AgentFEM MCP

One finite-element platform. Any compatible agent. Evidence intact.

AgentFEM MCP gives Codex, Claude, and other MCP-compatible agents a small, stable tool surface for building and running inspectable finite-element projects. AgentFEM remains the deterministic scientific engine; the agent interprets intent and explains evidence.

It exposes seven tools—not hundreds of solver internals:

Bring it to life

AgentFEM must already be installed. With uvx, Codex needs one command and the adapter remains isolated from the numerical environment:

codex mcp add agentfem \
  --env AGENTFEM_MCP_ROOTS=/absolute/path/to/AgentFEMProjects \
  -- uvx --from agentfem-mcp agentfem-mcp

Or install the lightweight adapter in the active environment:

python -m pip install agentfem-mcp

The 0.1.0 lifecycle is acceptance-tested with the public AgentFEM 0.3.3 CLI contracts and the current 0.3.7 development line.

Give your agent a project root, not your whole home directory.

Codex

Codex officially supports local stdio MCP servers. Confirm the connection with codex mcp list, then begin with:

Use AgentFEM to create, validate, run, verify, and briefly explain a 2D cantilever. Keep the project and result paths visible.

Claude Desktop and compatible clients

Claude Code:

claude mcp add agentfem --scope user \
  --env AGENTFEM_MCP_ROOTS=/absolute/path/to/AgentFEMProjects \
  -- uvx --from agentfem-mcp agentfem-mcp

Claude Desktop configuration:

{
  "mcpServers": {
    "agentfem": {
      "command": "agentfem-mcp",
      "env": {
        "AGENTFEM_MCP_ROOTS": "/absolute/path/to/AgentFEMProjects"
      }
    }
  }
}

If a desktop app cannot see the activated conda environment, set AGENTFEM_COMMAND to the absolute agentfem executable. The official macOS runtime, AgentFEM WSL2 runtime, and common agentfem-env/fenicsx-env layouts are also detected automatically.

VS Code and other models

VS Code can place the same local server in .vscode/mcp.json:

{
  "servers": {
    "agentfem": {
      "type": "stdio",
      "command": "uvx",
      "args": ["--from", "agentfem-mcp", "agentfem-mcp"],
      "env": {
        "AGENTFEM_MCP_ROOTS": "${workspaceFolder}"
      }
    }
  }
}

The server is model-neutral. A DeepSeek or other model can use it through any host that implements local MCP tools. ChatGPT connectors require a public HTTPS server; AgentFEM will add that route only with a real authenticated compute and artifact boundary, rather than silently uploading local models through this adapter.

Local Codex plugin

This repository contains a portable AgentFEM workflow skill and a local Codex marketplace under .agents/plugins/. It combines scientific operating guidance with the same MCP server; it does not create a second solver interface.

The contract

AI agent
   │  seven typed MCP tools
   ▼
AgentFEM MCP ── process + path boundary
   │  versioned JSON contracts
   ▼
AgentFEM CLI → Study → Model → Step → SimulationResult
   ▼
FEniCSx / PETSc / MPI

• No language model or API key is embedded in AgentFEM MCP.
• No shell command or arbitrary Python string is accepted from a tool call.
• All project paths must remain under explicitly approved roots.
• Numerical runs occur in child processes, isolating PETSc/MPI lifetime from the MCP server.
• completed, verified, and validated remain different scientific states.

Environment controls

With no root configured, the server restricts access to its working directory. The default maximum is 16 MPI ranks and can only be changed by the server operator, not by an agent tool call.

Development

python -m pip install -e '.[test]'
ruff check .
pytest
python -m build

See SECURITY.md for the trust boundary and CONTRIBUTING.md for contribution expectations. The first release evidence records protocol, package, and real-solver acceptance separately.

AgentFEM MCP is Apache-2.0 licensed and maintained as an official companion to AgentFEM.