zskills-dashboard

name	zskills-dashboard
disable-model-invocation	true
argument-hint	[start|stop|status|restart]
description	Local web dashboard — plans, issues, worktrees, branches, tracking activity, drag-and-drop priority queue. Starts a detached Python HTTP server on a port from DEV_PORT / dev_server.default_port / port.sh; stop sends SIGTERM; restart = stop+start (for code reloads). State at .zskills/monitor-state.json.
metadata	{"version":"2026.06.05+3ced02"}

/zskills-dashboard — Local Dashboard

/zskills-dashboard exposes the Phase 5 Python dashboard server as a first-class skill. It launches the server detached (so it survives the parent shell), records the live PID/port in .zskills/dashboard-server.pid, and provides start/stop/status modes.

The server itself is skills/zskills-dashboard/scripts/zskills_monitor/ (stdlib-only Python, localhost-bound, atomic-write state). This skill body wraps it: port resolution, PID-file handling, process-identity checks (command name AND cwd), tracking markers for state-changing modes, and a SIGTERM-only stop path on POSIX (CLAUDE.md rule — never escalate to SIGKILL). On Windows (Git-Bash / MSYS), where Python runs no SIGTERM handler, stop instead requests a graceful taskkill //PID, then escalates to a TARGETED taskkill //PID //F of the single verified PID (never a port/name mass-kill) — see the stop section.

Arguments

/zskills-dashboard start    # launch detached server, write PID file
/zskills-dashboard stop     # SIGTERM the server, remove PID file
/zskills-dashboard status   # report PID, port, uptime, log path
/zskills-dashboard restart  # stop then start (pick up Python changes)

status is the default when $ARGUMENTS is empty.

Parsing rule. Treat $ARGUMENTS as a single token (lowercased, trimmed). Anything that is not start, stop, status, restart, or empty is a usage error:

Usage: /zskills-dashboard [start|stop|status|restart]

Exit 2.

Worktree override — ZSKILLS_DASHBOARD_ROOT

By default the dashboard anchors to the main checkout so all sessions share one canonical view. When an agent in a worktree needs to verify its own frontend changes visually, set the ZSKILLS_DASHBOARD_ROOT environment variable to the worktree path before invoking /zskills-dashboard start:

ZSKILLS_DASHBOARD_ROOT=/tmp/zskills-do-foo /zskills-dashboard start

This overrides MAIN_ROOT in the SKILL.md setup block and passes --main-root to the Python server so that both the collector (collect.py:_resolve_main_root) and the static-file serving use the worktree's filesystem instead of main's.

When the variable is unset or empty, behavior is unchanged — the dashboard serves from the main checkout as before.

The Python server also accepts --main-root DIR directly on the CLI (used by tests); the env var is the agent-facing surface.

Step 0 — Common setup (every mode)

Anchor MAIN_ROOT to the main checkout by default. If ZSKILLS_DASHBOARD_ROOT is set to an existing directory, use that instead — this is the worktree-override path documented above. The PID file, log file, and tracking markers all live under $MAIN_ROOT/.zskills/.

if [ -n "${ZSKILLS_DASHBOARD_ROOT:-}" ] && [ -d "$ZSKILLS_DASHBOARD_ROOT" ]; then
  MAIN_ROOT=$(cd "$ZSKILLS_DASHBOARD_ROOT" && pwd)
elif [ -n "${CLAUDE_PROJECT_DIR:-}" ] && [ -d "$CLAUDE_PROJECT_DIR" ]; then
  MAIN_ROOT=$(cd "$CLAUDE_PROJECT_DIR" && pwd)
else
  MAIN_ROOT=$(cd "$(git rev-parse --git-common-dir)/.." && pwd)
fi
PID_FILE="$MAIN_ROOT/.zskills/dashboard-server.pid"
LOG_FILE="$MAIN_ROOT/.zskills/dashboard-server.log"
if [ -n "${CLAUDE_PLUGIN_ROOT:-}" ] && [ -d "${CLAUDE_PLUGIN_ROOT}/skills/zskills-dashboard/scripts" ]; then
  PKG_PARENT="${CLAUDE_PLUGIN_ROOT}/skills/zskills-dashboard/scripts"
else
  PKG_PARENT="$MAIN_ROOT/skills/zskills-dashboard/scripts"
fi
# Dual-lane resolution: plugin install (${CLAUDE_PLUGIN_ROOT}) first, then
# .claude/skills/... mirror (legacy /update-zskills install lane), then
# source-tree fallback (zskills repo + tests).
if [ -x "${CLAUDE_PLUGIN_ROOT}/skills/update-zskills/scripts/port.sh" ]; then
  PORT_SCRIPT="${CLAUDE_PLUGIN_ROOT}/skills/update-zskills/scripts/port.sh"
else
  PORT_SCRIPT="$MAIN_ROOT/.claude/skills/update-zskills/scripts/port.sh"
  [ -x "$PORT_SCRIPT" ] || PORT_SCRIPT="$MAIN_ROOT/skills/update-zskills/scripts/port.sh"
fi
if [ -x "${CLAUDE_PLUGIN_ROOT}/skills/create-worktree/scripts/sanitize-pipeline-id.sh" ]; then
  SANITIZE_SCRIPT="${CLAUDE_PLUGIN_ROOT}/skills/create-worktree/scripts/sanitize-pipeline-id.sh"
else
  SANITIZE_SCRIPT="$MAIN_ROOT/.claude/skills/create-worktree/scripts/sanitize-pipeline-id.sh"
  [ -x "$SANITIZE_SCRIPT" ] || SANITIZE_SCRIPT="$MAIN_ROOT/skills/create-worktree/scripts/sanitize-pipeline-id.sh"
fi

