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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It does add useful billing information (0.05 USDC on Base, pay-per-use), but it says nothing about authentication, side effects, output format, or what actually happens when the tool is invoked.

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 short but under-specified rather than concise: it contains only a name echo and a pricing bracket. It front-loads neither a functional summary nor any actionable usage information, so the brevity does not serve the agent.

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?

Despite the simple schema and single parameter, the description is not complete enough for an agent to select or invoke the tool correctly among dozens of OCR-related siblings. It omits the core function, expected input format, and output behavior, leaving only the price and chain as usable context.

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 documents the only parameter, and schema description coverage is 100%. The description adds no parameter-level meaning beyond what the schema provides, but because coverage is complete, the baseline score of 3 is appropriate.

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 does not state a verb or resource; it merely repeats the tool name and adds pricing information. Without the name itself, an agent cannot tell what operation this tool performs or what it produces.

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 guidance about when to use this tool, what type of input it expects, or how it differs from the many sibling OCR tools such as ocr-demo, ocr-batch, and ocr-receipts. The cost note is not a usage condition or exclusion.

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