Umutcan EdizsalanandCursor
af4813e7b6
source_review.json extended with three projects reviewed 2026-07-23 (LokmenoWer/best-cad-mcp B/74, daobataotie/CAD-MCP B/35, zh19980811/Easy-MCP-AutoCad C/30) and our entry updated to the released v1.4.0 (95: CI matrix, PyPI packaging, A/B gate, paper space, ISO 286, opt-in solids). Chart regenerated via render_chart; README benchmark section now opens with the leaderboard + 9-row table, source-review lane merged into it. Co-authored-by: Cursor <cursoragent@cursor.com>
358 lines
15 KiB
Markdown
358 lines
15 KiB
Markdown
# AutoCAD MCP Pro
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Production-grade AutoCAD automation for AI agents — live through COM on
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Windows, or headless through ezdxf on any platform.
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[](https://github.com/U-C4N/Autocad-MCP/actions/workflows/ci.yml)
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[](https://pypi.org/project/autocad-mcp-pro/)
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[](LICENSE)
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[](pyproject.toml)
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[](https://github.com/jlowin/fastmcp)
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[](https://github.com/U-C4N/Autocad-MCP/stargazers)
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One typed MCP contract controls two execution engines. Build and edit drawings,
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query exact geometry, apply engineering standards (ISO 128/129/286/1101),
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refine quality issues inside transactions, and deliver hashed artifacts with
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validation evidence.
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> **v1.4 release snapshot:** 131 tools · 6 resources · 5 prompt templates ·
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> 474 collected tests. Runtime discovery through `system_about` is authoritative.
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## Install in 10 seconds
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```bash
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pip install autocad-mcp-pro # or: uvx autocad-mcp-pro
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autocad-mcp # stdio MCP server, backend auto-selected
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```
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Headless (no AutoCAD required, any OS) or live AutoCAD on Windows:
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```bash
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AUTOCAD_MCP_BACKEND=ezdxf autocad-mcp # portable DXF engine
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AUTOCAD_MCP_BACKEND=com autocad-mcp # live AutoCAD (pip install "autocad-mcp-pro[com]")
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```
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Extras: `[com]` live AutoCAD (pywin32 + Pillow), `[pdf]` PDF/screenshot
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rendering (matplotlib), `[full]` everything. Working from a checkout is the
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same commands with `pip install -e ".[full]"` and `python server.py`.
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## Benchmarks
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Every number below is generated by a script in [`benchmarks/`](benchmarks/)
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and rendered to SVG with Python (matplotlib). No hand-edited charts, no
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adjectives.
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### The leaderboard — nine public AutoCAD MCP servers, one rubric
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| # | Project | Score | Evidence |
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|--:|---|---:|:---:|
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| 1 | **[U-C4N/Autocad-MCP](https://github.com/U-C4N/Autocad-MCP)** (this repo, v1.4.0) | **95** | A |
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| 2 | [varavista/autocad-mcp](https://github.com/varavista/autocad-mcp) | 84 | A |
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| 3 | [beiming183-cloud/AutoCAD-MCP](https://github.com/beiming183-cloud/AutoCAD-MCP) | 83 | A |
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| 4 | [LokmenoWer/best-cad-mcp](https://github.com/LokmenoWer/best-cad-mcp) | 74 | B |
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| 5 | [AnCode666/multiCAD-mcp](https://github.com/AnCode666/multiCAD-mcp) | 73 | A |
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| 6 | [puran-water/autocad-mcp](https://github.com/puran-water/autocad-mcp) | 70 | A |
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| 7 | [NCO-1986/AutoCAD_mcp](https://github.com/NCO-1986/AutoCAD_mcp) | 68 | B |
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| 8 | [daobataotie/CAD-MCP](https://github.com/daobataotie/CAD-MCP) | 35 | B |
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| 9 | [zh19980811/Easy-MCP-AutoCad](https://github.com/zh19980811/Easy-MCP-AutoCad) | 30 | C |
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Fixed public 100-point rubric — CAD breadth (25), correctness and delivery
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(20), backends/platforms (15), engineering production (15), tests and
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maintenance (15), security and operations (10) — applied to the public source
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and documentation of each project
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([`benchmarks/source_review.json`](benchmarks/source_review.json), dated).
