skills/create-plugin/references/extensions.md

# MCP Apps and Extensions

## Development

After installing a plugin, check that its tools are available. If they have not
appeared yet, retry briefly before reporting that installation is pending.

If the tools require a new task, offer to open one with the existing plugin and
create it only when authorized. Find the exact plugin reference and include
`[@Plugin name](plugin://<name>@<marketplace>)` in the task prompt to select it.
Carry over the user's request, source location, Site ID when applicable, and
remaining work. Check that the tools are available before claiming success.
Do not recreate the plugin or repeatedly open tasks to refresh its tools.