AgentCAD

AgentCAD is an independent, agent-oriented parametric CAD platform built on FreeCAD. It provides a controlled MCP gateway, typed CAD operations, structured inspection, transactions, diagnostics, and reproducible verification for engineering agents.

Current display version: 0.0.1-15-07-2026 (pre-alpha; no functional release has been published).

AgentCAD is not maintained, approved, or endorsed by the FreeCAD project.

Purpose

AgentCAD will provide a controlled MCP interface for engineering agents, headless and GUI CAD execution, reproducible regression testing, diagnostic artifacts, and a disciplined route for human-reviewed upstream contributions.

It is a distinct product distribution. Product features and agent-specific changes may evolve independently from FreeCAD, while small compatible fixes can be prepared separately for human adoption and possible upstream submission.

Related MCP server: Fusion Agent Harness MCP Server

Relationship to FreeCAD

This repository contains AgentCAD-owned code only: the Rust MCP gateway, typed worker protocol, Python CAD worker, installable AgentCAD bridge, CAD-IR schemas, tests, documentation, and candidate-fix evidence.

FreeCAD remains authoritative at FreeCAD/FreeCAD. Its source and history are not merged into this repository. The tested upstream revision is recorded in upstream/freecad.json, and the fetch scripts clone that revision into a separate sibling checkout.

The companion Getopir/FreeCAD repository is a history-free, squashed source snapshot used for AgentCAD builds. It is a standalone repository, not a member of GitHub's FreeCAD/FreeCAD fork network. This is intentional: a GitHub fork retains its upstream relationship and history, while AgentCAD keeps its product history and upstream candidate-fix workflow separate.

FreeCAD issues and pull requests remain authoritative upstream. AgentCAD's issue tracker is for AgentCAD features, defects, integration work, and locally tracked candidate evidence.

Repository layout

• agentcad/ — Rust MCP gateway, protocol crates, Python worker, schemas, and tests.

• agentcad-bridge/ — installable FreeCAD integration bridge.

• workbenches/ — governed AgentCAD workbench registry and templates.

• docs/ and wiki/ — normative documentation and reviewed GitHub Wiki source.

• upstream/ — pinned FreeCAD source metadata and synchronization records.

• work-items/ — AgentCAD delivery records and human-adoptable upstream evidence.

Branches

• main is the AgentCAD product branch. It need not be directly upstreamable.

• feature/<topic> is for product features.

• agentcad-fix/<id>-<topic> is for product-only fixes based on main.

• upstream-fix/<issue>-<topic> is created in a separate FreeCAD checkout at the pinned upstream commit. Only the evidence package and patch belong in AgentCAD.

See the architecture, the MCP operation contract, diagnostics, versioning, the workbench agent instruction, the upstream-intake data model, and the upstream candidate policy.

Changes reach protected main through current, tested pull requests with independent approval. See the review and merge workflow.

GitHub is the public source host. The migration design, cutover sequence, and the reason AgentCAD is not itself a FreeCAD fork are documented in docs/GITHUB_MIGRATION.md.

LLM instruction package

The complete lead-agent and contributor instruction package is published at AgentCAD-instructions/README.md. It contains the master implementation contract, persistent repository instructions, MCP interface specification, bootstrap checklist, upstream-fix workflow, and reusable contributor-agent prompt.

The root AGENTS.md and normative files under docs/ remain the active repository copies. The package directory preserves the supplied bundle intact for discovery and reuse.

Status

The Rust MCP gateway and structured Python worker are implemented and tested without unrestricted Python execution. Native FreeCAD build and GUI verification will run on the dedicated development machine when it is available.

Contributing

Read CONTRIBUTING.md before proposing a change, then open a GitHub pull request against main. Candidate upstream patches require a human adopter who understands, tests, reviews, and personally submits the contribution.

License

AgentCAD-owned source is licensed under LGPL-2.1-or-later, matching FreeCAD's compatible LGPL licensing model. See LICENSE and NOTICE.md.