# Server's own scripts dir is in-skill — no install/source split.
mkdir -p "$MAIN_ROOT/.zskills"

# Platform detector (#1093/#1096 stop-path mirror). The PID file holds the
# server's *Windows* PID (os.getpid), so on Git-Bash/MSYS the POSIX
# kill/lsof//proc primitives — which key on MSYS PIDs — target the wrong
# thing. ZSK_WIN gates each POSIX-only operation; the POSIX branch stays
# byte-for-byte unchanged on Linux/macOS (ZSK_WIN=0).
case "$(uname -s)" in
  MINGW*|MSYS*|CYGWIN*) ZSK_WIN=1 ;;
  *)                    ZSK_WIN=0 ;;
esac

# port_has_listener PORT — returns 0 if some process is LISTENing on PORT,
# 1 otherwise. Shared by the start pre-flight and the stop release-verify so
# both sites branch on the same platform logic.
#   POSIX:   lsof -iTCP:PORT -sTCP:LISTEN (unchanged from the pre-Windows path)
#   Windows: lsof is ABSENT; netstat IS present. `netstat -ano` lists every
#            socket with state; a LISTENING row for :PORT means in-use.
port_has_listener() {
  local _port="$1"
  if [ "$ZSK_WIN" -eq 1 ]; then
    netstat -ano 2>/dev/null | grep -E ":$_port[[:space:]]" | grep -qi LISTENING
  else
    lsof -iTCP:"$_port" -sTCP:LISTEN >/dev/null 2>&1
  fi
}

Process-identity check (shared by start and stop)

Whenever a PID is read from the PID file, verify TWO things before trusting it:

1. Command-name match. ps -p $PID -o command= output must match python[0-9.]*.*zskills_monitor.server (python or python3 — the launch uses "$PYTHON", which may resolve to either, #1083).
2. Cwd match. The process's cwd must equal $MAIN_ROOT. On Linux read /proc/$PID/cwd; on macOS or Linux without /proc, fall back to lsof -p $PID -d cwd -Fn and parse the n<path> line. If both methods fail (permission denied or tool missing), skip the cwd check and log a warning to stderr — fall through on command-name match alone.

If EITHER check fails (command-name mismatch OR cwd-mismatch when verifiable), the PID is stale, PID-reused, or belongs to a different worktree's dashboard — do NOT kill it. Treat the PID file as stale.

Windows (Git-Bash / MSYS) degraded identity (#1093/#1096 stop-path). Windows has neither /proc nor lsof, and ps's command column does not carry the python … zskills_monitor.server argv reliably — so the POSIX two-checks cannot run. On Windows (ZSK_WIN=1) the helper degrades to three Windows-tool checks, ALL of which must pass:

1. Alive — tasklist //FI "PID eq $PID" lists the PID (liveness).
2. Owns our port — netstat -ano shows the PID as the LISTENING owner of our port (the ZSK_IDENTITY_PORT global the caller sets).
3. Image is python — tasklist shows the PID's image as python*.exe. The cwd-identity check is belt-and-suspenders and is simply unavailable on Windows; "owns our port + is python + alive" is the strongest identity the platform affords before a targeted kill. Identity is verified BEFORE any taskkill, exactly as the POSIX path verifies before kill.

# Returns 0 if PID is alive AND identity matches; 1 otherwise.
# Stdout is the matched command name (for diagnostics on mismatch).
verify_monitor_identity() {
  local pid="$1"
  local cmd cwd_proc cwd_lsof matched_cwd

  # Windows (Git-Bash / MSYS) degraded identity (#1093/#1096). No /proc, no
  # lsof, and the MSYS `kill -0` keys on MSYS PIDs while the PID file holds
  # the server's Windows PID — so the POSIX path below cannot run here.
  # Three Windows-tool checks, ALL required: alive (tasklist), owns our port
  # (netstat LISTENING owner == PID on ZSK_IDENTITY_PORT), image is python
  # (tasklist image == python*.exe). cwd-identity is unavailable on Windows.
  if [ "${ZSK_WIN:-0}" -eq 1 ]; then
    local tl_line
    # tasklist row for this PID (//NH = no header). 2>/dev/null because a
    # dead PID yields "INFO: No tasks…" on stderr — the expected branch.
    tl_line=$(tasklist //FI "PID eq $pid" //NH 2>/dev/null)
    # Alive: the PID must appear as a whole word in the row.
    if ! printf '%s' "$tl_line" | grep -q "\b$pid\b"; then
      return 1
    fi
    # Image is python*.exe (the server is launched via "$PYTHON").
    if ! printf '%s' "$tl_line" | grep -qiE '(^|[[:space:]])python[0-9.]*\.exe'; then
      printf 'identity-mismatch: image=%s\n' "$(printf '%s' "$tl_line" | awk '{print $1}')" >&2
      return 1
    fi
    # Owns our port: netstat must show the PID as the LISTENING owner of
    # ZSK_IDENTITY_PORT (the last column of a netstat -ano row is the PID).
    if [ -n "${ZSK_IDENTITY_PORT:-}" ]; then
      if ! netstat -ano 2>/dev/null | grep -E ":$ZSK_IDENTITY_PORT[[:space:]]" \
           | grep -i LISTENING | grep -qw "$pid"; then
        printf 'identity-mismatch: PID %s is not the LISTENING owner of port %s\n' "$pid" "$ZSK_IDENTITY_PORT" >&2
        return 1
      fi
    fi
    printf 'python (windows, pid %s, port %s)\n' "$pid" "${ZSK_IDENTITY_PORT:-?}"
    return 0
  fi

