cao-mcp-apps

# CAO MCP Apps Operator + developer playbook for CAO's host-rendered fleet UI. Reference docs: [`docs/mcp-apps.md`](../../docs/mcp-apps.md); example: [`examples/mcp-apps/`](../../examples/mcp-apps/). **Authoritative spec & sources of truth:** [MCP Apps Overview](https://modelcontextprotocol.io/extensions/apps/overview) · [Build an MCP App](https://modelcontextprotocol.io/extensions/apps/build) · [capability negotiation](https://modelcontextprotocol.io/extensions/overview#negotiation) · [client matrix](https://modelcontextprotocol.io/extensions/client-matrix) · stable spec [`2026-01-26/apps.mdx`](https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/2026-01-26/apps.mdx) (SEP-1865, Status: Stable) · SDK [`@modelcontextprotocol/ext-apps`](https://www.npmjs.com/package/@modelcontextprotocol/ext-apps) v1.7.4 ([API ref](https://apps.extensions.modelcontextprotocol.io/api/index.html) · [repo](https://github.com/modelcontextprotocol/ext-apps)) · provenance [PR #1865](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/1865). ## Turn it on The surface is **default-off**. Enable and run: ```bash export CAO_MCP_APPS_ENABLED=true uv run cao-server # :9889 (REST + SSE /events) uv run cao-mcp-server # registers tools/resources via the mcp_apps plugin ``` It is packaged as the built-in `mcp_apps` plugin (`cao.plugins` entry-point). The plugin's `on_mcp_server` hook registers the `ui://cao/*` resources, the five app tools, the topology widget,...