com.cmdrvl/twinning

@cmdrvl/twinning-mcp

Twins for Postgres and REST: declared-subset Postgres, spec-defined REST, migration proof.

117/wk GitHub npm

No known CVEs

MIT license

Actively maintained

Last commit 7d ago

Works with most clients

Transport: stdio, sse, http

0 tools

Grade F

MCPpedia last refreshed this data 19h ago

Edit this pageView history

com.cmdrvl/twinning is an MCP server that twins for Postgres and REST: declared-subset Postgres, spec-defined REST, migration proof. Its tool list has not been published yet over stdio, sse and http, requires no API key, and scores 62/100 on MCPpedia's security, maintenance and efficiency rubric.

Data

Step 1

Install in your client

Config is the same across clients - only the file and path differ.

Supported in Claude Desktopstdio, sse, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "twins": {
      "args": [
        "--workdir",
        "/absolute/path/to/project"
      ],
      "command": "/absolute/path/to/twinning-mcp"
    }
  }
}

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What com.cmdrvl/twinning does

Twins for Postgres and REST: declared-subset Postgres, spec-defined REST, migration proof.

Test This Server

This server supports HTTP transport. Be the first to test it - help the community know if it works.

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Scored, not listed

Why this score

Five weighted categories - click any category to see the underlying evidence.

Score breakdown

62/100across 5 weighted dimensions

How we score →

0255075100

−38

Security

Maintenance

Efficiency

Documentation

Compatibility

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Security

OSV.dev

No known CVEs.

Checked @cmdrvl/twinning-mcp against OSV.dev.

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Frequently Asked Questions

Is com.cmdrvl/twinning safe to use?: com.cmdrvl/twinning has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under MIT.
How do I install com.cmdrvl/twinning?: com.cmdrvl/twinning supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What AI clients work with com.cmdrvl/twinning?: com.cmdrvl/twinning is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.
Is com.cmdrvl/twinning actively maintained?: com.cmdrvl/twinning is actively maintained - last commit was 7 days ago.

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Community

Discussion

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Has anyone used this with Cursor?How do you handle auth?Any alternatives?

twinning

Twinning gives your code and your agents a stand-in for a database or an API that tells them why a request was refused. Point it at a Postgres schema or an OpenAPI spec and it serves a local twin. Your client connects with its normal driver, a write that breaks a constraint comes back with the real SQLSTATE and a reason, and a report records what happened. Use it to rehearse extraction code and pipelines before they touch a real database, to check a migration by replaying queries against old and new snapshots, and to test API clients against a spec-defined contract. Anything outside the declared contract is refused with a reason instead of guessed.

Set up with an agent

Paste this prompt into your coding agent (Claude Code, Cursor, Codex, or any agent that can run shell commands) to install the twinning MCP server on your machine. It downloads the prebuilt release, verifies its checksum, and configures your MCP client. It works on macOS and Linux. The Windows archive does not include the MCP server yet.

Set up the twinning MCP server on this machine. Work through the steps in order, run each command yourself, and tell me what you did and what you saw. Do not use sudo, and do not change any MCP server entry other than "twins". 1. Detect my OS and CPU. Supported targets are aarch64-apple-darwin, x86_64-apple-darwin, x86_64-unknown-linux-gnu and aarch64-unknown-linux-gnu. If this is Windows, stop and tell me the MCP server is not available there yet. 2. Find the latest release tag of https://github.com/cmdrvl/twinning (for example by following the redirect from https://github.com/cmdrvl/twinning/releases/latest). The archive is named twinning-<tag>-<target>.tar.gz and the checksums file is named SHA256SUMS, both under https://github.com/cmdrvl/twinning/releases/download/<tag>/. 3. Create a new, empty directory ~/.local/share/twinning/<tag> and download the archive and SHA256SUMS into it with curl -fL (not a browser). Verify the archive against its line in SHA256SUMS (shasum -a 256 -c, or sha256sum -c on Linux). If the checksum does not match, stop and tell me. Do not extract it. 4. Extract the archive into that directory. It must contain two executables, twinning and twinning-mcp. Remember their absolute paths. 5. Run "<dir>/twinning-mcp doctor". It must print "health: ok (healthy (READY))". If macOS refuses to run the binaries, run "xattr -d com.apple.quarantine <dir>/twinning <dir>/twinning-mcp" and retry. 6. Ask me which project directory twins should work in (default: the current directory) and which MCP client I use. Then configure it: - Claude Desktop: "<dir>/twinning-mcp --workdir <project> setup --client claude-desktop" - Cursor: "<dir>/twinning-mcp --workdir <project> setup --client cursor" - Claude Code: "claude mcp add twins -- <dir>/twinning-mcp --workdir <project>" - Anything else: run "<dir>/twinning-mcp --workdir <project> setup --client claude-desktop --print" and add that "twins" entry to my client's MCP configuration by hand. Tell me if I need to restart or reload the client. 7. Check it works without the client: write a file schema.sql in the project directory containing CREATE TABLE deals (deal_id TEXT PRIMARY KEY, deal_name TEXT NOT NULL); then start the server with "<dir>/twinning-mcp --workdir <project>" and, over MCP stdio, call twin_doctor, then twin_start with kind "postgres" and schema_path "schema.sql", then twin_stop with the returned twin_id. Report the result of each call. Stop the server when done. If any step fails, stop and show me the exact command and its full output.

Twinning is built by CMD+RVL. If you work with filings or structured finance data and want a sourced answer, you can chat with Cairn, our research assistant, over text at textcairn.com.

Frequently Asked Questions

Is com.cmdrvl/twinning safe to use?

com.cmdrvl/twinning has no known CVEs as of the latest MCPpedia security scan. Authentication requirements were not detected automatically - check the project's documentation before connecting in a shared environment. Licensed under MIT.

How do I install com.cmdrvl/twinning?

com.cmdrvl/twinning supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

What AI clients work with com.cmdrvl/twinning?

com.cmdrvl/twinning is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse and http transport.

Is com.cmdrvl/twinning actively maintained?

com.cmdrvl/twinning is actively maintained - last commit was 7 days ago.

twinning

Set up with an agent

Twinning is built by CMD+RVL. If you work with filings or structured finance data and want a sourced answer, you can chat with Cairn, our research assistant, over text at textcairn.com.

com.cmdrvl/twinning

Install in your client