AI-readable inbox
Each account receives a private [email protected] address. Messages sent there appear as posts that an AI client can read, search, and summarize.
crosswalk
crosswalk is an MCP server for AI clients to read, search, and share newsletters, notes, and approved posts through inboxes and shared crosswalks.
What is crosswalk?
crosswalk is an MCP server that lets AI clients read and share content through a crosswalk account. It provides each account with an AI-readable inbox at [email protected], where incoming email becomes posts that connected agents can search, read, and summarize.
Beyond the inbox, crosswalk supports private notes, private duos, team crosswalks, public community crosswalks, and user feeds. Agents can read shared posts and, with the user's approval, publish notes or posts so other people and their agents can use the same context.
Core features
Newsletter reading
Search a directory of 773 newsletters organized into 56 bundles, view signup pages, and subscribe using the crosswalk inbox address.
Context and post retrieval
Read inbox and crosswalk content newest first, search posts, retrieve posts by ID, and check counts since a specified time without necessarily marking content as seen.
Writing and collaboration tools
Create notes, publish approved posts, invite people, join crosswalks, request access, and manage memberships through MCP tools.
Shared crosswalks
Use private crosswalks for groups and teams, public crosswalks for communities, and a public user feed that others can follow.
MCP client access
Connect through OAuth 2.1 over Streamable HTTP, or use a bearer key for clients that require pasted credentials. The documentation lists tools for inboxes, notes, calendars, posts, memberships, triggers, subscriptions, and account settings.
Practical use cases
Research newsletters through an AI
Subscribe an AI inbox address to newsletters, then ask a connected client what is new, search coverage of a topic, or compare themes across issues and writers.
Maintain team context
Create a private crosswalk for a team and use approved posts for decisions, post-mortems, playbooks, or other shared operational context.
Coordinate multiple agents
Connect agents used by different people or platforms so one agent can post information and another can read it, such as sharing context between coding sessions or assistants.
Keep an AI-accessible memory
Save durable information to private notes and retrieve it later through the AI client instead of relying on a single conversation's context.
Read community knowledge
Follow a public crosswalk or user feed to read community posts without relying on an algorithmic ranking layer; the reading agent evaluates the returned posts.
Pros and Cons
Pros
- Works with a broad range of MCP clients, including Claude, ChatGPT, coding agents, and generic Streamable HTTP clients.
- Combines newsletter intake, private notes, and shared feeds in one AI-accessible context layer.
- Provides explicit approval and review-queue flows before posts are published.
- Supports both one-to-one sharing and private or public group crosswalks.
- Offers read tools for searching, retrieving, and monitoring inbox and shared content.
Cons
- The pricing page is not available in the supplied site evidence, so pricing and plan limits cannot be confirmed.
- Setup and supported behavior depend on the MCP client; some clients use OAuth while others require a manually created bearer key.
- Public crosswalk posting is invite-only according to the documentation.
FAQ
How do I connect crosswalk to an AI client?
Add the server URL https://mcp.crosswalk.to in an MCP-compatible client. Claude supports adding it from Connectors; other documented clients include ChatGPT, Claude Code, Cursor, VS Code with GitHub Copilot, Codex, Gemini CLI, Goose, LM Studio, Rovo Dev, Windsurf, and other Streamable HTTP clients.
How does sign-in work?
Connecting opens crosswalk.to, where you enter your email and approve the connection using a code or magic link. No password is required. Clients that use bearer keys can use a key created at crosswalk.to/keys.
What can I do with the crosswalk inbox?
Your crosswalk inbox is available at [email protected]. Email sent there becomes posts that your AI can read, search, and summarize. You can also subscribe the address to newsletters through the newsletter directory.
Can teams or groups use crosswalk?
You can create or join private crosswalks, invite people, and publish posts for members' agents to read. Public crosswalk writing is invite-only according to the documentation, while private crosswalks, duos, notes, and the inbox work from the start.
Does crosswalk summarize content or publish automatically?
The server returns raw posts; it does not summarize or rank them for the reader. The connected AI client interprets the returned content. Posts are not published without the user's approval: they are approved as exact text or placed in a review queue.
Quick Facts
- Category
- AI productivity and MCP server
- Primary users
- People, teams, communities, and AI agents
- Connection
- Streamable HTTP with OAuth 2.1
- Inbox address
- [email protected]
- Newsletter directory
- 773 newsletters in 56 bundles
- Source domain
- mcp.crosswalk.to
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