Bernstein (sipyourdrink-ltd) MCP Server

Deterministic orchestrator for CLI coding agents. Byte-identical replay, 40+ adapters, air-gap.

People connecting coding agent tools to Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-08-25 · ★ 981 · #5 OF 194 MAINTAINED CODING AGENT · VERIFIED 2026-08-25

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

v3.17.2 · 2026-08-24

A patch release about proof: what a run recorded, and whether you can still check it afterwards. · Receipts you can re-derive · A gate verdict is three-valued, but receipts stored only the outcome, so an auditor…

v3.17.1 · 2026-08-22

A patch release about one thing: a container run that starts from an issue number and is still alive an hour later. · Agents stopped dying · The heartbeat was refreshed by a shell loop pasted into the agent's own…

v3.17.0 · 2026-08-21

This release began as an arXiv preprint. The evaluation section kept turning into · a bug report, so we shipped the bug report first. · The task graph dropped work · A failed or cancelled task now reaches dependents…

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: coding agent - ranked #5 of 194 actively-maintained coding agent servers as of 2026-08-25.
release cadence: 10+ releases in the last 90 days (latest 2026-08-24)
registry: io.github.sipyourdrink-ltd/bernstein (active, first published 2026-07-12 · 22 versions)
packages: pypi:bernstein · oci:ghcr.io/sipyourdrink-ltd/bernstein:3.17.2

06 · Bernstein (sipyourdrink-ltd) FAQ

What is Bernstein (sipyourdrink-ltd)?

Deterministic orchestrator for CLI coding agents. Byte-identical replay, 40+ adapters, air-gap.

Is Bernstein (sipyourdrink-ltd) still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-25 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 coding agent servers if Bernstein (sipyourdrink-ltd) isn't the fit.

Pairs well with

Servers that cover what Bernstein (sipyourdrink-ltd) doesn't - only shown when the pairing reason fits the companion.

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