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 that the tool is free ('FREE - no payment required'), which is useful cost-related context, and 'Get' implies a read-only operation. However, it does not mention potential rate limits, data freshness, or whether it uses a public API, leaving some behavioral aspects undisclosed.

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 extremely concise, using just two short sentences. The core purpose is front-loaded, and the 'FREE' note is a valuable addition that doesn't waste words. Every word 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?

This is a simple tool with only two parameters and no output schema. The description conveys the basic purpose and cost, but does not describe the return format (e.g., price, timestamp, currency) or error behavior. Given the lack of an output schema, the agent has no idea what the response will look like, which is a notable gap.

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 description coverage is 100%, so the baseline is 3. The description adds no additional meaning beyond the schema: 'symbol' and 'currency' are already described as crypto and fiat respectively. The phrase 'exchange rates' hints at the relationship between symbol and currency, but this is marginal.

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 tool's function: 'Get cryptocurrency prices and exchange rates from Coinbase.' It uses a specific verb ('Get') and resource ('cryptocurrency prices and exchange rates from Coinbase'), and the name 'coinbase_price' aligns perfectly. While it doesn't explicitly compare to sibling tools, the source specification ('from Coinbase') helps distinguish it from other price-related 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?

No guidance is provided on when to use this tool versus alternatives. With many sibling tools (e.g., 'dexscreener_token', 'nansen_smart_money_holdings'), there is no indication of which tool is best for which scenario. The description lacks any context about use cases or exclusions.

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