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pzfreo

build123d-mcp

repair_hints

When build123d code execution fails, this tool analyzes the error message and returns specific fix suggestions for common issues like Location syntax errors, missing .part, and degenerate boolean results.

Instructions

Given an error message from execute(), return targeted fix suggestions for common build123d mistakes: wrong Location syntax, missing .part, CadQuery idioms, blocked imports, degenerate boolean results, fillet edge selection, and more. Pass the full error string from execute() or last_error().

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
error_textYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations provided, the description carries the full burden. It does not disclose whether the tool is read-only, has side effects, or requires specific permissions. For a repair tool, transparency about non-modification is important.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence that front-loads the key information. It is concise but could be slightly shorter by removing the list of examples, though the list adds value.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the single parameter and likely output schema, the description adequately covers input context and the tool's purpose. It lists common mistake types, providing sufficient completeness for an agent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema has 0% description coverage for the single parameter 'error_text'. The description compensates by specifying it should be the full error string from execute() or last_error(), adding meaning beyond the schema's type definition.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: return targeted fix suggestions for common build123d mistakes given an error message. It lists specific mistake types, distinguishing it from sibling tools like last_error or workflow_hints.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description instructs to pass the full error string from execute() or last_error(), making it clear when to use the tool. However, it does not explicitly state when not to use it or mention alternatives.

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

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