Three tools with clear verb-noun naming and documented schemas. Descriptions are present but brief (10-50 chars), below the 50-200 char LLM-optimized baseline. All tools have input schemas with type constraints. Tool annotations (readOnlyHint, destructiveHint, idempotentHint) are correctly applied. However, parameter descriptions are minimal, and output schemas are not formally documented. Error handling is absent, tools return success messages but no guidance for failure cases. The server is in-process (no IPC boundary), which is architecturally sound but limits reusability.

• Expand tool descriptions to 50-200 chars. Example: 'set_status: Update the status line in the app header to report current progress. Use this to keep the user informed of long-running operations. Max 200 chars.'
• Document output schemas explicitly. Add a comment or JSDoc showing the structure returned by each tool, e.g., 'Returns: { content: [{ type: "text", text: string }] }'
• Add error handling with recovery guidance. Wrap state mutations in try-catch and return structured errors: 'Failed to set status: [reason]. Ensure the app state is initialized.'
• Enhance parameter descriptions with constraints and examples. E.g., 'text: Status message (1-200 chars, plain text only). Example: "Processing file.txt..."'
• Consider HTTP transport for remote accessibility. Even if the app remains in-process, expose the MCP server over HTTP+SSE or Streamable HTTP to enable hosted client integration.