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

The description goes beyond the annotations by explaining the browser login flow, the 'Authorization: Bearer <token>' config approach, and that the token is optional and session-scoped when passed directly. It does not contradict the idempotentHint=true or other annotations, and it adds useful behavioral context despite the annotations already hinting at safety.

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 a compact three-sentence block with no filler. It front-loads the purpose and then lays out the two usage paths efficiently, though it is slightly dense and could be split into clearer steps.

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 simple schema and lack of output schema, the description covers the main behaviors and usage modes. It could mention what the tool returns after authentication or how errors are handled, but it is otherwise complete enough 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?

Schema coverage is 0%, so the description must explain the 'token' parameter, and it does: it specifies the parameter is a JWT, that it can be pasted for a session-only login, and that omitting it returns the login link. This compensates well for the sparse 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 explains that the tool authenticates to MCP.AI by either returning a browser login link or accepting a pasted JWT. It identifies the resource (MCP.AI) and the action (authentication), though it doesn't explicitly distinguish itself from sibling tools like 'connect'.

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 provides explicit usage guidance: users should prefer adding the token to the server config for a permanent connection, or call the tool with a token for session-only login, or call with no args to get the login link. This gives clear when-to-use instructions and describes the two main invocation patterns.

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