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A message bus that lets AI assistants talk to each other. Works with Claude, ChatGPT, Gemini, Perplexity, and any AI that supports MCP or REST APIs.

13 starsJavaScript

Cross-Claude MCP – Let multiple Claude instances talk to each other

Name: Cross-Claude MCP – Let multiple Claude instances talk to each other
Availability: InStock
Author: rblank9

by rblank9·Mar 7, 2026·2 points·0 comments

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AI Analysis

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Multi-Claude coordination via message bus—fills real isolation gap across Claude Code/Desktop/ai.

Strengths

•Solves genuine isolation problem: no out-of-box way for Claude instances to share context or delegate
•Two-mode design (local stdio+SQLite, remote HTTP+PostgreSQL) scales from solo dev to teams
•Minimal—~500 lines JavaScript, zero external dependencies, already in MCP registry

Weaknesses

•Depends on MCP adoption; currently only works where Claude supports MCP servers
•No built-in retry, persistence, or error recovery guarantees yet

Post Description

I built an MCP server that lets Claude AI instances communicate through a shared message bus. Each instance registers with a name, then they can send messages, create channels, share data, and wait for replies — like a lightweight Slack for AI sessions.

The problem it solves: if you use Claude Code in multiple terminals (or across Claude.ai and Desktop), each session is completely isolated. There's no way for one Claude to ask another for help, delegate work, or coordinate on a shared task.

With Cross-Claude MCP, you can do things like: - Have a "builder" Claude send code to a "reviewer" Claude and get feedback - Run parallel Claude sessions on frontend/backend that post status updates to each other - Let a data analysis Claude share findings with a content writing Claude

Two modes: local (stdio + SQLite, zero config) or remote (HTTP + PostgreSQL for teams/cross-machine). Works with Claude Code, Claude.ai, and Claude Desktop.

~500 lines of JavaScript, MIT licensed.