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

With no annotations, the description carries the full behavioral burden: it discloses the exactly-once settlement guarantee and the authorization requirement. It does not go into structural side effects or error cases, but the most important behavioral traits are explicit.

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?

Two dense sentences, no filler, and the core contract and precondition are front-loaded. Every clause earns its place.

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?

The description covers purpose, precondition, and exactly-once behavior, which is substantial for a simple three-parameter tool. However, with no output schema it omits response/error semantics and leaves expectedVersion's role ambiguous, so an agent might still need to guess on concurrency failures.

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 descriptions are 0% and the description must compensate. It gives meaning to the idempotencyKey via 'exactly once' and implies id is the offer identifier, but expectedVersion is left entirely unexplained. Two of three required parameters lack semantic guidance.

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 ('Accept'), resource ('sender-confirmed offer'), and contract ('settle exactly once'), clearly separating it from siblings like decline_offer and confirm_offer_recipient. This is more than a restatement of the name.

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 description provides a clear precondition ('caller must be its confirmed recipient') and implies the offer must already be sender-confirmed, giving context for when this tool applies. It does not explicitly name alternatives or say when not to use it, but the context is enough to route an agent.

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