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

No annotations are provided, so the description carries full burden for behavioral disclosure. It explains the operation and the OSV source, but says nothing about response format, external service dependencies, rate limits, auth needs, or behavior when no vulnerabilities exist. This is thin for a tool with zero annotation support.

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?

Two sentences with no filler. The main action and data source are front-loaded, and the ecosystem list is compact and directly useful. Every sentence earns its place.

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 simple 3-parameter read tool with full schema coverage, the description covers the core purpose and parameter domain. However, there is no output schema or behavioral notes, so the agent does not learn what the result list contains, and there is no guidance on selecting among sibling tools. This leaves noticeable gaps.

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 description coverage is 100%, so all parameters already documented. The description adds the ecosystem list and optional-version clarification, but these largely mirror the schema, so there is no substantial extra meaning beyond the baseline.

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 verb ('List') and resource ('known vulnerabilities for a software package'), and adds the data source ('via OSV') and the optional version filter. It is clear and functional, but it does not explicitly contrast with the siblings audit_dependencies or cve_lookup, so it earns 4 rather than 5.

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 gives no guidance on when to use this tool versus audit_dependencies or cve_lookup. It does not state exclusions, prerequisites, or when another sibling would be more appropriate. Usage must be inferred entirely from the generic phrase 'List known vulnerabilities'.

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