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

Annotations already declare readOnlyHint and openWorldHint, covering safety. The description adds that it returns categorized technology detections with version and confidence info, which is useful but does not disclose potential errors, rate limits, or authentication requirements. The information adds moderate value beyond the annotations.

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 concise and front-loaded with the main purpose. It uses three short sentences plus an Args block, with no wasted words. Every sentence adds value.

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 simple tool (one required parameter, no output schema, annotations present), the description covers the essential aspects: what it does, what it returns, and how to use the parameter. It lacks details on error handling or output format, but the mention of 'version + confidence info' provides a reasonable mental model for the response.

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 one parameter (domain) with no description (0% coverage). The description adds an Args section with explanation and examples, providing minimal but essential semantics. It could be improved by specifying acceptable formats, handling of invalid domains, or timeout behavior.

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 that the tool detects the technology stack of a website, listing specific categories like frameworks, CMS, analytics, etc. It also mentions it wraps a specific API, making the purpose concrete. However, it does not explicitly differentiate from a similarly named sibling under seo-web-analysis, which could cause confusion.

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. Despite the existence of a nearly identical tool under seo-web-analysis, the description does not mention context or exclusions. The phrase 'drop-in replacement for the discontinued Wappalyzer API' gives some context but does not help an agent choose between this and the SEO variant.

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