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

No annotations are present, so the description carries full burden. It discloses only that the body is discarded, but does not explain that most parameters are 'discarded after shape check' or that the tool may perform non-HTTP checks. Overall behavior is opaque and potentially inconsistent with the claim of fetching a URL.

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 concise sentence, which is efficient, but it omits critical information about the tool's actual scope and parameters. Brevity is achieved at the cost of accuracy and completeness.

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 tool with 9 optional parameters, no output schema, and no annotations, a one-sentence description is grossly insufficient. It does not explain how each parameter is used, what the output format is, or what conditions apply, making it impossible for an agent to invoke it correctly in most scenarios.

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 descriptions cover all 9 parameters (100% coverage), so the schema itself documents parameter meaning. However, the tool description adds no parameter-level detail, and the schema descriptions imply shape-check behavior that contradicts the stated HTTP-status purpose, leaving the agent uncertain about how each parameter affects the call.

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 action (returning HTTP status and content type for a URL), but the schema exposes 9 unrelated parameters (git ref, city, feed, json, path, zone, query) that imply a multi-purpose shape-check tool, creating ambiguity. It also fails to differentiate from sibling tools like fetch-status or normalize-url.

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 does not mention exclusions, prerequisites, or conditions that would select web-fetch over its many siblings.

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