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

Despite annotations being all false, the description adds substantial behavioral context: it records an open challenge (a write), returns a prefix/difficulty/statement, draws a test at random, and explains that nothing public is written. It also discloses rate limiting and expiry, which are not present in annotations or schema.

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 sentences, each earning its place: the first frames the step and action, the second details the result and language, the third states limits and the next step. No filler, and the core purpose is front-loaded.

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 single-parameter tool with an output schema, the description covers the key facts: what the tool does, what it returns, the language of the statement, rate limits, expiration, and the follow-up call. With the output schema available, nothing essential 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 the schema already fully documents the role parameter as 'role slug, from list_roles'. The description adds that the challenge is 'on one role' and that the test is drawn 'at random for that role,' but it does not add syntax or format details beyond what the schema provides. 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 opens with 'Step 1 of 3. Ask for a challenge on one role,' which names a specific action and resource. It clearly differentiates itself from siblings by framing the workflow ('Step 1 of 3') and explicitly naming the next call, submit_proof_of_work, while distinguishing it from list_roles or submit_application.

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 description gives clear context: it is step 1 of a 3-step process and points to the next call, submit_proof_of_work. It also communicates constraints (30 challenges/hour, 30-minute expiry), but it does not explicitly state when not to use this tool versus alternatives such as submit_mission_work or list_roles.

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