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

Annotations already declare this to be a pure, idempotent, non-destructive, closed-world generator. Beyond that, the description adds that it returns the file text plus findings such as duplicate URLs or invalid links, which tells the agent the tool performs validation and reports diagnostics rather than silently succeeding.

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?

Two compact sentences with the construction action front-loaded and the return behavior second. Every clause carries information; nothing is redundant with the title or annotations.

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 takes on the burden of describing return values and does so (file text plus validation findings). Parameters are fully covered by the schema and behavior is covered by annotations, so an agent has everything needed to call it correctly.

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 all five parameters, including nested link objects and the absolute http/https URL requirement, are already documented in the schema. The description only restates the parameter list ('site name, a summary, details and sections of links') without adding formatting or ordering semantics, so baseline 3 applies.

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 and resource ('Builds an llms.txt file in the llmstxt.org format') plus the inputs it consumes. This clearly separates it from robots_txt_generator and other generators by naming the concrete output artifact and format, though it does not explicitly reference any sibling.

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 says what the tool builds but never states when to use it, when not to, or which sibling to pick instead (e.g. robots_txt_generator vs sitemap_check). Usage is only implied by the artifact name.

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