This MCP server has severe definition quality gaps. Only 2 tools are defined, both with critically incomplete schemas and minimal descriptions. Tool definitions are inferred from client_example.py rather than being explicitly registered in the codebase. No input parameter descriptions are visible for either tool. The 'retrieve_documents' tool lacks parameter descriptions for 'query' and 'top_k'. The 'index_documents' tool lacks description for its 'directory' parameter. Neither tool has documented output schemas. No error handling guidance, no parameter validation rules, and no security consideration for what appears to be file system operations. The server uses FastAPI but does not expose explicit tool registration via MCP protocol handlers.

• Explicitly register tools in the MCP server code using MCP tool registration handlers (not inferred from example code). Each tool must be registered with name, description, and input schema.
• Add detailed descriptions (50-200 chars) to each tool explaining WHAT it does, WHEN to use it, and WHAT it returns. Current descriptions are too brief.
• Add descriptions to every input parameter. For 'retrieve_documents': describe what constitutes a valid 'query' (free text? keywords? natural language?), and document the range/meaning of 'top_k' (1-100?). For 'index_documents': specify valid directory paths, format expectations, and what happens if the directory is empty.
• Document complete output schemas for both tools. Specify fields returned, their types, and how downstream tools can use them. For 'retrieve_documents', clarify if it returns document IDs, content, scores, etc. For 'index_documents', clarify if it returns count of indexed docs, index file path, etc.
• Add input constraints: 'top_k must be an integer between 1 and 100'; 'directory must be a valid absolute or relative path to an existing directory'.
• Add error handling guidance: document common failure modes (query too broad, directory not found, insufficient permissions) and indicate which are retryable vs. fatal.
• For 'index_documents', add a dry_run parameter or explicit confirmation step, and document idempotency guarantees (is re-indexing the same directory safe? Does it deduplicate?)
• Add security documentation: specify that 'index_documents' requires write:filesystem permission and that 'retrieve_documents' requires read:documents permission.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry