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 who work with context management, workbaton and workstash and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-10 · ★ 2 · #112 OF 229 MAINTAINED CODING AGENT · VERIFIED 2026-09-18

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 #112 of 229 actively-maintained coding agent servers as of 2026-09-18.
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 2026-09-18, its last commit was 2026-09-10 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. ★ 29,556 · 2026-09-17
  2. Desktop Commander MCP server for terminal commands, file operations, and process management ★ 9,633 · 2026-09-17
  3. Ouroboros Pins an acceptance spec; the verify command and expected output never enter the success contract. ★ 6,016 · 2026-09-15
  4. Socraticode MCP server for enterprise local codebase indexing, semantic search, and code dependency graphs. ★ 3,312 · 2026-09-17
  5. Omnara Deploy durable AI agents with Omnara, an open-source managed-agent platform. ★ 2,858 · 2026-09-18
  6. Docs Search and read Empryo's documentation. Read-only, no auth, no local access. ★ 1,246 · 2026-09-17

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 · ★ 62,152
  2. GitLab MCP → documentation companion documentation · ★ 1,984
  3. Xcode Build MCP → developer tools companion developer tools · ★ 6,397
  4. Sentry MCP → developer tools companion developer tools · ★ 855
  5. Server Filesystem → filesystem companion filesystem · ★ 39,038
  6. Pdf MCP → filesystem companion filesystem · ★ 135

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