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

The description discloses important behavior beyond annotations: it explains permanent vs session-only login mechanisms, and that calling with no args returns a link. It does not contradict the idempotentHint annotation. It could further mention the invocation response format, but the core auth behavior is transparent.

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 moderately long but front-loads the purpose and covers login flow, token format, and an alternative setup in a concise way. The reference to 'MCP.AI' as a platform/organization is the opening and adds a little context, but does not waste much space.

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 there is no output schema and one optional parameter, the description adequately covers flow, input format, and outcome ('get the link'). It could mention the output shape or failure conditions, but it is largely self-contained for selecting and invoking the tool.

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 lists 'token' as a string with no description, and schema description coverage is 0%. However, the description fully compensates by explaining what to pass: { token: '<jwt>' } for session login, and no args for obtaining the link. This adds the necessary semantic meaning for the single parameter.

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 tool as an authentication flow: it logs in in the browser, provides an access token, or accepts a pasted token. It distinguishes its behavior by explaining invitation/credential handling, but it does not explicitly contrast with sibling 'connect' or others, so it lacks full sibling differentiation.

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 invocation guidance: call with no args to get the link, or call with { token: '<jwt>' } after the user pastes. It also suggests a permanent alternative via server config, which acts as a conditional 'when not to use this tool' instruction, though it does not mention all sibling alternatives.

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