CERN GitLab MCP Server

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so description carries full burden. Discloses return payload contents (version, auth status, health) which compensates for missing output schema, but omits safety profile (read-only/destructive), error conditions, or side effects.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two efficient sentences with zero waste. Front-loaded with action (test connectivity), followed by return value disclosure. Every word earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Adequately complete for a simple diagnostic tool with no parameters. Effectively compensates for absent output schema by documenting the three return value categories. Would need explicit usage timing (when to call) to achieve 5.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Zero parameters present. With 100% schema coverage (trivially) and no parameters to describe, meets baseline of 4.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

Specific verb 'Test connectivity' and resource 'CERN GitLab instance' clearly define scope. Explicitly distinguishes from operational siblings (get_, list_, search_ tools) by being a diagnostic/health-check tool rather than data retrieval.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Implies usage pattern (checking connection health before operations) by describing return values (auth status, health), but lacks explicit guidance like 'use this first to verify connectivity' or 'call when experiencing connection errors'.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.