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

Annotations already cover read-only, open-world, non-destructive and non-idempotent behavior, so the description clears a lower bar. It still adds real value beyond them: it discloses quota consumption ('Uses your vendor allowance'), warns that results are a risk signal rather than proof of abuse, and states that no automatic retries occur, which is directly actionable for retry logic.

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?

Four short sentences, front-loaded with the verb, resource and returned data classes. Every sentence carries distinct information: capability, quota, interpretation caveat, retry behavior.

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?

With no output schema and one of two parameters undocumented, the description leaves gaps: it doesn't explain what include_info does, nor what the response shape looks like or what happens on a non-public/invalid address. Adequate but not complete for a lookup tool whose return payload the agent must reason about.

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 0%, so the description must compensate. It clarifies that only PUBLIC addresses are valid for 'ip' (a meaningful constraint not in the schema), but 'include_info' is never named or explained; the word 'optional' only loosely hints that the extra data classes can be toggled.

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?

States a specific verb and resource (look up a public IPv4/IPv6 address) and enumerates the data classes returned: bot signal, datacenter, VPN/proxy, ASN, country. The singular 'an IP address' implicitly separates it from ipdetective_lookup_batch, but the contrast is never made explicit.

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?

'Uses your vendor allowance' and 'No automatic retries' give context about cost and failure handling, but there is no explicit when-to-use or when-to-prefer-lookup_batch guidance. The agent must infer single-IP scope from the wording rather than being told.

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