gstack/test/codex-hardening.test.ts

import { describe, test, expect } from 'bun:test';
import { spawnSync } from 'child_process';
import * as path from 'path';
import * as fs from 'fs';
import * as os from 'os';

const ROOT = path.resolve(import.meta.dir, '..');
const PROBE = path.join(ROOT, 'bin/gstack-codex-probe');

// Run a bash snippet that sources the probe and evaluates one of its functions.
// Controlled env + optional tempdir for HOME isolation.
function runProbe(opts: {
  snippet: string;
  env?: Record<string, string | undefined>;
  home?: string;
}): { stdout: string; stderr: string; status: number } {
  const env: Record<string, string> = {
    // Start from a clean env so test-env vars from the parent don't leak in.
    PATH: process.env.PATH ?? '',
    _TEL: 'off',
  };
  if (opts.home) env.HOME = opts.home;
  // Apply overrides; undefined means "remove".
  if (opts.env) {
    for (const [k, v] of Object.entries(opts.env)) {
      if (v === undefined) {
        delete env[k];
      } else {
        env[k] = v;
      }
    }
  }
  const script = `set +e\nsource "${PROBE}"\n${opts.snippet}\n`;
  const result = spawnSync('bash', ['-c', script], {
    env,
    stdio: ['pipe', 'pipe', 'pipe'],
    timeout: 5000,
  });
  return {
    stdout: (result.stdout ?? '').toString(),
    stderr: (result.stderr ?? '').toString(),
    status: result.status ?? -1,
  };
}

function tempHome(): string {
  return fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-codex-probe-home-'));
}

describe('gstack-codex-probe: auth probe', () => {
  test('CODEX_API_KEY set → AUTH_OK', () => {
    const home = tempHome();
    try {
      const r = runProbe({
        snippet: '_gstack_codex_auth_probe',
        env: { CODEX_API_KEY: 'sk-test' },
        home,
      });
      expect(r.stdout.trim()).toBe('AUTH_OK');
      expect(r.status).toBe(0);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('OPENAI_API_KEY set → AUTH_OK', () => {
    const home = tempHome();
    try {
      const r = runProbe({
        snippet: '_gstack_codex_auth_probe',
        env: { OPENAI_API_KEY: 'sk-openai' },
        home,
      });
      expect(r.stdout.trim()).toBe('AUTH_OK');
      expect(r.status).toBe(0);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('${CODEX_HOME:-~/.codex}/auth.json exists → AUTH_OK', () => {
    const home = tempHome();
    try {
      fs.mkdirSync(path.join(home, '.codex'), { recursive: true });
      fs.writeFileSync(path.join(home, '.codex', 'auth.json'), '{}');
      const r = runProbe({ snippet: '_gstack_codex_auth_probe', home });
      expect(r.stdout.trim()).toBe('AUTH_OK');
      expect(r.status).toBe(0);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('no env + no file → AUTH_FAILED with exit 1', () => {
    const home = tempHome();
    try {
      const r = runProbe({ snippet: '_gstack_codex_auth_probe', home });
      expect(r.stdout.trim()).toBe('AUTH_FAILED');
      expect(r.status).toBe(1);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('both CODEX_API_KEY and OPENAI_API_KEY set → AUTH_OK', () => {
    const home = tempHome();
    try {
      const r = runProbe({
        snippet: '_gstack_codex_auth_probe',
        env: { CODEX_API_KEY: 'k1', OPENAI_API_KEY: 'k2' },
        home,
      });
      expect(r.stdout.trim()).toBe('AUTH_OK');
      expect(r.status).toBe(0);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('empty-string env vars + no file → AUTH_FAILED', () => {
    const home = tempHome();
    try {
      const r = runProbe({
        snippet: '_gstack_codex_auth_probe',
        env: { CODEX_API_KEY: '', OPENAI_API_KEY: '' },
        home,
      });
      expect(r.stdout.trim()).toBe('AUTH_FAILED');
      expect(r.status).toBe(1);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('whitespace-only env vars + no file → AUTH_FAILED', () => {
    const home = tempHome();
    try {
      const r = runProbe({
        snippet: '_gstack_codex_auth_probe',
        env: { CODEX_API_KEY: '   ', OPENAI_API_KEY: '\t\n' },
        home,
      });
      expect(r.stdout.trim()).toBe('AUTH_FAILED');
      expect(r.status).toBe(1);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('alternate $CODEX_HOME → checks the alternate path', () => {
    const home = tempHome();
    const altCodex = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-alt-codex-'));
    try {
      fs.writeFileSync(path.join(altCodex, 'auth.json'), '{}');
      const r = runProbe({
        snippet: '_gstack_codex_auth_probe',
        env: { CODEX_HOME: altCodex },
        home,
      });
      expect(r.stdout.trim()).toBe('AUTH_OK');
      expect(r.status).toBe(0);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
      fs.rmSync(altCodex, { recursive: true, force: true });
    }
  });
});

