diff --git a/src/lib/ai/prompts/__tests__/safety-contracts-parity.test.ts b/src/lib/ai/prompts/__tests__/safety-contracts-parity.test.ts
new file mode 100644
index 000000000..c9a966e84
--- /dev/null
+++ b/src/lib/ai/prompts/__tests__/safety-contracts-parity.test.ts
@@ -0,0 +1,152 @@
+import { describe, it, expect } from "vitest";
+
+import {
+  GROUND_RULE_KEYS,
+  SAFETY_CONTRACT_LOCALES,
+  loadSafetyContracts,
+} from "../safety-contracts";
+
+/**
+ * v1.4.25 W14c — safety-contract matrix parity guards.
+ *
+ * Complements the W9d `i18n-locale-integrity.test.ts` for the YAML
+ * matrix:
+ *
+ *   1. Every EN ground rule has a non-empty translation in every other
+ *      locale. A missing translation is a translator gap that must
+ *      block release.
+ *   2. No non-EN locale carries a value identical to its EN counterpart
+ *      (verbatim-EN in a non-EN body = placeholder bug). Brand names
+ *      and contract enums are exempt — they're SUPPOSED to stay
+ *      EN-identical (rule 3 below).
+ *   3. Every sentinel literal is IDENTICAL across all six locales —
+ *      these are parser-contract markers, not translatable copy.
+ *   4. Every GLP-1 brand name appears IDENTICALLY across all six
+ *      locales — international brand registry, never translate.
+ *   5. Every JSON contract enum value (severity, sourceWindow, etc) is
+ *      IDENTICAL across all six locales — these are parser keys.
+ *   6. Every locale exports a non-empty `defer_to_clinician_phrases`
+ *      list (the refusal-probe needs at least one match per locale).
+ *   7. Every locale's `out_of_scope_refusal.summary` is non-empty.
+ *   8. The PROMPT_VERSION ratchet is not gated on this file — additive
+ *      ratchets (adding a new GROUND RULE) get a separate landing.
+ */
+
+describe("safety-contracts parity — every EN rule translated", () => {
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    for (const key of GROUND_RULE_KEYS) {
+      it(`${locale}/${key} has a non-empty body`, () => {
+        const matrix = loadSafetyContracts(locale);
+        const rule = matrix.ground_rules[key];
+        const body = locale === "en" ? rule.en : rule.locale;
+        expect(body, `${locale}/${key} body`).toBeDefined();
+        expect(body!.trim().length).toBeGreaterThan(0);
+      });
+    }
+  }
+});
+
+describe("safety-contracts parity — non-EN bodies are not verbatim-EN", () => {
+  // Brand names + contract enums + sentinel literals legitimately stay
+  // EN-identical inside each locale's rule body. Compare only the
+  // `locale` field of each non-EN rule against the `.en` field of the
+  // same rule and assert they differ. This catches the "translator
+  // forgot to fill in the row" placeholder bug.
+  const en = loadSafetyContracts("en");
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    if (locale === "en") continue;
+    for (const key of GROUND_RULE_KEYS) {
+      it(`${locale}/${key} is translated (not verbatim EN)`, () => {
+        const m = loadSafetyContracts(locale);
+        const enBody = en.ground_rules[key].en;
+        const localeBody = m.ground_rules[key].locale;
+        expect(enBody).toBeDefined();
+        expect(localeBody).toBeDefined();
+        expect(localeBody!.trim()).not.toBe(enBody!.trim());
+      });
+    }
+  }
+});
+
+describe("safety-contracts parity — sentinel literals identical across locales", () => {
+  const enSentinels = loadSafetyContracts("en").sentinel_literals;
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    if (locale === "en") continue;
+    it(`${locale} sentinel_literals match EN exactly`, () => {
+      const localeSentinels = loadSafetyContracts(locale).sentinel_literals;