  # Liveness — kill -0 with a 2>/dev/null because failure here is the
  # expected branch (dead PID).
  if ! kill -0 "$pid" 2>/dev/null; then
    return 1
  fi

  cmd=$(ps -p "$pid" -o command= || echo "")
  # Match python OR python3 (the launch uses "$PYTHON", which may resolve to
  # either an absolute /…/python or /…/python3 path — #1083).
  if [[ ! "$cmd" =~ python[0-9.]*.*zskills_monitor\.server ]]; then
    printf 'identity-mismatch: command=%s\n' "$cmd" >&2
    return 1
  fi

  # cwd verification — Linux /proc first, lsof fallback. Both
  # operations may fail (tool missing, permissions) — that branch is
  # expected, so 2>/dev/null is allowed here per CLAUDE.md rule
  # exception ("where the failure is the expected branch").
  cwd_proc=$(readlink "/proc/$pid/cwd" 2>/dev/null || echo "")
  if [ -n "$cwd_proc" ]; then
    matched_cwd="$cwd_proc"
  else
    cwd_lsof=$(lsof -p "$pid" -d cwd -Fn 2>/dev/null | awk '/^n/ {sub(/^n/,""); print; exit}')
    if [ -n "$cwd_lsof" ]; then
      matched_cwd="$cwd_lsof"
    else
      # Neither method worked — log and accept command-name match alone.
      printf 'identity-warning: cwd unverifiable for PID %s (no /proc, no lsof output); accepting command-name match\n' "$pid" >&2
      printf '%s\n' "$cmd"
      return 0
    fi
  fi

  if [ "$matched_cwd" != "$MAIN_ROOT" ]; then
    printf 'identity-mismatch: cwd=%s expected=%s\n' "$matched_cwd" "$MAIN_ROOT" >&2
    return 1
  fi

  printf '%s\n' "$cmd"
  return 0
}

Tracking marker helper (state-changing modes only)

start and stop write a fulfilled.zskills-dashboard.<id> marker under .zskills/tracking/zskills-dashboard.<id>/. status is read-only and writes nothing (per Phase 8 spec — avoids flooding tracking with one subdir per status check).

if [ -f "${CLAUDE_PLUGIN_ROOT}/skills/update-zskills/scripts/zskills-resolve-config.sh" ]; then
  export CLAUDE_PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT}"
  . "${CLAUDE_PLUGIN_ROOT}/skills/update-zskills/scripts/zskills-resolve-config.sh"
else
  . "$CLAUDE_PROJECT_DIR/.claude/skills/update-zskills/scripts/zskills-resolve-config.sh"
fi
write_tracking_marker() {
  local mode="$1" pid_val="${2:-}" port_val="${3:-}"
  local raw="zskills-dashboard-$(date -u +%Y%m%dT%H%M%SZ)"
  local id
  id=$(bash "$SANITIZE_SCRIPT" "$raw")
  local subdir="$MAIN_ROOT/.zskills/tracking/zskills-dashboard.$id"
  mkdir -p "$subdir"
  local marker="$subdir/fulfilled.zskills-dashboard.$id"
  {
    printf 'skill: zskills-dashboard\n'
    printf 'id: %s\n' "$id"
    printf 'mode: %s\n' "$mode"
    [ -n "$pid_val" ] && printf 'pid: %s\n' "$pid_val"
    [ -n "$port_val" ] && printf 'port: %s\n' "$port_val"
    printf 'status: complete\n'
    printf 'date: %s\n' "$(TZ="${TIMEZONE:-UTC}" date -Iseconds)"
  } > "$marker"
  echo "ZSKILLS_PIPELINE_ID=zskills-dashboard.$id"
}

Mode dispatch

SUB="${ARGUMENTS:-status}"
SUB=$(printf '%s' "$SUB" | tr -d '[:space:]' | tr '[:upper:]' '[:lower:]')
[ -z "$SUB" ] && SUB="status"

case "$SUB" in
  start)   ;;
  stop)    ;;
  status)  ;;
  restart) ;;
  *)
    echo "Usage: /zskills-dashboard [start|stop|status|restart]" >&2
    exit 2
    ;;
esac

start — launch detached server

Run start as a single Bash invocation. Resolving $PYTHON, the pre-flight check, and the detached launch share one shell — execute the steps below inline as one command; do NOT compile them into a helper script (e.g. .zskills/dashboard-run.sh).

