MCP server for Festo/CODESYS PLCs: IEC 61131-3 ST + validated PLCopen XML generation.
Connect Runs on your machine
claude mcp add festo-codesys-mcp -e FESTO_MCP_CODESYS_PATH=<FESTO_MCP_CODESYS_PATH> -e FESTO_MCP_CODESYS_PROFILE=<FESTO_MCP_CODESYS_PROFILE> -e FESTO_MCP_PYTHON=<FESTO_MCP_PYTHON> -e FESTO_MCP_ENABLE_HARDWARE=<FESTO_MCP_ENABLE_HARDWARE> -e FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE=<FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE> -- npx -y [email protected]{
"mcpServers": {
"festo-codesys-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"FESTO_MCP_CODESYS_PATH": "<FESTO_MCP_CODESYS_PATH>",
"FESTO_MCP_CODESYS_PROFILE": "<FESTO_MCP_CODESYS_PROFILE>",
"FESTO_MCP_PYTHON": "<FESTO_MCP_PYTHON>",
"FESTO_MCP_ENABLE_HARDWARE": "<FESTO_MCP_ENABLE_HARDWARE>",
"FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE": "<FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE>"
}
}
}
}{
"mcpServers": {
"festo-codesys-mcp": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"FESTO_MCP_CODESYS_PATH": "<FESTO_MCP_CODESYS_PATH>",
"FESTO_MCP_CODESYS_PROFILE": "<FESTO_MCP_CODESYS_PROFILE>",
"FESTO_MCP_PYTHON": "<FESTO_MCP_PYTHON>",
"FESTO_MCP_ENABLE_HARDWARE": "<FESTO_MCP_ENABLE_HARDWARE>",
"FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE": "<FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE>"
}
}
}
}{
"servers": {
"festo-codesys-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"FESTO_MCP_CODESYS_PATH": "<FESTO_MCP_CODESYS_PATH>",
"FESTO_MCP_CODESYS_PROFILE": "<FESTO_MCP_CODESYS_PROFILE>",
"FESTO_MCP_PYTHON": "<FESTO_MCP_PYTHON>",
"FESTO_MCP_ENABLE_HARDWARE": "<FESTO_MCP_ENABLE_HARDWARE>",
"FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE": "<FESTO_MCP_ALLOW_OUTSIDE_WORKSPACE>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
FESTO_MCP_CODESYS_PATHOptional | Optional. Absolute path to CODESYS.exe — enables the 12 ide_* tools that drive a live CODESYS V3.5 instance (Windows only). |
FESTO_MCP_CODESYS_PROFILEOptional | Required when using the ide_* tools. CODESYS profile name exactly as shown in the CODESYS version selector. |
FESTO_MCP_PYTHONOptional | Optional. Python interpreter for the XSD/semantic validators and hardware tools (needs lxml). |
FESTO_MCP_ENABLE_HARDWAREOptional | Optional. Set to 1 to enable the cpx_*/edcon_* hardware commissioning tools (bench use only). |
FESTO_MCP_ALLOW_OUTSIDE_WORKSPACEOptional | Optional. Set to 1 to allow file-writing tools to write outside the workspace directory. |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 17 Jul 2026 |
| Last updated | 17 Jul 2026 |
| Registry name | io.github.efranceschetti/festo-codesys-mcp |
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