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

Goes well past the annotations: the agreed time persists until the owner confirms, exactly one email with Confirm/Keep buttons is sent, the resulting status values are named, and it states nothing changes on the website and nothing is paid. Also adds a security rule about only using user-supplied parameters, which annotations do not cover.

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-loaded with the core purpose and status constraint, then behavior, then safety notes. Dense but every sentence carries a distinct constraint; the security sentences are slightly redundant with the schema's user_confirmed text.

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 mutation tool with no output schema, the description covers preconditions, side effects, status transitions, and confirmation requirements, so an agent has everything needed to call it correctly.

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 requestId, note, preferred_time and user_confirmed are already documented. The description reinforces the meaning of user_confirmed and its 'confirm' alias but adds no new format or syntax detail beyond the schema, so 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?

States a specific verb+resource ('ask for a different time on a request the owner already agreed to') and immediately scopes it by pre-existing state, which cleanly separates it from siblings like cancel_request and respond_to_quote.

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?

Gives explicit when-to-use conditions (request_status 'accepted' or 'booked'), an explicit when-not ('Other states cannot be moved'), and a precondition ('Ask the user first; without user_confirmed nothing is sent').

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