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

Beyond the annotations, the description discloses meaningful behavioral details: calling with no args returns a login link, calling with a token establishes a session-only login, and config-based auth is permanent/non-expiring. This is useful context, though it does not cover every edge case such as invalid tokens or response format.

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 compact and front-loaded with the tool's purpose, then explains the two usage modes. It is slightly dense and mixes configuration guidance with invocation instructions, but every sentence adds needed 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 authentication tool with one optional parameter and no output schema, the description provides enough context for an agent to invoke it correctly in both modes. It does not fully describe return values or error behavior, but the core workflow is well covered.

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 only defines an optional 'token' string with no description, so the description carries the load. It explains that the token is a JWT passed after the user pastes it, and that omitting it yields a login link. This adds real semantic value beyond the bare 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 identifies a login/authentication flow for MCP.AI in IDE agents, with specific actions (browser login, copy token, pass token or request link). It does not explicitly contrast with sibling tools like 'connect', so it misses the top score for 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 guidance on when to use the permanent config-header approach versus the session-only token approach, and explains no-args vs token invocation. It provides clear context but does not mention when not to use the tool or identify alternative sibling tools.

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