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claude-foundations/memory/skill-spawn-session.md

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# /spawn-session
## Purpose
Spawn a new, separate Claude Code session inside a detached `tmux` session with Remote
Control enabled, in a project's directory, named after the project (e.g. "Agent Runtimes",
auto-incrementing to "Agent Runtimes #2"). Lets the user start a session for another project
that persists on the host and is reachable later via `tmux attach` (over VPN) or driveable
from the Claude app.
## Usage
- `/spawn-session <project>` — spawn for a named project folder
- `/spawn-session <project> --mode <mode>` — override engagement mode
- `/spawn-session` — lists projects and asks which one
## How it works
Calls `claude-sessions spawn <folder> --headless [--name topic] [--create]` (since 2026-10-26),
which wraps `claude-tmux` (in `small-scripts`, symlinked to `~/sbin`). The skill only resolves
the folder from `$ARGUMENTS` (or asks). Headless mode never prompts or attaches, and exits 2
if the topic is already a live tmux session (the skill then asks for a unique topic). All real logic — folder resolution, mode selection
(profile `last-mode` unless `--mode`), Title-Casing, ` #N` auto-increment, tmux creation,
and launching `claude --remote-control` via `claude-profile` — lives in the script.
## Gotchas
- **Separate process, not a sub-agent.** The spawned session does not share the current
conversation's context. It's a full interactive Claude Code session the user drives.
- **Remote Control only registers once `claude` is running.** The script guarantees this by
passing the engagement mode explicitly so `claude-profile` never stalls at its interactive
picker. Don't "fix" the skill to omit the mode.
- **Default profile is `oreillyit-anthropic`.** Only override with `--profile` on request.
- **Concurrent same-profile sessions** race on the shared `active-mode.env`, but each
session's cwd takes precedence for project auto-selection, so the right project is picked.
- Spec + tests: `small-scripts/specs/claude-tmux.spec.md`, `tests/test-claude-tmux.sh`.