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

readOnlyHint=true already tells the agent this is a safe read; the description adds only the underlying REST endpoint (GET /v3/vendors/{id}), which is mild context. It does not disclose error behavior (e.g. 404 on unknown id) or the shape of the returned vendor, so it adds limited value beyond annotations.

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-loaded with the action and resource, with the endpoint as secondary detail. Nothing is redundant or padded.

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 simple single-id read with full schema coverage and a readOnly annotation, this is close to sufficient, but with no output schema the description could say a vendor object is returned or what to expect on a missing id. It is adequate but leaves those gaps.

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 100% for the single vendor_id parameter, so the schema already documents it fully. The description's 'by id' restates the same idea without adding format or source guidance, which matches the baseline-3 expectation when 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?

States a specific verb and resource ('Get one vendor by id'), and the singular 'one' implicitly distinguishes it from the sibling bookingkit_list_vendors. It does not explicitly name the sibling, but the retrieval-vs-list distinction is clear.

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 'by id' phrasing implies you must already have a vendor id, and 'one' hints that listing is a different tool, but no explicit when-to-use or alternative (e.g. list_vendors for discovery) is stated. Usage is inferable rather than spelled out.

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