// --- Group 2: Version check -------------------------------------------------
// Stub `codex --version` by putting a fake `codex` executable on PATH.
function tempStubCodex(versionOutput: string, bool_command_fails = false): {
  dir: string;
  pathEntry: string;
} {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-codex-stub-'));
  const bin = path.join(dir, 'codex');
  const script = bool_command_fails
    ? '#!/bin/bash\nexit 1\n'
    : `#!/bin/bash\nif [ "$1" = "--version" ]; then printf '%s' ${JSON.stringify(versionOutput)}; fi\n`;
  fs.writeFileSync(bin, script);
  fs.chmodSync(bin, 0o755);
  return { dir, pathEntry: dir };
}

function runVersionCheck(versionOutput: string): string {
  const stub = tempStubCodex(versionOutput);
  try {
    const r = runProbe({
      snippet: '_gstack_codex_version_check',
      env: { PATH: `${stub.pathEntry}:${process.env.PATH}` },
    });
    return r.stdout + r.stderr;
  } finally {
    fs.rmSync(stub.dir, { recursive: true, force: true });
  }
}

describe('gstack-codex-probe: version check (anchored regex per Tension I)', () => {
  // Matches (should WARN)
  test('codex-cli 0.120.0 → WARN', () => {
    const out = runVersionCheck('codex-cli 0.120.0\n');
    expect(out).toContain('WARN:');
    expect(out).toContain('0.120.0');
  });

  test('codex-cli 0.120.1 → WARN', () => {
    const out = runVersionCheck('codex-cli 0.120.1\n');
    expect(out).toContain('WARN:');
  });

  test('codex-cli 0.120.2 → WARN', () => {
    const out = runVersionCheck('codex-cli 0.120.2\n');
    expect(out).toContain('WARN:');
  });

  // Does NOT match (should be silent)
  test('codex-cli 0.116.0 → OK (no warn)', () => {
    const out = runVersionCheck('codex-cli 0.116.0\n');
    expect(out).not.toContain('WARN:');
  });

  test('codex-cli 0.121.0 → OK (no warn)', () => {
    const out = runVersionCheck('codex-cli 0.121.0\n');
    expect(out).not.toContain('WARN:');
  });

  test('codex-cli 0.120.10 → OK (anchored regex prevents substring match)', () => {
    const out = runVersionCheck('codex-cli 0.120.10\n');
    expect(out).not.toContain('WARN:');
  });

  test('codex-cli 0.120.20 → OK (anchored regex prevents substring match)', () => {
    const out = runVersionCheck('codex-cli 0.120.20\n');
    expect(out).not.toContain('WARN:');
  });

  test('codex-cli 0.120.2-beta → WARN (still a bad release family)', () => {
    // 0.120.2-beta: regex (^|[^0-9.])0\.120\.(0|1|2)([^0-9.]|$) treats '-' as a
    // non-digit/non-dot boundary → matches.
    const out = runVersionCheck('codex-cli 0.120.2-beta\n');
    expect(out).toContain('WARN:');
  });

  test('empty output → OK (silent, no crash)', () => {
    const out = runVersionCheck('');
    expect(out).not.toContain('WARN:');
  });

  test('v-prefixed and multiline handled', () => {
    const out = runVersionCheck('codex-cli v0.116.0\nsome debug line\n');
    expect(out).not.toContain('WARN:');
  });
});