1. Inspect existing PID file. If present, parse pid and port via BASH_REMATCH, run liveness + identity check. On match, announce "already running" and exit 0. On mismatch, warn and remove the stale PID file before continuing.

2. Resolve the port. Invoke the canonical port.sh (Phase 5's resolution chain — DEV_PORT env > dev_server.default_port > stub callout > built-in mapping).

3. Pre-flight. If something is already listening on the port, print the friendly busy diagnostic and exit 2.

4. Launch detached. nohup "$PYTHON" -m zskills_monitor.server under cd "$MAIN_ROOT" with PYTHONPATH pointing at $MAIN_ROOT/skills/zskills-dashboard/scripts so the package is on sys.path (per DA-5). Redirect stdout+stderr to .zskills/dashboard-server.log; close stdin to prevent terminal read-block; disown so the process is detached from the parent shell job table.

5. Verify. Sleep briefly, then curl -sf http://127.0.0.1:$PORT/api/health and require "status":"ok". On success, print the URL and exit 0; on failure, print the last 20 lines of the log and exit 1 (do NOT SIGTERM — there may be nothing running).

if [ "$SUB" = "start" ]; then
  # Resolve $PYTHON (Windows MS-Store-stub guard, #1083) for the launch below.
  if [ -f "${CLAUDE_PLUGIN_ROOT}/skills/update-zskills/scripts/zskills-resolve-config.sh" ]; then
    export CLAUDE_PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT}"
    . "${CLAUDE_PLUGIN_ROOT}/skills/update-zskills/scripts/zskills-resolve-config.sh"
  else
    . "$CLAUDE_PROJECT_DIR/.claude/skills/update-zskills/scripts/zskills-resolve-config.sh"
  fi
  [ -n "$PYTHON" ] || { echo "ERROR: zskills requires Python 3 — install it or set ZSKILLS_PYTHON" >&2; exit 1; }
  EXISTING_PID=""
  EXISTING_PORT=""
  if [ -f "$PID_FILE" ]; then
    PID_BODY=$(cat "$PID_FILE")
    if [[ "$PID_BODY" =~ (^|$'\n')pid=([0-9]+) ]]; then
      EXISTING_PID="${BASH_REMATCH[2]}"
    fi
    if [[ "$PID_BODY" =~ (^|$'\n')port=([0-9]+) ]]; then
      EXISTING_PORT="${BASH_REMATCH[2]}"
    fi

    if [ -n "$EXISTING_PID" ]; then
      # Thread the PID file's port to the identity helper for the Windows
      # degraded "owns our port" check (no-op on POSIX, which uses /proc/lsof).
      ZSK_IDENTITY_PORT="${EXISTING_PORT:-}"
      if verify_monitor_identity "$EXISTING_PID" >/dev/null; then
        echo "already running at http://127.0.0.1:${EXISTING_PORT:-?}/ (pid $EXISTING_PID)"
        write_tracking_marker "start-already-running" "$EXISTING_PID" "${EXISTING_PORT:-}"
        exit 0
      else
        echo "WARN: stale PID file at $PID_FILE (pid $EXISTING_PID does not match zskills_monitor); removing." >&2
        rm -- "$PID_FILE"
      fi
    else
      echo "WARN: PID file $PID_FILE has no parseable pid= line; removing." >&2
      rm -- "$PID_FILE"
    fi
  fi

  # Resolve port via canonical port.sh.
  if [ ! -x "$PORT_SCRIPT" ]; then
    echo "ERROR: port resolver not found at $PORT_SCRIPT" >&2
    exit 1
  fi
  PORT=$(bash "$PORT_SCRIPT")
  if [[ ! "$PORT" =~ ^[0-9]+$ ]]; then
    echo "ERROR: port.sh returned non-numeric value: $PORT" >&2
    exit 1
  fi

  # Pre-flight: refuse if another holder owns the port. port_has_listener
  # branches POSIX (lsof) vs Windows (netstat) internally; the holder
  # diagnostic is lsof-only (POSIX), netstat-derived on Windows.
  if port_has_listener "$PORT"; then
    if [ "$ZSK_WIN" -eq 1 ]; then
      HOLDER=$(netstat -ano 2>/dev/null | grep -E ":$PORT[[:space:]]" | grep -i LISTENING | tr '\n' ' ')
    else
      HOLDER=$(lsof -iTCP:"$PORT" -sTCP:LISTEN -Fpcn 2>/dev/null | head -20 | tr '\n' ' ')
    fi
    echo "ERROR: port $PORT is already in use (holder: $HOLDER). Stop the holder manually or set DEV_PORT to a free port; do NOT use SIGKILL." >&2
    exit 2
  fi

