Umut CANandClaude Opus 5
dcc8f07bf4
Layer states are ACADMCP_LAYERSTATES XRECORD chunks (<= 255 ASCII chars each), in the file and not in AutoCAD's Layer States Manager. Headless view restore writes the *Active VPORT (ezdxf's header has no $VIEWCTR; measured). UCS is stored and made current; tool coordinates stay WCS. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd
310 lines
22 KiB
Markdown
310 lines
22 KiB
Markdown
<div align="center">
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# AutoCAD MCP Pro
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**Production-grade AutoCAD automation for AI agents.**
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Live through COM on Windows, or headless through ezdxf anywhere — one typed contract, two engines.
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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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[](https://pypi.org/project/autocad-mcp-pro/)
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[](https://github.com/U-C4N/Autocad-MCP/blob/main/pyproject.toml)
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[](https://github.com/U-C4N/Autocad-MCP/blob/main/LICENSE)
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[Install](#install) · [Tools](#what-you-get) · [Engines](#the-two-engines) · [Evidence](#evidence) · [Limits](#what-this-release-is-bad-at) · [Config](#configuration) · [Changelog](https://github.com/U-C4N/Autocad-MCP/blob/main/CHANGELOG.md)
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<img src="https://raw.githubusercontent.com/U-C4N/Autocad-MCP/main/docs/assets/autocad-mcp-showcase.png" alt="ISO A3 sheet: a module-6, 24-tooth spur gear with a keyed bore, its section A-A, ISO 129 dimensions with an H7 bore fit, and an ISO 7200 title block" width="800">
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<sub><b>Not a mockup.</b> Every line on this sheet was drawn by the tools this server exposes — ISO layers, involute gear geometry, DIN 6885 keyway, section A-A, ISO 129 dimensions, an ISO 286 <code>H7</code> bore fit, ISO 7200 title block — then rendered headlessly by <code>view_screenshot</code>. <code>drawing_critique</code> returns <b>0 issues</b> on it. Rebuild it with <code>python scripts/render_readme_showcase.py</code>.</sub>
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<img src="https://raw.githubusercontent.com/U-C4N/Autocad-MCP/main/docs/assets/pid-showcase.png" alt="P&ID sheet: a centrifugal pump, a diaphragm-actuated globe control valve, a vertical vessel with two nozzles, a flow controller bubble and an off-page connector, joined by numbered process lines and an electric signal line" width="800">
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<sub><b>The same server as a P&ID drafter.</b> <code>pid_from_spec</code> placed five catalogue symbols as real blocks with <code>TAG</code> attributes and named ports, routed four port-to-port lines with ISA-5.1 classes and line numbers in one transaction, then <code>pid_graph</code> read the sheet back: 5 nodes, 4 edges, 0 dangling ends, <code>confidence_min</code> 1.0. Rebuild it with <code>python scripts/render_readme_pid.py</code>.</sub>
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<img src="https://raw.githubusercontent.com/U-C4N/Autocad-MCP/main/docs/assets/pid-catalog.png" alt="Contact sheet of the 43 P&ID catalogue symbols: valve bodies with actuators, pumps and compressors, heat exchangers, vessels, instrument bubbles, line markers and connectors" width="800">
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<sub><b>The catalogue, authored in code.</b> 43 ISO 10628-2 / ISA-5.1 symbols — 11 valve bodies × 6 actuators, 6 rotating machines, 4 heat exchangers, 6 parametric vessels, 7 inline items, the instrument bubble in 4 types × 5 locations, 5 line markers, 3 connectors — every one placed through <code>pid_symbol_insert</code>'s own path. Rebuild it with <code>python scripts/render_pid_catalog.py</code>.</sub>
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</div>
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> **v1.5 release snapshot:** 179 tools · 8 resources · 5 prompt templates · 2423 collected tests.
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> 179 is the **registered** count; a default install advertises 174 over `tools/list`,
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> because `ENABLE_3D` is unset. `system_about` is the runtime authority.
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## Why this exists
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**A big MCP server is expensive to be connected to.** The full catalog costs a client **44,930 tokens** before it has asked for anything. Discovery mode replaces it with two tools and costs **356**.
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**A drafter searches for `FILLET`, not `entity_fillet`.** Those command names appeared in no tool name or description — `df = 0` against a stock index, not badly ranked but *absent*. The fix was data: an authored corpus of **162 AutoCAD command names and 731 synonym phrases** covering all 166 tools. A test refuses to let a tool exist without one.
