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

The description discloses that the tool can return a login link (when called with no args), and explains the difference between permanent (config header) and session-only authentication, which goes beyond the annotations. It does not conflict with the idempotentHint=true annotation; repeated calls with the same token should be safe. It also implies state change (authentication) consistent with readOnlyHint=false.

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 functional but slightly wordy, providing context about IDE agents (Cursor, etc.) that may not be essential. It could be more concise, but all sentences serve a purpose in explaining the authentication flow.

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?

For a simple one-parameter tool with no output schema, the description covers the key aspects: how to obtain the token, the two authentication modes, and the parameter usage. It does not describe the return value, but that is less critical here. The guidance is sufficient for an agent to invoke the tool correctly.

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 defines a single optional 'token' string with no description, but the description compensates by explaining what the token is ('<jwt>') and how to use it, as well as the behavior when omitted (returns a link). This adds sufficient meaning beyond the schema.

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: authenticating with MCP.AI by either returning a browser login link (no args) or accepting a JWT token for session login. It also mentions the alternative of adding the token to server config for a permanent connection. While it doesn't explicitly contrast with sibling 'connect', the verb 'authenticate' and the login context make the purpose clear.

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 gives explicit usage instructions: call with no args to get a login link, or with a token for session-only login, and recommends adding the token to the server config as an Authorization header for a permanent connection. It thus provides clear when-to-use guidance for the different invocation modes, though it doesn't discuss alternatives among sibling tools.

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