# Reported issues for FreeCAD MCP

Pod holds 6 of 6 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded entirely — a maintainer's release checklist is not a warning to a prospective user.

Back to [FreeCAD MCP](/mcp/freecad-mcp).

## Most discussed

### Upstream Dependency Updates Available

# Upstream Dependency Updates Available

## FreeCAD
### Stable (1.1.x) — installable via conda-forge
- Current: v1.1.0
- Latest on conda-forge: v1.1.3
- **Action:** bump `ARG FREECAD_VERSION=1.1.3` in `Dockerfile`

**Note:** Review and test before upgrading. FreeCAD API may change between versions.

[Read the thread](https://github.com/blwfish/freecad-mcp/issues/59) · 2026-08-10 · closed · outside contributor · 1 comment

### macOS: FreeCADCmd and headless_server.py auto-detection misses the documented install locations

Heads-up rather than a bug report — both of these have working escape hatches (`FREECAD_MCP_FREECAD_BIN`, `FREECAD_MCP_MODULE_DIR`), so nothing is broken. But on a fresh macOS install that follows `AGENT-INSTALL.md` exactly, neither auto-detection path finds what it's looking for, and the env vars are documented as "auto-detected" — so an agent doing the install has no particular reason to set them until something fails later.

Both come down to the same thing: the auto-detection candidates don'

[Read the thread](https://github.com/blwfish/freecad-mcp/issues/58) · 2026-08-10 · closed · external user · 0 comments

### macOS: view_control screenshot always exceeds 50KB frame limit (full-screen capture, width/height ignored)

## Summary

On macOS, `view_control(operation="screenshot")` can never succeed on a large display. The macOS branch of `take_screenshot` captures the **entire screen at native resolution** and returns it as inline base64, which exceeds the 50 KB `MAX_MESSAGE_SIZE` frame limit by an order of magnitude. The frame is refused and the result is discarded.

On this machine the payload is **769.6 KB against a 50 KB limit — 15.4× over**. No combination of arguments avoids it, because the requested `widt

[Read the thread](https://github.com/blwfish/freecad-mcp/issues/57) · 2026-08-10 · closed · external user · 0 comments

### Upstream Dependency Updates Available

# Upstream Dependency Updates Available

## FreeCAD dev-weekly CI pin
- Current (integration-tests.yml `dev-weekly` slot): weekly-2026.07.15
- Latest weekly on GitHub: weekly-2026.07.22
- **Action:** bump the `tag:` under the `dev-weekly` slot in `.github/workflows/integration-tests.yml` to weekly-2026.07.22 -- test locally first (a real FreeCAD API/behavior change between weeklies has broken CI-relevant handler code before, e.g. the create_tool ToolBit.from_dict() parameter-format regression fi

[Read the thread](https://github.com/blwfish/freecad-mcp/issues/47) · 2026-07-27 · closed · outside contributor · 1 comment

### Upstream Dependency Updates Available

# Upstream Dependency Updates Available

## FreeCAD
### Stable (1.1.x)
- Current: v1.0.0
- Latest: v1.1.1
- **Action:** bump `ARG FREECAD_VERSION=1.1.1` in `Dockerfile`

## Python Dependencies
```
pip==26.1.2
pydantic_core==2.47.0
```

**Note:** Review and test before upgrading. FreeCAD API may change between versions.

[Read the thread](https://github.com/blwfish/freecad-mcp/issues/29) · 2026-06-15 · closed · outside contributor · 1 comment

### macOS crash: NSWindow init from non-main thread when creating document via MCP

## Description

FreeCAD crashes with `SIGABRT` on macOS when the MCP server triggers document creation (e.g., via `part_operations` → `box`). The crash occurs because `NSWindow` initialization happens on a background thread (Thread 6), which violates macOS AppKit's strict requirement that all GUI operations occur on the main thread (Thread 0).

## Environment

- **macOS**: 26.0 (25A5316i)
- **Hardware**: MacBookPro18,2 (Apple Silicon, ARM64)
- **FreeCAD**: Installed via `/Applications/FreeCAD.ap

[Read the thread](https://github.com/blwfish/freecad-mcp/issues/16) · 2026-05-19 · closed · external user · 3 comments

## Most recent

The remaining reports are on [the project's issue tracker](https://github.com/blwfish/freecad-mcp/issues).