  # Launch detached. cd into MAIN_ROOT so the server's resolve_main_root
  # cwd-walk lands here. PYTHONPATH prepend keeps the package importable
  # without an install. nohup + disown survives parent-shell exit.
  # Note: PYTHONPATH resolves at runtime to either
  # PYTHONPATH=${CLAUDE_PLUGIN_ROOT}/skills/zskills-dashboard/scripts (plugin lane)
  # or PYTHONPATH=$MAIN_ROOT/skills/zskills-dashboard/scripts (source/legacy) —
  # see PKG_PARENT dual-lane resolution above (per DA-5). The path-list
  # separator is interpreter-derived (os.pathsep), NOT a hardcoded ':' —
  # native Windows Python reports ';' even under Git Bash, so a hardcoded
  # ':' (plus the trailing-empty colon from "$PKG_PARENT:${PYTHONPATH:-}")
  # would yield one invalid entry and a ModuleNotFoundError: zskills_monitor.
  DASH_PYSEP=$("$PYTHON" -c 'import os,sys; sys.stdout.write(os.pathsep)')
  if [ -n "${PYTHONPATH:-}" ]; then
    DASH_PYTHONPATH="$PKG_PARENT$DASH_PYSEP$PYTHONPATH"
  else
    DASH_PYTHONPATH="$PKG_PARENT"
  fi
  # When ZSKILLS_DASHBOARD_ROOT is set, pass --main-root so the server's
  # collector reads state from the override path (worktree verification).
  MAIN_ROOT_FLAG=""
  if [ -n "${ZSKILLS_DASHBOARD_ROOT:-}" ]; then
    MAIN_ROOT_FLAG="--main-root $MAIN_ROOT"
  fi
  # Pass --port "$PORT" explicitly so the server binds the SAME port the
  # health-check below probes. Without it the server self-resolves and can
  # land on a different port (e.g. fallback 8080) than $PORT from port.sh,
  # making a healthy server look broken. Export CLAUDE_PLUGIN_ROOT so the
  # server's shipped-helper resolution (briefing.py, port.sh) can find the
  # plugin lane on a mirror-less plugin install.
  ( cd "$MAIN_ROOT" && \
    PYTHONPATH="$DASH_PYTHONPATH" \
    CLAUDE_PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT:-}" \
    ZSKILLS_DASHBOARD_ROOT="${ZSKILLS_DASHBOARD_ROOT:-}" \
    nohup "$PYTHON" -m zskills_monitor.server --port "$PORT" $MAIN_ROOT_FLAG \
      > "$LOG_FILE" 2>&1 < /dev/null & disown )

  # Health-check loop — up to ~10s for bind + first response. Python
  # interpreter startup + module imports take 1-2s on common Linux,
  # longer under containers / slow CI; we don't want a healthy server
  # to look "broken" because the parent shell polled too eagerly.
  HEALTHY=0
  HEALTH_BODY=""
  for _ in $(seq 1 40); do
    sleep 0.25
    HEALTH_BODY=$(curl -sf -m 1 "http://127.0.0.1:$PORT/api/health" || true)
    # Server emits JSON with `"status": "ok"` (note the space after the
    # colon — Python's json.dumps default). Tolerate either spacing in
    # the assertion.
    if printf '%s' "$HEALTH_BODY" | grep -qE '"status":[[:space:]]*"ok"'; then
      HEALTHY=1
      break
    fi
  done

  if [ "$HEALTHY" -ne 1 ]; then
    echo "ERROR: server did not respond on http://127.0.0.1:$PORT/api/health within 10s." >&2
    echo "Last 20 lines of $LOG_FILE:" >&2
    tail -n 20 "$LOG_FILE" >&2 || true
    exit 1
  fi

  # Verify PID file landed (server writes it after bind). Read pid for
  # the tracking marker.
  if [ ! -f "$PID_FILE" ]; then
    echo "ERROR: server is healthy but PID file was not written at $PID_FILE." >&2
    exit 1
  fi
  PIDFILE_BODY=$(cat "$PID_FILE")
  NEW_PID=""
  if [[ "$PIDFILE_BODY" =~ (^|$'\n')pid=([0-9]+) ]]; then
    NEW_PID="${BASH_REMATCH[2]}"
  fi

  echo "Dashboard running at http://127.0.0.1:$PORT/  (pid ${NEW_PID:-?}, log $LOG_FILE)"
  write_tracking_marker "start" "$NEW_PID" "$PORT"
  exit 0
fi

stop — SIGTERM and clean up

1. No PID file → "No running dashboard (no PID file)." Exit 0 (idempotent).

2. Parse pid and port. If the PID is not alive, the file is stale — remove it and exit 0.

3. Process-identity check (command name AND cwd on POSIX; degraded alive + owns-our-port + is-python on Windows, per F-11 and #1093/#1096). If it fails, print the mismatch diagnostic and refuse to kill — exit 1 without touching the unrelated process.

4. POSIX: kill -TERM $PID. Poll kill -0 $PID every 200ms for up to 5s. Windows: the PID file holds the server's Windows PID and Python on Windows runs no SIGTERM handler, so a graceful close is requested via taskkill //PID $PID FIRST (no //F), polling liveness via tasklist for up to 5s.

5. POSIX: if still alive after 5s, refuse to escalate to SIGKILL (CLAUDE.md rule) — print a manual-recovery message and exit 1. Windows: if still alive after the bounded wait, escalate to taskkill //PID $PID //F — a targeted force-terminate of the SINGLE verified PID (identity already confirmed above), NOT a port/name mass-kill. The skill removes the PID file itself afterward, since the force-terminate runs no Python cleanup handler.

