Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
FEA (finite element analysis)
Overview
Description from the maker (original English)
Real FEA on CAD parts: validated setups, stress, safety factor, natural frequencies
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These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Other
- You need to fill in: Authorization
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- You fill in yourself:
Authorization
Values marked secret are keys to your account. Never share them or paste them into a chat.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.
Run this in your terminal
claude mcp add --transport http fea https://therobomaster123--mcp-fea-mcp-endpoint.modal.run/mcp --header 'Authorization: your-value'Fill in the empty values before running it.
Or copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"fea": {
"url": "https://therobomaster123--mcp-fea-mcp-endpoint.modal.run/mcp",
"headers": {
"Authorization": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"fea": {
"type": "http",
"url": "https://therobomaster123--mcp-fea-mcp-endpoint.modal.run/mcp",
"headers": {
"Authorization": "your-value"
}
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
This address needs a key in a request header, which the add-connector menu cannot set. Use Claude Code, Cursor or VS Code instead.
Your choice stays on this device in a cookie; no account needed.
Values you fill in
Authorizationsecret required HTTP headerBearer token issued by the operator (value of the mcp-fea-token Modal secret, as 'Bearer ')
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account TheRoboMaster123, which owns the repo
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Otheri
- More stars than 0% of the other 32688 servers in this category
- Published to the registry more recently than 21% of the other 32688 servers in this category
- Basic checks equal to or better than 100% of the other 32688 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is FEA (finite element analysis) safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
You need to fill in: Authorization
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 3 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, 御府和田玉 在售作品查询
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Remote Desktop Commander
by desktop-commander
Remote Desktop Commander: use files, terminal and processes on your own computers from any AI app.
Runs in the cloud★ 211Updated 2 days ago
Install
御府和田玉 在售作品查询
by 163yu.com
Live in-stock Hetian jade from Yufu, Shanghai: prices, monthly price guide, book a viewing.
Runs in the cloudUpdated today
Install
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
mcp-fea
Real finite element analysis from a conversation. An AI assistant sends a STEP file and a plain-English question ("does this arm survive a 6 g maneuver with a 400 g motor?"); this MCP server maps the words onto geometry, rejects bad setups deterministically before any compute is spent, meshes and solves with CalculiX on Modal as an async MCP task, and returns a verdict backed by numbers — peak von Mises stress, factor of safety, deflection, natural frequencies — plus rendered stress plots and an interactive 3D viewer. Every study ends with a non-skippable reaction-balance check; every benchmark on the validation page is regenerated by CI on every commit.
*Measured on the live deployment (2026-07-31): cold start 3.8 s · cantilever study submit→completed 9.3 s warm / 12.9 s with a cold solver container · ~$0.002 per study at Modal's posted rates.*
| Benchmark | Reference | Computed | Error |
|---|---|---|---|
| Cantilever tip deflection (PL³/3EI) | 0.58055 mm | 0.58046 mm | 0.02% |
| NAFEMS LE10 σ_yy @ D | −5.38 MPa | −5.456 MPa | 1.41% |
| Plate-with-hole peak (Heywood Kt) | 62.8 MPa | 61.92 MPa | 1.40% |
| Cantilever f₁ (Euler–Bernoulli) | 816.0 Hz | 815.4 Hz | 0.08% |
Full table, mesh stats, and an explicit limitations section: [docs/validation.md](docs/validation.md) — regenerated by CI, never hand-edited.
Protocol: MCP 2026-07-28 (stateless core) with the io.modelcontextprotocol/tasks extension implemented per SEP-2663 (the official Python SDK v2 shipped without it — this repo also contains the client-side extension that teaches the official SDK to consume task-augmented servers) and an MCP Apps (SEP-1865) 3D viewer. See docs/decisions.md for every engineering call and why.
Deploy (3 commands)
uv syncuv run modal secret create mcp-fea-token MCP_FEA_TOKEN=$(openssl rand -hex 24) uv run modal deploy -m src.server.modal_app
Modal prints the endpoint URL (https:// --mcp-fea-mcp-endpoint.modal.run). Connect any 2026-07-28 MCP client with Authorization: Bearer . First-time Modal users: uv run modal token new once. Then verify the live deployment end to end:
MCP_FEA_LIVE_URL=https://... MCP_FEA_TOKEN=... make verify-liveTools
| Tool | Sync/async | What it does |
|---|---|---|
inspect_geometry | sync | STEP → face table (face_id, type, centroid, normal/axis, area, bbox) + part bbox/volume. Call first: it's how English maps to face ids. |
list_materials | sync | Built-in library: Al 6061-T6, Al 7075-T6, Steel 4140, Stainless 304, Ti-6Al-4V, ABS, PLA, Nylon 12, PC (E, ν, yield, density). |
submit_fea_study | task | Linear static: validate → mesh (C3D10, curvature-adaptive, local thin-wall refine) → CalculiX → verdict/stress/FoS + 3 stress PNGs. |
submit_modal_study | task | Natural frequencies + mode shapes (*FREQUENCY), first N modes (default 6), one exaggerated-deformation PNG per mode. Requires constraints and density. |
get_report | sync | Full payload for a completed task; include_mesh_data: true adds the surface-mesh payload the 3D viewer app fetches. |
Task lifecycle: working (statusMessage walks validating → meshing → solving → postprocessing) → completed | failed | cancelled; tasks/cancel kills the running container. Tasks are retained 24 h.