// --- Group 3: Timeout wrapper + namespace hygiene ---------------------------

describe('gstack-codex-probe: timeout wrapper + namespace hygiene', () => {
  test('bin/gstack-codex-probe is syntactically valid bash (bash -n)', () => {
    const result = spawnSync('bash', ['-n', PROBE], { timeout: 5000 });
    expect(result.status).toBe(0);
  });

  test('timeout wrapper executes command directly when neither binary present', () => {
    // Clear PATH to simulate no timeout/gtimeout. Use only /bin for `echo`.
    const r = runProbe({
      snippet: `_gstack_codex_timeout_wrapper 5 echo hello_world`,
      env: { PATH: '/bin:/usr/bin' }, // these usually lack gtimeout; timeout may exist on linux
    });
    // Regardless of whether timeout is on this PATH, echo hello_world should succeed.
    expect(r.stdout.trim()).toBe('hello_world');
  });

  test('timeout wrapper resolves gtimeout preferentially when on PATH', () => {
    // Create a stub gtimeout that prints a sentinel so we can verify it was chosen.
    const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-gto-stub-'));
    try {
      const stub = path.join(dir, 'gtimeout');
      fs.writeFileSync(stub, '#!/bin/bash\necho gtimeout_chosen_$1\n');
      fs.chmodSync(stub, 0o755);
      const r = runProbe({
        snippet: `_gstack_codex_timeout_wrapper 5 echo nope`,
        env: { PATH: `${dir}:/bin:/usr/bin` },
      });
      expect(r.stdout.trim()).toBe('gtimeout_chosen_5');
    } finally {
      fs.rmSync(dir, { recursive: true, force: true });
    }
  });

  test('bash-native watchdog kills a hung command at the deadline (exit 124, no timeout binary)', () => {
    // Stock macOS ships neither gtimeout nor timeout(1) — the old fallback ran
    // the command unwrapped, so a hung `codex exec` blocked the calling
    // workflow forever. Force the fallback everywhere (Linux /bin has timeout
    // via usrmerge) with a PATH holding ONLY bash and sleep, then prove a
    // 30s sleep dies at the 1s deadline with timeout(1)'s exit code. The
    // runProbe 5s spawnSync cap doubles as the "actually killed fast" bound.
    const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-watchdog-'));
    try {
      const which = (tool: string) =>
        spawnSync('bash', ['-c', `command -v ${tool}`], { timeout: 30_000 }).stdout.toString().trim() || `/bin/${tool}`;
      fs.symlinkSync(which('bash'), path.join(dir, 'bash'));
      fs.symlinkSync(which('sleep'), path.join(dir, 'sleep'));
      const r = runProbe({
        snippet: `_gstack_codex_timeout_wrapper 1 sleep 30; echo "rc=$?"`,
        env: { PATH: dir },
      });
      expect(r.stdout).toContain('rc=124');
    } finally {
      fs.rmSync(dir, { recursive: true, force: true });
    }
  });

  test('sourcing probe does NOT set errexit/trap/IFS in caller shell (namespace hygiene)', () => {
    // Capture `set -o` output before and after sourcing. Any drift means the
    // probe polluted the caller.
    const r = runProbe({
      snippet: `
BEFORE=$(set -o | sort)
source "${PROBE}"   # source again to catch accumulation
AFTER=$(set -o | sort)
if [ "$BEFORE" = "$AFTER" ]; then
  echo "CLEAN"
else
  echo "POLLUTED"
  diff <(echo "$BEFORE") <(echo "$AFTER")
fi
`,
    });
    expect(r.stdout).toContain('CLEAN');
  });
});