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| Advertised surface | Tools seen | Idle cost |
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|---|---:|---:|
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| `TOOL_PROFILE=full` (default) | 161 | 44,930 tokens |
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| `TOOL_PACKS=core` (full profile) | 152 | 41,420 tokens |
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| `TOOL_PROFILE=lean` | 50 | 14,007 tokens |
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| `DISCOVERY_MODE=search` | 2 | **356 tokens** |
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> [!NOTE]
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> Offline ratio estimates, not tokenizer counts, and the *uncached* ratio — prompt caching amortises the idle term. `benchmarks/token_suite.py --tokenizer anthropic` counts for real.
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## Install
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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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```bash
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AUTOCAD_MCP_BACKEND=ezdxf autocad-mcp # portable DXF engine, no AutoCAD needed
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AUTOCAD_MCP_BACKEND=com autocad-mcp # live AutoCAD (needs the [com] extra)
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```
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| Extra | Pulls in | For |
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| *(none)* | `fastmcp`, `ezdxf`, `pydantic` | Headless DXF on any OS — **no rendering** |
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| `[com]` | `pywin32`, `Pillow` | Live AutoCAD control + window capture |
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| `[pdf]` | `matplotlib` | PDF export and headless PNG, any platform |
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| `[full]` | everything above | Development and CI |
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> [!NOTE]
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> The bare install **cannot draw pixels** — `ezdxf.addons.drawing` imports Pillow unconditionally, so every render path needs it. Add `[pdf]` for images on Linux or macOS.
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<details>
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<summary><b>Wire it to an MCP client</b></summary>
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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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"DISCOVERY_MODE": "off"
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}
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}
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}
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}
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```
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Claude Desktop, Cursor, or any stdio MCP host. For HTTP: `autocad-mcp --transport http --port 8000` — loopback only unless remote HTTP is explicitly enabled **and** a bearer token is set.
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</details>
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## What you get
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| Area | What it does |
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| Drawing lifecycle | create, open, save, export DXF/PDF, audit *(repairs)*, 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 and datums (ISO 1101) |
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| Engineering generators | involute gears (front + section A-A), DIN 6885 keyed bores, ISO A3 title block |
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| P&ID | catalogue blocks with ports and tags (ISO 10628-2 / ISA-5.1), port-to-port lines with ISA-5.1 classes and line numbers, `pid_graph` reads any P&ID back with confidence, instrument index / line list / equipment list, `pid_from_spec` one-call sheets |
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| Discovery | `search_tools` ranked over an AutoCAD command and synonym corpus — `FILLET`, `BPOLY`, `QSELECT`, `WBLOCK`, `OVERKILL`, `CHSPACE` each rank **#1** of the 161-tool advertised catalog |
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| Batching | `cad_batch` runs a step list in one round trip; `fields=` projects 11 result-heavy tools |
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| Paper space | tab lifecycle, viewports, `entity_change_space` (CHSPACE), `drawing_export_pdf(layout=…)` |
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| Environment | `document_list/activate/close` — several drawings open at once on both engines; portable layer states (`ACADMCP_LAYERSTATES` XRECORDs — in the file, not in AutoCAD's Layer States Manager); named views; UCS stored and made current *(tool coordinates stay WCS)* |
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| Selection | window vs crossing stated back to the caller; a polygon tested against its own shape, not its bounding box |
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| Boundaries | `boundary_trace` (BOUNDARY/BPOLY) chains loose edges into one closed polyline, arcs kept as bulges *(headless)* |
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| Measurement | `analysis_measure_entity` measures what is *in* the drawing, by handle |
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| Hatch depth | gradients, in-place edits, typed edge boundaries *(headless)*, island styles |
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| Annotation objects | WIPEOUT, REVCLOUD, MTEXT background masks *(headless)*, text find/replace |
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| 3D solids | `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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<sub>166 tools in 20 groups; <code>TOOL_PACKS=core</code> hides the nine <code>pid_*</code> tools from a client that never draws a P&ID. Plus 8 resources that cost nothing in the tool budget (<code>autocad://drawing/info</code>, <code>layers</code>, <code>blocks</code>, <code>entities/stats</code>, <code>entities/{layer_name}</code>, <code>system/status</code>, <code>pid/symbols</code>, <code>standards/isa51</code>) and 5 prompt templates.</sub>
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**Two rules worth knowing.** Every coordinate in and out of a tool is WCS on both engines — the one exception is TEXT `rotation`, which stays in the entity frame because a mirrored TEXT is mirror-imaged and no scalar angle expresses that. And never read vertices back and shoelace them: that loses **28.2%** of the area on a semicircular edge, silently. `analysis_measure_entity(handle)` reads the real geometry and states its own accuracy.
