This server auto-generates MCP tool definitions from Protobuf service definitions. The generated tools (CreateUser, UpdateUser, GetUser) have explicit schemas and descriptions extracted from proto metadata. However, the descriptions are minimal (copying proto field documentation word-for-word rather than LLM-optimized guidance), parameter descriptions are trivial ("Field name", "Field email"), and critical LLM-facing details are missing. The schema is present but incomplete: no explanation of state modification semantics, no error recovery guidance, no idempotence guarantees, and no composite operation support. The generator does not emit tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite having risk metadata available (WRITE vs READ_ONLY marked in tools). No parameter constraints (enums, ranges, patterns) are enforced even when the proto likely defines them. Parameter descriptions do not clarify what happens on failure, what preconditions must hold, or how the tools compose. The tool interface matches the proto RPC exactly rather than being adapted for chat interaction (e.g., UpdateUser requires both 'id' and 'roles' as required fields despite 'roles' being optional in the proto). This is a code-generation tool that produces structurally valid but semantically weak MCP definitions.

• Enhance parameter descriptions to 50 - 100 chars with actionable constraints. Example: 'email' → 'Valid email address (RFC 5322 format); used for notifications and login'
• Add tool descriptions explaining WHEN to use each operation and WHAT side effects occur. Example for CreateUser: 'Creates a new user and returns the generated UUID. Use this after verifying the email is not already registered. Returns 201 Created on success; returns 409 Conflict if email exists.'
• Emit tool annotations reflecting risk metadata: mark UpdateUser and CreateUser with destructiveHint=true; mark GetUser with readOnlyHint=true.
• Document output schemas for all tools. Include the response structure (e.g., CreateUser returns {user: {id, name, email, roles, status}}).
• Fix the 'roles' parameter type from 'string' to 'array' (or 'string[]' if using OpenAPI format) to match the server implementation.
• Add optional alternate parameters: GetUser should accept user_name or user_email alongside user_id to avoid forced lookups.
• Add error recovery guidance to tool descriptions: 'GetUser returns 404 with message "User not found" if the id does not exist. Try searching by email or name.'
• Implement the read_resource() stub to return User resource schemas or examples, enabling resource-driven workflows.
• Add parameter validation rules in descriptions: 'name: 1 - 100 characters, alphanumeric + spaces; email: must be RFC 5322 compliant; roles: one or more of [admin, user, guest]' (if roles are enum values).

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

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