anvil-mcp

Anvil — a full workbench for your agent.

No cloud. No Bridge. No API key. No LLM inside — the tools are pure computation; your agent host brings the thinking.

Plain words in — your agent forges the design, tests it against proof metrics, iterates until it passes, and hands you the file. You never touch a tool.

30 seconds

server.ts

you:    "I need a 5-stage CMOS ring oscillator at 7nm — prove it works
         before I print anything."

agent:  anvil.forge  → blueprint: silicon · 8 nodes · "5-stage ring at 7 nm, VDD 0.75 V."
        anvil.solve  → [pass] Joule power · [pass] junction temp · [warn] EM margin thin
        anvil.forge  → widens the vias, re-forges
        anvil.solve  → all metrics pass
        anvil.export → 532 triangles of ASCII STL

you get: the printable file, plus the proof it works.

Install

Requires Node ≥ 20. No build step needed for use:

Terminal

npx github:The-Warl0ck/anvil-mcp

Or clone and run:

git clone https://github.com/The-Warl0ck/anvil-mcp
cd anvil-mcp
npm install
npm run build
npm start

Claude Desktop

Add to your claude_desktop_config.json:

config.json

{
  "mcpServers": {
    "anvil": {
      "command": "npx",
      "args": ["github:The-Warl0ck/anvil-mcp"]
    }
  }
}

Tools

Tool	Input	Output
`anvil.domains`	`{}`	The 12 domains and what each simulates
`anvil.forge`	`{ intent, domain? }`	Blueprint JSON + rationale (offline — no LLM in the tool itself)
`anvil.solve`	`{ blueprint, steps? }`	SimSnapshot + ProofMetric[] with real numbers
`anvil.export`	`{ blueprint, format }`	STL (ASCII) or OBJ text for 3D printing / CAD

The 12 domains

silicon (nets, delay, heat, electromigration) · cellular (membranes, ions, morphogens) · quantum (wells, tunneling, decoherence) · neural (spikes, region flows) · mechanical (stress, modes, yield) · chemistry (mass-action kinetics, ΔH, equilibrium) · architecture (plans, interiors, circulation) · metallurgy (alloys, CE, melt, print window) · robotics (arms, torque, reach, payload) · machines (engines, gears, printable parts) · optics (geometry, gnomon, shadows, sundials) · sky (sun position / ephemeris)

How it works

anvil.forge — readIntent scores your words against per-domain keyword sets, picks a domain, and forgeOffline builds a schematic graph (nodes, edges, physical params) from templates plus your numbers (e.g. "7nm", "5-stage", "0.75 V"). Pure local compute.
anvil.solve — createSolver dispatches to the domain solver (Kirchhoff MNA for silicon, Euler–Bernoulli for mechanical, mass-action for chemistry, …), steps it, and returns a snapshot plus proof metrics — checks with real tolerances and statuses.
anvil.export — blueprint geometry meshed to ASCII STL or OBJ text.

Everything runs in-process. There is no network call anywhere in the default path.

Config

Optional — nothing is required to run:

ANVIL_HOME=~/.anvil   # where saved designs / assets / exports live (default ~/.anvil)

Notes

Any OpenAI-compatible "mouth" (LM Studio, etc.) is a future opt-in, not part of v1. The kernel speaks blueprints, not prose, and that's the point.
anvil.solve returns a deterministic snapshot after N steps of the solver's recommended dt — no wall-clock randomness.
Apache-2.0. See LICENSE.