// --- Group 4: Telemetry event emission --------------------------------------

describe('gstack-codex-probe: telemetry event emission', () => {
  test('_gstack_codex_log_event writes jsonl when _TEL != off', () => {
    const home = tempHome();
    try {
      const r = runProbe({
        snippet: `_gstack_codex_log_event "codex_test_event" "42"; cat "$HOME/.gstack/analytics/skill-usage.jsonl"`,
        env: { _TEL: 'community' },
        home,
      });
      expect(r.stdout).toContain('"event":"codex_test_event"');
      expect(r.stdout).toContain('"duration_s":"42"');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('_gstack_codex_log_event skips write when _TEL = off', () => {
    const home = tempHome();
    try {
      runProbe({
        snippet: `_gstack_codex_log_event "codex_test_event" "99"`,
        env: { _TEL: 'off' },
        home,
      });
      const jsonl = path.join(home, '.gstack/analytics/skill-usage.jsonl');
      expect(fs.existsSync(jsonl)).toBe(false);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('payload never contains prompt content, env values, or auth tokens (schema check)', () => {
    const home = tempHome();
    try {
      const r = runProbe({
        snippet: `_gstack_codex_log_event "codex_test_event" "1"; cat "$HOME/.gstack/analytics/skill-usage.jsonl"`,
        env: {
          _TEL: 'community',
          CODEX_API_KEY: 'SECRET_TOKEN_SHOULD_NOT_LEAK',
          OPENAI_API_KEY: 'ANOTHER_SECRET',
        },
        home,
      });
      // The emitted JSON payload should ONLY have {skill, event, duration_s, ts}.
      // Specifically, it must not contain any env values or auth material.
      expect(r.stdout).not.toContain('SECRET_TOKEN_SHOULD_NOT_LEAK');
      expect(r.stdout).not.toContain('ANOTHER_SECRET');
      // Schema: exactly these keys, in any order.
      const parsed = JSON.parse(r.stdout.trim().split('\n').pop() ?? '{}');
      expect(Object.keys(parsed).sort()).toEqual(['duration_s', 'event', 'skill', 'ts']);
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });
});

// ── Step 2A argv guard ─────────────────────────────────────────────────────
// Regression test for #1428: Codex CLI >=0.130.0 rejects passing a quoted
// prompt argument together with `--base <branch>`. Step 2A must never combine
// the two on the same line. Step 2A lives in the carved review-mode section
// (codex/sections/review-mode.md, generated from its .md.tmpl) — asserts
// across both the .tmpl source and the generated section so template drift
// can't silently re-introduce the bug.

describe('codex review-mode section Step 2A: PROMPT + --base mutual exclusion guard', () => {
  function extractStep2A(filePath: string): string {
    const content = fs.readFileSync(filePath, 'utf-8');
    const startIdx = content.indexOf('## Step 2A: Review Mode');
    expect(startIdx).toBeGreaterThan(-1);
    // End at next `## ` heading (skill section boundary).
    const tail = content.slice(startIdx);
    const nextHeading = tail.slice(2).search(/\n## /);
    const section = nextHeading === -1 ? tail : tail.slice(0, nextHeading + 2);
    // Non-empty extraction: a carve/regen that leaves only the heading behind
    // must fail here, not silently pass a vacuous scan.
    expect(section.length).toBeGreaterThan(1000);
    return section;
  }

  for (const relPath of ['codex/sections/review-mode.md.tmpl', 'codex/sections/review-mode.md']) {
    test(`${relPath}: no \`codex review\` line combines a quoted prompt argument with --base`, () => {
      const section = extractStep2A(path.join(ROOT, relPath));
      // Find all lines invoking `codex review` (any prefix wrapper allowed).
      const lines = section.split('\n');
      const offendingLines: string[] = [];
      for (const line of lines) {
        // Skip prose lines that just discuss codex review. Only inspect lines
        // that look like an actual shell invocation (codex review followed by
        // a non-prose token).
        const match = line.match(/\bcodex\s+review\b(.*)$/);
        if (!match) continue;
        const rest = match[1];
        // Two regression patterns:
        //   codex review "..." --base <foo>
        //   codex review $VAR --base <foo>
        //   codex review -- "..." --base <foo>
        // Acceptable: codex review --base <foo>   (bare, no prompt arg)
        const hasBase = /--base\b/.test(rest);
        if (!hasBase) continue;
        // Strip --base <token> and any trailing -c/--enable flags so they
        // don't look like positional args. Anything that remains BEFORE
        // --base and looks like a positional is the regression.
        const beforeBase = rest.split(/--base\b/)[0].trim();
        // Empty (or just whitespace) before --base => bare review, safe.
        if (beforeBase === '') continue;
        // Allow `--` separator that introduces nothing else (rare). Anything
        // that looks like a quoted string OR variable expansion is the bug.
        if (/^["'$]|^--\s*["']/.test(beforeBase)) {
          offendingLines.push(line);
        }
      }
      expect(offendingLines).toEqual([]);
    });

