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

Beyond the annotations, the description reveals that this tool triggers browser login, can return a link when called with no arguments, and supports both session-only and permanent token-based authentication. It also clarifies the token must be a JWT. No contradiction with the readOnlyHint or idempotentHint annotations.

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 dense but reasonably concise, with the purpose stated first and the two usage modes clearly separated. It could be slightly cleaner, but every sentence adds necessary information.

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 auth tool with no output schema, the description covers the core flows: browser login, link retrieval, session token, and permanent config. It does not specify the exact response format or error behavior, but it is sufficient for an agent to invoke it 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 schema only defines 'token' as an optional string, but the description explains it is a JWT, that omitting it returns the login link, and that including it enables session-only login. This fully compensates for the 0% schema description coverage.

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 identifies the operation as logging in to MCP.AI and obtaining an access token, with a browser-based flow. It is specific about the resource, but it does not differentiate itself from sibling tools such as 'connect' or otherwise state what makes this tool the right one.

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?

It gives concrete usage guidance: no arguments returns the login link, passing a token performs session-only login, and adding the Authorization header to config creates a permanent connection. It does not explicitly contrast this tool with alternatives or state when not to use it.

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