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

Goes well past the annotations: names the required approve scope, states the audit trail records the decider, and discloses a concrete failure mode (403 for sandbox keys from self-registration until a person claims the workspace). Annotations only say 'destructive, not idempotent'; the description tells the agent why state changes and what gates it.

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?

Front-loads purpose and the id source, then compresses permissions and preconditions into short clauses; nothing is redundant. The last two 'Needs a ...' sentences are slightly staccato but each carries distinct requirement information.

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?

Covers purpose, permissions, credential scope, workspace state, id provenance, and the follow-up call — essentially everything needed to invoke it safely with no output schema present. Only the response shape after approval is left unstated, a minor 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?

Schema coverage is 100% and both params are documented there, so the description only adds provenance for proposal_id ('the id from list_commerce_proposals'). That is useful routing context but does not extend the reason field or constrain formats further.

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 ('Approve a drafted price proposal') plus the state transition it causes ('so it can be pushed to the store'), which separates it cleanly from execute_commerce_proposals and reject_commerce_proposal.

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?

Explicitly says approving does not push the price and routes the agent to execute_commerce_proposals for that step, and names list_commerce_proposals as the source of the id. Preconditions (owner/trusted scope, Last Price credential, claimed workspace) are all spelled out.

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