Gmail MCP Server

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

No annotations are provided, so the description carries the full burden. It discloses that the tool initiates an OAuth2 flow and returns an authorization URL, which is useful behavioral context. However, it lacks details on error handling, rate limits, or security implications, leaving gaps for a tool handling authentication.

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?

The description is front-loaded with the core purpose in the first sentence, followed by a concise 'Returns' section. It uses minimal words effectively, with no redundant information, making it highly efficient and well-structured.

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?

Given the complexity of OAuth2 authentication and no annotations or output schema, the description is moderately complete. It explains what the tool does and the return value, but lacks details on integration steps, error cases, or how it fits with sibling tools like 'process_auth_code_tool', leaving room for improvement.

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?

The input schema has 0 parameters with 100% coverage, so no parameter documentation is needed. The description doesn't add param info beyond the schema, but this is acceptable given the lack of parameters, aligning with the baseline for 0 params.

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?

The description clearly states the tool's purpose: 'Initiate the OAuth2 flow by providing a link to the Google authorization page.' It specifies the action (initiate OAuth2 flow) and resource (Google authorization page), though it doesn't explicitly distinguish it from sibling tools like 'process_auth_code_tool' or 'check_auth_status'.

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?

The description implies usage by mentioning OAuth2 flow initiation, suggesting it's for authentication setup. However, it doesn't provide explicit guidance on when to use this tool versus alternatives like 'process_auth_code_tool' or 'authenticate', nor does it specify prerequisites or exclusions.

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