complete_sign_in

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

With no annotations, the description carries the full burden. It discloses key side effects: saving the session, cookies staying in a local browser profile, and closing the login window. It does not mention error conditions or idempotency, but the main behavior is transparent for a simple completion action.

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 with no wasted words. The most important trigger condition ('Call after the user says they finished logging in') is front-loaded, followed by specific side effects.

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 tool is simple and the output schema exists, so return values are covered. However, the required 'name' parameter is a meaningful gap, and there is no guidance on when not to use it or how it relates to sign_in. Acceptable for a minimal tool but not fully complete.

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 required parameter 'name' is completely unexplained in both the description and the schema (0% schema_description_coverage). The agent has no way to know what value to supply. With low schema coverage, the description was obligated to compensate and did not.

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 a specific action with a timing trigger ('after the user says they finished logging in') and concrete outcomes ('Saves the session... closes the login window'). It distinguishes itself from siblings like sign_in (which presumably initiates the login) by focusing on the completion step.

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?

Explicitly says when to use the tool: after the user says they finished logging in. It does not name alternatives or exclusions, but the trigger condition provides clear contextual usage guidance.

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