itasca-mcp-bridge 0.1.3

WebSocket bridge for ITASCA codes (PFC, FLAC3D, ...) - runs inside the product GUI to enable remote simulation control

itasca-mcp-bridge

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Runtime bridge that runs inside an ITASCA product process (PFC, FLAC3D, ...) and exposes the product's Python SDK as a WebSocket API, enabling execution tools for MCP servers such as pfc-mcp.

The bridge is product-neutral: its core mechanisms — console-output capture via program log, cycle callbacks via itasca.set_callback, and Python state persistence via python-reset-state — use the shared ITASCA command language / SDK and have been verified to behave identically on PFC and FLAC3D.

Quick Start

Run inside the product's Python (GUI IPython console or console CLI):

Install from PyPI

In the product's IPython console:

from pip._internal.cli.main import main as pip_main
pip_main(["install", "--user", "itasca-mcp-bridge"])

import itasca_mcp_bridge
itasca_mcp_bridge.start()

websockets is pulled in automatically with a version matched to the embedded Python (9.1 for Python 3.6, 16.0 for Python 3.10). If it is missing or mismatched, install it the same way (pip_main(["install", "--user", "websockets==9.1"]) on Python 3.6, websockets==16.0 on 3.10).

Run from a source checkout

%run C:/path/to/itasca-mcp-bridge/start_bridge.py

Use forward slashes in the path. Do not wrap it in quotes.

Code changes take effect on the next %run, so this is the preferred workflow during development.

The bridge auto-detects the runtime: a Qt timer in GUI mode, a blocking loop in console mode.

Expected output:

============================================================
Itasca MCP Bridge Server
============================================================
  URL:         ws://localhost:9001
  Log:         /your-working-dir/.itasca-mcp-bridge/bridge.log
  Callbacks:   Interrupt, Executor (registered)
============================================================

Requirements

• An ITASCA product with an embedded Python interpreter.
  • Verified: PFC 6.0 / 7.0 / 9.0.
  • FLAC3D: the bridge's core SDK/command mechanisms are verified compatible; full end-to-end validation is in progress.
• Python >= 3.6 (PFC 6/7 use Python 3.6; PFC 9 uses Python 3.10).
• websockets (==9.1 on Python 3.6, ==16.0 on Python 3.10), installed automatically as a dependency.

Troubleshooting

Symptom	Fix
Server won't start	Re-run the install/start steps in the product's IPython console; check .itasca-mcp-bridge/bridge.log
websockets version mismatch	In the product IPython console: from pip._internal.cli.main import main as pip_main; pip_main(["install", "--user", "websockets==16.0"]) (use 9.1 on Python 3.6)
Port in use	itasca_mcp_bridge.start(port=9002), then point your MCP client's bridge URL at ws://localhost:9002
Connection failed	Confirm the bridge is running and the port is reachable; see .itasca-mcp-bridge/bridge.log
No task execution / MCP cannot connect	If execution tools return ok=false, error.code=bridge_unavailable, error.details.reason=cannot connect to bridge service, confirm itasca_mcp_bridge.start() is running and your MCP client's bridge URL matches

Relationship to MCP servers

This package is the in-process runtime only. Pair it with an MCP server that speaks its WebSocket protocol — for example pfc-mcp — for full client setup.

License: MIT.