--- name: collaborative-emacs-41918ed464b2 description: Claude Code runs an Emacs daemon, starts a CRDT server, shares buffers. --- # Collaborative Emacs — Claude Code + CRDT Live Editing **Trit**: 0 (ERGODIC - bidirectional coordination) **Status**: Working **Date**: 2026-02-10 **Prerequisite**: crdt.el (elpa), emacsclient ## What This Does Claude Code runs an Emacs daemon, starts a CRDT server, shares buffers. User's Emacs auto-connects and sees live edits. No interactive prompts. ## Quick Start (Human Side) 1. **Install crdt.el** ```elisp ;; Via GNU ELPA (use-package crdt) ``` 2. **Host a session** (on your machine) ``` M-x crdt-share-buffer ;; share current buffer ;; or M-x crdt-new-session ;; start a session, then share buffers into it ``` Prompts for port (default 6530). Binds `0.0.0.0` so Tailscale peers can connect. 3. **Connect from another machine** ``` M-x crdt-connect ;; URL: ein://your-machine.tail1234.ts.net:6530 ;; or: ein://100.x.y.z:6530 ``` ## Architecture (Preferred) ``` ┌──────────────┐ emacsclient -s ┌──────────────────┐ │ Claude Code │ ──────────────────▶ │ Emacs daemon │ │ (this CLI) │ │ "claude-crdt" │ └──────────────┘ │ CRDT SERVER │ │ port 6531 │ └────────┬─────────┘ │ auto-connect (crdt-autoconnect.el) │ ▼ ┌──────────────────┐ │ User's Emacs │ │ (CRDT client) │ └──────────────────┘ ``` ## Setup ### Auto-connect file (already installed) `~/.emacs.d/crdt-autoconnect.el`: ```elisp (require 'crdt) (require 'url-parse) (run-at-time 3 nil (lambda () (condition-case err (let ((url (url-generic-parse-url "ein://localhost:6531"))) (crdt-connect url "alice") (message "Connected to Claude CRDT on port 6531")) (error (message "CRDT connect failed: %S" err))))) ``` ## Usage ### Step 1: Claude starts daemon with CRDT server ```bash emacs -nw --daemon=claude-crdt emacsclient -s claude-crdt -e ' (progn (require (quote crdt)) (let ((buf (get-buffer-create "*claude-workspace*"))) (with-current-buffer buf (org-mode) (insert "#+TITLE: Workspace\n")) (crdt-new-session 6531 nil "" "claude" (quote (crdt-default-session-permissions))) (crdt--share-buffer buf (car crdt--session-list) "workspace.org")))' ``` ### Step 2: Claude shares files ```bash emacsclient -s claude-crdt -e ' (let* ((s (car crdt--session-list)) (buf (find-file-noselect "/path/to/file.org"))) (crdt--share-buffer buf s "file.org"))' ``` ### Step 3: User launches Emacs and auto-connects Local: ```bash emacs -nw -l ~/.emacs.d/crdt-autoconnect.el ``` Over Tailscale (from any node on the tailnet): ```bash CRDT_HOST=2-monad CRDT_PORT=6531 emacs -nw -l ~/.emacs.d/crdt-autoconnect.el ``` Or by Tailscale IP: ```bash CRDT_HOST=100.87.209.11 emacs -nw -l ~/.emacs.d/crdt-autoconnect.el ``` 3 seconds after startup, connects automatically. No minibuffer prompts. Then: `M-x crdt-switch-to-buffer` ### Tailscale Notes The daemon's `crdt-new-session` binds to `0.0.0.0` — accessible on all interfaces including Tailscale. No extra config needed. #### crdt.el URL Format (confirmed from upstream docs) | Protocol | URL | Use | |----------|-----|-----| | Unencrypted | `ein://host:port` | Default | | TLS (stunnel) | `eins://host:port` | Encrypted | Full Tailscale URLs for `M-x crdt-connect`: ``` ein://2-monad.pirate-dragon.ts.net:6531 # FQDN ein://2-monad:6531 # MagicDNS short ein://100.87.209.11:6531 # by IP ``` Programmatic connection (no prompts): ```elisp (crdt-connect (url-generic-parse-url "ein://2-monad.pirate-dragon.ts.net:6531") "alice") ``` `crdt-copy-url` on