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## The two engines
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One contract across 19 modules in `backends/contracts/`. `@capability(key, reason=…)` supplies a default that *refuses*, and a test holds both backends' capability key sets equal. There are **27 capability keys**; read `system_capabilities` at runtime rather than trusting the table — five of them depend on how the machine is set up.
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| Capability | COM (live AutoCAD) | ezdxf (headless) |
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|---|:---:|:---:|
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| Live document control | ✅ | — |
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| Cross-platform, no AutoCAD | — | ✅ |
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| Transactions and rollback | ✅ | ✅ |
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| Paper-space layouts + viewports | ✅ | ✅ |
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| Viewport model-content rendering | ✅ | ✅ ᵐ *(no borders)* |
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| Selection window / crossing / polygon | ✅ | ✅ |
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| Entity area by handle | ActiveX `.Area` | Analytic, bulges included |
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| HATCH filled area (islands subtracted) | AutoCAD's own number | Loops walked, `hatch_style` reported |
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| REGION / 3DSOLID area | ✅ | — *ACIS is opaque to ezdxf* |
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| 3D solids | ✅ *with `ENABLE_3D=true`* | — |
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| DWG write | ✅ | — |
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| WIPEOUT · MTEXT background colour | — *verified absent, AutoCAD 2026* | ✅ |
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| REVCLOUD · BPOLY · typed hatch edges | — *no ActiveX member* | ✅ |
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| CHSPACE | — *unverified on a live seat* | ✅ ᶜ |
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| Undo history | ✅ | opt-in — `EZDXF_UNDO_DEPTH` |
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| TABLE and MLEADER | Native | Portable composite |
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| Screenshots and PDF | Window capture | Matplotlib ᵐ |
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<sub>ᵐ Needs matplotlib (<code>[pdf]</code>/<code>[full]</code>); without it <code>png</code>, <code>pdf</code>, <code>viewport_render</code> and <code>handle_overlay</code> report unsupported headlessly.<br>
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ᶜ Headless CHSPACE carries four named restrictions in its capability reason: top-view untwisted viewports only, dimensions refused unless frozen, ACIS/proxy/table refused, viewport clipping reported rather than applied.</sub>
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> [!IMPORTANT]
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> Every COM path added in v1.5 was executed against a **live AutoCAD 2026**. That run found four defects reading could not — the largest being that `AcadPViewport` has no `ViewCenter` member, so the line setting it had been silently swallowed by a bare `except` since v1.4.
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## Evidence
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Self-measurement, produced by scripts in [`benchmarks/`](https://github.com/U-C4N/Autocad-MCP/blob/main/benchmarks/).
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### Correctness — every release re-proves itself
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29 deterministic headless checks against the previous tag and the current tree, each in its own subprocess so a hard crash counts as a miss rather than killing the run.
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| Version | Checks passing | Pass rate | Fixed | Regressed |
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|---|---:|---:|---:|---:|
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| v1.5.1 *(baseline)* | 26 / 29 | 89.7 % | — | — |
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| **v1.6.0-dev** *(this branch)* | **29 / 29** | **100 %** | 3 | **0** |
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The three fixed rows are the P&ID checks, new capability (`miss → pass`): `block_define` round-trips an ATTDEF, `pid_tag_parse` reads `FIC-101`, and `pid_graph` counts the example sheet's four edges. The 26 checks v1.5.1 was gated on all still pass. Against the older `v1.4.0` baseline the same 26 reported **21 / 26 → 26 / 26, five fixed, zero regressed** — two of those were repaired defects (`fail → pass`), the diameter and radius callouts, which measured the leader as geometry and dimensioned a 40 mm bore as 60 at default settings.
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### The task matrix — six tasks that can fail
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An earlier matrix scored this server 10/10, which carried no information: every task in it exercised something the server was built around. Five were added in 1.5 because they *can* fail, and three did while being written; 1.6 adds a sixth that the P&ID reader can fail on its own.
