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

No annotations are provided, so the description carries the full burden. It discloses source, network, and cost ('FREE'), but does not mention behavioral aspects like rate limits, caching, or behavior for unsupported symbols. Not misleading but minimal.

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?

Two sentences, front-loaded with the core purpose. 'No payment needed' is redundant with 'FREE', but overall concise and easy to scan.

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 single-parameter tool with no output schema, the description provides key context: source, network, and supported assets. It omits return format, but the purpose is obvious. Adequate for the tool's simplicity.

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 0%, but the description lists example values for the 'symbol' parameter (ETH, BTC, SOL, DOGE, AVAX, LINK, USDC, EUR vs USD), adding meaning beyond the bare schema. However, exact format (case, pair notation) is not specified.

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 states a specific verb and resource: 'live crypto/FX price' from Chainlink oracles on Base. It lists supported assets, distinguishing it from siblings like company_lookup or email_verify.

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 context (live data, Base network, supported symbols) implying when to use. No explicit exclusions or alternatives, but siblings are unrelated, so the context suffices.

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