get_latest_sha

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

The annotations indicate readOnlyHint=true and destructiveHint=false, which the description reinforces by stating 'fetches'. However, no additional behavioral traits are disclosed beyond the fact it is a read operation. With annotations present, the description adds minimal extra transparency.

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?

The description is extremely concise (one short sentence), but it sacrifices necessary detail. While brevity is positive, the description is under-specified for a tool with two required parameters and no schema descriptions.

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?

Given the tool has two simple parameters and an output schema exists, the description is incomplete. It does not clarify what 'latest commit' refers to (e.g., default branch, the most recent across all branches) or any other context needed to make the tool safe and predictable.

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?

The input schema has two parameters (repo_owner, repo_name) with zero description coverage. The tool description does not mention these parameters or explain their roles, leaving the agent without guidance on what values to provide or how they affect the result.

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 clearly states the tool fetches the SHA of the latest commit, which is specific and distinct from sibling tools like get_pr_diff or get_repo_stars_since. However, it does not explicitly differentiate from all siblings, but the name and description together make the purpose unambiguous.

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 description provides no guidance on when to use this tool versus alternatives, nor does it mention any prerequisites or context. There is no mention of branch specificity or default behavior, leaving the agent without decision support.

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