+      expect(localeSentinels).toEqual(enSentinels);
+    });
+  }
+});
+
+describe("safety-contracts parity — GLP-1 brand list identical across locales", () => {
+  const enBrands = loadSafetyContracts("en").glp1_brand_list;
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    if (locale === "en") continue;
+    it(`${locale} glp1_brand_list matches EN exactly`, () => {
+      const localeBrands = loadSafetyContracts(locale).glp1_brand_list;
+      expect(localeBrands).toEqual(enBrands);
+    });
+  }
+});
+
+describe("safety-contracts parity — contract enums identical across locales", () => {
+  const enEnums = loadSafetyContracts("en").contract_enums;
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    if (locale === "en") continue;
+    it(`${locale} contract_enums match EN exactly`, () => {
+      const localeEnums = loadSafetyContracts(locale).contract_enums;
+      expect(localeEnums).toEqual(enEnums);
+    });
+  }
+});
+
+describe("safety-contracts parity — defer-to-clinician phrase list non-empty", () => {
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    it(`${locale} defer_to_clinician_phrases has at least one entry`, () => {
+      const phrases = loadSafetyContracts(locale).defer_to_clinician_phrases;
+      expect(phrases.length).toBeGreaterThan(0);
+      for (const phrase of phrases) {
+        expect(phrase.trim().length).toBeGreaterThan(0);
+      }
+    });
+  }
+});
+
+describe("safety-contracts parity — out-of-scope refusal summary non-empty", () => {
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    it(`${locale} out_of_scope_refusal.summary is non-empty`, () => {
+      const summary = loadSafetyContracts(locale).out_of_scope_refusal.summary;
+      expect(summary.trim().length).toBeGreaterThan(0);
+    });
+  }
+});
+
+describe("safety-contracts parity — every parser_critical rule must_contain tokens survive", () => {
+  // The refusal-probe test asserts each rule body carries its
+  // `must_contain` tokens, but only via the locale-specific body in
+  // that file. Here we additionally guarantee that for every locale's
+  // matrix the parser-critical rules expose at least one token in
+  // `must_contain` (a defence-in-depth check — a rule that loses its
+  // must_contain pin would silently bypass the refusal-probe).
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    const matrix = loadSafetyContracts(locale);
+    for (const key of GROUND_RULE_KEYS) {
+      const rule = matrix.ground_rules[key];
+      if (!rule.parser_critical) continue;
+      it(`${locale}/${key} (parser_critical) declares must_contain tokens`, () => {
+        expect(rule.must_contain).toBeDefined();
+        expect((rule.must_contain ?? []).length).toBeGreaterThan(0);
+      });
+    }
+  }
+});
+
+describe("safety-contracts parity — reply-language directive non-empty", () => {
+  for (const locale of SAFETY_CONTRACT_LOCALES) {
+    it(`${locale} reply_language_directive is non-empty`, () => {
+      const directive = loadSafetyContracts(locale).reply_language_directive;
+      expect(directive.trim().length).toBeGreaterThan(10);
+    });
+  }
+});
diff --git a/src/lib/ai/prompts/safety-contracts.de.yaml b/src/lib/ai/prompts/safety-contracts.de.yaml
index 5bf1a2402..623963ae3 100644
--- a/src/lib/ai/prompts/safety-contracts.de.yaml
+++ b/src/lib/ai/prompts/safety-contracts.de.yaml
@@ -173,6 +173,11 @@ ground_rules:
       sourceWindow ("7d" | "30d" | "90d" | "1y") und ein sourceMetric.
       Findings MÜSSEN aus Zahlen im Snapshot abgeleitet sein. Fünf ist
       die harte Obergrenze.
+    must_contain:
+      - "dailyBriefing"
+      - "keyFindings"
+      - "sourceWindow"
+      - "sourceMetric"
 
