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

No annotations are provided, so the description must carry the full behavioral burden, but it describes a noun phrase rather than any behavior. It does not disclose whether the tool returns data, performs a comparison, or triggers any side effects, and there is no mention of output structure or limitations.

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 short but poorly structured and ends with an awkward, unclear phrase 'used by UK practices comparison.' It repeats the core idea already present in the tool name and does not front-load a clear action or purpose.

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 and no annotations, the description needs to explain what the tool returns or does, but it fails to do so. While the zero-parameter schema reduces complexity, the agent still lacks enough context to know what result to expect or how this tool fits into the comparison workflow.

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?

The input schema has zero parameters and schema description coverage is 100%, so there are no parameter semantics to explain. The baseline for a zero-parameter tool is 4, and the description does not need to compensate for missing parameter documentation.

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 topic — 'criteria and any filters' of UK veterinary practice management systems — but never states an action or operation. It essentially restates the tool name and title ('compare_criteria', 'What is compared') without clarifying whether the tool lists, explains, or compares these criteria. As a result, an agent cannot tell what invoking it actually accomplishes.

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?

There is no guidance about when to use this tool versus its siblings such as compare_options or compare_table. The description does not mention conditions, exclusions, or alternative tools, leaving the agent to guess which comparison-related tool is appropriate.

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