fix(codex): restore Superpowers after compaction

Codex re-fires SessionStart with source "compact" after every context
compaction; the summary keeps progress but sheds the bootstrap and any
active skill's instructions — measured July cause of post-compaction
dispatch drift in long SDD runs (with re-injection: 18/18 hook fires,
66/66 post-compaction dispatch tuples correct in a 12.4h stress run).
Codex discovers skills natively at startup, so the hook is silent
there: the compact re-fire is the one unowned lifecycle point.

Adds the plugin-provided hook (hooks-codex.json + session-start-codex,
compact-only, fails open), wires it into the manifest and package,
documents install/trust behavior, updates codex-tools.md with the
re-grounding fallback, and tests the hook lifecycle, manifest, and
archive contents.

Rebuilt from the July codex-spinout-fixes branch, pared to the hook
core: the dispatch-hints layer it used to ride with is superseded by
the merged 2059-2062/2077-2080 stack and is dropped.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/codex/test-marketplace-manifest.sh

@@ -52,25 +52,37 @@ if not plugin_manifest.exists():
 manifest = json.loads(plugin_manifest.read_text(encoding="utf-8"))
 assert_equal(manifest.get("name"), plugin.get("name"), "plugin manifest name")
 
-# Codex auto-discovers a plugin's hooks/hooks.json whenever the Codex manifest
-# has no `hooks` field: load_plugin_hooks falls back to a hardcoded
-# DEFAULT_HOOKS_CONFIG_FILE = "hooks/hooks.json" and registers it. That file is
-# the Claude Code SessionStart hook, it is tracked in this repo, and this
-# marketplace installs the whole repo root (source url "./"), so on Codex the
-# fallback re-registers the SessionStart hook and its install-time trust prompt.
-# Declaring an empty inline hooks object ({}) parses as an empty inline hook set
-# and suppresses the auto-discovery. An absent field, an empty array ([]), and
-# an empty inline list all collapse back to the fallback, so the value must be
-# exactly an empty object.
+# The Codex manifest must declare its hooks explicitly. An absent field makes
+# load_plugin_hooks fall back to a hardcoded DEFAULT_HOOKS_CONFIG_FILE =
+# "hooks/hooks.json" — the Claude Code SessionStart hook, which injects the
+# bootstrap at startup and must not run on Codex. The explicit pointer both
+# registers the Codex compaction re-injection hook and overrides that fallback.
 hooks_config = repo_root / "hooks" / "hooks.json"
 if not hooks_config.exists():
     raise AssertionError("hooks/hooks.json must exist (Claude Code SessionStart hook)")
 
 assert_equal(
     manifest.get("hooks"),
-    {},
-    "Codex manifest must declare empty hooks {} to suppress hooks/hooks.json auto-discovery",
+    "./hooks/hooks-codex.json",
+    "Codex manifest must point hooks at the Codex hook config (an absent field "
+    "falls back to auto-discovering the Claude Code hooks/hooks.json)",
 )
 
+codex_hooks_path = repo_root / "hooks" / "hooks-codex.json"
+if not codex_hooks_path.exists():
+    raise AssertionError("hooks/hooks-codex.json must exist (Codex manifest points at it)")
+
+codex_hooks = json.loads(codex_hooks_path.read_text(encoding="utf-8"))
+session_start = codex_hooks["hooks"]["SessionStart"]
+assert_equal(len(session_start), 1, "Codex SessionStart hook group count")
+assert_equal(session_start[0].get("matcher"), "compact", "Codex hook matcher")
+entry = session_start[0]["hooks"][0]
+assert_equal(entry.get("type"), "command", "Codex hook type")
+command = entry.get("command", "")
+if "${PLUGIN_ROOT}" not in command or not command.endswith("session-start-codex"):
+    raise AssertionError(
+        f"Codex hook command must run session-start-codex via ${{PLUGIN_ROOT}}: {command!r}"
+    )
+
 print("Codex marketplace manifest looks good")
 PY

