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

With no annotations provided, the description must carry the full behavioral burden. It hints at copy behavior via 'copied G-code file' but does not state side effects, return values, error cases, or whether the original file is preserved. This is a significant gap for a mutation-style tool.

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, front-loaded sentence with no filler. It is efficient in form, though its brevity contributes to the lack of behavioral and parameter detail.

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 3-parameter tool with no output schema and no annotations, the description is too thin. The agent still needs to infer what gcode/model mean, what the tool returns, and what side effects occur when the preview is injected.

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 0%, and the description adds no explanation of 'gcode', 'model', or 'view'. Bare parameter names are insufficient for an agent to know what values to supply or how they relate to the SVG preview injection.

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 states a specific verb ('Inject') and resource ('SVG preview as comment metadata into a copied G-code file'), making the core action clear. It implicitly distinguishes this from sibling tools like u1_render_preview or u1_slice, though it does not explicitly name alternatives.

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?

There is no guidance on when to use this tool instead of related tools such as u1_render_preview, u1_slice, or u1_analyze_gcode. The agent is left to infer the appropriate context from the name and one-line description.

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