Versions of an action

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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is fully covered. The description adds return-content detail but does not disclose rate limits, pagination, or error behavior. With strong annotation coverage, a 3 is appropriate.

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?

A single dense sentence that front-loads the input constraint and enumerates outputs efficiently. No wasted words, though the structure is packed and could benefit from a slight split for readability.

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?

An output schema exists, so return-value explanation is unnecessary. Combined with safety annotations and the description's coverage of input format and output content, the definition is adequate for a read-only retrieval tool. Minor gaps (rate limits, response shape nuances) are acceptable given the annotations.

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 0%, so the description must compensate. It does by specifying the parameter format ('owner/repo, or owner/repo@ref') and the 20-item cap. This provides meaning the bare schema array lacks, though it could go further on delimiters or edge cases.

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 uses a specific resource ('actions') and enumerates the exact deliverables: latest release with commit SHA and runtime, newest release per major version, and ref resolution with pin line. The resource and return scope are unambiguous and clearly distinct from siblings check_workflows and runner_labels, which concern workflows and runner metadata respectively.

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 implies its purpose (retrieving action version information) and is clearly distinct from the siblings by subject matter, but it does not explicitly state when to choose this over alternatives or provide exclusion conditions. The usage context is inferred rather than stated.

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