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

readOnlyHint=true already declares this is a safe read, so the safety burden is covered by annotations. The description adds the concrete REST path, which helps orient the agent, but discloses nothing about error behavior (e.g., 404 for missing repos), auth scope, or response shape. With annotations present, a 3 is appropriate.

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, front-loaded sentences with zero filler: purpose first, then the REST mapping. Every element earns its place.

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 straightforward read-only single-resource fetch with full schema coverage and a readOnlyHint, the definition covers what an agent needs to invoke it correctly. The lack of an output schema means return values are unexplained, but this is a minor gap for such a simple getter.

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 schema itself documents repo, owner, and the service enum with a default. The description adds no parameter meaning 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: 'Get a single repository's detail.' The word 'single' implicitly distinguishes it from the list_repos sibling, and the REST endpoint anchors the resource precisely. However, it never explicitly names or contrasts with siblings like codecov_list_repos or codecov_get_repo_config, so it stops short of a 5.

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 prerequisites (e.g., that the repo must exist or be accessible to the authenticated user), and no routing to alternatives such as codecov_list_repos or codecov_get_repo_config. The agent must infer usage entirely from the name and endpoint.

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