x-watch-pr-ci

Global Output Policy

• Language: English ONLY.
• Tone: Technical, Direct, and Concise.
• Efficiency: Remove all conversational fillers and greetings to save tokens.

Skill: x-watch-pr-ci — CI Watch for PR Approval Gates

Purpose

Polls a pull request's CI checks and Copilot review until checks complete (or timeout), producing a stable exit code that orchestrators use to build the interactive gate menu (EPIC-0043).

Solves the gap identified in spec-ci-watch.md §2: when x-fix-pr is invoked from the FIX-PR slot it finds zero comments because Copilot hasn't posted yet (review typically takes 30–180s). x-watch-pr-ci encapsulates the wait so every caller receives real feedback before presenting a decision gate.

Triggers

• /x-watch-pr-ci --pr-number 42 — watch PR #42 with defaults
• /x-watch-pr-ci --pr-number 42 --timeout-seconds 600 — custom timeout
• /x-watch-pr-ci --pr-number 42 --require-copilot-review false — skip Copilot wait
• /x-watch-pr-ci --pr-number 42 --no-state-file — fire-and-forget (no state persistence)

Parameters

Parameter	Type	Default	Bounds	Description
--pr-number <N>	int	— (required)	>0	PR number to monitor.
--timeout-seconds <N>	int	1800	60–7200	Global timeout.
--poll-interval-seconds <N>	int	60	15–300	Sleep between polls.
--require-copilot-review	boolean	true	—	Wait for copilot-pull-request-reviewer[bot].
--require-checks-passing	boolean	true	—	Require all checks success (not just neutral/skipped).
--copilot-review-timeout <N>	int	900	60–timeout	Copilot-specific sub-timeout.
--state-file <path>	path	.claude/state/pr-watch-<N>.json	512 chars	State file for resume.
--no-state-file	flag	—	—	Disable state persistence.

Exit Codes (Stable Public Contract — RULE-045-05)

Code	Name	Condition
0	SUCCESS	All checks green + Copilot review present (or --require-copilot-review=false).
10	CI_PENDING_PROCEED	Checks green + Copilot timeout elapsed without review. Proceed with caution.
20	CI_FAILED	A check concluded with failure, timed_out, cancelled, or action_required.
30	TIMEOUT	Global timeout elapsed with checks still pending.
40	PR_ALREADY_MERGED	PR was already merged — idempotent exit.
50	NO_CI_CONFIGURED	statusCheckRollup is empty — no CI configured.
60	PR_CLOSED	PR closed without merge.
70	PR_NOT_FOUND	PR does not exist or caller lacks permission.

These codes are a public contract. Adding a new code = MINOR bump; changing semantics = MAJOR bump (Rule 08 — SemVer).

Invocation by Orchestrators (Rule 13 INLINE-SKILL)

Skill(skill: "x-watch-pr-ci", args: "--pr-number 42")

Orchestrators MUST use this Pattern 1 INLINE-SKILL form. Bare-slash (/x-watch-pr-ci) is forbidden in delegation contexts (Rule 13 §Forbidden).

Workflow

1. VALIDATE   -> Parse and validate arguments; reject out-of-bounds values
2. RESUME     -> Load state-file if present (skip elapsed time already consumed)
3. POLL LOOP  -> while elapsed < timeout:
   a. gh pr view <N> --json state,mergedAt,statusCheckRollup
   b. gh api repos/{owner}/{repo}/pulls/{N}/reviews
   c. Classify (classify checks + copilot + prState + elapsed)
   d. Write state-file (atomic: .tmp + rename)
   e. If terminal condition → emit JSON + exit with code
   f. Sleep poll-interval-seconds
4. TIMEOUT    -> emit JSON + exit 30

Step 1 — Argument Validation

# Validate --pr-number
if [[ -z "$PR_NUMBER" || "$PR_NUMBER" -le 0 ]]; then
  echo "ERROR: --pr-number is required and must be > 0" >&2
  exit 70
fi

