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

With no annotations, the description carries the full burden. It adds one useful caveat ('does not verify global external identity ownership'), but it does not disclose side effects, whether the operation is idempotent despite the idempotencyKey, what expectedVersion controls, or what the confirmation affects.

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 sentences with no filler, and the main purpose is stated first. The additional caveat is short and relevant.

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 operation with a nested recipient object, a required idempotencyKey, no annotations, and no output schema, this description is too thin. It would not enable an agent to construct a correct call confidently, especially around expectedVersion and idempotency behavior.

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 0%, so the description must compensate, but it only vaguely maps to 'id' and 'recipient'. It does not explain idempotencyKey or expectedVersion, both of which carry important semantics that an agent would need to call the tool correctly.

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 uses a clear verb and resource: 'confirms a specific offer's recipient.' It is distinguishable from siblings like accept_offer and decline_offer, though it does not explain what 'confirm' changes in the offer's state.

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 indicates the caller is 'the sender' and the target is a specific offer, but it gives no guidance on when to choose this over related tools like accept_offer or decline_offer, nor any prerequisites or exclusion conditions.

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