defense_effectiveness

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

The description adds value beyond the readOnlyHint annotation by explaining the scoring basis ('blocks vs false positives') and the tier requirement. It does not mention any destructive behavior, which is consistent with the read-only hint.

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 four sentences with no extraneous words. It is front-loaded with the purpose, then details the return value, requirements, and argument. Very efficient.

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?

Given the tool's simplicity (1 param, read-only, output schema exists), the description covers input, output format, and requirements. A minor gap is lack of error handling, but overall it is adequate.

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?

Since schema description coverage is 0%, the description compensates by explaining 'defense_id: The defense rule ID to evaluate.' This provides necessary meaning beyond the schema's empty 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?

The description clearly states 'Measure the effectiveness of a deployed defense' with a specific verb and resource. It distinguishes from siblings by mentioning the 0-1 score based on blocks vs false positives, which is unique among defense tools.

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 mentions a prerequisite ('Requires Pro tier or Novyx Cloud') but does not provide explicit guidance on when to use this tool versus alternatives like defense_stats. The context is implied but not fully elaborated.

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