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

Annotations already declare readOnly, openWorld, and non-destructive, so the safety profile is covered. The description adds real value beyond that by describing how output is structured: a link graph split into internal routes versus outbound citations, with anchor text captured. It omits any note on rate limiting, crawl depth or timeouts for open-world fetching, which is what keeps it off a 5.

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?

A single well-formed sentence with the action front-loaded and zero filler. The output-format detail is packed into the same clause rather than added as a separate redundant statement.

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?

With no output schema, the description carries the burden of explaining the return value, and it does so at a useful level of abstraction (internal vs outbound links, anchor text, standardized file). What remains thin is the 'complete' claim for an open-world operation: nothing about crawl boundaries, page limits, or failure behavior.

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 both 'url' and 'api_key' are already documented in the schema, and the description adds no new detail such as URL formatting constraints, scheme handling, or what the API key unlocks. Baseline 3 is appropriate when the schema does the heavy lifting.

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 concrete verb and resource ('extract a complete link graph ... into a standardized LINKS.md format from any URL') and names the output artifact, which distinguishes it from a generic URL-to-markdown sibling by implication. It never names an alternative explicitly, so it stops short of a 5.

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: 'from any URL' suggests a standalone extraction call, and the LINKS.md format hints at site audit or link-inventory work. There is no explicit when-to-use, no exclusions, and no pointer to when 'url_to_markdown' or the other generate_* siblings would be preferred.

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