defillama-coin-price

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

No annotations provided, so description carries full burden. Discloses aggregation, ID types, and call limit, but does not mention error behavior, rate limits, or output format. Adequate but not rich.

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?

Extremely concise: two well-front-loaded sentences. First sentence states purpose and usage, second provides a unique selling point. No redundant or irrelevant content.

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 price lookup tool with no output schema, the description covers key aspects: data source, input formats, and call limit. However, it lacks details on return format (e.g., USD prices) and error handling, which would make it fully 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% and already describes the single parameter in detail (ID formats, max 10). Description adds no additional meaning beyond the schema, so baseline 3 applies.

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?

Clearly states it returns on-chain aggregated token prices via DefiLlama coins API, specifying the exact resource (token prices) and action (returns). Distinguishes from siblings like defillama-pack and defillama-protocol by focusing specifically on coin prices.

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?

Provides clear usage context: accepts multiple ID formats and limits calls to 10 tokens. Mentions cost advantage over blockrun.ai, but lacks explicit guidance on when to use this tool versus other defillama siblings or alternative pricing tools.

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