psm

name	psm
description	Project Session Manager — isolated dev environments with git worktrees and tmux
argument-hint	review <ref> | fix <ref> | feature <name> | list | attach <session> | kill <session> | cleanup | status
aliases	["session","worktree-session"]
disable-model-invocation	true

Project Session Manager (/psm)

Manage isolated development sessions with git worktrees and tmux. All PSM state lives under ~/.maestro-psm/.

User Command

$ARGUMENTS

Supported Subcommands

Pattern	Action
review <ref>	Create PR review session
fix <ref>	Create issue-fix session
feature <name>	Create feature session from main
list	List sessions from state + tmux
attach <session>	Show attach command for a session
kill <session>	Kill tmux + remove worktree + delete state
cleanup	Auto-clean merged PR / closed issue sessions
status	Show current session context

---

Initialization (Always Run First)

STATE_DIR="$HOME/.maestro-psm"
WORKTREE_ROOT="$STATE_DIR/worktrees"
LOG_DIR="$STATE_DIR/logs"
SESSIONS_FILE="$STATE_DIR/sessions.json"

mkdir -p "$WORKTREE_ROOT" "$LOG_DIR"

if [[ ! -f "$SESSIONS_FILE" ]]; then
  cat > "$SESSIONS_FILE" <<'EOF'
{"version": 1, "sessions": {}}
EOF
fi

Rules:

• Use $HOME (expanded ~) for filesystem operations.
• Create parent directories before writing files or creating worktrees.
• Fail fast with clear error messages when prerequisites are missing.

---

Shared Parsing Rules

GitHub Reference Formats

Support these forms for review and fix:

• #123 → current repo
• owner/repo#123 → explicit repo
• https://github.com/owner/repo/pull/123 → PR URL
• https://github.com/owner/repo/issues/123 → issue URL

Parse Outcomes

Normalize parsed data into:

• repo: owner/repo
• number: numeric ref (123)
• kind: pull or issue

Validation

• review <ref> accepts PR formats only (#, owner/repo#, or /pull/).
• fix <ref> accepts issue formats only (#, owner/repo#, or /issues/).
• If #123 is used, resolve repo from current directory with gh repo view --json nameWithOwner.
• If parsing fails, stop and show accepted examples.

---

Shared Session Model

Use this consistent session metadata model in ~/.maestro-psm/sessions.json:

{
  "version": 1,
  "sessions": {
    "project:pr-123": {
      "id": "project:pr-123",
      "type": "review",
      "repo": "owner/repo",
      "number": 123,
      "ref": "#123",
      "title": "Add webhook support",
      "branch": "pr-123-review",
      "base": "main",
      "worktree": "/Users/me/.maestro-psm/worktrees/project/pr-123",
      "tmux": "maestro:project:pr-123",
      "createdAt": "2026-02-09T00:00:00Z",
      "url": "https://github.com/owner/repo/pull/123"
    }
  }
}

Session naming:

• Session ID: <alias>:<ref-id>
• Tmux session: maestro:<session-id>
• Alias default: repo name (from owner/repo)

---

Subcommand Workflows

1) review <ref>

Goal: Create a PR review workspace from the PR head branch.

1. Parse <ref> into repo + pr_number.
2. Fetch PR metadata:

   gh pr view <num> --repo <repo> --json number,title,headRefName,baseRefName,url
   

3. Resolve local repo root:
   • Prefer current git repo when remotes match <repo>.
   • Otherwise use a dedicated local clone under ~/.maestro-psm/repos/<owner>__<repo>.
4. Create/update review branch + worktree:

   git -C <repo_root> fetch origin pull/<num>/head:pr-<num>-review
   git -C <repo_root> worktree add <worktree_path> pr-<num>-review
   

   where worktree_path=~/.maestro-psm/worktrees/<alias>/pr-<num>.
5. Create tmux session in background:

   tmux new-session -d -s maestro:<alias>:pr-<num> -c <worktree_path>
   

6. Update ~/.maestro-psm/sessions.json with session metadata.
7. Print Session Ready report including attach command.

---

2) fix <ref>

Goal: Create issue-fix branch from main, plus isolated worktree + tmux.

