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

With no annotations provided, the description carries the full burden. It discloses key behavioral traits: data update interval (every 5 minutes), data source (cryptorates.ai), rate limit (30 requests/60s), and the nature of the data (read-only fetch). It does not mention error handling or behavior for invalid symbols, but given the simplicity of the tool, this is adequate. The rate limit and freshness disclosure are valuable.

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 four sentences with no redundancy. The purpose is front-loaded, and each subsequent sentence adds a distinct piece of information: data fields, coin support, freshness/source, rate limit, and a safety tip. The tip is tangential but relevant. Nothing is wasted.

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 the tool's simplicity (one parameter, no output schema), the description covers the return data fields, data freshness, rate limits, and even a best-practice tip. It does not address error scenarios (e.g., unknown symbol) or whether the result is numeric with a specific format, but these are minor omissions. The presence of a tip to call a sibling tool adds operational guidance that enhances completeness.

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 input schema already documents the 'symbol' parameter with a rich list of examples (100% coverage). The description adds the scope 'Supports 5000+ coins' and highlights specific examples, reinforcing the schema but not adding fundamentally new meaning. It does add the breadth of coin support, which is helpful for an agent deciding which symbol to pass. The description does not introduce syntax or formatting details beyond the schema, but the schema is thorough.

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 the verb 'Fetch' and the resource 'current cryptocurrency price data', and enumerates the exact data fields returned (USD price, 24h/7d change, market cap, volume). It distinguishes itself from sibling tools by domain: price data vs. articles and safety checks. No ambiguity about what this tool does.

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 context (trading) via the tip about calling get_token_safety before trading, and it provides operational constraints (rate limit, data update frequency). However, it does not explicitly state when to use this tool versus alternatives, though the siblings are clearly different domains, making confusion unlikely. The lack of explicit 'when not to use' is a minor gap.

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