6. Verify the port is free (lsof on POSIX, netstat on Windows, via port_has_listener). Remove the PID file. Exit 0.

if [ "$SUB" = "stop" ]; then
  if [ ! -f "$PID_FILE" ]; then
    echo "No running dashboard (no PID file)."
    write_tracking_marker "stop-no-pidfile"
    exit 0
  fi

  PID_BODY=$(cat "$PID_FILE")
  STOP_PID=""
  STOP_PORT=""
  if [[ "$PID_BODY" =~ (^|$'\n')pid=([0-9]+) ]]; then
    STOP_PID="${BASH_REMATCH[2]}"
  fi
  if [[ "$PID_BODY" =~ (^|$'\n')port=([0-9]+) ]]; then
    STOP_PORT="${BASH_REMATCH[2]}"
  fi

  if [ -z "$STOP_PID" ]; then
    echo "ERROR: PID file at $PID_FILE has no parseable pid= line; remove it manually." >&2
    exit 1
  fi

  # Liveness — POSIX `kill -0` keys on MSYS PIDs and the PID file holds the
  # server's *Windows* PID, so on Windows liveness goes through tasklist.
  # In both branches failure here is the expected (dead-PID) path. The POSIX
  # branch is byte-for-byte the original `kill -0` stale-check.
  if [ "$ZSK_WIN" -eq 1 ]; then
    if ! tasklist //FI "PID eq $STOP_PID" //NH 2>/dev/null | grep -q "\b$STOP_PID\b"; then
      echo "Dashboard PID file is stale (PID $STOP_PID is not running). Removing $PID_FILE."
      rm -- "$PID_FILE"
      write_tracking_marker "stop-stale-pidfile" "$STOP_PID" "${STOP_PORT:-}"
      exit 0
    fi
  else
    # kill -0 — failure is the expected branch (dead PID), so 2>/dev/null
    # is allowed here per CLAUDE.md rule.
    if ! kill -0 "$STOP_PID" 2>/dev/null; then
      echo "Dashboard PID file is stale (PID $STOP_PID is not running). Removing $PID_FILE."
      rm -- "$PID_FILE"
      write_tracking_marker "stop-stale-pidfile" "$STOP_PID" "${STOP_PORT:-}"
      exit 0
    fi
  fi

  # Identity check — refuse to kill on mismatch. Thread the PID file's port
  # to the helper for the Windows degraded "owns our port" check (no-op on
  # POSIX, which uses command-name + /proc/lsof cwd).
  ZSK_IDENTITY_PORT="${STOP_PORT:-}"
  IDENTITY_CMD=""
  if ! IDENTITY_CMD=$(verify_monitor_identity "$STOP_PID"); then
    # Re-read for diagnostics. POSIX uses ps/proc/lsof (absent on Windows);
    # Windows uses tasklist + netstat.
    if [ "$ZSK_WIN" -eq 1 ]; then
      DIAG_CMD=$(tasklist //FI "PID eq $STOP_PID" //NH 2>/dev/null | awk '{print $1}' || echo "<gone>")
      DIAG_CWD="<unavailable-on-windows>"
    else
      DIAG_CMD=$(ps -p "$STOP_PID" -o command= || echo "<gone>")
      DIAG_CWD=$(readlink "/proc/$STOP_PID/cwd" 2>/dev/null \
        || lsof -p "$STOP_PID" -d cwd -Fn 2>/dev/null | awk '/^n/ {sub(/^n/,""); print; exit}' \
        || echo "<unknown>")
    fi
    echo "PID $STOP_PID does not appear to be zskills-dashboard for this repo (matched: $DIAG_CMD; cwd: $DIAG_CWD). Refusing to kill. Remove the PID file manually if stale." >&2
    exit 1
  fi

  if [ "$ZSK_WIN" -eq 1 ]; then
    # Windows: Python runs no SIGTERM handler, so request a graceful close
    # via `taskkill //PID` FIRST (no //F). This is a TARGETED kill of the
    # SINGLE verified PID from the PID file — identity confirmed above — NOT
    # a port/name mass-kill, so it is consistent with the "never escalate to
    # a process-mass-kill tool" rule (that rule targets mass-kills).
    taskkill //PID "$STOP_PID" >/dev/null 2>&1 || true
    EXITED=0
    for _ in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25; do
      if ! tasklist //FI "PID eq $STOP_PID" //NH 2>/dev/null | grep -q "\b$STOP_PID\b"; then
        EXITED=1
        break
      fi
      sleep 0.2
    done
    if [ "$EXITED" -ne 1 ]; then
      # Bounded graceful wait elapsed — escalate to a TARGETED force-terminate
      # of the SINGLE verified PID (//F). Still NOT a mass-kill. The skill
      # removes the PID file itself below since //F runs no Python cleanup.
      taskkill //PID "$STOP_PID" //F >/dev/null 2>&1 || true
      for _ in 1 2 3 4 5 6 7 8 9 10; do
        if ! tasklist //FI "PID eq $STOP_PID" //NH 2>/dev/null | grep -q "\b$STOP_PID\b"; then
          EXITED=1
          break
        fi
        sleep 0.2
      done
      if [ "$EXITED" -ne 1 ]; then
        echo "Dashboard did not exit after taskkill //F for PID $STOP_PID (port $STOP_PORT). Investigate manually." >&2
        exit 1
      fi
    fi
  else
    # SIGTERM only — never escalate to SIGKILL or use process-mass-kill tools.
    if ! kill -TERM "$STOP_PID"; then
      echo "ERROR: kill -TERM $STOP_PID failed." >&2
      exit 1
    fi

