deps_purl_lookup

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

No annotations provided; description states it's a lookup, implying read-only. Lacks details on potential limits, errors, or side effects, but straightforward operation.

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?

Single sentence with format example, highly concise and front-loaded. Every word contributes value.

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?

Given simplicity (1 parameter, no output schema), the description adequately covers purpose and parameter format. No missing context for operation.

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 has 100% coverage with parameter description and examples, but description adds format guidance and example purls, enhancing understanding beyond 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?

Description clearly states 'Look up a package by Package URL (purl) on deps.dev', with specific verb and resource. Distinguishes from siblings like deps_package by specifying the lookup method.

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?

Clearly explains the purl format and provides examples, indicating when to use this tool (when you have a purl). Does not explicitly mention alternatives or exclusions, but context is clear.

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