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

With no annotations, the description carries the full burden. It usefully discloses that the tool performs no fetch and returns the same score and findings as its counterpart, but says nothing about determinism, side effects, permissions, or the shape of the findings.

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 short sentences with the key differentiator front-loaded. No filler or redundancy; every clause carries information.

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 single-parameter, read-only validation tool with no output schema, the description covers what the tool does, its key constraint (no fetching), and roughly what it returns. Only the structure of the returned findings is left unstated, which is a minor gap.

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 coverage is 100% and there is a single required parameter, so the schema already defines 'content' fully. The description reinforces that the input is text already held locally, but adds no format or constraint detail beyond the schema's own Markdown description.

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 (validate raw llms.txt content) and distinguishes itself from the fetching sibling via 'text you already hold, without fetching it'. It does not name the alternative tool explicitly, but the scope boundary is clear enough to tell the two apart.

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 phrase 'without fetching it' functions as a selection condition: use this when you already possess the text, otherwise the fetching variant applies. It gives clear context but never explicitly names the sibling or states exclusions, 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.