
├── static/
│   ├── js/
│   ├── tests/
├── suggestEdit.js
├── suggestionMode.js
├── surgicalDiff.js
├── test/

Helpers used

None — ep_plugin_helpers is not a dependency. Adoption is part of the helpers-adoption sweep (Phase 4).

Helpers NOT used

To be audited in the helpers-adoption sweep (Phase 4).

Running tests locally

ep_ai_chat runs inside Etherpad's test harness. From an etherpad checkout that has installed this plugin via pnpm run plugins i --path ../ep_ai_chat:

# Backend (Mocha) — harness boots its own server
pnpm --filter ep_etherpad-lite run test

# Playwright — needs `pnpm run dev` in a second terminal
pnpm --filter ep_etherpad-lite run test-ui

Standing rules for agent edits

  • PRs target main. Linear commits, no merge commits.
  • Every bug fix includes a regression test in the same commit.
  • All user-facing strings in locales/. No hardcoded English in templates.
  • No hardcoded aria-label on icon-only controls — etherpad's html10n auto-populates aria-label from the localized string when (a) the element has a data-l10n-id and (b) no author-supplied aria-label is present. Adding a hardcoded English aria-label blocks that and leaves it untranslated. (See etherpad-lite/src/static/js/vendors/html10n.ts:665-678.)
  • No nested interactive elements (no <button> inside <a>).
  • LLM/Agent contributions are explicitly welcomed by maintainers.

Quick reference: hooks declared in ep.json

  • Server: loadSettings, handleMessage, userJoin, socketio, clientVars
  • Client: postAceInit, chatSendMessage, chatPrefillFromUser

When adding a hook, register it in both ep.json and the matching exports.<hook> = ... in the JS file.