customize-capability

# Customize Capability Modify a capability that is already installed in this workspace. The most common request is giving it an **MCP server** so its agent gains new tools, but the same flow covers adding skills, integrations, or guidance. A capability's source of truth is its manifest at `capabilities/<capability-id>/capability.yaml`. Re-installing reads that manifest and upserts the capability — re-install IS the update mechanism, and it never creates a duplicate. ## Workflow 1. Identify the capability id from the user's request. 2. Read the current state: - If `capabilities/<capability-id>/capability.yaml` exists, edit it in place. - If it does NOT exist (the capability was installed from the catalog), create it. Reconstruct the existing config first so nothing is dropped: keep the capability's current skills (as `ref`), its integrations, and its `agent_prompt`, then add your change on top. 3. Apply the change (see "Adding an MCP server" for the common case). 4. Call the `capability_install` tool with `capability_id: <capability-id>`. It re-reads the manifest and upserts the capability. A malformed manifest is rejected with a precise error — fix and retry. 5. Tell the user the change takes effect on the **next** agent run: the runtime compiles MCP servers at run start, so the current run won't see the new tools. Ask them to send a new message to pick them up. ## Adding an MCP server Add an `mcp:` block to the manifest. Each server conn...