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

With no annotations, the description must carry the behavioral burden, and it does partially: listing the contents (names, operators, examples) implies a static, side-effect-free reference. However it does not state that the call is read-only, that arguments are not needed, or what form the guidance comes back in, leaving the agent to assume safety.

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?

A single sentence that front-loads the purpose and enumerates the content covered. It is efficient with no filler, though the phrasing is slightly terse for an agent that needs to know the return shape and sequencing.

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 zero-parameter reference tool with an output schema, the description need not explain return values, and it correctly scopes itself to the rule language used by two named siblings. The remaining gap is sequencing guidance, not capability coverage.

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 tool takes zero parameters, so there is nothing for the description to disambiguate; the schema is empty and fully covered. A baseline of 4 is appropriate here despite no parameter discussion in the text.

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 the resource precisely: rule-writing syntax (available names, operators, examples) for test_setup and scan_today. It clearly distinguishes itself from those siblings by being the reference/'how to write' tool rather than an executor, though it never states that it returns documentation rather than performing an action.

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?

Usage is only implied: an agent can infer it should call this to learn the rule language before invoking test_setup or scan_today, but the description never says 'call this first' or when it is unnecessary. No explicit alternatives or exclusions are given, so routing depends on the agent making the inference itself.

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