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

Beyond the readOnly/openWorld/idempotent annotations, the description adds two real behavioral facts: no crawling happens (agent must provide pages) and output grouping is derived from page URLs. These are non-obvious and materially affect how the tool behaves, though nothing is said about determinism or output content (which the output schema covers).

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?

Three short, front-loaded sentences with zero filler. Purpose comes first, then the two behavioral constraints, which is exactly the right ordering.

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 read-only generator with an output schema present, the description covers purpose, the key no-crawl constraint, and grouping behavior. The return shape needn't be explained since an output schema exists; only finer input semantics are left thin.

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 only 33%: 'siteName' and 'summary' are undocumented in the schema, and the description merely restates them ('a site name, a summary, and a list of pages'). It adds no format or content guidance (e.g., what 'summary' should contain, markdown or plain text), so it fails to compensate for the coverage gap.

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 verb ('Render') and specific resources ('llms.txt and llms-full.txt'), and enumerates the three inputs. It's clear what the tool produces; the only gap is that no sibling produces a comparable artifact, so there's nothing to explicitly differentiate from.

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?

'It does not crawl' implicitly tells the agent it must supply pages itself rather than pointing at a URL, which is useful usage context. However, there is no explicit when-to-use/when-not framing and no named alternative, so guidance is only implied.

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