KeiSei84
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Thin skill wrapper over the existing kei-message jsonl mailbox so the user (and agents) can talk between Claude Code sessions with @id syntax: /msg read my inbox (to me or "all") /msg @frontend text send to a session (identity = its cwd basename) /msg all text broadcast /msg list | who whole bus / known recipients - kei-message.sh send now accepts a leading @name as the recipient (first token only; a later @x stays literal). --to still works. - skills/msg/SKILL.md documents the identity model (cwd-basename), pull delivery (recipient's next turn via mailbox-inject hook), and the first-contact discovery path (who / all). - README skills count 68 -> 69. Verified: @name/all/--to parsing (3 cases) + end-to-end send/inbox/who via the live script in a sandbox HOME. Skill registered + discoverable. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
62 lines
3.2 KiB
Markdown
62 lines
3.2 KiB
Markdown
---
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name: msg
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description: Read or write the cross-session mailbox by @id. Send a message to another Claude Code session (`/msg @name text`), read your own inbox (`/msg` with no args), broadcast to everyone (`/msg all text`), list the whole bus, or discover who is reachable. Thin wrapper over the `kei message` jsonl mailbox — messages land in the recipient's NEXT turn via the mailbox-inject hook (pull, not push). Use whenever the user wants sessions/agents to talk to each other.
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argument-hint: "[@name] <message> | (empty = read inbox) | list | who"
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---
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# /msg — Inter-Session Mailbox
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A persistent append-only bus so ANY Claude Code session can message ANY other —
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not just Agent-Teams teammates, no tmux, no daemon. Backed by
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`~/.claude/scripts/kei-message.sh` writing `~/.claude/mailbox/messages.jsonl`.
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The `mailbox-inject.sh` UserPromptSubmit hook pulls each session's unread into
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its context once per turn, so delivery is **pull** (arrives on the recipient's
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next turn), not instant push.
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## Identity model
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- **Your address** = the basename of this session's working directory (`$PWD`).
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So a session running in `~/Projects/frontend` is reachable as `@frontend`.
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- **`all`** is the broadcast channel — every session sees `to:"all"` messages.
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- You can override the sender with `--from <name>` and the reader identity with
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`--me <name>` if a session's cwd basename isn't the name you want to use.
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## Command map
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Interpret `$ARGUMENTS` and run the matching command via Bash, then show its
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output to the user. The launcher `kei message …` and the script path are
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equivalent — prefer the script path (always present after install):
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| User typed | Run |
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|---|---|
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| `/msg` (no args) | `~/.claude/scripts/kei-message.sh inbox` |
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| `/msg @frontend ship it` | `~/.claude/scripts/kei-message.sh send @frontend ship it` |
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| `/msg all standup in 5` | `~/.claude/scripts/kei-message.sh send all standup in 5` |
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| `/msg list` | `~/.claude/scripts/kei-message.sh list` |
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| `/msg who` (or `channels`) | `~/.claude/scripts/kei-message.sh channels` |
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Rules for parsing `$ARGUMENTS`:
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1. **Empty** → read inbox (`inbox`). Show the messages addressed to this
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session or to `all`.
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2. **Starts with `@<name>`** → send to that recipient; the rest is the body.
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A `@x` that appears later in the body stays literal text.
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3. **Starts with `all `** → broadcast; the rest is the body.
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4. **`list`** → print the recent whole bus (every from→to line).
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5. **`who` / `channels`** → print known recipient names (use this to discover
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who is reachable before sending the first message).
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6. Anything else with no leading `@`/`all` → treat as a broadcast body, OR ask
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the user who the recipient is if it's ambiguous.
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## Discovery (first-message problem)
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A recipient only appears in `who` after it has sent or been sent a message, so
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for the very first contact either broadcast with `all`, or ask the user for the
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target session's cwd-basename. Don't invent a recipient name.
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## Notes
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- Sending never blocks and never notifies the recipient out-of-band — they see
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it on their next turn. For a time-sensitive ping, tell the user it's queued.
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- This is plain files: `cat ~/.claude/mailbox/messages.jsonl` is the raw bus.
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- Bypass the inject hook for a session with `KEI_MAILBOX_BYPASS=1`.
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