web_fetch

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

With no annotations provided, the description bears full responsibility for behavioral disclosure. It fails to mention any traits such as error handling for invalid URLs, rate limits, authentication requirements, or whether JavaScript is executed. The minimal text offers no behavioral context beyond the basic action.

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?

At seven words, the description is extremely concise, but it sacrifices clarity and detail. While brevity is generally positive, here it leads to under-specification. The single sentence lacks structure and fails to earn its place by conveying all necessary information.

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's simplicity (2 parameters, no output schema, no annotations), the description should at minimum explain return value format and error conditions. It does neither. The agent receives insufficient context to safely use the tool without additional knowledge.

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?

The schema has 0% description coverage, and the tool description adds no meaning to the parameters. 'url' and 'format' are left entirely unexplained; the agent cannot infer that 'url' must be a valid HTTP URL or that 'format' controls output type. This is a critical gap for a simple two-parameter tool.

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 verb 'Fetch and extract' and the resource 'content from a URL', making the tool's purpose immediately understandable. It distinguishes itself from sibling tools, which are primarily search or database operations, by focusing on arbitrary URL retrieval.

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 provides no guidance on when to use this tool versus alternatives, no exclusions, and no context about prerequisites. Sibling tools like 'perplexity_search' or 'github_get_repo' may also fetch content, but no differentiation is offered.

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