whatweb_fingerprint

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

With no annotations, the description carries the full burden of disclosing behavioral traits. It does not mention that this is an active network scanner that sends HTTP requests, nor does it explain potential side effects, rate limiting, or the meaning of aggression levels. It also does not clarify whether the tool is read-only or could have any impact, leaving the agent to infer the operational behavior from the tool name and 'whatweb' reference.

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 well-organized with labeled sections (USECASE, INSTRUCTIONS, INPUT_DESCRIPTION, OUTPUT_DESCRIPTION, EXAMPLES, PREREQUISITES, RELATED_TOOLS) and front-loads the core purpose. It is a bit verbose and repeats some information (e.g., in-scope requirement mentioned multiple times), but the structure makes it scannable and each section earns its place. It could be trimmed, but it is not bloated.

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 moderate complexity, the description is quite complete: it includes use cases, step-by-step instructions, prerequisites, an example, related tools, and expected output structure. However, the lack of clarity on the aggression range and the absence of behavioral transparency (e.g., network activity) leave gaps. The presence of an output schema reduces the need to detail return values, but the description still provides some. Overall, it is above average but not perfect.

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 descriptions are entirely absent (0% coverage), so the description must compensate. It does explain 'target' as 'URL to fingerprint (must be in scope)' and 'aggression' as 'whatweb aggression level (1-4)' or '1=stealthy .. 3=aggressive' in different sections. However, these two ranges (1-4 vs 1-3) contradict each other, which degrades clarity and could mislead an agent about valid inputs. The inconsistency prevents the description from fully compensating for the schema gap.

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 opens with a specific verb+resource: 'Fingerprint web technologies used by an in-scope site (whatweb).' It clearly identifies the tool's function as identifying CMS, frameworks, servers, and libraries, distinguishing it from sibling tools like nikto_scan and nuclei_scan which focus on vulnerability scanning.

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 clear usage context: ensure host is in scope, provide URL and optional aggression level, and call. PREREQUISITES explicitly states 'Host authorized and in scope.' RELATED_TOOLS lists related utilities, but there is no explicit when-not-to-use guidance or criteria for choosing this tool over alternatives, so it lacks full exclusionary guidance.

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