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

Annotations already cover safety (readOnly, idempotent, non-destructive, open world). The description adds valuable behavioral context beyond annotations: the 256 KB body limit, $0.02 USDC per successful call via x402 on Solana, and the HTTPS endpoint, plus what the response contains.

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 dense but front-loaded with the core purpose and contains no filler. The long lockfile list and pricing/endpoint details are useful, though the single-paragraph, semicolon-chained structure is somewhat heavy.

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?

There is no output schema, so the description carries the burden of explaining returns: severity summary, per-package advisories with CVE aliases, CVSS, fixed versions, and a safe upgrade heuristic. It also covers cost, input limits, lockfile support, and the alternative HTTPS endpoint, making it complete for correct invocation.

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 baseline is 3. The description adds meaningful semantics beyond the schema by noting that lockfile type is auto-detected and by tying the 256 KB limit to the lockfile/body input, though it largely restates the 500-package maximum.

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 states a specific verb and resource: dependency vulnerability scan (SCA) via OSV.dev querybatch. It clearly distinguishes the batch capability by noting up to 500 packages or a pasted lockfile, separating it from a single-package sibling like osv_scan.

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 gives clear context for use: batch package scanning or lockfile-based scanning with auto-detection for many ecosystem lockfiles. It does not explicitly name osv_scan as the single-package alternative or state exclusions, so it falls short of full when/when-not guidance.

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