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

Annotations already declare the mutation profile (readOnlyHint=false, destructiveHint=false, idempotentHint=false), so the bar is lower. The description adds genuinely new context: the required workflows:approve scope and the refusal behavior for human-only gates. It omits retry/idempotency behavior, which matters for a non-idempotent decision tool.

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?

Four short sentences, front-loaded with the action and the key identifier mapping, then the exclusions and the permission requirement. Dense but every clause carries information; the 'review_sha as input_sha' parsing is slightly awkward but purposeful.

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 mutating, non-idempotent tool with no output schema and 0% parameter documentation, the description covers authorization and scope exclusions well but leaves parameter formats and the result of approve vs reject underspecified.

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 0% across 5 parameters, so the description must carry the load. It only maps one parameter (review_sha becomes input_sha) and says nothing about session_id, step_index bounds, notes, or the decision semantics, leaving most of the interface undocumented.

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 concrete action pair (approve/reject) on a specific resource type (internal draft checkpoint), and clearly scopes it against a category it is not (human-only gates). It is distinguishable from generic approval siblings, though it never names the closest alternatives like decide_approval or reject_content_asset.

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?

Explicitly states exclusions: not a human-only approval, not a permission to send, and human-only gates are refused at start. That is real when-not guidance. It stops short of pointing to the sibling tool an agent should use for those refused cases.

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