bl_check_dnsbl

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

No annotations are provided, so the description carries the full burden. It discloses that the IP is reversed and queries run in parallel, and that results are per-list with status and reason. However, it does not mention potential rate limits, timeouts, or handling of individual list failures, which are typical concerns for an external network tool.

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 three sentences with no fluff: it states the core action, the method (parallel queries), and the return value. Every sentence earns its place, and the most important information is front-loaded.

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?

The description covers the key return information (per-list status and reason) and the operational approach (parallel queries), which is sufficient for an agent to understand the tool's behavior. It lacks exact result structure and error handling, but given the moderate complexity and no output schema, this is a minor gap.

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 description coverage is 100%, so both parameters are fully documented. The description adds little beyond what the schema provides, aside from implementation details like reversing the IP and parallel queries. Baseline of 3 is appropriate given the high schema coverage.

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 checks an IP address against multiple DNS-based blocklists, with a specific verb and resource. It distinguishes from siblings like bl_check_surbl by emphasizing IP-based DNSBL/RBL checks, and mentions parallel queries and per-list results.

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 implies usage: it is for checking IP reputation against multiple blocklists, and the focus on 'IP address' helps differentiate from domain-focused alternatives like bl_check_surbl. However, it does not explicitly state when to use this versus other blocklist tools or provide exclusions, leaving room for ambiguity.

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