    # Poll for exit (up to ~5s, 200ms granularity).
    EXITED=0
    for _ in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25; do
      if ! kill -0 "$STOP_PID" 2>/dev/null; then
        EXITED=1
        break
      fi
      sleep 0.2
    done

    if [ "$EXITED" -ne 1 ]; then
      echo "Dashboard did not exit within 5s. Run 'lsof -i :$STOP_PORT' and stop manually; do NOT escalate to SIGKILL." >&2
      exit 1
    fi
  fi

  # Verify port released. A still-present listener after exit is suspicious.
  # port_has_listener branches lsof (POSIX) vs netstat (Windows) internally.
  if [ -n "$STOP_PORT" ]; then
    if port_has_listener "$STOP_PORT"; then
      echo "WARN: PID $STOP_PID is gone but port $STOP_PORT still has a listener. Investigate before next start." >&2
    fi
  fi

  # Remove PID file (server's own SIGTERM handler already removes it,
  # but belt-and-suspenders for cases where the file outlived the process).
  if [ -f "$PID_FILE" ]; then
    rm -- "$PID_FILE"
  fi

  echo "Dashboard stopped (pid $STOP_PID, port ${STOP_PORT:-?})."
  write_tracking_marker "stop" "$STOP_PID" "${STOP_PORT:-}"
  exit 0
fi

status — read-only health report

1. No PID file → "Dashboard not running." Exit 0.

2. Parse pid, port, started_at via BASH_REMATCH. If started_at does not match ^[0-9T:+-]+$, treat the PID file as malformed: print a recovery diagnostic and exit 1 (per DA-8).

3. kill -0 $PID. If the process is dead, the PID file is stale — print a recovery message and exit 1 (do NOT auto-clean; status is read-only).

4. Compute uptime from started_at (ISO-8601) using date -d arithmetic; print URL, PID, uptime, log path. Exit 0.

if [ "$SUB" = "status" ]; then
  if [ ! -f "$PID_FILE" ]; then
    echo "Dashboard not running."
    exit 0
  fi

  PID_BODY=$(cat "$PID_FILE")
  ST_PID=""
  ST_PORT=""
  ST_STARTED=""
  if [[ "$PID_BODY" =~ (^|$'\n')pid=([0-9]+) ]]; then
    ST_PID="${BASH_REMATCH[2]}"
  fi
  if [[ "$PID_BODY" =~ (^|$'\n')port=([0-9]+) ]]; then
    ST_PORT="${BASH_REMATCH[2]}"
  fi
  if [[ "$PID_BODY" =~ (^|$'\n')started_at=([^[:space:]]+) ]]; then
    ST_STARTED="${BASH_REMATCH[2]}"
  fi

  if [ -z "$ST_PID" ] || [ -z "$ST_PORT" ] || [ -z "$ST_STARTED" ]; then
    echo "PID file at $PID_FILE is missing required fields (pid/port/started_at). rm it and retry /zskills-dashboard start" >&2
    exit 1
  fi

  if [[ ! "$ST_STARTED" =~ ^[0-9T:+-]+$ ]]; then
    echo "PID file at $PID_FILE has malformed started_at; rm it and retry /zskills-dashboard start" >&2
    exit 1
  fi

  # kill -0 — failure is the expected branch (dead PID), so 2>/dev/null
  # is allowed here per CLAUDE.md rule.
  if ! kill -0 "$ST_PID" 2>/dev/null; then
    echo "Dashboard PID file is stale (PID $ST_PID not running). Run 'lsof -i :$ST_PORT' to verify port is free, then retry /zskills-dashboard start." >&2
    exit 1
  fi

  # Compute uptime via GNU date arithmetic. The started_at line is ISO-8601
  # with timezone, which `date -d` accepts directly.
  NOW_EPOCH=$(date +%s)
  STARTED_EPOCH=$(date -d "$ST_STARTED" +%s 2>/dev/null || echo "")
  if [ -z "$STARTED_EPOCH" ]; then
    UPTIME_STR="(uptime unknown — date -d could not parse '$ST_STARTED')"
  else
    SECS=$((NOW_EPOCH - STARTED_EPOCH))
    [ "$SECS" -lt 0 ] && SECS=0
    H=$((SECS / 3600))
    M=$(((SECS % 3600) / 60))
    S=$((SECS % 60))
    UPTIME_STR=$(printf '%dh %dm %ds' "$H" "$M" "$S")
  fi

  cat <<STATUS_EOF
Dashboard running at http://127.0.0.1:$ST_PORT/
  pid:      $ST_PID
  started:  $ST_STARTED
  uptime:   $UPTIME_STR
  log:      $LOG_FILE
STATUS_EOF
  exit 0
fi

restart — stop then start

Equivalent to /zskills-dashboard stop followed by /zskills-dashboard start. The long-running Python process imports modules once at startup; static HTML/CSS/JS is read from disk per-request, but a change to skills/zskills-dashboard/scripts/zskills_monitor/*.py (server, collector, route handlers) requires the process to restart to take effect. Use restart to pick up Python source changes without manually issuing two commands.