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Stars and raw tool counts score nothing. Evidence grade **A** = source plus
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locally executed evidence, **B** = deep source review without a full live run,
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**C** = documented tool surface only. This is a source review, not a shared
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live run — the lanes below are the runtime evidence.
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```bash
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python -m benchmarks.render_chart
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```
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### 1 · Live-run scores — same harness, pinned competitors
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| Server | Pinned commit | Score | Pass | Coverage |
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|---|---|---:|---:|---:|
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| **autocad-mcp-pro** (this repo) | working tree | **100.0** | 10/10 | 100% |
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| [beiming183-cloud/AutoCAD-MCP](https://github.com/beiming183-cloud/AutoCAD-MCP) | `11f7c47` | 50.0 | 5/10 | 50% |
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| [puran-water/autocad-mcp](https://github.com/puran-water/autocad-mcp) | `95476a3` | 45.0 | 4/10 | 50% |
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Ten fixed tasks, one runner, headless ezdxf lane. Competitors are driven
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**black-box over MCP stdio** using their own documented tool contracts at the
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pinned commit, and every geometry claim is verified by re-opening the exported
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DXF with ezdxf inside the harness — no self-reporting. `unsupported` scores
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zero in the fixed matrix; per-task reasons are committed under
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[`benchmarks/results/published/`](benchmarks/results/published/). File-IPC
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(live AutoCAD) lanes run locally, not in CI.
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```bash
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python -m benchmarks.run_competitors --server puran-water-autocad-mcp --backend ezdxf
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python -m benchmarks.run_competitors --server beiming183-autocad-mcp --backend ezdxf
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python -m benchmarks.render_live_chart
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```
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### 2 · Task matrix — where the score comes from
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The single score hides *which* capabilities exist, so the matrix shows every
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task against every server: green = verified pass, amber = partial, gray = the
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server documents no equivalent (planning, refinement, TABLE/MLEADER, hashed
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delivery), red = attempted but failed verification.
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```bash
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python -m benchmarks.render_matrix_chart
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```
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### 3 · Headless performance — scale evidence
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| Workload | Wall time | Throughput / result |
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|---|---:|---|
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| Create 2,000 lines (individual calls) | 0.64 s | ~3,100 entities/s |
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| 10,000 lines: build + DXF export + reopen | 13.9 s | ~700 entities/s end-to-end |
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| Region query over 10,000 entities | 3.4 s | 2,500 matched |
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| Premium pass (layers + part + dims + full critique) | 0.32 s | 0 issues |
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Workloads call the same backend methods the MCP tools call, so server-side
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overhead is included. Self-measurement only — competitor servers would pay an
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extra stdio serialization cost that in-process runs do not, so no cross-server
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timing claims are made. Numbers move with hardware; the machine fingerprint is
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recorded in the report.
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```bash
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python -m benchmarks.perf_suite --out benchmarks/results/published/perf-ezdxf.json
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python -m benchmarks.render_perf_chart
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```
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### 4 · Version A/B — every release re-proves correctness
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`compare_versions.py` runs the same 21 deterministic, headless correctness
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checks against the previous release tag and the current tree — each check in
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its own subprocess, so a hard crash counts as a miss instead of killing the
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run.
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**v1.4.0 release gate** (baseline `v1.3.0`, report:
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[`ab-v1.3.0-vs-v1.4.0.json`](benchmarks/results/published/ab-v1.3.0-vs-v1.4.0.json)):
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| Version | Checks passing | Pass rate | Fixed | Regressed |
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|---|---:|---:|---:|---:|
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| v1.3.0 (baseline) | 21 / 21 | 100 % | — | — |
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| **v1.4.0** (this release) | **21 / 21** | **100 %** | 0 | **0** |
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v1.4.0 added CI, packaging, benchmarks, tool profiles, paper space, ISO 286
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fits and opt-in 3D solids **without breaking a single correctness check**.
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For contrast, the same suite caught the v1.0.0 → v1.1.0 jump:
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| Version | Checks passing | Pass rate |
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| v1.0.0 (first public release) | 8 / 21 | 38.1 % |
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| v1.1.0 | 21 / 21 | 100 % |
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```bash
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python benchmarks/compare_versions.py v1.3.0 --json ab.json
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```
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Full rubric, caveats, method and boundaries for every lane:
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[`benchmarks/README.md`](benchmarks/README.md).