    test(`${relPath}: Step 2A still contains at least one fix-path invocation`, () => {
      const section = extractStep2A(path.join(ROOT, relPath));
      // At least one of: bare `codex review --base` OR `codex exec ...` must
      // remain. Guards against accidental deletion of both fix paths.
      const bareReview = /codex\s+review\s+--base\b/.test(section);
      const execRoute = /codex\s+exec\b/.test(section);
      expect(bareReview || execRoute).toBe(true);
    });
  }
});

// Regression guard for #1036. The wrapper added in #1056 was wired into
// codex/SKILL.md but not into the /review and /ship diff passes, which kept
// running under a bare 5-minute Bash gate. Measured on codex-cli 0.145.0: a
// pass was killed at 287s of a 300s budget mid-tool-call, and the same prompt
// completed in 336s. An unwrapped stall returns no exit code and no output,
// which downstream reads as "Codex reviewed and found nothing".
describe('codex timeout wrapper: /review + /ship diff passes', () => {
  const WRAPPED_SITES = [
    'scripts/resolvers/review.ts', // generator (source of truth)
    'review/sections/adversarial.md', // review section (Step 5.7 carved out of the skeleton)
    'ship/sections/adversarial.md', // ship section source
  ];

  // Outer Bash gate for the wrapped passes. The wrapper must be strictly
  // shorter so IT fires first and the failure is a diagnosable exit 124.
  const BASH_GATE_MS = 600000;

  for (const relPath of WRAPPED_SITES) {
    const read = () => fs.readFileSync(path.join(ROOT, relPath), 'utf8');

    test(`${relPath}: both diff-review Codex calls run under the wrapper`, () => {
      const wrapped =
        read().match(/_gstack_codex_timeout_wrapper\s+\d+\s+codex\s+(exec|review)\b/g) ?? [];
      // Adversarial pass + structured review pass.
      expect(wrapped.length).toBeGreaterThanOrEqual(2);
    });

    test(`${relPath}: does not claim \`timeout\` is unavailable on macOS`, () => {
      // _gstack_codex_timeout_wrapper resolves gtimeout -> timeout -> unwrapped,
      // so the coreutils-less case is already handled. The old claim is what
      // steered these call sites away from the wrapper in the first place.
      expect(read()).not.toMatch(/doesn't exist on macOS/);
    });

    test(`${relPath}: wrapper budget stays under the outer Bash gate`, () => {
      const budgets = [...read().matchAll(/_gstack_codex_timeout_wrapper\s+(\d+)\s+codex\b/g)].map(
        (m) => Number(m[1]) * 1000,
      );
      expect(budgets.length).toBeGreaterThan(0);
      for (const ms of budgets) {
        // Inverting this makes the wrapper unreachable: the harness kills the
        // call first and the exit-124 branch below it becomes dead code.
        expect(ms).toBeLessThan(BASH_GATE_MS);
      }
    });
  }
});

