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

Annotations already declare readOnlyHint=true, so the safety profile is covered. The description adds the underlying REST endpoint (GET /{service}/{owner_username}/repos/{repo_name}/commits/), which is genuinely useful context for an agent, but it says nothing about pagination behavior or result ordering despite page/pageSize parameters.

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 tight sentences with the core action front-loaded and the endpoint mapping appended as supporting detail; nothing is wasted and nothing needs to be read twice.

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 read-only list tool with full schema coverage and no output schema, the description says enough to call it correctly; the only gap is pagination/traversal behavior, which the schema partially implies via page and pageSize.

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 all six parameters (owner, repo, branch, service, page, pageSize) are documented in the schema itself, so the baseline of 3 applies. The description confirms the branch filter but adds no format or default detail beyond what the schema already states.

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 ('List') and resource ('a repository's commits') with a note on optional filtering, which cleanly separates it from the singular codecov_get_commit sibling. It stops short of explicitly naming that sibling or drawing the list-vs-retrieve distinction, so it is clear but not fully differentiated.

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?

The phrase 'optionally filtered by branch' implies when the branch parameter is useful, but there is no explicit when-to-use versus alternatives (e.g., codecov_list_commit_uploads or codecov_get_commit) and no exclusions or preconditions.

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