# Validate --timeout-seconds (60..7200)
if [[ "$TIMEOUT_SECONDS" -lt 60 || "$TIMEOUT_SECONDS" -gt 7200 ]]; then
  echo "ERROR: timeout-seconds must be in range 60..7200" >&2
  exit 1
fi

# Validate --poll-interval-seconds (15..300)
if [[ "$POLL_INTERVAL" -lt 15 || "$POLL_INTERVAL" -gt 300 ]]; then
  echo "ERROR: poll-interval-seconds must be in range 15..300" >&2
  exit 1
fi

# Validate --copilot-review-timeout (60..timeout)
if [[ "$COPILOT_TIMEOUT" -lt 60 || "$COPILOT_TIMEOUT" -gt "$TIMEOUT_SECONDS" ]]; then
  echo "ERROR: copilot-review-timeout must be in range 60..${TIMEOUT_SECONDS}" >&2
  exit 1
fi

Step 2 — Resume from State File

STATE_FILE="${STATE_FILE:-.claude/state/pr-watch-${PR_NUMBER}.json}"
ELAPSED_OFFSET=0

if [[ -z "$NO_STATE_FILE" && -f "$STATE_FILE" ]]; then
  # Load previous elapsed from state-file (resume after session restart)
  PREV_STARTED=$(jq -r '.startedAt' "$STATE_FILE" 2>/dev/null)
  if [[ "$PREV_STARTED" != "null" && -n "$PREV_STARTED" ]]; then
    ELAPSED_OFFSET=$(( $(date +%s) - $(date -d "$PREV_STARTED" +%s 2>/dev/null || date -j -f "%Y-%m-%dT%H:%M:%SZ" "$PREV_STARTED" +%s) ))
    echo "[resume] Loaded state from $STATE_FILE; offset=${ELAPSED_OFFSET}s" >&2
  fi
fi

mkdir -p "$(dirname "$STATE_FILE")"
START_EPOCH=$(date +%s)
STARTED_AT=$(date -u +"%Y-%m-%dT%H:%M:%SZ")

Step 3 — Polling Loop

COPILOT_LOGIN="copilot-pull-request-reviewer[bot]"
RATE_LIMIT_RETRIES=0
MAX_RATE_LIMIT_RETRIES=3

while true; do
  ELAPSED=$(( $(date +%s) - START_EPOCH + ELAPSED_OFFSET ))

  # ── Fetch PR state ──────────────────────────────────────────────────────
  PR_JSON=$(gh pr view "$PR_NUMBER" \
    --json state,mergedAt,statusCheckRollup 2>&1)
  GH_EXIT=$?

  if [[ $GH_EXIT -ne 0 ]]; then
    if echo "$PR_JSON" | grep -qi "Could not resolve"; then
      emit_json "PR_NOT_FOUND" "$ELAPSED" "[]" '{"present":false}' && exit 70
    fi
    if echo "$PR_JSON" | grep -qi "rate limit\|secondary rate"; then
      RATE_LIMIT_RETRIES=$((RATE_LIMIT_RETRIES + 1))
      if [[ $RATE_LIMIT_RETRIES -gt $MAX_RATE_LIMIT_RETRIES ]]; then
        emit_json "TIMEOUT" "$ELAPSED" "[]" '{"present":false}' && exit 30
      fi
      BACKOFF=$(( 30 * (2 ** (RATE_LIMIT_RETRIES - 1)) ))  # 30s, 60s, 120s
      echo "[rate-limit] retry ${RATE_LIMIT_RETRIES}/${MAX_RATE_LIMIT_RETRIES}, sleeping ${BACKOFF}s" >&2
      sleep "$BACKOFF"
      continue
    fi
    echo "[warn] gh pr view failed (exit $GH_EXIT): $PR_JSON" >&2
  fi

