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

With no annotations, the description carries the full burden. It mentions 'Body discarded' as a behavior, but it doesn't disclose that most parameters are ignored, nor does it clarify the tool's read-only nature or any side effects. The schema descriptions hint at discarding, but the description adds minimal value beyond that.

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 a single short sentence, but it is under-specified rather than appropriately concise. It lacks essential usage and behavioral context, making it too terse to be useful. No important information is front-loaded beyond a bare purpose statement.

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 the tool has 9 optional parameters, no output schema, and many similar siblings, the description is severely incomplete. It doesn't explain the output format, how to choose parameters, or when to invoke this tool over alternatives. An agent would struggle to use it 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?

Schema coverage is 100%, so baseline is 3, but the description adds no parameter guidance. It doesn't indicate that the 'url' parameter is the primary input or explain the relevance of the other eight parameters, all marked as discarded. The mismatch between 'library docs' and the generic schema further confuses parameter usage.

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 ('HTTP status') and resource ('public library docs URL'), but it is vague and doesn't match the schema's generic 'url' parameter. It fails to differentiate from siblings like fetch-status or browser-url-ok, which also report HTTP status.

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?

No guidance is provided on when to use this tool versus alternatives. The description gives no conditions, prerequisites, or exclusions, leaving the agent to guess among many similar URL-checking siblings.

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