sign_in

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

Annotations only declare not-read-only, open-world, and non-destructive. The description adds substantive behavior: it launches an external browser page, the user must complete Duo approval manually, and the server never handles the password. It does not say whether the call blocks until completion, what happens if the user is already signed in, or that success should be confirmed via compliance_status.

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 short sentences, front-loaded with the action and followed by the security-relevant constraint. Every clause carries information an agent needs; nothing is redundant.

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?

An output schema exists, so return values need no explanation, and the zero-parameter surface is simple. The one gap is the post-call workflow: nothing tells the agent how to verify that sign-in actually succeeded (the obvious route being the sibling compliance_status).

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 tool takes no parameters, so there is nothing for the description to disambiguate; the baseline for a zero-parameter tool applies. No misleading parameter hints are given.

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?

States a concrete verb and resource: opening Purdue's sign-in page in the user's browser. The Duo approval detail pins down exactly which authentication flow this is, so an agent can tell it apart from siblings like sign_out or compliance_status.

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 phrase 'so they can sign in and approve Duo themselves' establishes the context in which to call it: an interactive browser sign-in the agent cannot perform on the user's behalf. There is no explicit exclusion or pointer to a sibling (e.g., compliance_status to verify the result afterward), which keeps it below a 5.

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