colorize_image

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

With no annotations, the description provides key behavioral details: model (DDColor), pricing (5 sats, Bitcoin Lightning), and prerequisite payment. It lacks output format and potential limitations but is otherwise informative.

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?

Four sentences, each adding distinct value: purpose, model, pricing, prerequisite. No wasted words, well-structured, and front-loaded.

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?

Covers purpose, model, pricing, and prerequisite adequately. Missing output format (e.g., base64 image) and potential limits, but acceptable for a tool with payment integration and no output schema.

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 coverage is 100%, so parameters are already documented. The description adds context for paymentId (requires create_payment) but does not significantly enhance understanding of imageBase64 or model_size beyond the schema.

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 explicitly states 'Colorize black-and-white or grayscale photos,' identifying a specific verb and resource. No sibling tool duplicates this functionality, so it clearly distinguishes itself.

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?

It notes that this tool is the only way to colorize (impossible for LLMs) and requires a prerequisite call to create_payment. However, it does not explicitly list exclusion criteria or alternative tools, but the context implies uniqueness.

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