Bernstein (sipyourdrink-ltd) MCP Server

The open-source governance layer for AI agents. Byte-identical run receipts, 40+ adapters, air-gap.

People who work with agent orchestrator, deterministic replay and air gap and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-18 · ★ 1,190 · #3 OF 945 MAINTAINED OTHER · VERIFIED 2026-09-18

Apache-2.0 · Python servers · how we verify → /methodology

01 · Install Bernstein (sipyourdrink-ltd)

before you install - you'll need

BERNSTEIN_AUDIT

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add sipyourdrink-ltd-bernstein -- uvx bernstein

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "sipyourdrink-ltd-bernstein": {
      "command": "uvx",
      "args": [
        "bernstein"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · container (OCI image) - can be sandboxed away from your filesystem

license Apache-2.0 - declared in the repository

pypi package bernstein - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.sipyourdrink-ltd is GitHub-verified and matches the repo owner

03 · What Bernstein (sipyourdrink-ltd) can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v3.19.2 · 2026-09-10

Two hundred and twenty-nine changes since v3.19.1, and one of them is why this · page arrives ahead of the usual cadence. · bernstein audit verify could print its green panel while the grant sweep it · had just run was…

v3.19.1 · 2026-09-03

94 changes since v3.19.0. This is the release where the name caught up with · the product. · Bernstein began as a scheduler for coding agents. Along the way it started · keeping receipts: for every approval, every key…

v3.19.0 · 2026-08-31

For most of its life the project called itself an orchestrator for CLI coding · agents. That was the demo, not the product. What it actually ships - an audit · chain, signed lineage, byte-identical replay, compliance…

04 · Who maintains Bernstein (sipyourdrink-ltd)

bernstein is maintained by sipyourdrink-ltd. It's the only MCP server we track from this author; the repo dates to Mar 2026.

05 · Facts

repository: github.com/sipyourdrink-ltd/bernstein
website: https://bernstein.run/
category: other - ranked #3 of 945 actively-maintained other servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-09-10)
registry: io.github.sipyourdrink-ltd/bernstein (active, first published 2026-07-12 · 23 versions)
packages: pypi:bernstein · oci:ghcr.io/sipyourdrink-ltd/bernstein:3.19.2

06 · Bernstein (sipyourdrink-ltd) FAQ

What is Bernstein (sipyourdrink-ltd)?

The open-source governance layer for AI agents. Byte-identical run receipts, 40+ adapters, air-gap.

Is Bernstein (sipyourdrink-ltd) still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-18 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Bernstein (sipyourdrink-ltd)?

Run `uvx bernstein`. The README documents one environment variable (BERNSTEIN_AUDIT) to set first. You can also paste the ready-made client config above.

Does Bernstein (sipyourdrink-ltd) run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Bernstein (sipyourdrink-ltd)

Alternatives to Bernstein (sipyourdrink-ltd)

Maintained other servers if Bernstein (sipyourdrink-ltd) isn't the fit.

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