game_canvas

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

With no annotations, the description is relied upon for behavioral traits, but it only states the tool's purpose. It does not disclose side effects, required permissions, reversible actions, or what the return value is.

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, clear sentence with no wasted words. However, it may be too brief for a 6-parameter tool, lacking necessary detail without being overly verbose.

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 tool has 6 parameters, nested objects, and no output schema, the description is inadequate. It fails to explain the relationships between parameters, error scenarios, or expected outcomes, leaving the agent underinformed.

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 has 100% coverage with descriptions for all 6 parameters. The tool description adds no additional meaning beyond the schema, so a baseline score of 3 is warranted.

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 creates or configures CanvasLayer and CanvasModulate, which is specific and actionable. However, it does not differentiate from sibling tools like add_node or game_spawn_node that might also create canvas-related nodes.

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?

No guidance is provided on when to use this tool versus alternatives (e.g., add_node for general node creation). The agent receives no hints about prerequisites or preferred contexts.

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