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

Beyond annotations, the description discloses polling behavior, one-time key return, and secure storage requirements. It does not describe rate-limit behavior or failure modes, but adds meaningful operational 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?

Three short sentences with zero waste, front-loading the prerequisite and polling cadence before the return value and storage instruction.

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 single-parameter polling tool with no output schema, the description covers prerequisite, cadence, termination, return behavior, and secure storage. Only edge-case behavior such as expiration or failure handling is missing.

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 coverage is 0% for the single device_code parameter. The description helpfully says where device_code comes from (start_signup), but does not explain its format, lifetime, or handling expectations beyond that origin.

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 makes clear this is the completion step for signup: call with device_code from start_signup until the user approves, then receive the key. It is specific about the resource and outcome, though the verb 'Call' is less precise than 'poll' or 'finish'.

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 explicitly says to use device_code from start_signup and to call every few seconds until approval, giving clear timing and termination guidance. It does not state what to do on expiration or errors, but the main usage context is well covered.

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