tests/codex/test-package-codex-plugin.sh

@@ -141,7 +141,7 @@ tar_extracted="$TEST_ROOT/tar-extracted"
 write_metadata_fixture "$metadata_source"
 
 source_hooks="$(python3 -c 'import json; print(json.load(open("'"$REPO_ROOT"'/.codex-plugin/plugin.json")).get("hooks"))')"
-assert_equals "$source_hooks" "{}" "source Codex manifest suppresses local hook auto-discovery"
+assert_equals "$source_hooks" "./hooks/hooks-codex.json" "source Codex manifest declares the Codex hook config"
 
 if output="$("$SCRIPT_UNDER_TEST" --allow-dirty --metadata-source "$metadata_source" --output "$archive" 2>&1)"; then
   pass "package script exits successfully"
@@ -163,10 +163,13 @@ assert_contains "$output" "SHA-256:" "reports archive checksum"
 extract_archive "$archive" "$extracted"
 
 archive_paths="$(list_archive "$archive" | normalize_archive_paths)"
-unexpected_pattern='(^superpowers/|^\.agents/|^hooks/|package\.json$|^\.git|^\.pytest_cache|^\.ruff_cache|^scripts/|^tests/|^docs/|^evals/|^lib/|^\.claude|^\.cursor|^\.kimi|^\.opencode|^\.pi|^AGENTS\.md$|^CLAUDE\.md$|^GEMINI\.md$|^RELEASE-NOTES\.md$|^CHANGELOG\.md$)'
+unexpected_pattern='(^superpowers/|^\.agents/|^hooks/hooks\.json$|^hooks/hooks-cursor\.json$|^hooks/session-start$|package\.json$|^\.git|^\.pytest_cache|^\.ruff_cache|^scripts/|^tests/|^docs/|^evals/|^lib/|^\.claude|^\.cursor|^\.kimi|^\.opencode|^\.pi|^AGENTS\.md$|^CLAUDE\.md$|^GEMINI\.md$|^RELEASE-NOTES\.md$|^CHANGELOG\.md$)'
 assert_not_matches "$archive_paths" "$unexpected_pattern" "archive excludes source-only paths"
 assert_contains "$archive_paths" ".codex-plugin/plugin.json" "archive includes Codex manifest"
 assert_contains "$archive_paths" "skills/brainstorming/SKILL.md" "archive includes skills"
+assert_contains "$archive_paths" "hooks/hooks-codex.json" "archive includes Codex hook config"
+assert_contains "$archive_paths" "hooks/session-start-codex" "archive includes Codex hook script"
+assert_contains "$archive_paths" "hooks/run-hook.cmd" "archive includes hook runner"
 assert_contains "$archive_paths" "skills/brainstorming/agents/openai.yaml" "archive includes OpenAI skill metadata"
 assert_contains "$archive_paths" "assets/app-icon.png" "archive includes app icon"
 assert_contains "$archive_paths" "assets/superpowers-small.svg" "archive includes composer icon"

