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

Annotations already declare destructive=true, idempotent=true and readOnly=false, so the safety profile is known. The description adds genuinely new behavior: retries are disambiguated by clientId plus an unchanged body, and the returned result carries no read attestation or human acceptance, which matters for a destructive operation.

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 compact sentences, front-loaded with the action and its scope before the parameter and return details. Dense with domain jargon but no filler sentences.

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?

It covers the retry model and the nature of the return value, which is useful given there is no output schema. It omits failure semantics for a destructive tool — stale fence, missing claim, revision conflict — and does not explain the nested command envelope beyond listing fields.

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 only 50% schema description coverage, the description must carry weight, and it does name which fields form the retry identity (clientId, baseRevision, purposeRevision, snapshotId). However it says nothing about fence, snapshotId, or purposeRevision semantics, and the schema's claimId description is copy-pasted from clientId ('identifying one operation'), leaving the claim identity ambiguous.

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 verb and resource: 'Releases the participant's own active claim by claimId and fence', which separates it from purpose_claim and purpose_renew. It does not explicitly distinguish it from purpose_done_for_now or purpose_cancel_check_back, which are the nearest ambiguous siblings.

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?

Usage is implied by 'own active claim' — you call it when you hold a claim you want to give up — but there is no explicit when-to-use/when-not guidance. Nothing tells the agent whether releasing differs from purpose_done_for_now or what to do if the claim has expired.

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