Reply to review

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

Annotations cover the safety profile (readOnlyHint=false, idempotentHint=true, destructiveHint=false), and the description adds genuinely new behavioral context: the reply is publicly visible, it replaces any earlier reply, and it is capped at 350 characters. It does not disclose rate limits, auth/permission requirements, or how failures surface, so it stops short of a 5.

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?

Three short clauses, zero filler, and the most important constraint (public, replacing an earlier reply) is front-loaded before the character limit and the dry_run hint.

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 4 parameters, the description covers the essentials an agent needs: public visibility, replacement semantics, the length limit, and a preview path. Remaining gaps (auth requirements, error behavior, package_name fallback) are minor and partly covered by the schema.

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 75% and both the 350-character cap and dry_run behavior are already documented in the schema descriptions, so the description largely repeats structured data. It adds no meaning for review_id or package_name; baseline 3 is appropriate.

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 ('Posts a PUBLIC developer reply to a review') with the scope qualifier PUBLIC, which distinguishes it from the read-only siblings list_reviews and get_review. An agent can identify the operation and its write nature without opening the schema.

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 gives one actionable usage hint ('Use dry_run to preview without posting') but offers no when-to-use/when-not guidance relative to alternatives, nor any precondition such as needing an existing review. Usage is implied rather than explained.

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