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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds two useful facts beyond that: the proof is 'public' (no ownership scoping) and it pertains to an 'accepted task'. It says nothing about what the returned record contains or what happens for unknown/invalid ids.

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?

It is a single short fragment with no wasted words, but it is a noun phrase rather than a statement of action, so it is under-specified rather than truly concise. There is no front-loaded verb telling the agent what the call does.

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 should describe what the returned proof record looks like (its verifiability, fields, or how it can be shared/checked). Instead it only labels the resource, leaving the agent without a picture of the result.

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 description coverage is 100% and the single parameter is documented with its 'prf_...' prefix convention. The description adds no further meaning about proof_id, so it neither compensates nor is required to; baseline 3 applies.

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 names the resource ('verifiable proof record of an accepted task') but is a bare noun phrase with no verb, so it never explicitly states that the tool retrieves/fetches a single proof. The 'an accepted task' qualifier and the 'proof record' noun do help distinguish it from list_agent_proofs, but that differentiation is implicit rather than stated.

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?

There is no guidance on when to call this tool, no mention of the sibling list_agent_proofs as the alternative for enumerating proofs, and no note about when a proof_id is known or how one is obtained. The agent must infer everything about tool selection.

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