  RATE_LIMIT_RETRIES=0  # reset on success

  PR_STATE=$(echo "$PR_JSON" | jq -r '.state // "UNKNOWN"' 2>/dev/null)
  MERGED_AT=$(echo "$PR_JSON" | jq -r '.mergedAt // "null"' 2>/dev/null)
  CHECKS_JSON=$(echo "$PR_JSON" | jq -c '[.statusCheckRollup[]? | {name: .name, conclusion: (.conclusion // .status // "pending")}]' 2>/dev/null || echo "[]")

  # ── Classify early-exit conditions ─────────────────────────────────────
  if [[ "$PR_STATE" == "MERGED" || ("$MERGED_AT" != "null" && -n "$MERGED_AT") ]]; then
    emit_json "PR_ALREADY_MERGED" "$ELAPSED" "$CHECKS_JSON" '{"present":false}' && exit 40
  fi

  if [[ "$PR_STATE" == "CLOSED" ]]; then
    emit_json "PR_CLOSED" "$ELAPSED" "$CHECKS_JSON" '{"present":false}' && exit 60
  fi

  # ── Fetch Copilot review ────────────────────────────────────────────────
  OWNER_REPO=$(gh repo view --json nameWithOwner -q '.nameWithOwner' 2>/dev/null)
  REVIEWS_JSON=$(gh api "repos/${OWNER_REPO}/pulls/${PR_NUMBER}/reviews" 2>/dev/null || echo "[]")
  COPILOT_REVIEW=$(echo "$REVIEWS_JSON" | jq --arg login "$COPILOT_LOGIN" \
    'map(select(.user.login == $login)) | if length > 0 then {present: true, reviewId: .[0].id} else {present: false} end' 2>/dev/null \
    || echo '{"present":false}')
  COPILOT_PRESENT=$(echo "$COPILOT_REVIEW" | jq -r '.present' 2>/dev/null || echo "false")

  # ── Check empty CI (NO_CI_CONFIGURED) ──────────────────────────────────
  CHECK_COUNT=$(echo "$CHECKS_JSON" | jq 'length' 2>/dev/null || echo "0")
  if [[ "$CHECK_COUNT" -eq 0 ]]; then
    emit_json "NO_CI_CONFIGURED" "$ELAPSED" "[]" "$COPILOT_REVIEW" && exit 50
  fi

  # ── Detect failing checks ───────────────────────────────────────────────
  FAILING=$(echo "$CHECKS_JSON" | jq '[.[] | select(.conclusion | IN("failure","timed_out","cancelled","action_required"))] | length' 2>/dev/null || echo "0")
  if [[ "$FAILING" -gt 0 ]]; then
    emit_json "CI_FAILED" "$ELAPSED" "$CHECKS_JSON" "$COPILOT_REVIEW" && exit 20
  fi

  # ── Check all-green ─────────────────────────────────────────────────────
  NON_GREEN=$(echo "$CHECKS_JSON" | jq '[.[] | select(.conclusion | IN("success","neutral","skipped") | not)] | length' 2>/dev/null || echo "1")
  ALL_GREEN=$(( NON_GREEN == 0 ))

  if [[ "$ALL_GREEN" -eq 1 ]]; then
    if [[ "$REQUIRE_COPILOT_REVIEW" == "false" || "$COPILOT_PRESENT" == "true" ]]; then
      emit_json "SUCCESS" "$ELAPSED" "$CHECKS_JSON" "$COPILOT_REVIEW" && exit 0
    fi
    COPILOT_ELAPSED=$(( $(date +%s) - START_EPOCH ))
    if [[ "$COPILOT_ELAPSED" -ge "$COPILOT_REVIEW_TIMEOUT" ]]; then
      emit_json "CI_PENDING_PROCEED" "$ELAPSED" "$CHECKS_JSON" "$COPILOT_REVIEW" && exit 10
    fi
  fi

  # ── Global timeout check ────────────────────────────────────────────────
  if [[ "$ELAPSED" -ge "$TIMEOUT_SECONDS" ]]; then
    emit_json "TIMEOUT" "$ELAPSED" "$CHECKS_JSON" "$COPILOT_REVIEW" && exit 30
  fi

