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

Adds real context beyond the annotations: the required scope (bookings:write), the fact that the first call is non-mutating, that unknown fields are refused by name, and that confirmation must be gated on human agreement. It does not disclose post-accept side effects (calendar entries, notifications, downstream booking state), which matters for a non-idempotent, open-world write.

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?

Purpose is front-loaded in the first sentence, then the permission, then the two-phase protocol — a logical ordering with no filler. The parenthetical about refused fields is dense but earns its place by explaining what the dry-run checks.

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 3-parameter mutation with no output schema, the description usefully covers the first call's return (summary plus confirm_token) and the auth requirement. It leaves open what the second call actually changes and what the caller gets back, which is the main gap for a non-idempotent write.

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 67% and the two optional parameters are already documented there, including the precondition_failed behavior for expected_updated_at. The description reinforces the confirm_token flow ("same arguments plus confirm_token") but adds nothing about proposal_id, the one required parameter.

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?

"Accept a request" states a specific verb and resource, and the two-call protocol clarifies what accepting entails operationally. It stops short of naming the sibling it is the counterpart of (decline_request), so the agent must infer the pairing from the sibling list.

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?

Strong procedural guidance: make the first call, show the summary to the person, and only call again with confirm_token once they agree. What is missing is sibling routing — nothing says when to prefer decline_request or preview_booking_request over this tool.

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