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

With annotations covering the read-only/open-world safety profile, the description adds genuinely new operational context: the 300-candle window and, importantly, a per-call cost of $0.003 USDC via x402, which is a real constraint the annotations do not express. It omits rate limits or auth mechanics beyond the payment hint.

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?

Front-loaded with the core purpose, then the indicator list, then the cost. Every clause carries information and the pricing note is correctly placed last. The enumeration is long but each item is a distinct return field, so it earns its space.

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?

Because there is no output schema, the description usefully enumerates the returned indicators, covering the response side well. However, for a tool with two undocumented inputs and a payment requirement, the missing pair/interval semantics and payment-flow detail leave the definition only minimally complete.

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 0% and the two parameters (pair, interval) are completely undocumented. The description mentions the 300-candle window but never defines the pair or interval formats (e.g., 'BTCUSDT', '1h'), so it fails to compensate for the schema gap where compensation is required.

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?

States a specific verb+resource ('technical indicators computed on 300 candles') and then enumerates the exact outputs (RSI 14, MACD, SMA/EMA, Bollinger, ATR, bias). An agent can immediately tell this apart from raw-data siblings like crypto_candles or crypto_price. It stops short of naming a sibling, so it falls just under a 5.

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?

There is no when-to-use guidance and no mention of alternatives (crypto_candles, crypto_price, report_trading_signal) despite many adjacent siblings. The description only says what it returns, leaving selection to the agent. Implied usage at best, not explicit routing.

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