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| Task | Verified against |
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|---|---|
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| `tool_discovery` | six AutoCAD command names, each ranking #1 |
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| `token_budget` | 44,930 → 356 tokens, against a ceiling fixed in advance |
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| `hatch_islands` | 300 filled with the island, 400 ignoring it |
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| `selection_filter` | window 1, crossing 2, bounding box 3, polygon 1 |
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| `measure_from_handle` | 139.2699 against the 100.0 a vertex shoelace gives |
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| `pid_roundtrip` | the example sheet drawn by `pid_from_spec`, read back by `pid_graph`, which never sees the spec: 5 nodes, 4 edges, 0 dangling, `confidence_min` 1.0, `FIC-101` wired to `FCV-101` |
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### Headless performance
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<img src="https://raw.githubusercontent.com/U-C4N/Autocad-MCP/main/docs/assets/autocad-mcp-perf.svg" alt="Performance across four headless workloads" width="800">
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Workloads call the same backend methods the MCP tools call, so server-side overhead is included. Numbers move with hardware; the report records the machine fingerprint. **Read the next section before quoting them** — this release is slower than v1.4.0 at creating entities, on purpose.
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## What this release is bad at
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A page that only lists strengths is a page that has not been measured.
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**Entity creation is slower than v1.4.0.** Median of three runs on one machine and interpreter: 2,000 lines **1.4× slower**, the 10,000-line roundtrip **2.3× slower**. Attributed — setting `EZDXF_CALL_TIMEOUT=0` returns creation to v1.4.0's numbers. The cost is the per-call `asyncio.wait_for` wrapped around every headless call so one hung call can no longer wedge a server whose document lock is a single `asyncio.Lock`. Deliberate trade, documented knob, on the 1.6 roadmap. The premium quality pass went the other way — **3.7× faster**.
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**Wave A shipped 13 tools of a planned 39.** Every cut is backed by a measurement. The REGION and 2D-boolean family went because `add_region()` produces a REGION with **zero ACIS bytes**, and the `greiner_hormann` substitute loses **28.2%** of the area on a square with one semicircular edge.
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**`system_run_command` / `system_run_lisp` are a guardrail, not a security boundary** — the rejection message says so in those words. A 36-verb denylist refuses the obvious cases, but AutoCAD accepts hundreds of commands and `DANGEROUS_COMMANDS_ENABLED=true` switches it off entirely.
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**Path validation is per-tool, and unscoped until you scope it.** With `ALLOWED_PATHS` empty — the default — the only positive bound is a ten-entry system-directory denylist that does not include `C:/Users`, `/home`, `/root` or `/var`. **Set `ALLOWED_PATHS`.**
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**Non-AutoCAD ProgIDs are unverified.** `CAD_PROGID` changes which COM application the backend attaches to; nothing beyond the connection has been tested against BricsCAD, ZWCAD or GstarCAD.
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### Known limitations of the P&ID track
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**The router is orthogonal and blind.** `pid_line_draw` picks `auto` from seven orthogonal candidates — straight, one bend, two bends through the midline, or a stub out of each port joined by three bends — by fewest bends then length (or takes `direct`, or the waypoints you pass), and *counts* the lines it crosses — `crossings` comes back in every result and `pid_from_spec` sums it — but it does not route around them. Obstacle-avoiding routing is out of 1.6; move the symbol or pass waypoints.
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**A foreign drawing is read at the confidence it earns, and no higher.** A block this server did not place classifies by its `TAG`-style attribute or a keyword in its name at 0.6 with inferred ports, or at 0.3 when a line merely touches it — and a 0.3 guess can neither raise nor suppress a critique finding. On the live engine an INSERT turned off a right angle whose members ActiveX cannot measure reports an *approximate* box; `pid_graph` takes the tighter wall of that and the attribute-inclusive box on every side, but a line ending on such a body's true edge can still be reported `dangling` with the nearest port as the hint. Read `stats.confidence_min` first.
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**Same-file only, DXF headlessly.** Off-page connectors link within one drawing; links across files are not resolved. The headless engine reads DXF; a DWG P&ID is read through the live backend. No DEXPI/Proteus export and no ISA-5.2 binary-logic symbols in this release, recorded in the spec so nobody re-derives the cut.
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## Configuration
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Nothing loads a `.env` file — export these, or set them in your MCP client's `env` block.
