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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is covered. The description adds only that technicians can optionally be attached and cites the REST endpoint; it says nothing about error behavior for missing crews, response shape, or whether expansion changes payload size.

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 compact sentences, front-loaded with the operation and scope. The trailing 'GET /crews/{id}' is mildly redundant with the name and schema but is a cheap, unambiguous anchor for an API-wrapper tool; nothing else is wasted.

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-record read with three fully documented parameters, annotations covering safety, and no output schema, the description supplies enough to call it correctly. The remaining gap is only what the response contains and how errors surface, which is minor at this complexity.

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 the schema itself documents crew_id, expand (enum 'techs'), and fields (comma-separated projection). The description echoes the expand behavior ('optionally with its technicians') but adds no syntax or constraint detail beyond what the schema already provides, so the 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 and resource ('one crew by id') plus the optional expansion ('with its technicians'), and the underlying endpoint GET /crews/{id} confirms the singular-lookup semantics. It implicitly separates itself from servicefusion_list_crews by saying 'one crew by id', but never names the sibling explicitly.

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?

Usage is only implied: 'by id' signals a single-record lookup versus the list tool, but there is no explicit when-to-use guidance, no statement about when to add the techs expansion versus calling a tech endpoint, and no prerequisites or error conditions (e.g., nonexistent id).

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