complete_auth

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

Annotations provide openWorldHint (true). The description adds that the tool saves a refresh token, indicating state change. This adds value beyond annotations but does not detail other behaviors like side effects or persistence.

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?

Two concise sentences, perfectly front-loaded with the core action. No superfluous words.

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 an output schema exists (not shown but indicated in context signals), the description does not need to explain return values. It fully covers the required context for an auth completion 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?

Schema covers 100% of the parameter, but the description adds crucial context: the URL comes from the browser after completing get_auth_url. This goes beyond the schema's description of 'the full URL the browser landed on.'

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 the tool's purpose: finish sign-in by exchanging a redirect URL for a refresh token. It uses a specific verb+resource and distinctly differs from all sibling tools (e.g., get_auth_url).

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 explicitly says to call this after get_auth_url and with the URL the user pastes back, providing clear context and sequencing. No explicit when-not-to-use, but the context is sufficient.

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