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

With no annotations provided, the description carries the transparency burden. It discloses meaningful behavior: 2-credit cost, no charge for empty results or failures, cache=true gives a free cached hit, and the default is always fresh. It does not mention rate limits or auth, but for a read-only lookup these disclosures are strong.

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 compact and front-loaded: three sentences cover purpose, pricing, failure charging, and cache behavior. Every sentence earns its place, though the cache sentence is inaccurate relative to the schema.

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 purpose, main output categories, cost, and cache behavior, which is adequate for basic selection and invocation. However, there is no output schema and no description of result shape or rate limits, and the cache TTL inconsistency leaves a real 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?

All four parameters are already documented in the schema, so the baseline is 3. The description adds no useful meaning for raw or cacheMaxAge, and it introduces a conflicting cache claim: it says cache=true gives a 24h cache hit, while the schema says the 7d response cache with 0 credits on hit. This ambiguity hurts parameter understanding.

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 uses a specific verb and resource: 'Find out where a TikTok creator is likely based and what language they use' and lists concrete outputs: country, language, stable ids, and core profile stats. This clearly distinguishes it from generic TikTok profile or channel 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 use case is implied from the stated purpose, but the description never names sibling tools or says when not to use it, such as when full channel details or audience demographics are needed. The cost and cache advice is operational rather than selection guidance.

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