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

Adds behavioral context beyond annotations: permanent non-expiring connection vs session-only login, and how the token is passed. Does not contradict any annotation hints.

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?

Moderately sized, front-loaded with purpose. Every sentence adds value: describes the login flow, both methods, and how to call. No redundant phrasing.

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 an auth tool with one optional parameter and no output schema, the description covers the essential usage and behavioral options adequately. Minor gap: does not mention error cases or post-auth state, but sufficient for typical use.

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 has one 'token' property with 0% description coverage. Description compensates by explaining that token is optional, with or without providing it, and clarifies the two invocation modes.

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?

Clear verb+resource: authenticate to MCP.AI. Explains the login process (browser, copy token) and distinguishes itself from sibling tools by being the dedicated authentication endpoint.

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?

Provides two explicit usage scenarios: adding a permanent header to config or passing a session token. Does not mention alternatives or when not to use, but gives clear context for when to invoke.

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