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

The description clearly frames the operation as a read-only price lookup and identifies CoinGecko as the data source, so an agent can infer it is safe and non-mutating. It does not disclose limitations such as invalid-ID behavior, rate limits, or response format, and no annotations are available to cover those gaps.

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 a single front-loaded clause that leads with the result ('current USD prices') and then adds the only necessary input-format detail. Every part earns its place, and there is no repetition or filler.

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?

For a simple tool with one optional parameter, a default value, no nested objects, and no output schema, the description plus schema provides enough to invoke the tool correctly. The main omission is explicit output-shape detail, but 'current USD prices' adequately signals the expected return for this straightforward lookup.

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?

The schema fully describes the single parameter, including type, default, and comma-separated CoinGecko ID format, so the baseline is 3. The description only reinforces that one or more IDs are accepted without adding meaningful new semantics beyond the schema.

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 names the resource (coins) and the value delivered (current USD prices), and the CoinGecko-id note makes the input domain concrete. It lacks an explicit verb such as 'get' or 'return' and does not explicitly contrast with sibling tools, but the intent is unambiguous.

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 use for current USD cryptocurrency price lookups and makes the input format clear. It provides no explicit when-to-use/when-not-to-use guidance or alternatives, though the sibling tools are distinct enough that mis-selection is unlikely.

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