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

Annotations already declare readOnlyHint=false, idempotentHint=false and destructiveHint=false, so the write/non-repeatable profile is covered. The description adds genuinely new context: the proof is time-boxed to 5 minutes and the caller must supply their key. It does not cover failure modes (expired nonce, wrong key), so a 4.

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, front-loaded with the triggering scenario followed by what is returned and what is required. The rhetorical opening question is slightly informal but sets context efficiently; nothing is padded.

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?

With no output schema, the description does carry return-value duty and it delivers: a PazAIr-signed holder proof over the agent id and nonce, valid 5 minutes. Only the audience parameter and failure/expiry behavior are left unaddressed, which is a minor gap for this simple two-parameter 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 coverage is 50%. The description explains where the required nonce comes from (another agent's check), which the bare string-typed schema does not. The optional audience parameter is only explained in the schema, not expanded on. 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?

The description states a specific verb and outcome: it 'returns a holder proof' where PazAIr 'signs your agent id with that nonce'. That is far more than a restatement of the name. It stops short of naming a sibling (e.g. check_word_pass / verify_pass), so it gets a 4 rather than a 5.

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 opening question grounds the trigger scenario clearly: use this when another agent checked your Word Pass and handed you a nonce. It gives the 'when' but no explicit when-not conditions or named alternatives, which keeps it out of 5 territory.

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