reply_pull_request_review_comment

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

The description discloses two important behaviors: that it verifies the comment belongs to the requested PR before replying, and that the body is sent through stdin and is not audited. With annotations only marking readOnlyHint=false, destructiveHint=false, and idempotentHint=false, the description adds meaningful context about the non-audited stdin body handling and the verification step.

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 sentences, no wasted words. It packs purpose, scoping, and behavioral notes (stdin, no audit) efficiently. Front-loaded with the primary action.

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 mutation tool with no output schema and minimal annotations, the description covers the essential behaviors. The stdin body note and verification step provide transparency. It could arguably mention response format or whether a reply creates a new review thread, but the core operational context is reasonably complete for this tool's complexity.

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 only 17%, with the repository field having a description. The description adds that 'body is sent through stdin', which is a meaningful behavioral note for the body parameter. However, it does not cover the remaining 5 parameters (account, pullRequestNumber, reviewCommentId, hostname), leaving them dependent on their schema definitions, which is a minor gap given most are self-explanatory.

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 verb (reply), the resource (top-level inline review comment), and includes a scoping constraint (after verifying it belongs to the requested pull request). This distinguishes it well from sibling tools like create_pull_request_review_comment and update_pull_request_review_comment, which handle creation and modification.

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 conveys that this is for replying to a top-level inline review comment, implying it differs from creating a new comment or replying within a thread. However, it does not explicitly specify when not to use this tool or name alternative tools for different reply contexts (e.g., threading/review-level replies), leaving some usage ambiguity.

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