"Relay" matching MCP servers:

Enables local AI agents to communicate directly over Unix sockets, allowing multi-agent collaboration across different models and harnesses without any broker or network dependency.

Lets AI agents exchange typed, schema-validated messages and coordinate asynchronously through a shared inbox, with tools to list, ask, send, and reply to other agents.

Enables separate Claude Code sessions across a team to see teammates' live presence, warn before editing a file someone else is editing, route shared-contract changes to the developers whose code depends on them, and produce structured handoffs when a session ends.

A message relay MCP server enabling two separate Claude Code instances to exchange direct questions and answers asynchronously without sharing context.

Enables local MCP clients to manage messaging workflows via stdio: list and read chats/messages, send messages, react to messages, manage typing/read state, and handle contact cards and requests.

MCP server that enables AI agents on different machines to communicate and collaborate directly through relay channels, supporting structured agent contracts, real-time messaging, and human-in-the-loop approval workflows.

Connects Claude Desktop and Claude Code, enabling autonomous exchange of messages, files, and code while keeping their context windows separate.

Enables team members' personal AI agents to exchange tasks, questions, decisions, and deliveries over MCP with identity, policy, and audit, using Slack as a shared visibility record.

Self-hosted session relay for Claude enabling shared message threads across multiple Claude surfaces like Code, Chat, and Cowork, allowing seamless state transfer without manual copy-paste.

An end-to-end encrypted inbox where AI agents deliver reports, files, and artifacts, and submit outbound email or spend requests for human approval. Content is decrypted in the browser, never on the server.

Enables real-time communication between Claude Code instances across multiple machines via WebSocket, allowing context sharing, task handoffs, and coordination between sessions.

MCP coordination primitive for multi-agent workflows. Lets multiple AI coding agents (Claude Code, Cursor, n8n, custom clients) discover each other and exchange messages and tasks via a shared SQLite-backed message bus.

Enables managing Firefox Relay masks (random and domain) via MCP tools, including listing, creating, updating, and disabling masks.

This server allows integration with Discord, enabling message exchanges between Claude and a Discord channel using prompts and notifications.

Enables AI assistants to manage Flow Relay projects, generate handoffs and insights, and interact with integrations like Discord through natural language.

Minimal Discord Gateway relay for Claude Code and any MCP client using raw WebSocket and MCP-native notifications.

Enables sending messages to Discord via webhook URLs through a single tool.

Enables sending rich markdown messages to a fixed Telegram channel via MCP.

A relay server that enables communication between Claude Code and Codex through shared messaging channels, facilitating collaborative workflows like code reviews. It includes tools for posting and fetching messages, a web UI for viewing conversations, and automated activity logging.

160 tools that do that heavy lifting - storage, agent-to-agent collaboration, document conversions, identity verification -- almost all priced under a tenth of a cent or less per call.