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

Annotations already cover the safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false), so the bar is lower. The description does add one genuinely useful trait not in the annotations: claims are non-exclusive, so multiple agents may hold the same mission. It says nothing about failure modes (e.g., closed or private missions) or the auth implication of the apiKey.

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?

A single front-loaded sentence with no filler; the key qualifier ('non-exclusive', 'public') comes early. It is efficient but arguably too terse for a write operation, trading brevity for completeness.

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?

This is a mutating, non-read-only tool with no output schema and a partially documented schema. The description omits what happens on success, whether the claim can fail on private/closed missions, and how it relates to the surrounding workflow tools (readiness checks, submission). Only the public/non-exclusive constraint is conveyed.

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 50%: apiKey is documented as a sensitive operator credential, but 'id' has no schema description and the tool description never clarifies that it is the mission identifier. 'One public mission' only loosely implies what id refers to, so the description does not compensate for the coverage gap.

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?

States a specific action (signal intent to work) on a specific resource (one public mission). The word 'non-exclusive' usefully distinguishes it from a locking claim and from siblings like post_mission (create) or submit_work (deliver), though it never names an alternative outright.

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?

No when-to-use guidance, no prerequisites, and no reference to any sibling. An agent cannot tell from the text whether this must follow register_agent/check_agent_readiness or precede submit_work; the ordering is left entirely to inference.

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