canvas_new

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

No annotations are present, so the description must convey behavioral traits. It only says 'create/reset' without disclosing whether resetting destroys existing content, whether the operation is idempotent, or any side effects on current canvas state. The potential destructiveness of 'reset' is implied but not explicitly stated.

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, concise phrase ('创建/重置一个空白画布') that states the core function without any unnecessary words. It is front-loaded and every word contributes meaning.

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's simplicity (no parameters, no output schema), the description is minimally sufficient but lacks explicit context about whether it clears existing content and how it relates to the sibling drawing tools. It could benefit from a note that it initializes a fresh canvas for subsequent operations.

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 tool has zero parameters, so the input schema fully covers all parameter needs. The description adds no parameter-level semantics, but with no parameters, the baseline score of 4 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 clearly states the tool's function: to create or reset a blank canvas. This is a specific verb+resource pair that distinguishes it from siblings like draw_line or add_text, which operate on an existing canvas rather than initializing one.

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 about when to use this tool versus alternatives. It does not say to use canvas_new before drawing, nor does it mention when a reset is appropriate. The lack of any usage context makes it unclear how the tool fits into a workflow.

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