// Regression guards for #2496 / #2524 / #2477 — three "guard reports success
// while doing nothing" defects in codex/SKILL.md:
//   (a) the default `codex review` path set NO sandbox override, inheriting
//       whatever ~/.codex/config.toml grants (write access on trusted
//       projects) while the skill's Important Rules claimed read-only;
//   (b) the severity-tag verdict gate could not fail on the default path — a
//       non-zero exit, empty output, or untagged output all satisfied the
//       "no [P1] found → PASS" branch as written;
//   (c) Step 2A's Bash tool gate (300000 ms) sat BELOW the 330s wrapper
//       budget, so the harness killed the call before the wrapper could emit
//       its diagnosable exit-124 message — the same inversion #1036 fixed for
//       /review and /ship.
// The three mode bodies are carved into codex/sections/*-mode.md (T9), so the
// sweep reads the skeleton+sections UNION on both the .tmpl side and the
// generated side — a regen or hand-edit of one but not the other can't
// silently reopen any of them. Each mode section starts with its own `## `
// heading, so the per-`## `-section split in check (c) still isolates each
// mode's gate/wrapper pair.
function readCodexUnion(kind: 'tmpl' | 'rendered'): string {
  const sectionsDir = path.join(ROOT, 'codex', 'sections');
  const skeleton = fs.readFileSync(
    path.join(ROOT, 'codex', kind === 'tmpl' ? 'SKILL.md.tmpl' : 'SKILL.md'),
    'utf-8',
  );
  const suffix = kind === 'tmpl' ? '.md.tmpl' : '.md';
  const sections = fs.readdirSync(sectionsDir).sort()
    .filter((f) => (kind === 'tmpl' ? f.endsWith('.md.tmpl') : f.endsWith('.md') && !f.endsWith('.md.tmpl')))
    .map((f) => fs.readFileSync(path.join(sectionsDir, f), 'utf-8'));
  expect(sections.length, `codex sections (*${suffix}) missing`).toBeGreaterThanOrEqual(3);
  return [skeleton, ...sections].join('\n');
}

describe('codex skeleton+sections union: review sandbox + fail-closed gate + timeout ordering', () => {
  for (const relPath of ['codex tmpl union', 'codex rendered union'] as const) {
    const read = () => readCodexUnion(relPath === 'codex tmpl union' ? 'tmpl' : 'rendered');

    test(`${relPath}: (a) every scoped codex review invocation pins sandbox_mode="read-only"`, () => {
      const invocations = read()
        .split('\n')
        .filter((l) => /_gstack_codex_timeout_wrapper\s+\d+\s+codex\s+review\b/.test(l));
      expect(invocations.length).toBeGreaterThanOrEqual(1);
      for (const line of invocations) {
        expect(line).toContain('sandbox_mode="read-only"');
        // `codex review` has no -s/--sandbox flag (verified 0.147.0) — the
        // config override is the only lever. `-s read-only` here would fail
        // at argv parsing, which check (b) would then read as a gate FAIL.
        expect(line).not.toMatch(/\s-s\s+read-only\b/);
      }
    });

    test(`${relPath}: (b) the verdict gate fails closed — no default-PASS path`, () => {
      const content = read();
      // The old rule inferred PASS from the absence of a substring:
      expect(content).not.toContain(
        'If no `[P1]` markers are found (only `[P2]` or no findings) — the gate is **PASS**',
      );
      // The new rule: FAIL on non-zero exit, empty output, and untagged
      // output; [P0] recognized as blocking; PASS reachable only through the
      // explicit tagged-advisory-only branch.
      expect(content).toContain('The gate FAILS CLOSED');
      expect(content).toContain('`_CODEX_EXIT` is non-zero (including 124) → **GATE: FAIL**');
      expect(content).toContain('empty or whitespace-only → **GATE: FAIL**');
      expect(content).toContain('untagged output');
      expect(content).toContain('`[P0]`');
      expect(content).toContain('PASS is only reachable through check 5');
    });

    test(`${relPath}: (c) every Bash gate sits strictly above its section's wrapper budgets`, () => {
      // Split on `## ` headings; within any section that declares BOTH a Bash
      // tool gate (`timeout: N` in ms) and a wrapper budget
      // (`_gstack_codex_timeout_wrapper S codex`), every gate must be strictly
      // greater than every wrapper budget so the wrapper fires first.
      const sections = read().split(/\n## /);
      const inspected: string[] = [];
      for (const section of sections) {
        const gates = [...section.matchAll(/timeout:\s*(\d{4,})/g)].map((m) => Number(m[1]));
        const wrappers = [...section.matchAll(/_gstack_codex_timeout_wrapper\s+(\d+)\s+codex\b/g)].map(
          (m) => Number(m[1]) * 1000,
        );
        if (gates.length === 0 || wrappers.length === 0) continue;
        inspected.push(section.split('\n')[0]);
        for (const gate of gates) {
          for (const wrapper of wrappers) {
            expect(gate).toBeGreaterThan(wrapper);
          }
        }
      }
      // Review (2A), Challenge (2B), and Consult (2C) must all have been
      // inspected — each declares both numbers. If a refactor drops either
      // number from a section, this count catches the silent skip.
      expect(inspected.length).toBeGreaterThanOrEqual(3);
    });
  }
});

