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

Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so the safety profile is covered. The description adds something annotations cannot: the required project_sites:write scope, which is directly actionable for an agent deciding whether the call can succeed. It stops short of saying what is destroyed beyond the link itself (e.g. whether child records at that site are affected).

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, zero filler, with the operation stated first and the prerequisite second. Nothing in it could be removed without losing 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 one-parameter delete with full annotation coverage and no output schema, the essentials are present. The gap is disambiguation: in an API containing delete_site, delete_project_location and delete_service_area_site, the description should state that this removes only the project-to-site association and that it is permanent, neither of which is addressed.

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 there is only one parameter (id, a UUID with an explicit pattern), so the schema fully documents the input. The description only echoes "by ID" without adding format or lookup guidance, which is the expected baseline when the schema does the work.

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 gives a specific verb and resource ("Remove a site from a project") plus the identifier used ("by ID"), which is far better than a restatement of the title. It does not, however, distinguish this from nearby siblings such as delete_site or delete_project_location, which an agent could plausibly confuse it with.

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 statement of when to use this versus alternatives, nor any warning about when removal is inappropriate. The only conditional information is the scope prerequisite, which is closer to an auth requirement than usage guidance. The implication that this is the delete counterpart of create_project_site must be inferred from the name.

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