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

No annotations are provided, so the description carries the entire behavioral burden and delivers almost nothing: no indication of what is returned, whether the library is static or remote, whether pagination applies, or whether fetching incurs cost. 'Library' at least signals a collection of templates rather than a mutation, which is why this is not the lowest score.

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 single sentence is short but largely redundant, echoing the tool name before adding only three words of payload. Brevity here reflects under-specification rather than disciplined conciseness.

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 three-parameter tool with no annotations, no output schema, and 0% schema description coverage, the definition leaves every substantive question unanswered: what the parameters mean, what a call returns, and when it should be chosen.

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?

All three parameters (n, limit, category) have zero schema description coverage, and the description mentions none of them. The names are genuinely ambiguous — 'n' as a string and 'limit' as a string give an agent no basis for what values are valid, so the description 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 restates the name ('x402-prompt-templates: AI prompt template library'), giving a resource but no verb: it is unclear whether the tool lists templates, fetches one by id, or searches them. Nothing distinguishes it from adjacent AI-prompt siblings such as x402-ai-prompt-optimize or x402-ai-outline, so an agent cannot route confidently.

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 when-to-use statement, no condition that selects this tool over any sibling, and no mention of prerequisites. The category/limit parameters imply browsing or search, but the description never says so.

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