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

The description adds meaningful behavioral context beyond the readOnlyHint and openWorldHint annotations by disclosing the payment requirement, supported chains, and that invalid pairs are rejected before payment. It does not overclaim or contradict the annotations.

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 compact and front-loaded with the payment caveat, then lists the signal outputs efficiently. It repeats the price already present in the title, but the additional chain detail makes that repetition useful.

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?

With no output schema, the description compensates by enumerating the signal fields returned. Combined with full parameter schema coverage and read-only annotations, an agent has enough information to call the tool correctly, though the response format is not specified.

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%, with pair and interval already well documented including examples, exchange fallback, and default interval. The description's timeframe mention only restates the existing enum range and adds no new parameter-level meaning.

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 that the tool returns the full Ichimoku Cloud signal for a crypto pair and enumerates the output components (direction, cloud position, tenkan/kijun cross, span values). It is distinct in content from ichimoku_trend, but it does not explicitly name or differentiate itself from that sibling.

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 only usage-related information is the prerequisite that the client must be x402-capable and that the tool costs $0.02 USDC. There is no guidance about when to choose ichimoku_signal over ichimoku_trend, confluence_signal, or price_levels, so an agent cannot reliably route between siblings.

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