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

The description reveals two login flows and implies state changes (permanent vs session), but does not explicitly mention side effects or idempotency. However, annotations already indicate idempotentHint=true, so the description adds reasonable context.

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 somewhat verbose and uses conditional phrasing, which can be confusing. It could be more structured (e.g., bullet points) but is not excessively long.

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?

The description does not state what the tool returns after authentication. Since there is no output schema, this missing information is critical for understanding the tool's behavior.

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 'token' parameter is explained in context as the JWT access token, and it is clear that it is optional (since no args gets the link). The description covers the parameter's semantics despite the lack of schema documentation.

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 that the tool handles authentication for MCP.AI, explaining the login flow and token usage. It is distinct from sibling tools like connect or marketplace.

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 provides explicit guidance on two usage modes: permanent (add to config as header) and session-only (paste token), and explains how to initiate with no args to get the login link.

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