// #2742: a Codex CLI that is on PATH but cannot execute (spawn ENOENT, missing
// vendor payload, non-executable binary) used to land in the model probe's
// fail-open bucket and resolve to CODEX_MODE: ready — so every Codex pass was
// skipped in silence. These pin the classification, the exit-code contract, and
// the fact that the fail-open path still exists for genuine transients.
describe('codex broken-install detection (#2742)', () => {
  // A fake `codex` on PATH that reproduces the real failure: node's spawn dump
  // on stderr, non-zero exit. `mode` picks which failure shape to emit.
  function shimHome(mode: 'enoent' | 'notexec' | 'timeout' | 'model400' | 'oksuspicious') {
    const home = fs.mkdtempSync(path.join(os.tmpdir(), 'gstack-codex-shim-'));
    const bin = path.join(home, 'bin');
    fs.mkdirSync(bin, { recursive: true });
    // auth.json so the auth probe passes and we reach the model probe.
    fs.mkdirSync(path.join(home, '.codex'), { recursive: true });
    fs.writeFileSync(path.join(home, '.codex/auth.json'), '{}');
    const bodies: Record<string, string> = {
      enoent:
        `echo "Error: spawn /x/vendor/aarch64-apple-darwin/codex/codex ENOENT" >&2\n` +
        `echo "  errno: -2, code: 'ENOENT'" >&2\nexit 1\n`,
      notexec: `echo "bash: codex: cannot execute binary file" >&2\nexit 126\n`,
      timeout: `echo "network hiccup" >&2\nexit 124\n`,
      model400: `echo "The 'gpt-x' model is not supported when using Codex with a ChatGPT account" >&2\nexit 1\n`,
      oksuspicious: `echo "OK — note: the log you pasted mentions permission denied on /var/log"\nexit 0\n`,
    };
    fs.writeFileSync(path.join(bin, 'codex'), `#!/usr/bin/env bash\n${bodies[mode]}`, { mode: 0o755 });
    return { home, bin };
  }

  const cases: Array<[string, 'enoent' | 'notexec', string]> = [
    ['spawn ENOENT', 'enoent', 'ENOENT'],
    ['non-executable binary (exit 126)', 'notexec', 'cannot execute binary file'],
  ];

  for (const [label, mode, needle] of cases) {
    test(`${label} is classified as a broken install, not a transient`, () => {
      const { home, bin } = shimHome(mode);
      try {
        const r = runProbe({
          snippet: '_gstack_codex_model_probe; echo "EXIT:$?"',
          home,
          env: { PATH: `${bin}:${process.env.PATH ?? ''}`, GSTACK_HOME: home },
        });
        expect(r.stdout).toContain('MODEL_UNUSABLE_INSTALL');
        // Exit 2 is what lets the preflight tell this apart from a model 400.
        expect(r.stdout).toContain('EXIT:2');
        // It must NOT fail open — that was the whole defect.
        expect(r.stdout).not.toContain('MODEL_PROBE_INCONCLUSIVE');
        // The remedy names the install, not the model pin.
        expect(r.stdout).toContain('npm install -g @openai/codex');
        expect(r.stdout.toLowerCase()).toContain(needle.toLowerCase());
      } finally {
        fs.rmSync(home, { recursive: true, force: true });
      }
    });
  }

