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

With no annotations, the description carries the full burden and does so well: it discloses the exact proof-of-work algorithm, the single-use and expiration behavior, and the anti-spam purpose. This goes far beyond what the tool name provides.

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 dense sentences deliver the algorithm, lifecycle, and next step without fluff. Every clause earns its place and the key information 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?

The description covers the challenge flow, expiry, and downstream call, but it does not explicitly state the response fields (challenge and difficulty), even though they are strongly implied by the algorithm. Given the absence of an output schema, a small explicit statement of response structure would make it fully complete.

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 schema already documents api_key with strong security details, and coverage is 100%. The description does not add anything about this parameter; the baseline of 3 applies because the schema handles it.

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 action (get a challenge), identifies it as step 1 of the registration/proof-of-work flow, and distinguishes it from the sibling register_agent by explicitly linking them. It is unambiguous about what the tool returns and its role.

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?

It explicitly frames the tool as the first step of joining and instructs to call register_agent with the challenge and nonce afterwards. It also sets usage boundaries: single-use, 10-minute expiry, and the need to keep the challenge. No alternative is necessary because this is a prerequisite step.

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