Server has 3 tools with clearly visible definitions in mcp_server.py. All tools have descriptions (10-20 chars minimum met), action-verb naming (list_, analyze_, create_), and documented input schemas with types. However, descriptions are brief and lack context about WHEN to use each tool or what the LLM should do with results. Parameter descriptions are present but minimal. Output schemas are not documented, the rubric requires documentation of return types for A-grade tools, and none is provided in the visible source. Error handling guidance is absent. Security posture is reasonable (read-only operations on 2 tools, write operation on 1 gated by name validation) but not explicitly documented in tool metadata. Tool composition is adequate, each has a single responsibility, but lacks downstream references needed for chaining (e.g., analyze_extension should return extension metadata that feeds into create_extension_template). The server uses fastmcp (Python framework), which handles registration internally; tools are not explicitly visible as decorators in the excerpt, lowering confidence in completeness of schema validation. Overall: solid foundation, but descriptions lack LLM-targeting language, output schemas undocumented, and error paths not guided.

• Add documented output schemas for all 3 tools. Example for list_extensions: 'Returns {extensions: [{name: string, category: string, description: string}], total_count: integer}'. This is critical for LLM planning.
• Expand tool descriptions to 50-150 chars following pattern:tool-description. Example: 'List all extensions in the RTX Remix repository, optionally filtered by category (lightspeed or flux). Call this first to discover available extensions before analyzing details.'
• Add constraint details to parameter descriptions. E.g., 'Name of the extension to analyze (e.g., lightspeed.myfeature, case-sensitive, must match entries from list_extensions).'
• Add recovery guidance to analyze_extension description: 'If extension not found, call list_extensions() to confirm the exact name and category.'
• Add confirmation pattern to create_extension_template: include a 'dry_run' boolean parameter (default false) to preview the template structure before writing to disk. Document: 'Set dry_run=true to preview template structure without creating files.'
• Document tool chaining in description text. E.g., analyze_extension could note: 'Returns full extension metadata including structure, which can be used as a template reference for create_extension_template.'
• Add error classification to descriptions. E.g., 'Raises USER_FIXABLE error if extension_name format is invalid; RETRYABLE if filesystem is locked; NOT_FOUND if extension does not exist in repository.'