Agent Zero Plugin Development

Use this entrypoint to build or improve a plugin, review it, or prepare community contribution. For finding useful existing plugins and installing/updating them, use a0-manage-plugin.

Establish The Target

Honor an explicit local-only or community-contribution request. For a new plugin, if the user has not said which, ask once: "Should this stay local, or be prepared for community contribution?" Do not ask again when the answer is already in the conversation. For an existing plugin, inspect its location/repository and requested outcome; clarify only an unresolved distribution choice.

• Local: work in /a0/usr/plugins/<name>/. No public repository or Index submission needed.
• Community: develop and test locally, then prepare a standalone repository and a separate Plugin Index submission using references/contribute.md.
• Existing bundled plugin work: edit its tracked owner only when that is the requested task. New custom plugins do not belong in /a0/plugins/.

Required Lifecycle Contract

Plugin setup, dependency installation, required initialization, and uninstall cleanup MUST use lifecycle functions in the plugin-root hooks.py. Never put these operations in execute.py, and never require an Execute button or manual post-install command to make a plugin usable.

• install() prepares dependencies and initializes the plugin automatically after installation and again after updates. Make it safe to rerun.
• pre_update() stops plugin-owned processes or prepares state before an update when needed.
• uninstall() stops plugin-owned processes, removes registrations, and removes plugin-owned dependencies/resources before the framework deletes the plugin directory. Preserve shared dependencies and unrelated user data.
• Keep lifecycle ownership in hooks.py; it may delegate to plugin-local helpers. If boot-time initialization is needed, a startup extension may call the same helper or hook; it does not replace install/uninstall hooks.
• Omit execute.py unless there is a separate, explicitly requested manual operation unrelated to setup, dependency installation, required initialization, updates, or removal.

Read Only What The Task Needs

After loading this skill, use skills_tool with action: "read_file", skill_name: "a0-create-plugin", and the reference path:

Working Flow

1. Inspect the existing plugin and relevant source. Read /a0/AGENTS.md, /a0/plugins/AGENTS.md, and the closest applicable contracts.
2. Load the implementation reference, plus the UI reference if needed. Build only the requested capability; reuse existing helpers and patterns.
3. Keep plugin.yaml at the plugin root. Use stable underscore names for new custom plugins. Keep credentials and runtime state out of published source.
4. Verify the real target runtime, not just the checkout. Use the framework Python for backend/plugin checks. Read references/review.md before declaring the work complete; report actual checks and remaining limitations.
5. For local work, deliver the working plugin and usage instructions. For community work, continue through the contribution reference within the user's publication authorization. Preparing a plugin is not the same as publishing it or merging its Index PR.

Brief Troubleshooting

Follow the first failing boundary: root plugin.yaml and correct directory; global/project/profile toggle and effective config; imports in the framework runtime; API auth/CSRF and route; extension path/breakpoint; store import and gate. Inspect the relevant server/browser error before editing. Use management APIs for lifecycle refreshes; do not manually rerun install/uninstall hooks as a diagnostic or delete state to hide the failure.

Finish

Report the feature, usage, live verification, and any unresolved limits. For community work, distinguish repository publication, PR creation, CI results, and actual merge. Follow an existing request to commit or publish; otherwise keep changes ready for review.