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<details>
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<summary><b>All 17 environment variables</b></summary>
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| Variable | Default | Purpose |
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| `AUTOCAD_MCP_BACKEND` | `auto` | `auto`, `com`, or `ezdxf` |
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| `CAD_PROGID` | `AutoCAD.Application` | COM ProgID the live backend attaches to |
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| `TOOL_PROFILE` | `full` | `lean` (50 curated tools) or `full` |
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| `TOOL_PACKS` | `all` | Vertical packs to advertise: `core,pid` (`core` always on) |
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| `DISCOVERY_MODE` | `off` | `search` replaces the catalog with `search_tools` + `call_tool` |
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| `ENABLE_3D` | `false` | Expose the opt-in `solid_*` tools (COM) |
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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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| `EZDXF_UNDO_DEPTH` | `0` | Headless undo history depth; `0` disables it |
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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 (s); `0` disables |
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| `EZDXF_CALL_TIMEOUT` | `120` | Per-call headless timeout (s); `0` disables |
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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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</details>
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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 3 server]
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B --> C[Error · audit · timing · logging · capability-refusal middleware]
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C --> D[Typed contract · 19 modules · 27 capabilities]
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D --> E[COM backend<br/>single-STA thread]
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D --> F[ezdxf backend<br/>asyncio.to_thread]
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E --> G[Live AutoCAD]
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F --> H[Headless DXF]
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E --> I[Engineering · critique · scoring · delivery]
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F --> I
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```
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<details>
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<summary><b>The drawing at the top of this page, as tool calls</b></summary>
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The sequence in [`scripts/render_readme_showcase.py`](https://github.com/U-C4N/Autocad-MCP/blob/main/scripts/render_readme_showcase.py), which produced the hero sheet:
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```text
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drawing_new() ISO linetypes + layers bootstrapped
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drawing_apply_iso_layers("mech") ISO 128 lineweights per layer
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drawing_settings({units: "mm", linear_precision: 2})
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gear_draw_spur_front_view( involute flanks, not a decorated circle
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module=6, teeth=24, center=[135, 172],
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bore_diameter=40, keyway_width=12, keyway_depth=3.3)
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gear_draw_section_aa(x_offset=300, face_width=46)
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dimension_linear(...) ISO 129
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dimension_diameter(..., fit="H7") deviations from authored ISO 286 tables
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titleblock_apply_iso_a3(title="SPUR GEAR m6 z24", material="C45E", ...)
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drawing_critique(focus=None) -> [] must be empty before finalize
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view_screenshot() -> PNG
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```
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The full production loop adds `drawing_preflight` and `drawing_plan` at the front, `drawing_refine` after the critique, and `layout_create` + `viewport_create` + `drawing_deliver` at the end.
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</details>
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## Development
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```bash
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uv sync --locked --all-extras
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uv run pytest
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uv run ruff check . && uv run ruff format --check .
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```
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`uv.lock` pins the whole transitive graph, so this reproduces CI exactly. CI runs Linux (3.11 / 3.12), Windows (mocked-COM), plus package, Docker and MCP-registry jobs; the release gate runs the same three test lanes before anything reaches PyPI. Releases are tag-driven: `git tag vX.Y.Z && git push origin vX.Y.Z`.
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||
|
||
## Roadmap (1.6)
|
||
|
||
Give back the creation throughput the per-call timeout costs — arm it only for calls that can actually block. ISO 286 interference **shafts** r/s/t/u. HATCH boundary *geometry* in `entity_get` (1.5 measures a hatch's filled area but does not hand back its loops). REGION/3DSOLID area headlessly, which needs a modelling kernel ezdxf does not have. An *allowlist* of permitted AutoLISP heads, replacing the denylist — enumerating dangerous symbols does not terminate. `ezdxf.recover` as a fallback on `drawing_open`.
|
||
|
||
Features ship when their contracts and limitations are testable — not when they make a longer checklist.
|
||
|
||
## Star History
|
||
|
||
[](https://www.star-history.com/#U-C4N/U-Pool&U-C4N/Autocad-MCP&Date&legend=top-left)
|
||
|
||
## Author
|
||
|
||
**Umutcan Edizsalan** · Mechanical engineering work at **Anka-Makine** · GitHub [@U-C4N](https://github.com/U-C4N)
|
||
|
||
Built from production drawing work, then made model-agnostic through MCP.
|
||
|
||
## License
|
||
|
||
[MIT](https://github.com/U-C4N/Autocad-MCP/blob/main/LICENSE)
|
||
|
||
<!-- MCP registry ownership marker; must equal the "name" in server.json. -->
|
||
mcp-name: io.github.u-c4n/autocad-mcp
|