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

Annotations already declare read-only, idempotent, open-world, and non-destructive behavior. The description adds valuable non-annotated context: pricing at $0.005 USDC per successful call, x402/Solana payment, and the equivalent HTTPS endpoint.

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 audit scope and uses compact, information-dense sentences. Pricing and the HTTPS endpoint are included without unnecessary prose.

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 one-parameter, read-only audit tool with no output schema, the description gives enough detail about what is audited and that fix recommendations are included. It could be slightly more complete on response expectations or failure behavior, but the core calling context is present.

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%, so the single 'url' parameter is already documented as a public http(s) URL or bare hostname. The description only says 'of a URL' and adds no further parameter semantics, which is the baseline for high schema coverage.

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: 'Graded HTTP security-header audit of a URL.' It enumerates the exact header families checked, which distinguishes it from broad siblings like http_probe or redirect_chain.

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?

Usage is implied by the security-header focus, but the description does not explicitly say when to choose this tool over alternatives such as http_probe, redirect_chain, hsts_preload, or ssl_cert_info. No exclusions or prerequisites are stated beyond the URL requirement.

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