  # ── Write state-file (atomic: .tmp + rename) ────────────────────────────
  if [[ -z "$NO_STATE_FILE" ]]; then
    POLL_COUNT=$(( ${POLL_COUNT:-0} + 1 ))
    LAST_POLL_AT=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
    jq -n \
      --argjson prNumber "$PR_NUMBER" \
      --arg startedAt "$STARTED_AT" \
      --arg lastPollAt "$LAST_POLL_AT" \
      --argjson pollCount "$POLL_COUNT" \
      --argjson checksSnapshot "$CHECKS_JSON" \
      --argjson copilotReview "$COPILOT_REVIEW" \
      --arg schemaVersion "1.0" \
      '{
        prNumber: $prNumber,
        startedAt: $startedAt,
        lastPollAt: $lastPollAt,
        pollCount: $pollCount,
        checksSnapshot: $checksSnapshot,
        copilotReview: $copilotReview,
        schemaVersion: $schemaVersion
      }' > "${STATE_FILE}.tmp" 2>/dev/null \
    && mv "${STATE_FILE}.tmp" "$STATE_FILE"
  fi

  echo "[poll ${POLL_COUNT}] elapsed=${ELAPSED}s allGreen=${ALL_GREEN} copilot=${COPILOT_PRESENT}" >&2
  sleep "$POLL_INTERVAL"
done

Helper: emit_json

emit_json() {
  local status="$1" elapsed="$2" checks="$3" copilot="$4"
  jq -n \
    --arg status "$status" \
    --argjson prNumber "$PR_NUMBER" \
    --argjson checks "$checks" \
    --argjson copilotReview "$copilot" \
    --argjson elapsedSeconds "$elapsed" \
    '{
      status: $status,
      prNumber: $prNumber,
      checks: $checks,
      copilotReview: $copilotReview,
      elapsedSeconds: $elapsedSeconds
    }'
}

State File Schema (RULE-045-03)

Location: .claude/state/pr-watch-<N>.json

{
  "prNumber": 42,
  "startedAt": "2026-04-20T10:00:00Z",
  "lastPollAt": "2026-04-20T10:01:05Z",
  "pollCount": 2,
  "checksSnapshot": [
    {"name": "build", "conclusion": "success"},
    {"name": "test", "conclusion": "success"}
  ],
  "copilotReview": {"present": true, "reviewId": 12345678},
  "schemaVersion": "1.0"
}

Write is atomic: write to <path>.tmp, then rename. On corrupted state: log warning and restart from zero.

Stdout Contract

Progress logs go to stderr. The final JSON summary is the last line on stdout:

{
  "status": "SUCCESS",
  "prNumber": 42,
  "checks": [
    {"name": "build", "conclusion": "success"},
    {"name": "test",  "conclusion": "success"}
  ],
  "copilotReview": {"present": true, "reviewId": 12345678},
  "elapsedSeconds": 87
}

Edge Cases

Scenario	Behaviour
Rate limit	Exponential backoff 3× (30s, 60s, 120s); after 3rd failure exit 30 (TIMEOUT)
Copilot not configured in repo	Detected after 1st poll (absent from requested_reviewers); downgrade to CI_PENDING_PROCEED
State file corrupted	Log warning, reset poll state, continue from elapsed=0
PR closed during polling	Exit 60 immediately
PR merged during polling	Exit 40 immediately

Rule Compliance

• Rule 13: orchestrators invoke via Skill(skill: "x-watch-pr-ci", args: "...") — no bare-slash in delegation
• Rule 14: skill does NOT create worktrees (sequential, runs in caller's working tree)
• RULE-045-03: state-file atomic write + resume
• RULE-045-04: Copilot identified by exact login copilot-pull-request-reviewer[bot]
• RULE-045-05: exit codes 0/10/20/30/40/50/60/70 are stable public contract
• RULE-045-06: orchestrators use Rule 13 Pattern 1 INLINE-SKILL