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

With no annotations, the description carries the full burden of behavioral disclosure. It states the purpose but does not clarify whether the request is a safe read, what the challenge entails, or what the response contains. The action of 'requesting' is vague regarding side effects.

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?

The description is a single sentence that is reasonably concise and front-loaded with the primary action. However, the conditional phrase is slightly complex, but it still fits in one sentence without extra fluff.

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 tool with no parameters, no output schema, and no annotations, the description gives enough to understand when to invoke it, but it doesn't explain what the returned challenge looks like or any follow-up expectations. This is adequate but leaves gaps in fully understanding the tool's behavior.

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?

Since the tool has 0 parameters, the baseline is 4. The description does not need to explain parameter semantics, and no additional information is required.

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 clearly states the tool's function: 'Request a contribution challenge'. It uses a specific verb and object, and the context 'when AgentExchange asks you to contribute before consuming more machine-oriented resources' adds clarity. It is distinct from siblings which focus on questions/answers rather than challenges.

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 provides clear guidance on when to use this tool: 'when AgentExchange asks you to contribute before consuming more machine-oriented resources.' This implies a specific trigger scenario, though it does not explicitly list alternatives or when not to use it.

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