   ground_rule_14_apple_health_silent_absence:
     parser_critical: false
diff --git a/src/lib/ai/prompts/safety-contracts.en.yaml b/src/lib/ai/prompts/safety-contracts.en.yaml
index 4502cc275..ab95f1212 100644
--- a/src/lib/ai/prompts/safety-contracts.en.yaml
+++ b/src/lib/ai/prompts/safety-contracts.en.yaml
@@ -226,6 +226,11 @@ ground_rules:
       one-sentence detail, an optional delta, a sourceWindow
       ("7d" | "30d" | "90d" | "1y") and a sourceMetric. Findings MUST
       be derived from snapshot numbers. Five is the hard cap.
+    must_contain:
+      - "dailyBriefing"
+      - "keyFindings"
+      - "sourceWindow"
+      - "sourceMetric"
 
   ground_rule_14_apple_health_silent_absence:
     parser_critical: false
diff --git a/src/lib/ai/prompts/safety-contracts.es.yaml b/src/lib/ai/prompts/safety-contracts.es.yaml
index 1d8f9d7a6..6df178dc3 100644
--- a/src/lib/ai/prompts/safety-contracts.es.yaml
+++ b/src/lib/ai/prompts/safety-contracts.es.yaml
@@ -174,6 +174,11 @@ ground_rules:
       de una sola frase, un delta opcional, un sourceWindow ("7d" |
       "30d" | "90d" | "1y") y un sourceMetric. Los findings DEBEN
       derivarse de números del snapshot. Cinco es el límite estricto.
+    must_contain:
+      - "dailyBriefing"
+      - "keyFindings"
+      - "sourceWindow"
+      - "sourceMetric"
 
   ground_rule_14_apple_health_silent_absence:
     parser_critical: false
diff --git a/src/lib/ai/prompts/safety-contracts.fr.yaml b/src/lib/ai/prompts/safety-contracts.fr.yaml
index 009a6436a..70933425a 100644
--- a/src/lib/ai/prompts/safety-contracts.fr.yaml
+++ b/src/lib/ai/prompts/safety-contracts.fr.yaml
@@ -177,6 +177,11 @@ ground_rules:
       une phrase, un delta optionnel, un sourceWindow ("7d" | "30d" |
       "90d" | "1y") et un sourceMetric. Les findings DOIVENT être
       dérivés des nombres du snapshot. Cinq est le plafond strict.
+    must_contain:
+      - "dailyBriefing"
+      - "keyFindings"
+      - "sourceWindow"
+      - "sourceMetric"
 
   ground_rule_14_apple_health_silent_absence:
     parser_critical: false
diff --git a/src/lib/ai/prompts/safety-contracts.it.yaml b/src/lib/ai/prompts/safety-contracts.it.yaml
index 5501f63ef..51fdd34a9 100644
--- a/src/lib/ai/prompts/safety-contracts.it.yaml
+++ b/src/lib/ai/prompts/safety-contracts.it.yaml
@@ -178,6 +178,11 @@ ground_rules:
       una sola frase, un delta opzionale, un sourceWindow ("7d" |
       "30d" | "90d" | "1y") e un sourceMetric. I findings DEVONO
       derivare da numeri dello snapshot. Cinque è il limite rigido.
+    must_contain:
+      - "dailyBriefing"
+      - "keyFindings"
+      - "sourceWindow"
+      - "sourceMetric"
 
   ground_rule_14_apple_health_silent_absence:
     parser_critical: false
diff --git a/src/lib/ai/prompts/safety-contracts.pl.yaml b/src/lib/ai/prompts/safety-contracts.pl.yaml
index 671822a56..787382d06 100644
--- a/src/lib/ai/prompts/safety-contracts.pl.yaml
+++ b/src/lib/ai/prompts/safety-contracts.pl.yaml
@@ -180,6 +180,11 @@ ground_rules:
       detail, opcjonalny delta-string, sourceWindow ("7d" | "30d" |
       "90d" | "1y") i sourceMetric. Findings MUSZĄ być wyprowadzone
       z liczb w snapshocie. Pięć to twarda górna granica.
+    must_contain:
+      - "dailyBriefing"
+      - "keyFindings"
+      - "sourceWindow"
+      - "sourceMetric"
 
   ground_rule_14_apple_health_silent_absence:
     parser_critical: false