This MCP server provides 4 tools for Gravitee API authentication onboarding. Tools have verb-noun naming (create_or_reuse_application, find_existing_application, pick_api_key_plan, subscribe_and_get_key) which is appropriate. All tools have non-empty descriptions (ranging 120-180 chars, within the 10-1024 baseline). However, there are significant gaps in schema quality: input parameters lack formal type constraints, range boundaries, and enum declarations. Parameter descriptions are present but terse (20-40 chars each), leaving LLMs to infer requirements. Error handling is present but generic (throws Error objects with API status codes rather than structured recovery guidance). No output schema documentation is visible, tools return JSON objects but their structure is not formally declared. The code demonstrates correct async/await patterns and proper API integration, but the MCP interface lacks the rigor expected for production agent tooling.

• Document output schemas for all tools. Example: create_or_reuse_application returns { app: { id: string, name: string, settings: { app?: { client_id: string } } }, existing: boolean }. Declare field types, required vs optional, and what downstream tools expect.
• Expand parameter descriptions to 60-100 chars per the 72-char baseline. Example: 'name' → 'Required. Application name (1-255 ASCII chars, must be unique per environment).' This provides format, length, and uniqueness constraints.
• Add enum or pattern constraints to ID parameters. Example: 'apiId' could note 'UUID format, e.g. 4984c004-... (obtain from the API list).' This reduces invalid hallucinations.
• Enhance error messages with recovery steps. Example: On 409 Conflict, return 'Application name already exists. Call find_existing_application(name) to reuse it, or choose a different name.' This guides LLM self-correction.
• Clarify state-modifying behavior in descriptions. Update create_or_reuse_application to: 'Creates a new Gravitee Application or returns an existing one by name. This tool modifies state, idempotent on repeated calls with the same name and description.' Update subscribe_and_get_key similarly.
• Add tool-chain hints. Example: subscribe_and_get_key description could note 'Requires an application_id from create_or_reuse_application and a planId from pick_api_key_plan. Call those tools first.' This guides multi-step planning.
• Document the auto-selection logic in pick_api_key_plan. Clarify: 'If planArg is omitted, automatically selects the first API_KEY-type plan. If no such plan exists, throws an error with available plans, pass --plan explicitly to override.' This eliminates surprise behavior.