the server side also generates these `ein://` URLs. Online tailnet nodes: - `2-monad` (100.87.209.11) — this machine - `causality` (100.69.33.107) - `hatchery` (100.72.249.116) ### Step 4: Claude reads shared buffers ```bash emacsclient -s claude-crdt -e ' (let* ((s (car crdt--session-list)) (buf (gethash "BUFFER-NAME" (crdt--session-buffer-table s)))) (with-current-buffer buf (buffer-substring-no-properties (point-min) (point-max))))' ``` ### Step 5: Claude writes to shared buffers ```bash emacsclient -s claude-crdt -e ' (let* ((s (car crdt--session-list)) (buf (gethash "BUFFER-NAME" (crdt--session-buffer-table s)))) (with-current-buffer buf (goto-char (point-max)) (insert "\n* New heading from Claude\n")))' ``` ## Key Patterns ### Read buffer content ```elisp (let* ((s (car crdt--session-list)) (buf (gethash "BUFFER" (crdt--session-buffer-table s)))) (with-current-buffer buf (buffer-substring-no-properties (point-min) (point-max)))) ``` ### Insert at point-max ```elisp (with-current-buffer buf (goto-char (point-max)) (insert "text")) ``` ### Insert at specific position ```elisp (with-current-buffer buf (goto-char (point-min)) (search-forward "* Target Heading") (end-of-line) (insert "\nNew content under heading")) ``` ### Run org commands on shared buffer ```elisp (with-current-buffer buf (org-sort-entries nil ?a)) ; sort alphabetically ``` ### Check who's connected ```bash emacsclient -s claude-crdt -e ' (let ((s (car crdt--session-list))) (hash-table-keys (crdt--session-user-table s)))' ``` ## Critical Lessons - `crdt-share-buffer` and `crdt-connect` use interactive settings buffers — NEVER call them from emacsclient, they block forever - Use `crdt-new-session` (programmatic) to create server sessions - Use `crdt--share-buffer` (internal) to add buffers without prompts - Use `crdt-autoconnect.el` with `url-generic-parse-url` for the user's side — fully non-interactive, delayed 3s after init - Claude daemon hosts the server (port 6531), user is the client - `emacs --batch` can't maintain CRDT connections (exits immediately) - Always use `--daemon=claude-crdt` for persistent connection ## Cleanup ```bash # Kill the daemon when done emacsclient -s claude-crdt -e '(kill-emacs)' ``` ## Related Skills - `crdt-vterm` — terminal sharing via CRDT + vterm - `emacs` — base Emacs ecosystem skill - `elisp` — Emacs Lisp reference - `emacs-info` — Info navigation --- Source attribution: plurigrid Original project: https://github.com/plurigrid/asi/blob/293ce9f76e3abcd5ba18db284688bc0d9ac6691d/skills/collaborative-emacs/SKILL.md License: MIT License information: https://opensource.org/license/mit Original upstream instructions; downloaded from Mega AI Hub. ## Upstream license notice MIT License Copyright (c) 2025 SkillCreator.ai Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # Mega AI Hub resource metadata Creator / publisher: plurigrid Original project: https://github.com/plurigrid/asi/blob/293ce9f76e3abcd5ba18db284688bc0d9ac6691d/skills/collaborative-emacs/SKILL.md Attribution basis: Source repository record Fields of work: Content & Media, Development & Engineering, Product Management Roles: Backend Developer, DevOps / SRE, Frontend Developer, Product Manager, Technical Writer Specialties: Backend, Frontend Tools: Crdt, Emacs Country applicability: Country not specified Classification basis: Source catalog labels Instruction SHA-256: aaa3eb8a58891c55c8968234e9b35e624b10be11693cd227541daf0c9ec0ddc6