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

Annotations mark it as a non-destructive, open-world mutation, and the description goes well beyond them: it explains the stamp it adds (name, date, time, comment), the approval-circulation prerequisite, the resulting Verified status, the per-call confirmation default, and the required API key scope. Rich behavioral context consistent with the annotations.

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?

Front-loaded with purpose and workflow mechanics, and most sentences carry distinct information. Minor redundancy between the confirmation-default note and the "confirm with the user before each call" warning keeps it from a 5.

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 tool with no output schema, the description compensates well: it discloses the resulting status, the gating conditions, and the confirmation/key requirements. Nothing needed to call it correctly 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 100%, so both parameters are already documented. The description adds only marginal meaning (that the comment is stored with the stamp), which the schema nearly conveys; baseline 3 is appropriate.

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 specific verb and resource ("Verify a purchase invoice in circulation") and scopes it to a particular workflow state. An agent can distinguish it from siblings like get_purchase_invoice or approve_purchase_invoice without opening the schema.

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?

Gives clear preconditions: works only where you are a named verifier and approval circulation is on. Also flags the confirm-before-each-call behavior and the ability to switch it off. It stops short of explicitly contrasting with the sibling approve tool, so a 4 rather than 5.

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