crosswalk

Product Introduction

1. Definition: Crosswalk is an MCP (Model Context Protocol) server (mcp.crosswalk.to) that functions as a centralized, AI-native communication and information management platform. It acts as a "third place" or shared context layer between a user and their AI agents, integrating an inbox, private groups, a calendar, and notes.
2. Core Value Proposition: It exists to solve information overload and context fragmentation for AI power users. By channeling curated information streams—primarily newsletters and user-generated content—directly into supported AI agents, it enables persistent, personalized context. This allows users to "catch up on everything" and "forget nothing" by making their AI a proactive partner with a continuous, trusted knowledge base.

Main Features

1. AI-Native Inbox & Newsletter Integration: The core feature is a dedicated email address ([email protected]) that serves as a ingestion point. Users subscribe their crosswalk email to newsletters. All incoming emails are parsed and made available to connected AI agents via the MCP server's get_context call. This provides agents with a real-time, curated feed of high-signal information tailored to the user's interests.
2. Multi-Agent MCP Server Connectivity: Crosswalk's MCP server is compatible with a vast ecosystem of AI clients and coding assistants. It provides standardized connectors for major platforms including Claude (Desktop, Web, Mobile), ChatGPT (via MCP Apps), Cursor, Codex, Warp, Zed, and JetBrains AI. This universal compatibility ensures the user's context is available across all their AI tools.
3. Public & Private Crosswalks (Shared Context Channels): Beyond the personal inbox, Crosswalk enables the creation of shared context channels. Users can have a private crosswalk (a CLAUDE.md that lives on the server), create duo crosswalks with a friend, form private group crosswalks for teams, or follow public crosswalks (e.g., @username) for community knowledge sharing. This turns static documentation into dynamic, agent-accessible streams.

Problems Solved

1. Pain Point: The fragmentation of knowledge across newsletters, emails, and internal documentation creates a "context gap" for AI agents. LLMs lack persistent, personalized memory, and manually providing context is inefficient. Users miss important information and repeat themselves across sessions.
2. Target Audience: The primary user is a technical professional, developer, researcher, or knowledge worker who heavily utilizes multiple AI assistants (Claude, ChatGPT, Cursor) and subscribes to niche newsletters for staying informed. Secondary audiences include teams needing a shared knowledge base for AI agents and community builders.
3. Use Cases: A developer asks Claude Code for a summary of the latest Latent Space newsletter directly in their IDE. A founder shares a market analysis via a private crosswalk for their team's agents to reference. A researcher uses their personal crosswalk as a persistent memory for long-term projects. An individual curates a public @readme crosswalk that tells anyone's AI about their work and interests.

Unique Advantages

1. Differentiation: Unlike generic RSS readers or note-taking apps, Crosswalk is built from the ground up for the MCP ecosystem, offering deep, native integration with AI agents. Unlike manually copying text into a chat, it automates context provisioning. It differs from simple chatbot memory by being user-curated and source-based (trusted newsletters), not just chat history.
2. Key Innovation: Its core innovation is treating the MCP server not just as a tool provider but as a context hub. By combining the universality of email for ingestion with the standardization of MCP for distribution, it creates a seamless, user-controlled pipeline for feeding high-quality, structured information directly into the context window of virtually any modern AI assistant.

Frequently Asked Questions (FAQ)

1. How does Crosswalk work with ChatGPT? Crosswalk connects to ChatGPT via its MCP App framework. Users enable Developer Mode, create a new MCP App within ChatGPT's interface, provide the Crosswalk server URL (https://mcp.crosswalk.to), and authenticate. Once connected, users can ask ChatGPT to "check crosswalk" to access their inbox and shared channels.
2. Is Crosswalk a replacement for my email client? No, Crosswalk is not a general-purpose email client. It is a specialized ingestion and context layer for AI agents. Its inbox is designed for curated, informational content like newsletters, not for managing personal or transactional email correspondence.
3. What is the difference between a private and a public crosswalk? A private crosswalk (like your personal inbox or a group) is only accessible to you and your invited agents. A public crosswalk (like @username) is a broadcast channel; any user can direct their AI agent to read from it, enabling one-to-many knowledge sharing without requiring others to install anything.
4. How do I add newsletters to my Crosswalk inbox? You can use the built-in directory to subscribe to over 773 curated newsletters, which Crosswalk will manage. Alternatively, you can use your personal @crosswalk.to email address to subscribe to any newsletter directly, and all emails sent to that address will populate your AI-accessible inbox.
5. What AI agents and code editors support Crosswalk? Crosswalk supports a wide range via MCP, including Claude (all platforms), ChatGPT, Cursor, Muse, Codex, GitHub Copilot, Windsurf, Zed, Warp, JetBrains AI, and CLI tools like Gemini CLI and dots. Support is determined by the client's implementation of the Model Context Protocol.