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

Annotations already declare readOnlyHint=true/openWorldHint=true, and the description adds real value: the specific detection categories, and notably the pricing/cost model (x402 or prepaid credits, free trial), which is not expressible in annotations. It still omits latency/rate-limit behavior, keeping it below 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?

Front-loaded with the core question, then a dense enumeration of checks, then the verdict/price tail. Nearly every sentence carries information; the price sentence is arguably appended rather than integral, but it is useful for cost-aware agents.

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 values need not be described, and the description still summarizes the shape ('Verdict, score and fixes'). Combined with the check list, an agent has everything needed to call and interpret it correctly; only invocation cost/preconditions beyond price remain unstated.

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 100% and there is only one parameter, so the baseline is already satisfied; the description goes further by clarifying the accepted input form ('what follows uses:') and giving a real example (tj-actions/changed-files@v45) that matches the schema's syntax.

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 check (is this GitHub Action safe) on a specific resource (the 'uses:' reference) and enumerates exactly what is examined: OSV advisories, SHA/tag/branch pinning, deprecated Node runtimes, unpinned Docker, nested actions, publisher/repo health. This clearly separates it from siblings like docker-image, package-check, and repo-health.

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?

Tells the agent precisely how to invoke it ('Pass what follows uses:') with a concrete example, and the framing question implies the use case. It does not explicitly name alternative tools (e.g. docker-image for container pins) or state when not to use it, so it stops short of full routing guidance.

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