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

Annotations only declare readOnlyHint=false and idempotentHint=true; the description goes further by disclosing the active-claim requirement and clarifying that completion does not itself send messages or execute the request. 'Safe to repeat after successful completion' adds nuance to the idempotency hint. It stops short of describing what happens to the item or the resulting state transition.

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, with the core instruction front-loaded and each sentence contributing distinct information (timing, precondition, scope). No padding or redundancy.

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?

With annotations covering the safety/idempotency profile and an output schema handling return values, the description is nearly complete for a workflow-completion tool. It covers timing, precondition, and scope; only the post-completion state change and relationship to fail/release siblings is left implicit.

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 description coverage is 100%, so both item_id and outcome are already documented in the schema. The description's 'Record the outcome' alludes to the outcome field but adds no format, length, or semantics beyond what the schema already provides. Baseline 3 applies.

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 – recording the outcome of a completed inbox item – and the timing ('only after doing the requested work') pins it to the completion step of the agent.inbox workflow. It even differentiates scope ('Does not send messages or execute the request itself'), helping separate it from messaging/execution siblings. However, it never explicitly names the 'complete/finalize the item' action matching its own name, leaving a small inference gap.

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 gives a precondition ('Requires your active claim') and a timing cue ('only after doing the requested work'), which implies correct usage. But it names no alternatives among its many siblings (agent.inbox.fail, agent.inbox.release, agent.inbox.progress), so the agent must infer when to complete versus fail or release.

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