About This Site
Open-source CAD tool for AI agents to design and validate 3D parts. agentcad is an open-source CAD tool designed specifically for AI agents, functioning as a Model Context Protocol (MCP) server and Command Line Interface (CLI). It enables coding agents like Claude Code, Cursor, and Windsurf to write build123d or CadQuery scripts, automatically validate geometry, catch broken code, and render models from multiple angles. This creates a tight feedback loop that helps AI agents fix their own design mistakes and converge on watertight, dimensionally correct, and printable 3D geometry without human intervention, ultimately exporting files in STEP, STL, GLB, and OBJ formats.
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Key Features AI
Core Features
Open-source MCP server and CLI for build123d and CadQuery scripts
Automated geometry validation catching errors in less than 100ms
Multi-angle PNG rendering for agent visual verification
Export support for STEP, STL, GLB, and OBJ formats
Topology reports and version diffs to track design iterations
Pre-injected build123d primitives removing the need for boilerplate imports
Advantages
Open-source and 100% free with no signup required
Runs completely locally for enhanced privacy and speed
Tight, automated agent feedback loop reduces human oversight
No boilerplate code required as imports are pre-injected
Seamless integration with popular AI editors like Claude Code, Cursor, and Windsurf
缺点:Currently limited to Python 3.10–3.12 environments
缺点:Requires knowledge of setting up MCP servers or CLI environments
缺点:Supports only build123d and CadQuery scripting ecosystems
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