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

With no annotations, the description carries the full behavioral burden. It usefully discloses the access-control model (owner and members only), which an annotation-free schema would not convey, but says nothing about ordering, pagination, or what happens for a non-member caller; a read-only list tool needs less, but the coverage is partial.

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?

One compact sentence with the resource named first, the return fields in a compact parenthetical, and the access/workflow note last. Every clause earns its place and nothing is 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 low-complexity, single-parameter list tool with an output schema present, the description covers purpose, access conditions, and the follow-up call, which is everything an agent needs. Return-value detail is already handled by the output schema, so the inline field list is extra rather than missing.

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 0% for the single project_id parameter, so the description is the only source of param meaning. It implicitly scopes the call to "a project" but adds no format or identifier detail, so the schema-plus-description pair leaves the parameter only self-evidently interpretable.

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+resource ("List a project's review rounds") and enumerates the returned fields (id/round_number/status/created_at), so the agent knows exactly what comes back. It does not explicitly contrast with siblings like list_comments, only points to it as a follow-up, 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?

Gives a real precondition ("Visible to the project owner and project members") plus an explicit next step ("use list_comments with a round id"), which tells the agent how this tool fits into a workflow. It stops short of saying when this tool is preferable to an alternative retrieval path, so it is clear context rather than full when/when-not guidance.

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