Procedure when $SUB == "restart":

1. Run the stop procedure (the entire ## stop — SIGTERM and clean up section above):
   • If $PID_FILE does not exist, the stop is a no-op (no running server to terminate); continue to step 2.
   • If $PID_FILE exists, run stop's steps 1–6 verbatim. Identity-check refusals abort the restart with the same exit-1 contract as plain stop; do NOT proceed to start a competing server.
   • On successful stop (or stale-pid cleanup), the PID file is removed and a tracking marker is written.
2. Run the start procedure (the entire ## start — launch detached server section above), steps 1–5 verbatim. A second tracking marker is written. The restart event is captured as the marker pair.

The skill is interpreted by Claude top-to-bottom. When dispatching restart, run the two procedures above in sequence — there is no duplicate bash block here because both pieces already exist verbatim higher in this file. Treat the restart as the literal composition stop && start.

Mirror

After every edit, regenerate the .claude/skills/zskills-dashboard/ mirror via the Tier-2 hook-compatible script:

bash scripts/mirror-skill.sh zskills-dashboard

mirror-skill.sh does per-file rm for orphan removal — it never invokes a recursive remove of the mirror tree, which the project's block-unsafe-generic.sh hook would block. After the script returns, diff -rq skills/zskills-dashboard/ .claude/skills/zskills-dashboard/ must be empty.

Configuration

Read-only boundary. The server reads .claude/zskills-config.json (never writes); writes only to .zskills/* (its own state — PID file, log file, monitor-state.json, tracking markers). The server treats absent/missing fields as empty rather than mutating user config.

The dashboard reads .claude/zskills-config.json for one field:

• dev_server.default_port (integer) — default port when neither DEV_PORT env nor a stub callout overrides. Read by port.sh.

Tracking markers

start and stop (and their no-op / stale variants) write a fulfilled.zskills-dashboard.<id> under .zskills/tracking/zskills-dashboard.<id>/. The id is zskills-dashboard-<utc-timestamp> passed through sanitize-pipeline-id.sh. Subdir-name layout is Option B per docs/tracking/TRACKING_NAMING.md.

status is read-only and writes nothing.

Exit codes

Code	Meaning
0	Success (server running, stopped cleanly, or no-op idempotent path)
1	Health check failed, identity mismatch (refused to kill), stale PID file under status, or PID-file malformed
2	Usage error, port already in use under start, or unknown subcommand

Key rules

• SIGTERM only (POSIX); targeted taskkill (Windows). On POSIX, never escalate to SIGKILL and never reach for process-mass-kill tools (the obvious ones are forbidden by CLAUDE.md); on a stuck process, surface manual-recovery instructions and exit 1. On Windows (Git-Bash / MSYS), Python runs no SIGTERM handler, so stop requests a graceful taskkill //PID $PID and, if still alive after the bounded wait, escalates to taskkill //PID $PID //F — a TARGETED force-terminate of the SINGLE verified PID from the PID file (identity confirmed first), NEVER a port/name mass-kill. This is consistent with the mass-kill prohibition, which targets unverified-PID-source mass-kills.
• Never bypass identity check. On POSIX both command-name AND cwd must match before stop will signal a PID; on Windows the degraded check (alive + owns-our-port + is-python) must pass. Same defense applies on start when checking an existing PID file.
• No JSON CLI parser. Use BASH_REMATCH for all parsing (PID file is .env-style; config reads via port.sh's own bash regex). Per zskills convention.
• No 2>/dev/null on fallible operations. The two exceptions documented in CLAUDE.md apply here: kill -0 (liveness — failure IS the dead-PID branch) and readlink /proc/$PID/cwd / lsof -p ... -d cwd (non-Linux fallback — failure IS the missing- /proc branch).
• MAIN_ROOT-anchored paths. Every read/write goes through $MAIN_ROOT/.zskills/..., never cwd-relative — invoking the skill from a worktree must still see the main repo's PID file.
• PYTHONPATH discipline. start prepends $PKG_PARENT to PYTHONPATH — resolved dual-lane to ${CLAUDE_PLUGIN_ROOT}/skills/zskills-dashboard/scripts (plugin lane) or $MAIN_ROOT/skills/zskills-dashboard/scripts (source/legacy) — so python3 -m zskills_monitor.server resolves the package without an install step (per DA-5). The path-list separator is interpreter-derived ($("$PYTHON" -c '...os.pathsep')), not a hardcoded : — native Windows Python reports ; even under Git Bash, and the prepend avoids a trailing-empty separator so no invalid entry is produced.
• Verify after every state change. start curls /api/health; stop polls kill -0 then verifies the port is freed via lsof.
• Tracking markers for state-changing modes only. start and stop write fulfilled.zskills-dashboard.<id>; status does not.
• Mirror via scripts/mirror-skill.sh — never use a recursive remove on the mirror tree (hook will block).