check_fast_flux

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

Annotations already indicate read-only, idempotent, non-destructive behavior. The description adds significant behavioral detail beyond annotations: it explains that multiple rounds of queries are performed, IP answer sets and TTLs are compared across rounds, and the purpose is to identify rapidly rotating infrastructure. No contradictions.

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 two sentences, front-loaded with the core purpose, and every word adds value. It efficiently communicates the tool's operation without unnecessary detail.

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 complexity (multiple query rounds, comparisons) and the presence of an output schema (which presumably documents return values), the description provides a solid high-level understanding. It explains the detection logic well, but could be slightly more explicit about what the final output indicates (e.g., a boolean or risk score). Still, it is largely complete.

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 coverage is 100%, so baseline is 3. The description adds value by explaining the purpose of 'rounds' (multiple rounds) and 'force_refresh' (bypass cache after DNS changes), and notes that 'format' is auto-detected. This provides additional context beyond the schema descriptions.

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 the tool detects fast-flux DNS behavior by performing multiple rounds of A/AAAA queries and checking IP rotation. It uses a specific verb ('Detect') and resource ('fast-flux DNS behavior'), distinguishing it from sibling check_* tools that target other DNS properties like NS, DNSSEC, etc.

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 explicitly says when to use the tool ('Detect fast-flux DNS behavior') and explains the underlying mechanism, providing clear context. However, it does not mention when not to use it or provide alternatives among sibling tools, which are numerous.

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