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

Annotations already declare the tool as read-only, open-world, idempotent, and non-destructive. The description adds valuable behavioral context beyond annotations: it fetches the page, extracts title/description/key links, and emits standard llms.txt markdown as a single text blob. It does not disclose edge-case behaviors like failure handling, but given the strong annotation coverage, this is acceptable.

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 three sentences long and front-loaded with the primary action, then details the process, output format, and use cases. Every sentence contributes value without redundancy, achieving an ideal balance of brevity and informativeness.

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 tool with only two parameters, no output schema, and strong annotations, the description covers the essential aspects: purpose, mechanism, output format, and typical use cases. It lacks explicit caveats about edge cases (e.g., JS-heavy or paywalled sites), but overall it is sufficiently complete for the tool's simplicity.

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% for both parameters (url and max_links), so the schema fully documents parameter semantics. The description adds no extra parameter-level detail beyond what the schema provides, making a baseline score of 3 appropriate.

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 identifies the tool's purpose: generating a production-ready llms.txt file for a given URL. It specifies the verb ('Generate'), the resource ('llms.txt file'), and the target ('any URL'), while distinguishing it from sibling tools by focusing on file generation rather than visibility checks or competitor analysis.

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?

The description provides clear use cases ('getting a client's site indexed by AI, drafting llms.txt for your own project, or auditing how an AI crawler would see a competitor'), which informs when to use the tool. However, it does not explicitly name alternative tools or state when not to use it, so it falls short of a 5.

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