1. Parse <ref> into repo + issue_number.
2. Fetch issue metadata via gh issue view.
3. Create branch from main:

   git -C <repo_root> fetch origin main
   git -C <repo_root> worktree add -b fix/<num>-<slug> <worktree_path> origin/main
   

   where worktree_path=~/.maestro-psm/worktrees/<alias>/issue-<num>.
4. Create tmux session:

   tmux new-session -d -s maestro:<alias>:issue-<num> -c <worktree_path>
   

5. Update sessions.json.
6. Print Session Ready report with attach command.

---

3) feature <name>

Goal: Create feature branch from main in an isolated session.

1. Resolve current repo (gh repo view --json nameWithOwner).
2. Slugify <name> for branch-safe naming.
3. Create branch + worktree:

   git -C <repo_root> fetch origin main
   git -C <repo_root> worktree add -b feature/<slug> <worktree_path> origin/main
   

   where worktree_path=~/.maestro-psm/worktrees/<alias>/feat-<slug>.
4. Create tmux session:

   tmux new-session -d -s maestro:<alias>:feat-<slug> -c <worktree_path>
   

5. Update sessions.json.
6. Print Session Ready report with attach command.

---

4) list

Goal: Show persisted sessions and whether tmux is alive.

1. Read ~/.maestro-psm/sessions.json.
2. Get live tmux sessions:

   tmux list-sessions -F "#{session_name}" 2>/dev/null
   

3. Cross-reference each session’s tmux value.
4. Display table:
   • Session ID
   • Type
   • Ref
   • Branch
   • Status (active if tmux exists, otherwise dead)

---

5) attach <session>

Goal: Provide exact attach command.

1. Build tmux name: maestro:<session>.
2. Verify session exists:

   tmux has-session -t maestro:<session>
   

3. If found, print:

   tmux attach -t maestro:<session>
   

4. If missing, show clear error and suggest /psm list.

---

6) kill <session>

Goal: Fully remove one session.

1. Resolve session record from sessions.json.
2. Kill tmux session:

   tmux kill-session -t maestro:<session>
   

3. Remove worktree:

   git -C <repo_root> worktree remove <worktree_path> --force
   

4. Delete session from sessions.json.
5. Report removed tmux/worktree/state entries.

---

7) cleanup

Goal: Auto-clean completed review/fix sessions.

For each session in sessions.json:

• If type=review, check merge status:

  gh pr view <num> --repo <repo> --json merged
  

  If merged, remove session (same steps as kill).

• If type=fix, check close status:

  gh issue view <num> --repo <repo> --json closed
  

  If closed, remove session (same steps as kill).

• If type=feature, skip automatic cleanup unless explicitly requested.

Output summary:

• Cleaned sessions
• Skipped sessions
• Any failures with reason

---

8) status

Goal: Show session context for current environment.

Detection order:

1. If inside tmux, read current session name (tmux display-message -p '#S').
2. Else match current working directory against stored worktree paths in sessions.json.
3. If a match is found, print full session details:
   • ID
   • Type
   • Repo/Ref
   • Branch
   • Worktree
   • Tmux name
   • Attach command
4. If no match, report: "Not currently in a managed PSM session."

---

Session Report Format

Use this exact structure when creating a session:

Session Ready!

  ID:       project:pr-123
  Type:     review
  PR:       #123 - Add webhook support
  Worktree: ~/.maestro-psm/worktrees/project/pr-123
  Tmux:     maestro:project:pr-123

Commands:
  Attach:  tmux attach -t maestro:project:pr-123
  Kill:    /psm kill project:pr-123
  Cleanup: /psm cleanup

For issue/fix or feature sessions, replace the PR line with the relevant reference label.

---

Important Notes

• Use gh CLI for all GitHub operations (auth + repo context).
• Use ~/.maestro-psm/ for all state (never ~/.psm/, never .maestro/).
• Expand ~ to $HOME in real command execution.
• Create parent directories before filesystem operations.
• Tmux sessions launch in background; user remains in current terminal.
• Always tell the user how to attach (tmux attach -t maestro:<session>).
• Use clear, actionable error messages (invalid ref, missing gh auth, missing tmux session, git worktree errors).