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

With no annotations provided, the description carries the full burden of behavioral disclosure. It reveals that the tool is paid ($0.01 USDC via x402) and provides real-time data, which are useful behavioral traits. However, it does not mention potential rate limits, failure modes, or whether the quote is delayed, which could be relevant for an AI agent.

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 sentence that efficiently conveys the core purpose and the key differentiator (cost). It is front-loaded with the primary task, and there is zero waste or redundancy.

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 parameter fully described by the schema and no output schema, the description covers the essential purpose and cost. However, it lacks context on expected output format (e.g., price, 24h change) and any usage constraints like symbol availability, which could be needed for an agent to invoke it correctly in diverse scenarios.

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 already fully covers the single parameter 'symbols' with a description ('Comma-separated: btc,eth,sol'). The description does not add further meaning beyond label and format, but since schema coverage is 100%, the baseline of 3 is appropriate. The description's mention of 'specified symbols' aligns with the parameter but does not enrich it.

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 provides real-time market quotes for specified symbols, using a specific verb ('get') and resource ('market quote'), and differentiates from siblings by noting the cost and real-time nature. The mention of 'specified symbols' and the comma-separated format implies a simple quote retrieval, distinguishing it from deeper analysis or reports.

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 usage for obtaining real-time quotes for a list of symbols, but does not explicitly state when to use this tool versus alternatives like 'get_crypto_prices' or 'get_market_analysis'. No exclusions or alternative recommendations are provided; the cost and real-time aspect hint at differentiators, but explicit guidance is missing.

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