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MCP server for 1C infobases via COM

1C MCP Server

A Windows Python MCP server that connects to file and server 1C infobases via COMConnector and stores connection profiles with DPAPI-protected passwords

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MCP server

Extended access

Why this level

  • Restricted write tools change data in the connected 1C infobase behind an explicit confirmation
  • Stores the 1C user's login and password in local connection profiles
All reasons and checks
Russian stack

antoha-ndd/onec-mcp-serverAuthor:antoha-ndd

Install

Manual install

python -m venv .venv && .venv\Scripts\Activate.ps1 && pip install -e .

Installs on Windows in a virtual environment.

Access and checks

How we review

Extended accessThe tool runs code or makes network calls and only reads external data.

  • Restricted write tools change data in the connected 1C infobase behind an explicit confirmation
  • Stores the 1C user's login and password in local connection profiles

This is third-party code. Review the repository files before installing.

What it does

The server connects to a 1C infobase passed in each tool call, via COMConnector on Windows, detecting the installed platform version from the registry itself and choosing the right V85 or V83 connector with a fallback on failure. It supports read-only queries, metadata lookup, object reads, lightweight analytics, and restricted write tools gated by an explicit confirmation flag and environment-based allowlists. Connection profiles with address, login and password can be saved; on Windows, passwords are stored via DPAPI when pywin32 is available, and the profile list never returns saved passwords. The server can write a detailed rotating diagnostics log with passwords masked.

Who it is for. For 1C developers on Windows who need an MCP server with explicit control over write operations and safe storage of connection passwords.

Good fit when

  • You need agent access to a file or server 1C infobase specifically via COM on Windows
  • Writes to the infobase must require explicit confirmation and be restricted by an allowlist
  • You need to store several connection profiles without keeping passwords in plain text

Not a fit when

  • You are not on Windows: the server uses COMConnector and has no alternative for Linux or macOS
  • No 1C platform with a registered COM connector is installed

Example request

Connect to the test 1C infobase using the saved demo-file-base profile and show the Counterparties catalog structure

MCP

Transport
stdio
Authentication
not required

Environment variables

ONEC_MCP_LOG_LEVEL
Diagnostics log level, for example DEBUG.
ONEC_MCP_LOG_PATH
Path to the rotating diagnostics log file.

Limitations

Works only on Windows with an installed 1C platform and a registered COMConnector for version 8.5 or 8.3. Without pywin32, profile passwords are not DPAPI-protected. The project is small, has no listed license, no releases and no stars.

How to disable. Remove the onec-mcp-server entry from your MCP client config and, if needed, the connection-profiles.json file with saved profiles.

FAQ

Does the server return saved passwords?

No, the list_connection_profiles tool never returns passwords, only profile metadata.

How are writes to the infobase restricted?

Write tools require an explicit confirmation flag and are limited by an allowlist set through environment variables.

Discussion

No questions or reviews yet.

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README in short

The English README describes a Python MCP server built on COMConnector for file and server 1C infobases. It covers platform and connector requirements, installing via venv and pip install -e ., running with the onec-mcp-server command over stdio, configuring the diagnostics log through environment variables, and the structure of a saved connection profile with the infobase address.

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