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## What ships in v1.4
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| Area | Tools |
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| Drawing lifecycle | create, open, save, export DXF/PDF, audit, purge, undo/redo |
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| Geometry | lines, arcs, polylines, splines, hatches, trim/extend/fillet/chamfer, handle-preserving edits |
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| Annotation | ISO 129 toleranced dimensions, **ISO 286 fits** (`fit="H7"`), TABLE, MLEADER, GD&T frames + datums (ISO 1101) |
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| Engineering generators | involute gears (front + section A-A), DIN 6885 keyed bores, ISO A3 titleblock |
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| **Paper space** *(new)* | `layout_list/create/set_current`, scaled `viewport_create`, `drawing_export_pdf(layout=...)` |
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| **3D solids** *(new, opt-in)* | `solid_box/cylinder/extrude/revolve/boolean` on live AutoCAD (`ENABLE_3D=true`) |
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| Quality loop | `drawing_preflight` → `drawing_plan` → `drawing_critique` → `drawing_refine` → `drawing_finalize` (0-100 score) |
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| Delivery | `drawing_deliver`: DXF/PDF/PNG + SHA-256 manifest + reopen-parity checks |
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| Discovery | **tool profiles** *(new)*: `TOOL_PROFILE=lean` (~46 tools) / `core` / `full` for clients with tight tool caps |
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The tool surface evolves — ask `system_about` for the live grouped inventory
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and `system_capabilities` for per-backend support modes instead of copying
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lists from this README.
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## Architecture
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```mermaid
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flowchart LR
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A[MCP host / AI agent] --> B[FastMCP server]
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B --> C[Error - audit - timing - logging middleware]
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C --> D[Typed tool contract + tool profiles]
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D --> E[COM backend]
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D --> F[ezdxf backend]
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E --> G[Live AutoCAD]
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F --> H[Headless DXF]
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E --> I[Engineering quality + delivery]
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F --> I
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```
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- `server.py` — FastMCP surface, lifespan, middleware, resources, prompts.
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- `backends/base.py` — shared typed contract + capability model.
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- `backends/com_backend.py` — single-STA-thread COM executor with per-call
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timeouts.
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- `backends/ezdxf_backend.py` — `asyncio.to_thread`-wrapped DXF engine with
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snapshot transactions.
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- `engineering/` — standards-aware planning, generators, critique, scoring,
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fits, refinement, validation, delivery.
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- `security.py` — path validation and command/AutoLISP sanitization.
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## Backend capabilities
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| Capability | COM backend | ezdxf backend |
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|---|:---:|:---:|
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| Live AutoCAD document control | ✓ | — |
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| Headless DXF creation and editing | — | ✓ |
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| Cross-platform execution | — | ✓ |
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| Transactions and rollback | ✓ | ✓ |
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| Paper-space layouts + viewports | ✓ | ✓ |
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| Viewport model-content rendering | ✓ | — |
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| TABLE and MLEADER semantics | Native | Portable composite |
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| 3D solids (opt-in) | ✓ | — (no headless ACIS) |
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| Screenshots | AutoCAD window | Matplotlib render |
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| Raw AutoCAD commands / AutoLISP | Opt-in | — |
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`system_capabilities` returns this machine-readably (`native`, `composite`,
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`rendered`, `snapshot`, `shared`, `unsupported`) — use it at runtime instead of
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assuming.
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## A production drawing workflow
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```text
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drawing_preflight → drawing_plan → drawing_apply_iso_layers
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→ deterministic create/edit tools → dimension_auto (+ fit="H7" callouts)
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→ drawing_critique → drawing_refine
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→ layout_create + viewport_create → drawing_finalize → drawing_deliver
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```
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## Connect an MCP client
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### Claude Desktop / Cursor / any stdio host
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```json
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{
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"mcpServers": {
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"autocad": {
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"command": "autocad-mcp",
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"env": {
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"AUTOCAD_MCP_BACKEND": "auto",
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"ALLOWED_PATHS": "C:\\Users\\you\\Documents\\AutoCAD",
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"TOOL_PROFILE": "full"
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}
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}
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}
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}
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```
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After `pip install autocad-mcp-pro` the `autocad-mcp` command is on PATH; from
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a checkout use `"command": "python"`, `"args": ["path/to/server.py"]`. The
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model vendor is not part of the server contract.