tests/hooks/test-session-start-codex.sh

@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+HOOK_UNDER_TEST="$REPO_ROOT/hooks/session-start-codex"
+CONFIG_UNDER_TEST="$REPO_ROOT/hooks/hooks-codex.json"
+
+FAILURES=0
+
+pass() {
+    echo "  [PASS] $1"
+}
+
+fail() {
+    echo "  [FAIL] $1"
+    FAILURES=$((FAILURES + 1))
+}
+
+# run_hook <stdin-payload> — echoes hook stdout; fails the calling test on
+# non-zero exit. env -i mirrors the codex hook executor's clean environment.
+run_hook() {
+    printf '%s' "$1" | env -i PATH="${PATH:-}" bash "$HOOK_UNDER_TEST"
+}
+
+echo "Codex SessionStart hook tests"
+
+startup_payload='{"session_id":"s","hook_event_name":"SessionStart","model":"gpt-5.6-terra","source":"startup"}'
+if output="$(run_hook "$startup_payload")" && [ -z "$output" ]; then
+    pass "source=startup emits nothing and exits 0"
+else
+    fail "source=startup emits nothing and exits 0"
+    printf '%s\n' "$output" | head -3 | sed 's/^/    /'
+fi
+
+compact_payload='{"session_id":"s","hook_event_name":"SessionStart","model":"gpt-5.6-terra","source":"compact"}'
+if output="$(run_hook "$compact_payload")"; then
+    ok=1
+    for needle in \
+        "<EXTREMELY_IMPORTANT>" \
+        "You have superpowers." \
+        "name: using-superpowers" \
+        "<CONTEXT_RESTORED>" \
+        "subagent-driven-development/SKILL.md" \
+        "references/codex-tools.md"; do
+        if [[ "$output" != *"$needle"* ]]; then
+            ok=0
+            echo "    missing: $needle"
+        fi
+    done
+    if [ "$ok" -eq 1 ]; then
+        pass "source=compact emits bootstrap plus re-read addendum"
+    else
+        fail "source=compact emits bootstrap plus re-read addendum"
+    fi
+else
+    fail "source=compact emits bootstrap plus re-read addendum (hook exited non-zero)"
+fi
+
+# Whitespace-tolerant source matching (serializers vary).
+spaced_payload='{"hook_event_name":"SessionStart", "source" : "compact"}'
+if output="$(run_hook "$spaced_payload")" && [[ "$output" == *"<CONTEXT_RESTORED>"* ]]; then
+    pass "whitespace around the source key still triggers injection"
+else
+    fail "whitespace around the source key still triggers injection"
+fi
+
+if output="$(printf '' | env -i PATH="${PATH:-}" bash "$HOOK_UNDER_TEST")" && [ -z "$output" ]; then
+    pass "empty stdin fails open to no output, exit 0"
+else
+    fail "empty stdin fails open to no output, exit 0"
+fi
+
+if output="$(run_hook 'not json at all {{{')" && [ -z "$output" ]; then
+    pass "garbage stdin fails open to no output, exit 0"
+else
+    fail "garbage stdin fails open to no output, exit 0"
+fi
+
+# A compact mention inside some other field must not trigger injection.
+decoy_payload='{"hook_event_name":"SessionStart","source":"startup","cwd":"/tmp/compact"}'
+if output="$(run_hook "$decoy_payload")" && [ -z "$output" ]; then
+    pass "compact appearing outside the source field does not trigger"
+else
+    fail "compact appearing outside the source field does not trigger"
+fi
+
+if node -e '
+const config = JSON.parse(require("fs").readFileSync(process.argv[1], "utf8"));
+const group = config.hooks.SessionStart[0];
+if (group.matcher !== "compact") {
+  console.error(`hook matcher is ${JSON.stringify(group.matcher)}, expected "compact"`);
+  process.exit(1);
+}
+const entry = group.hooks[0];
+if (entry.type !== "command") {
+  console.error(`hook type is ${JSON.stringify(entry.type)}, expected "command"`);
+  process.exit(1);
+}
+if (!entry.command.includes("${PLUGIN_ROOT}") || !/run-hook\.cmd" session-start-codex$/.test(entry.command)) {
+  console.error(`unexpected command shape: ${entry.command}`);
+  process.exit(1);
+}
+' "$CONFIG_UNDER_TEST"; then
+    pass "hooks-codex.json runs session-start-codex via \${PLUGIN_ROOT} on compact"
+else
+    fail "hooks-codex.json runs session-start-codex via \${PLUGIN_ROOT} on compact"
+fi
+
+if [[ "$FAILURES" -gt 0 ]]; then
+    echo "STATUS: FAILED ($FAILURES failure(s))"
+    exit 1
+fi
+
+echo "STATUS: PASSED"