diff --git a/lib/review-risk.ts b/lib/review-risk.ts
index 522f6fcb3..5535a4243 100644
--- a/lib/review-risk.ts
+++ b/lib/review-risk.ts
@@ -51,7 +51,8 @@ export const SECRET_LINE = [
   /\b(?:keychain|keytar|find-generic-password|find-internet-password|secret-tool|git-credential|credential\.helper)\b/i, /\bgh auth token\b/, /(?:^|[\s'"/])\.netrc\b/,
 ];
 
-const SECURITY_PATH_TOKENS = ['trust', 'redact', 'redaction', 'redactor', 'sanitize', 'sanitizer', 'neutralize', 'neutralizer', 'consent', 'escape'];
+/** Sealed custody (harness-evals#237: scripts/sealed/seal.ts) and egress code are trust boundaries too (GST-1177). */
+const SECURITY_PATH_TOKENS = ['trust', 'redact', 'redaction', 'redactor', 'sanitize', 'sanitizer', 'neutralize', 'neutralizer', 'consent', 'escape', 'seal', 'sealed', 'custody', 'egress'];
 /** Coarse, linear-time rules (GST-850 B+): any changed line naming the child_process module, any outbound HTTP client call; quantifiers bounded. */
 export const SECURITY_LINE = [
   /\bshell\s*:\s*true\b/, /\bshell\s*=\s*True\b/, /(?<![.\w$])exec(?:Sync)?\s*\(/, /\b(?:child_process|childProcess|cp)\.exec(?:Sync)?\s*\(/, /\bos\.system\s*\(/,
@@ -67,6 +68,7 @@ export const SECURITY_LINE = [
   /(?<![.\w])eval\s*\(/, /(?:^|[;&|])\s*eval\s+["'$]/, /\bnew\s+Function\s*\(/,
   /\b(?:spawn|spawnSync|execFile|execFileSync)\s*\(\s*['"](?:\/bin\/)?(?:ba|z)?sh['"]/, /\bBun\.spawn(?:Sync)?\s*\(\s*\[\s*['"](?:\/bin\/)?(?:ba|z)?sh['"]/,
   /\brmSync\s*\((?:.{0,500}?recursive\s*:\s*true|[^)]{501})/, /\brm\s*\((?:.{0,500}?recursive\s*:\s*true|[^)]{501})/, /\brm\s+-(?=[a-z]*r)(?=[a-z]*f)[a-z]*[rf]\b/,
+  /\bredact[A-Za-z]{0,40}\s{0,20}\(/, /(?:\bfrom\s{1,20}|\b(?:require|import)\s{0,20}\(\s{0,20})['"][^'"]{0,300}(?:redact|outside-voice)[^'"]{0,300}['"]/, /\b[A-Z0-9_]{0,60}(?:SECRET|CREDENTIAL)[A-Z0-9_]{0,60}\s{0,20}=\s{0,20}\//,
   /\b(?:innerHTML|outerHTML)\s*\+?=/, /\bdangerouslySetInnerHTML\b/, /\bv-html\b/, /\{@html\b/, /\binsertAdjacentHTML\s*\(/, /\bdocument\.write\s*\(/,
 ];
 /** A recursive delete split across lines (a formatter puts `recursive: true` on its own line), read over a file's changed lines joined. */
diff --git a/test/review-depth-lean.test.ts b/test/review-depth-lean.test.ts
index 2859f6738..9badbbe60 100644
--- a/test/review-depth-lean.test.ts
+++ b/test/review-depth-lean.test.ts
@@ -38,6 +38,20 @@ describe('HARN-1 false triggers (harness-evals#231 on 1.93.7.0): data, config an
     for (const p of exe) expect(classifyDiff({ paths: [p], gateTagged: 0, executables: [p] }).class).toBe('code');
     expect(classifyDiff({ paths: ['logs/run.txt', 'docs/r/logs/ready'], gateTagged: 0, executables: [] }).class).toBe('docs');
   });
+  // Value: protects=sealed custody and outside-model prompt egress plan full depth (GST-1177: harness-evals#237, gstack #3921);
+  //   fails_when=scripts/sealed/seal.ts or the #3921 secret-egress lines class light with no risk; seam=matchRisk path and line rules
+  test('sealed custody and code that redacts or ships repo content to an outside model are security', () => {
+    const sec = (p: string, lines: string[] = ['export const x = 1;']) => matchRisk({ codePaths: [p], added: { [p]: lines }, scopeAuth: false }).has('security');
+    expect(sec('scripts/sealed/seal.ts')).toBe(true);
+    expect(sec('lib/eval-custody.ts')).toBe(true);
+    expect(sec('lib/autoplan-lean.ts', ["import { redactFindingSpans } from './redact-engine';"])).toBe(true);
+    expect(sec('lib/autoplan-lean.ts', ['  const redacted = (patch: string) => redactFindingSpans(patch) ?? "";'])).toBe(true);
+    expect(sec('lib/autoplan-lean.ts', ['const SECRET_NAME = /(^|\\/)(\\.env[^/]*)$/i;'])).toBe(true);
+    expect(sec('lib/review-x.ts', ["import { runOutsideVoice } from './outside-voice-runner';"])).toBe(true);
+    expect(sec('lib/autoplan-lean.ts', ['const INLINE_DRAFT_BYTES = 64_000;'])).toBe(false);
+    expect(sec('lib/seasonal.ts')).toBe(false);
+    expect(classifyDiff({ paths: ['scripts/sealed/seal.ts'], gateTagged: 0 }).risk).toContain('security');
+  });
   test('a sqlite file is data even when a script names it', () => {
     const c = classifyDiff({ paths: [sqlite, 'scripts/load.py'], gateTagged: 0, perPath: [{ path: sqlite, lines: 0, binary: true }, { path: 'scripts/load.py', lines: 4, binary: false }], consumed: [sqlite] });
     expect([c.class, c.errors.map(e => e.code), c.runtimeLines]).toEqual(['code', [], 4]);