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

Annotations already establish readOnly/destructive/idempotent status, but the description adds real behavioral context: an output cap of 200 links, no key/credits/wallet required, and that source/input limits apply. It stops short of describing pagination or what happens to non-HTTP(S) or relative links.

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 core action is correctly front-loaded, but 'FREE during validation. No key, credits, wallet or preparation needed.' is marketing fluff and 'Supply your task in input' is filler that muddies rather than clarifies. Several sentences don't earn their place.

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?

An output schema exists, so return values need no explanation, and the description covers the main constraints (200-link cap, no credentials, baseUrl resolution). The vague 'Existing source and input limits apply' leaves an agent unsure of the actual bounds, but otherwise nothing critical is missing for this simple extraction tool.

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?

Only one top-level parameter (input) with a nested object, and schema description coverage is 0%, so the schema documents nothing. The description partially compensates by implying the page URL (baseUrl) and HTML body roles, but never names or explains them, and 'Supply your task in input' is vague about what input must contain.

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?

States a specific verb (Extract) and resource (links), quantifies the output cap (up to 200), and explains resolution behavior against the page URL. This cleanly separates it from siblings like html_images, html_forms, and html_feeds without opening any schema.

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 when-to-use/when-not guidance and no mention of alternatives such as web_link_shortlist or html_feeds, which also produce link-like output. The only routing-like sentence is the confusing 'Supply your task in input', which gives no selection criteria.

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