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

With no annotations provided, the description carries the full behavioral disclosure burden. It explicitly reveals the call has no side effects (no booking, no charge) and that payment/account creation happens externally on match-fit.net. This is the most critical behavioral trait for an agent to know, and it is stated clearly.

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 short sentences front-load the primary action and then add essential scope clarification. There is no redundancy, and each sentence contributes distinct 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?

For a single-parameter, side-effect-free link fetcher, the description gives the essential context: purpose, external dependency, and lack of side effects. The only minor gap is the exact shape of the returned link or response payload, but the absence of an output schema makes this less critical.

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?

The schema coverage is 100%, and the only parameter coach_id is already well-described as 'Coach username from mf_search_coaches'. The description adds no further parameter-level detail, so the baseline 3 is appropriate since the schema does the heavy lifting.

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 opens with a specific verb and resource ('Get the link to book a Match Fit coach'), immediately conveying the tool's purpose. It further disambiguates the scope by stating that nothing is booked or charged, separating it from reservation and ordering siblings even without naming them.

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 clearly implies when to use the tool: when a booking link for a specific coach is needed. It also provides a clear boundary ('nothing is booked or charged by this call'), which tells the agent not to expect this call to complete a transaction. However, it does not explicitly name alternative tools such as mf_search_coaches for prerequisite steps.

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