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Bernstein

by sipyourdrink-ltd · sipyourdrink-ltd/bernstein

Deterministic orchestrator across 40+ CLI agents — auditable, reproducible runs that don't depend on a single model.

Bernstein gives you a deterministic execution model on top of CLI agents (Claude Code, Codex, Gemini CLI, Aider, etc.). Same prompt + same inputs = same audited trail. Useful for compliance and CI use.

Why use it

Key features

Live Demo

What it looks like in practice

ready

Install

Pick your client

~/Library/Application Support/Claude/claude_desktop_config.json  · Windows: %APPDATA%\Claude\claude_desktop_config.json
{
  "mcpServers": {
    "bernstein-skill": {
      "command": "git",
      "args": [
        "clone",
        "https://github.com/sipyourdrink-ltd/bernstein"
      ],
      "_inferred": true
    }
  }
}

Open Claude Desktop → Settings → Developer → Edit Config. Restart after saving.

~/.cursor/mcp.json · .cursor/mcp.json
{
  "mcpServers": {
    "bernstein-skill": {
      "command": "git",
      "args": [
        "clone",
        "https://github.com/sipyourdrink-ltd/bernstein"
      ],
      "_inferred": true
    }
  }
}

Cursor uses the same mcpServers schema as Claude Desktop. Project config wins over global.

VS Code → Cline → MCP Servers → Edit
{
  "mcpServers": {
    "bernstein-skill": {
      "command": "git",
      "args": [
        "clone",
        "https://github.com/sipyourdrink-ltd/bernstein"
      ],
      "_inferred": true
    }
  }
}

Click the MCP Servers icon in the Cline sidebar, then "Edit Configuration".

~/.codeium/windsurf/mcp_config.json
{
  "mcpServers": {
    "bernstein-skill": {
      "command": "git",
      "args": [
        "clone",
        "https://github.com/sipyourdrink-ltd/bernstein"
      ],
      "_inferred": true
    }
  }
}

Same shape as Claude Desktop. Restart Windsurf to pick up changes.

~/.continue/config.json
{
  "mcpServers": [
    {
      "name": "bernstein-skill",
      "command": "git",
      "args": [
        "clone",
        "https://github.com/sipyourdrink-ltd/bernstein"
      ]
    }
  ]
}

Continue uses an array of server objects rather than a map.

~/.config/zed/settings.json
{
  "context_servers": {
    "bernstein-skill": {
      "command": {
        "path": "git",
        "args": [
          "clone",
          "https://github.com/sipyourdrink-ltd/bernstein"
        ]
      }
    }
  }
}

Add to context_servers. Zed hot-reloads on save.

claude mcp add bernstein-skill -- git clone https://github.com/sipyourdrink-ltd/bernstein

One-liner. Verify with claude mcp list. Remove with claude mcp remove.

Use Cases

Real-world ways to use Bernstein

Run agents with an audit trail

👤 Claude Code users ⏱ ~15 min intermediate

When to use: Compliance asks for a record of what was sent, by whom, with what result.

Flow
  1. Configure
    Pick backends + log sinks.✓ Copied
    → Audit on
  2. Run
    bernstein run job.yml.✓ Copied
    → Trace captured
  3. Replay
    bernstein replay <run-id>.✓ Copied
    → Re-execution

Outcome: Reproducible runs with full traceability.

Combinations

Pair with other MCPs for X10 leverage

bernstein-skill + claude-code-safety-net

Audit + guardrails together

Combine bernstein-skill with claude-code-safety-net: Audit + guardrails together✓ Copied

Tools

What this MCP exposes

ToolInputsWhen to callCost
run / replay / export (see docs) Three flows 1 call

Cost & Limits

What this costs to run

API quota
N/A
Tokens per call
Per-backend
Monetary
Free OSS
Tip
Pin model versions in runs — replay only works with same model

Security

Permissions, secrets, blast radius

Credential storage: Audit log on disk
Data egress: Per-backend
Never grant: rotate audit log without retention policy

Troubleshooting

Common errors and fixes

Non-determinism

Set seed / temperature where the backend supports it

Alternatives

Bernstein vs others

AlternativeWhen to use it insteadTradeoff
Single-agent CLIYou don't need auditNo reproducibility

More

Resources

📖 Read the official README on GitHub

🐙 Browse open issues

🔍 Browse all 400+ MCP servers and Skills