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

With no annotations, the description carries the full disclosure burden. It does add real behavioral context — the challenge is a proof-of-work and expires in ten minutes — but says nothing about rate limits, cost of solving, re-request behavior, or what the returned challenge looks like.

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, zero filler, and the core action is front-loaded before the caveat about the secret. Every sentence carries information.

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 zero-parameter tool with no output schema or annotations, the description covers what the tool produces and its TTL. It still leaves the surrounding flow ambiguous — what to do with the challenge once received, and how it relates to verify_receipt or the submit tools.

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 zero parameters and schema coverage is 100%, so the baseline is 4. The description mentions a client-generated agent_secret, which is a workflow concept rather than a schema parameter, so it neither adds nor detracts from parameter documentation.

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 resource (get a proof-of-work challenge) and adds meaningful scope detail (ten-minute validity). It doesn't explicitly contrast with siblings like verify_receipt or check_status, but the purpose is unambiguous on its own.

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 'before submitting' implies this tool is a prerequisite step in a submit workflow, which is useful implied guidance. However, it never states when to use this versus alternatives such as verify_receipt, nor any when-not conditions, so the routing guidance is only inferred.

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