colorize_from_scratch

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

The description only restates the operation ('create + assign') without disclosing behavioral details beyond the annotations. While destructiveHint=true already signals mutation, the description does not explain what happens to existing materials, whether it overwrites slots, or any other side effects. It adds no new behavioral context.

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 a single short sentence, which is structurally simple and front-loaded. However, it is so under-specified that it fails to convey essential details for a destructive tool with four parameters. This is under-specification, not effective conciseness, as the brevity comes at the cost of critical information.

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?

For a mutating tool with destructiveHint=true and four parameters, the description is extremely incomplete. It lacks usage context, parameter semantics, and any behavioral caveats. The existence of an output schema does not offset the complete absence of guidance for selecting and invoking this tool, making it nearly insufficient for an AI agent.

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 description provides no information about the parameters (color, metallic, roughness, object_name). With schema description coverage at 0%, the description should compensate by explaining how these parameters relate to the PBR material, but it is entirely silent. The only hint is 'PBR material,' which is not tied to any specific parameter, leaving the agent to guess the semantics.

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: 'buat + tetapkan material PBR ke objek' (create + assign PBR material to object). It distinguishes itself from siblings like create_material and assign_material by combining both operations in a single call. The verb+resource is specific and unambiguous.

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 phrase 'Sekali jalan' (in one go) implies a combined create-and-assign workflow, but there is no explicit when-to-use or when-not-to-use guidance. It does not mention alternatives like create_material or assign_material, though the implication of a one-step convenience is present. This is implied usage, not explicit guidance.

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