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

Beyond the read-only annotations, the description discloses the approximate number of pages read, the exact signal categories, how gaps and unmeasured signals are represented, and that results are indications rather than compliance conclusions. It also discloses rate limiting and host restrictions, which are important operational traits not present in the annotations.

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?

The description is front-loaded with the core behavior and then adds necessary caveats about signal interpretation, scope, and rate limits. It is somewhat dense and long, but nearly every clause carries material information for correct use.

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?

With no output schema, the description adequately explains what the tool returns: which of eight signals are visible, what makes missing signals visible, and how incomplete readings are marked. Combined with the annotations and simple schema, this is complete enough for an agent to invoke the tool correctly.

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?

There is only one parameter and the schema already documents it at 100% coverage, including the owner/name or full URL format. The description adds only that the repository must be public, which is useful but does not add syntax or format detail beyond the schema.

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 verb and resource: it reads public GitHub repository pages and reports eight named CRA-related security signals. It clearly distinguishes its scope from a compliance check, certificate, or legal advice, so an agent can identify exactly what the tool does.

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?

It states clear boundaries: only public GitHub repositories can be checked, private repositories and non-GitHub hosts cannot, and usage is rate limited. It does not compare alternatives, but there are no sibling tools to contrast, so the guidance is strong though not exhaustive.

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