Units policy
One conversion boundary, at ingest. Internally everything is consistent mm–N–MPa(–tonne): lengths mm, forces N, stress/moduli MPa, density tonne/mm³ (kg/m³ × 1e-12 — done once, in Material.density_tonne_mm3), which makes modal frequencies come out directly in Hz. STEP coordinates are interpreted in the *declared* units (mm|m|in); gmsh's own unit conversion is disabled so the declared unit is authoritative — and sanity-checked (a 100 mm part declared "m" gets flagged).
Validation codes
Every rejection returns {code, message, suggested_fix}.
| Code | Meaning | Stage |
|---|---|---|
GEOMETRY_REF_INVALID | STEP missing/unreadable/over 25 MB, bad units field | parse |
GEOMETRY_KERNEL_CRASH / GEOMETRY_TIMEOUT | CAD kernel crashed / hung on the file (isolated subprocess; endpoint unaffected) | inspect |
MATERIAL_UNKNOWN / MATERIAL_UNPHYSICAL | Not in library / E ∉ [0.01, 1500] GPa, ν ∉ (0, 0.5), yield ≤ 0, density ∉ [10, 25000] kg/m³, missing density for modal | parse |
CONSTRAINT_INVALID / CONSTRAINT_CONFLICT | Bad type; node pinned in two local frames | parse/deck |
LOAD_INVALID / LOAD_MISSING / MODAL_INVALID | Bad type/units/direction; zero loads; bad n_modes | parse |
GEOM_NO_SOLID / GEOM_MULTIPLE_SOLIDS | Not a single solid body (assemblies = v2) | pre-mesh |
FACE_ID_INVALID | Face id not on this part | pre-mesh |
RIGID_BODY_MOTION | Constraints leave free motion (named, e.g. "rotation about the hole axis") — SVD rank check | pre-mesh |
LOAD_ON_FIXED_FACE | Load applied to a fully fixed face | pre-mesh |
UNITS_SUSPECT *(warning)* | Part > 5 m or < 0.5 mm — declared units probably wrong | pre-mesh |
LOAD_MAGNITUDE_EXTREME / _NEGLIGIBLE *(warnings)* | σ ≈ F/A > 10× yield or < 1e-6× yield | pre-mesh |
MESH_ELEMENT_CAP | > 400k elements even after coarsening / local refine | mesh |
MESH_QUALITY_JACOBIAN / MESH_QUALITY_ASPECT / MESH_THIN_WALLS | Quality gates; thin walls get one local auto-refine first | mesh |
MESH_TIMEOUT | Meshing exceeded its wall budget (near-tangent slivers, helical threads) — the worker is killed from outside | mesh |
SOLVER_SINGULAR / SOLVER_MESH_DEGENERATE / SOLVER_TIMEOUT / SOLVER_FAILED | Mapped ccx failures (>150k elements auto-switch to the iterative solver) | solve |
EQUILIBRIUM_FAIL *(warning, untrusted result)* | ΣRF vs free-node applied loads off by > 0.5% | post |
LOAD_INTO_SUPPORT *(warning)* | > 5% of the load lands on constrained nodes (loaded face touches a fixed face) and is carried directly by the support | post |
BEYOND_YIELD / LARGE_DEFLECTION *(warnings)* | FoS < 1 (post-yield numbers flagged non-physical) / u > 5% of min dimension | post |
Abuse limits (all env-tunable)
25 MB STEP cap · 40 MB request cap (413) · per-token rate limit (MCP_FEA_RATE_LIMIT/_WINDOW_S, 429) · concurrent-solve cap (MCP_FEA_MAX_CONCURRENT) · daily budget (MCP_FEA_MAX_SPAWNS_PER_DAY) · kill switch (MCP_FEA_DISABLE_SPAWN=1). CAD parsing never runs in the endpoint process (see SECURITY.md).
Local development
uv synccurl -Ls https://micro.mamba.pm/api/micromamba/osx-arm64/latest | tar -xj bin/micromamba ./bin/micromamba create -y -p .tools/ccx-env -c conda-forge calculix=2.23 make test # fast suite (protocol, benchmarks, validation, hardening) make torture # 21 real-world STEP files through the endpoint make validation-page uv run uvicorn --factory src.server.app:create_local_app --port 8000 # local server
Repo map
src/pipeline/ geometry, meshing, deck, solver, validation, post, render · src/materials/ library · src/server/ protocol, tools, tasks, limits, worker host, Modal app, Apps UI · src/client/ SDK tasks extension · tests/ (incl. torture/) · demo/ · docs/ decisions, validation, upstream notes. License: Apache-2.0.