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### Local HTTP
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```bash
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autocad-mcp --transport http --port 8000
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```
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Loopback only by default; a non-loopback bind is refused unless remote HTTP is
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explicitly enabled **and** a bearer token is configured.
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## Configuration
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| Variable | Default | Purpose |
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| `AUTOCAD_MCP_BACKEND` | `auto` | `auto`, `com`, or `ezdxf` |
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| `TOOL_PROFILE` | `full` | `lean` (~46 curated tools), `core` (hides escape hatches), `full` |
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| `ENABLE_3D` | `false` | Expose the opt-in `solid_*` tools (COM backend) |
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| `LOG_LEVEL` | `INFO` | Python logging level |
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| `ALLOWED_PATHS` | empty | Comma-separated absolute paths the server may access |
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| `MAX_UNDO_STACK` | `5` | Maximum retained undo snapshots |
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| `MAX_DXF_BYTES` | `52428800` | Reject larger DXF input; `0` disables |
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| `MAX_LIST_LIMIT` | `5000` | Bound list/selection response sizes |
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| `COM_CALL_TIMEOUT` | `60` | Per-call live AutoCAD timeout (seconds) |
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| `DANGEROUS_COMMANDS_ENABLED` | `false` | Allow blocked commands/LISP; reported as unsafe mode |
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| `ALLOW_REMOTE_HTTP` | `false` | Permit a non-loopback HTTP bind |
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| `MCP_AUTH_TOKEN` | empty | Bearer token required for remote HTTP |
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## Security model
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Tool input is treated as untrusted:
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- every path passes traversal + allowed-root validation;
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- dangerous AutoCAD commands and AutoLISP channels are blocked by default,
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with regression tests for known bypass patterns;
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- remote HTTP requires explicit opt-in plus a bearer token;
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- DXF size, response sizes, undo history and COM call duration are bounded;
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- audit middleware records tool timing and failures;
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- `system_status` / `system_about` expose `unsafe_mode` when dangerous
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operations are enabled.
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Please report vulnerabilities privately via [GitHub](https://github.com/U-C4N)
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rather than public issues.
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## Development
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```bash
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pip install -e ".[full]"
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pip install pytest pytest-asyncio pytest-cov ruff build
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python -m pytest # 474 tests
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python -m ruff check . && python -m ruff format --check .
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python -m build
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```
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CI runs the same gates on Linux (3.11/3.12), Windows (mocked-COM suite),
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plus package, Docker and MCP-registry-schema jobs. Releases are tag-driven:
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`git tag vX.Y.Z && git push origin vX.Y.Z` builds, publishes to PyPI and cuts
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the GitHub Release. See
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[`docs/RELEASE-DISTRIBUTION.md`](docs/RELEASE-DISTRIBUTION.md).
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Repository map:
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```text
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server.py FastMCP surface and orchestration
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config.py Environment-driven settings
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security.py Path, command, and AutoLISP guards
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version.py Canonical package version
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backends/ COM and ezdxf implementations
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engineering/ Standards, generators, critique, fits, delivery
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benchmarks/ Runners, adapters, published reports, chart renderers
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tests/ Headless, mocked-COM, contract, and security tests
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```
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## Roadmap (1.5)
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Screenshot overlay + handle grounding, ezdxf redo (forward snapshots), COM
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`block_create_from_entities`, ISO 286 transition/interference hole letters
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(delta rule), titleblock on paper-space layouts. Features are published when
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their contracts and limitations are testable — not when they make a longer
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checklist.
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## Contributing
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Pull requests are welcome — especially reproducible competitor adapters,
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mocked/live COM coverage, engineering standards, and backend parity. For a
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large change, open an issue first so the tool contract and evidence plan can
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be agreed before implementation.
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## Author
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**Umutcan Edizsalan** · Mechanical engineering work at **Anka-Makine** ·
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GitHub [@U-C4N](https://github.com/U-C4N)
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Built from production drawing work, then made model-agnostic through MCP.
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## License
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[MIT](LICENSE)
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<!-- MCP registry ownership marker; must equal the "name" in server.json. -->
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mcp-name: io.github.u-c4n/autocad-mcp
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