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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds useful output context ('with the evidence for each, plus security headers') and input scope ('1-3 websites'), but does not disclose authentication needs, rate limits, or return-format details beyond the listed categories.

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 a single front-loaded sentence that moves from resource to output categories to scope without any filler. Every clause earns its place and the key constraint (1-3 websites) is included compactly.

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 simple one-parameter tool with no output schema, the description adequately states the input scope and the main returned content categories including security headers. It is slightly incomplete on domain-format expectations and exact return structure, but annotations carry the behavioral safety profile and the tool is otherwise well-scoped.

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?

With schema description coverage at 0% and one required parameter, the description must compensate for missing parameter semantics. It only restates the 1-3 website limit already encoded by minItems/maxItems in the schema and does not clarify whether domains should be bare hostnames, URLs, or another format.

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 specific resource (technologies used by websites) and lists the concrete output categories (CMS, e-commerce, frameworks, analytics, tag managers, CDN, chat) plus security headers. It clearly distinguishes tech_stack from siblings like domain_registration, domain_report, and email_security by resource domain, though it does not explicitly name when to choose it over them.

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?

There is no explicit when-to-use or when-not-to-use guidance, and no alternatives are mentioned. The intended use is only implied by the tool name and the phrase 'for 1-3 websites', leaving the agent to infer when this tool is appropriate relative to domain_report or email_security.

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