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

With no annotations present, the description carries the full burden, and it does disclose meaningful behavior: the crawl is limited to the homepage in real time, it matches roughly 210 fingerprints, and each call costs 1 credit. It does not cover failure modes (unreachable site, bot blocking), rate limits, or what the response contains, which are significant gaps for an unannotated tool.

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 definition is front-loaded with the purpose and keeps to one dense sentence; the long enumeration of fingerprint categories is informative rather than filler. The parenthetical examples of WordPress themes/plugins, Tailwind artifacts, and Set-Cookie fingerprints add specificity at moderate length cost.

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 one-parameter lookup with no output schema and no annotations, the description conveys what is detected, the scope of the crawl, and the credit cost

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 description coverage is 100%, so the single 'domain' parameter is already documented with an example (example.com). The description adds no extra meaning about accepted domain formats (subdomains, protocols, ports) beyond what the schema states, so the baseline of 3 applies.

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 names a concrete verb (检测/detect) and resource (技术栈/tech stack) and enumerates the fingerprint categories it covers, so the tool's job is unmistakable. It never references any sibling tool, so it does not help the agent discriminate among the other tools in the list.

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?

Usage is only implied: an agent can infer it should call this when it needs the technology profile of a domain. There is no explicit guidance on when to prefer this over alternatives such as site_radar_latest, and no statement of when the tool is inappropriate (e.g. non-HTML targets or SPAs).

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