benchmark

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

Annotations indicate readOnly (no mutation) and openWorld (external dependencies). The description adds context about measuring min/avg/max response times and returning results. However, it does not disclose network behavior, potential timeouts, or data volume implications, but annotations reduce the burden.

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 three short sentences, front-loading the core purpose. It avoids unnecessary detail, but the first and last sentences are somewhat redundant. Still, it is efficiently structured for quick understanding.

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 two required parameters with no schema descriptions and a list of similar sibling tools, the description lacks detail on parameter formats and selection guidance. While it has an output schema, the description does not fully leverage it to explain the return structure. The tool's interface is not fully clarified.

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 0%; parameters have no descriptions. The description mentions 'URLs' and 'iterations' only broadly, without specifying format, constraints, or defaults. This is insufficient to guide correct use given the lack of schema details.

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 clearly states the tool's function: benchmarking URL fetching with timing statistics. It distinguishes from siblings like 'fetch' and 'fetch_batch' by specifying that this tool measures performance rather than just retrieving content. The action and resource are specific.

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. While 'benchmark' implies performance testing, the description does not compare it to 'fetch', 'fetch_batch', or other siblings, nor does it state prerequisites or exclusions.

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