Chainlink round history for one asset

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

With no annotations, the description carries the full burden and does well: it states newest-first ordering, the exact output fields, the meaning of 'answer' (price × multiplier in USD), and how 'since' and 'limit' affect results. It does not explicitly declare read-only status, but the query semantics and field listing make that clear enough.

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 one dense, front-loaded sentence that conveys resource, ordering, output schema, and filter semantics without filler. Every clause earns its place.

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?

Given no output schema and no annotations, the description covers the essential return values, parameter behavior, and ordering. Minor gaps remain around response envelope, error cases, and exclusivity boundaries, but for a simple history-fetching tool the core information is present.

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 description adds meaning beyond the schema: 'since' is described as narrowing to rounds after an ISO instant, and 'limit' is described with a maximum. It fills the gap for 'limit', which lacks a schema description, while 'symbol' is adequately covered by 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 clearly identifies the resource: Chainlink feed rounds for a ticker, and specifies ordering and returned fields. It lacks an explicit verb like 'retrieves' or 'lists', and it does not directly name a sibling for distinction, though the 'Chainlink feed' qualifier helps separate it from generic history 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 description implies its use case: when you need Chainlink round history for a ticker. However, it gives no explicit when-to-use versus alternative guidance and no exclusions, leaving the agent to infer context from the title and field names.

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