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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered. The description adds no behavioral context beyond that—nothing about not-found behavior, required permissions, or the fact that it returns one record only.

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?

A single front-loaded sentence with no filler or redundancy. It earns its place, though it is arguably too terse to carry any routing or contextual value.

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 trivial single-parameter, read-only lookup with full schema coverage and rich annotations, no output schema, the description supplies enough for correct invocation. The only omission is guidance on alternative retrieval paths, which is minor for this tool's simplicity.

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% and the single 'id' parameter is documented as a UUID 'Project site ID'. The description's 'by ID' restates the schema rather than adding format or semantics, 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 ('Get') and resource ('project site assignment') plus the retrieval key ('by ID'), so the agent knows exactly what the tool returns. It does not explicitly contrast itself with the numerous sibling getters (get_project, get_site, get_vendor_site_assignment) or list_project_sites, so it falls short of full sibling differentiation.

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?

There is no when-to-use guidance, no prerequisite statement, and no pointer to the alternative list_project_sites for enumerating assignments. Only a weak implicit signal ('single' vs list) hints at usage, which is insufficient given the dense family of sibling tools.

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