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

The description adds meaningful behavioral details beyond the annotations: the receipt is invalidated, a fifth claim makes the job failed, and stale receipts cause conflicts. This gives an agent crucial side-effect and edge-case information that annotations alone do not provide.

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 short sentences deliver distinct information: core action, failure threshold, and receipt lifecycle. The description is front-loaded and every sentence earns its place without filler.

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 mutating tool with an output schema and destructive annotations, the description covers the main preconditions and side effects: the job must be claimed, the worker needs the current receipt, receipt invalidation, and the fifth-claim failure. It does not spell out every error response, but the output schema and annotations cover part of that gap.

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?

With 0% schema description coverage, the description compensates by explaining the two least obvious parameters: the worker token acts as the credential and the receipt must be 'current', with stale receipts conflicting. queue_id and job_id are not elaborated, but their roles are largely self-evident from their names and the required-parameter context.

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 'Return a claimed job to pending', a specific verb and state transition that clearly identifies the tool's purpose. It also distinguishes this from siblings like claim_agent_queue_job and ack_agent_queue_job by specifying the release action and the required token/receipt.

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 intended usage is clear: a worker that previously claimed a job wants to return it to pending. It does not explicitly name alternatives or state when not to use it, but the state-transition language and sibling list make the context apparent without ambiguity.

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