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

No annotations are provided, so the description carries the full burden of disclosing behavior. It states nothing about side effects, return format, error conditions, or operational characteristics. The tautological text adds no behavioral information whatsoever.

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?

While extremely short, this is under-specification rather than conciseness. Every sentence should earn its place, but this single phrase earns none—it contains no usable information at all.

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 annotations, no output schema, 4 parameters, and no description content, the tool is completely underspecified. An agent cannot determine what input to provide, what output to expect, or when to invoke this tool.

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 four parameters have descriptions. The description adds no parameter meaning beyond the schema, but per the baseline rule, when the schema covers parameters the score is 3 even without description support. The generic 'Input to process' style schema descriptions are weak, but this dimension evaluates the description's added value, which is zero.

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 is 'Fact Check: Fact Check', a pure tautology that restates the tool name without a verb, resource, or any explanation of what the tool does. It provides no differentiation from the thousands of sibling tools, many of which also relate to checking or verifying.

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 offers no guidance on when to use this tool, what problem it solves, or how it differs from alternatives. An agent has no basis for selecting this tool among the massive sibling list.

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