A2 CR MCP Server

A2CR is an open-source local MCP workspace for AI agent handoffs. It lets Codex, Claude Code, Cursor, and other MCP-capable agents save WorkBaton checkpoints, store temporary WorkStash notes, coordinate through WorkThreads, and resume long coding work from a fresh AI window.

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

VERIFIED ACTIVE

LAST COMMIT 2026-08-20 · ★ 2 · #82 OF 194 MAINTAINED CODING AGENT · VERIFIED 2026-08-25

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

01 · Install A2 CR

before you install - you'll need

A2CR_LOCAL_DB is optional or environment-specific per the README.

Claude Code

claude mcp add a2cr-a2cr -- uvx a2cr-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "a2cr-a2cr": {
      "command": "uvx",
      "args": [
        "a2cr-mcp"
      ]
    }
  }
}

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

license Apache-2.0 - declared in the repository

pypi package a2cr-mcp - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.a2cr is GitHub-verified and matches the repo owner

03 · What A2 CR can do

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

Latest releases

v0.1.8 · 2026-07-01

# A2CR 0.1.8 Metadata Refresh · This release refreshes public package metadata after the Apache-2.0 local-only transition. · It exists because the immutable 0.1.7 PyPI metadata still included older BUSL, Roo Code…

v0.1.7 · 2026-06-25

This release moves the public A2CR distribution to a local-only workspace model. · Highlights: · No A2CR account, API key, hosted URL, SaaS dashboard, or cloud sync is required for normal public setup. · a2cr…

v0.1.6 · 2026-05-19

0.1.6 - Causal Handoff Guidance · Adds repository-local A2CR.md guidance for WorkBaton, WorkStash, causal handoff summaries, and scope boundaries. · Updates MCP tool guidance so agents can store concise causal handoff…

04 · Who maintains A2 CR

A2CR is maintained by a2cr. It's the only MCP server we track from this author; the repo dates to May 2026.

05 · Facts

repository
github.com/a2cr/a2cr
category
coding agent - ranked #82 of 194 actively-maintained coding agent servers as of 2026-08-25.
release cadence
2 releases in the last 90 days (latest 2026-07-01)
registry
io.github.a2cr/a2cr-mcp (active, first published 2026-05-14 · 4 versions)
packages
pypi:a2cr-mcp

06 · A2 CR FAQ

What is A2 CR?

A2CR is an open-source local MCP workspace for AI agent handoffs. It lets Codex, Claude Code, Cursor, and other MCP-capable agents save WorkBaton checkpoints, store temporary WorkStash notes, coordinate through WorkThreads, and resume long coding work from a fresh AI window.

Is A2 CR still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-20 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install A2 CR?

Run `uvx a2cr-mcp`. The README documents one environment variable (A2CR_LOCAL_DB) to set first. A2CR_LOCAL_DB is optional or environment-specific per the README. You can also paste the ready-made client config above.

Does A2 CR 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 A2 CR

Alternatives to A2 CR

Maintained coding agent servers if A2 CR isn't the fit.

  1. Serena A powerful toolkit for coding, providing semantic retrieval and editing capabilities. ★ 28,461 · 2026-08-20
  2. Desktop Commander MCP server for terminal commands, file operations, and process management ★ 9,387 · 2026-08-21
  3. Ouroboros Pins an acceptance spec; the verify command and expected output never enter the success contract. ★ 5,649 · 2026-08-25
  4. Socraticode MCP server for local codebase indexing, semantic search, and code dependency graphs. ★ 3,274 · 2026-08-24
  5. Magic Cloud Self-hosted low-code platform (Docker); its MCP endpoint runs on your own instance, not via npx. ★ 1,180 · 2026-08-24
  6. LLM Sandbox Securely run LLM-generated code in isolated containers across 7 languages and 3 container backends. ★ 1,111 · 2026-08-23

Pairs well with

Servers that cover what A2 CR doesn't - only shown when the pairing reason fits the companion.

  1. Context7 → documentation companion documentation · ★ 61,171
  2. GitLab MCP → documentation companion documentation · ★ 1,918
  3. Storybook MCP Addon → developer tools companion developer tools · ★ 268
  4. Xcode Build MCP → developer tools companion developer tools · ★ 6,274
  5. Server Filesystem → filesystem companion filesystem · ★ 38,704
  6. X402 List MCP → filesystem companion filesystem · ★ 58

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