updateMaterials

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

No annotations are provided, so the description carries the full burden. It states it's an update operation, implying mutation, but doesn't disclose behavioral traits like whether it requires specific permissions, if changes are reversible, what happens to unspecified fields (partial vs full updates), error handling for invalid IDs, or rate limits. The batch nature is mentioned, but without details on transactionality or ordering.

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, efficient sentence that front-loads the core action ('Update multiple Materials') and adds value by specifying it's a batch operation ('in a single operation'). There is zero waste or redundancy, making it appropriately sized for its purpose.

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?

Given the complexity (batch update tool with 1 parameter but rich nested schema), no annotations, and no output schema, the description is inadequate. It doesn't explain return values, error conditions, or behavioral context needed for safe invocation. For a mutation tool with significant nested parameters, more completeness is required to guide the agent effectively.

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 detailed descriptions for all nested parameters (e.g., 'alphaCutoff', 'baseColor'). The description adds no parameter-specific information beyond the schema, not even clarifying that 'items' contains the update payloads. However, with high schema coverage, the baseline is 3 as the schema does the heavy lifting.

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 verb ('Update') and resource ('Materials'), and specifies it's a batch operation ('multiple Materials in a single operation'). However, it doesn't explicitly differentiate from sibling tools like 'updateMaterials' vs 'createMaterials' or 'deleteMaterials', which would require mentioning it modifies existing materials rather than creating new ones or deleting them.

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 description provides no guidance on when to use this tool versus alternatives. It doesn't mention prerequisites (e.g., materials must exist), exclusions (e.g., cannot create materials), or compare to siblings like 'updateMaterials' vs 'batchSetProperty' or 'assignMaterials'. The context of batch updating is implied but not explicitly stated as a usage scenario.

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