get_canvas_summary

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

Indicates read-only behavior (get request) without listing any destructive actions. Since no annotations are provided, the description adequately conveys it is a safe query tool. Does not mention permissions, but for a simple read this is acceptable.

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?

Two concise sentences with no wasted words. The purpose and usage advice are front-loaded, making it easy to parse.

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?

The description is complete for a simple read-only tool with one optional parameter and no output schema. It explains what the summary contains and how to use it (first). A minor addition about the optional frameIndex parameter could improve completeness, but it is not necessary.

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 covers 100% of parameters with descriptions. The description adds no additional meaning beyond the schema, only clarifying the output. Baseline score of 3 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?

Clearly states 'Get a compact summary of the canvas' and specifies the included fields: dimensions, fill count, bounding box. Distinguishes itself from sibling tools like get_canvas_ascii and get_canvas_preview by being a compact summary.

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?

Explicitly recommends using this tool first to understand the canvas before requesting more detail. This provides clear usage context, though it does not name specific alternative tools.

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