  test('a broken install is never cached — a reinstall is picked up next probe', () => {
    const { home, bin } = shimHome('enoent');
    try {
      runProbe({
        snippet: '_gstack_codex_model_probe >/dev/null 2>&1',
        home,
        env: { PATH: `${bin}:${process.env.PATH ?? ''}`, GSTACK_HOME: home },
      });
      const cache = path.join(home, '.codex-model-probe');
      if (fs.existsSync(cache)) {
        expect(fs.readFileSync(cache, 'utf8')).not.toContain('MODEL_OK');
      }
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('a genuine transient (exit 124) still fails open', () => {
    const { home, bin } = shimHome('timeout');
    try {
      const r = runProbe({
        snippet: '_gstack_codex_model_probe; echo "EXIT:$?"',
        home,
        env: { PATH: `${bin}:${process.env.PATH ?? ''}`, GSTACK_HOME: home },
      });
      expect(r.stdout).toContain('MODEL_PROBE_INCONCLUSIVE');
      expect(r.stdout).toContain('EXIT:0');
      expect(r.stdout).not.toContain('MODEL_UNUSABLE_INSTALL');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('the model 400 still classifies as MODEL_UNUSABLE, not a broken install', () => {
    const { home, bin } = shimHome('model400');
    try {
      const r = runProbe({
        snippet: '_gstack_codex_model_probe; echo "EXIT:$?"',
        home,
        env: { PATH: `${bin}:${process.env.PATH ?? ''}`, GSTACK_HOME: home },
      });
      expect(r.stdout).toContain('MODEL_UNUSABLE');
      expect(r.stdout).not.toContain('MODEL_UNUSABLE_INSTALL');
      expect(r.stdout).toContain('EXIT:1');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  test('version check warns instead of returning silently when codex cannot report a version', () => {
    const { home, bin } = shimHome('enoent');
    try {
      const r = runProbe({
        snippet: '_gstack_codex_version_check; echo "EXIT:$?"',
        home,
        env: { PATH: `${bin}:${process.env.PATH ?? ''}`, GSTACK_HOME: home },
      });
      // Previously this printed nothing: `codex --version 2>/dev/null | head -1`
      // captured head's status, so a CLI that only ever errored read as healthy.
      expect(r.stdout).toContain('WARN');
      expect(r.stdout).toContain('npm install -g @openai/codex');
      // Still non-fatal — the version check has never gated anything.
      expect(r.stdout).toContain('EXIT:0');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  // Wave-amended (#2745 absorption): string signatures only count on a FAILED
  // spawn — a SUCCESSFUL response whose text mentions "permission denied"
  // (e.g. the model quoting a log the user pasted) must stay healthy.
  test('exit-0 response mentioning "permission denied" is NOT a broken install', () => {
    const { home, bin } = shimHome('oksuspicious');
    try {
      const r = runProbe({
        snippet: '_gstack_codex_model_probe; echo "EXIT:$?"',
        home,
        env: { PATH: `${bin}:${process.env.PATH ?? ''}`, GSTACK_HOME: home },
      });
      expect(r.stdout).not.toContain('MODEL_UNUSABLE_INSTALL');
      expect(r.stdout).toContain('EXIT:0');
    } finally {
      fs.rmSync(home, { recursive: true, force: true });
    }
  });

  // Wave-amended (#2745 absorption): autoplan's preflight chain is the one
  // hand-maintained copy that isn't resolver-generated — it must capture the
  // probe's exit code and route 2 to its own broken-install arm, or /autoplan
  // prints the wrong remedy for a broken binary.
  test('autoplan preflight (tmpl + rendered) captures the probe exit and routes 2 to broken-install', () => {
    for (const rel of ['autoplan/SKILL.md.tmpl', 'autoplan/SKILL.md']) {
      const src = fs.readFileSync(path.join(ROOT, rel), 'utf-8');
      expect(src).toContain('_gstack_codex_model_probe; _CODEX_MP=$?');
      expect(src).toMatch(/_CODEX_MP" -eq 2/);
      expect(src).toContain('binary cannot run');
      expect(src).not.toContain('elif ! _gstack_codex_model_probe');
    }
  });

  test('the preflight resolver routes exit 2 to broken_install', () => {
    const src = fs.readFileSync(path.join(ROOT, 'scripts/resolvers/constants.ts'), 'utf8');
    expect(src).toContain('broken_install');
    // The chain must capture the probe's code; `elif ! _gstack_codex_model_probe`
    // collapses 1 and 2 into one branch and loses the distinction.
    expect(src).toContain('_CODEX_MP=$?');
  });
});