diff --git a/.husky/pre-commit b/.husky/pre-commit
index 1bfbc29d10..f23acbf847 100755
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -12,6 +12,9 @@ npm run check:any-budget:t11
 # Strict env-doc sync (FASE 2)
 node scripts/check/check-env-doc-sync.mjs
 
+# CLI i18n consistency check — all t() keys must exist in en.json (FASE 8.3)
+node scripts/check/check-cli-i18n.mjs
+
 # i18n docs drift advisory (FASE 5) — warn-only on pre-commit; CI enforces strict.
 node scripts/i18n/check-translation-drift.mjs --warn || \
   echo "⚠️  i18n drift detected. Run 'npm run i18n:run' to update locale mirrors."
diff --git a/bin/cli/locales/en.json b/bin/cli/locales/en.json
index c572218e2a..41791e8ce6 100644
--- a/bin/cli/locales/en.json
+++ b/bin/cli/locales/en.json
@@ -192,6 +192,8 @@
     "confirmRestore": "Overwrite current data with backup from {ts}?"
   },
   "health": {
+    "description": "Check server health and component status",
+    "noServer": "Server not running. Start with: omniroute serve",
     "title": "Health",
     "status": "Status: {status}",
     "uptime": "Uptime: {uptime}",
diff --git a/bin/cli/locales/pt-BR.json b/bin/cli/locales/pt-BR.json
index 7a9adc8fa4..352b1bb20b 100644
--- a/bin/cli/locales/pt-BR.json
+++ b/bin/cli/locales/pt-BR.json
@@ -192,6 +192,8 @@
     "confirmRestore": "Substituir dados atuais pelo backup de {ts}?"
   },
   "health": {
+    "description": "Verificar saúde do servidor e status dos componentes",
+    "noServer": "Servidor não está em execução. Inicie com: omniroute serve",
     "title": "Saúde",
     "status": "Status: {status}",
     "uptime": "Uptime: {uptime}",
diff --git a/scripts/check/check-cli-i18n.mjs b/scripts/check/check-cli-i18n.mjs
new file mode 100644
index 0000000000..3503adb197
--- /dev/null
+++ b/scripts/check/check-cli-i18n.mjs
@@ -0,0 +1,103 @@
+#!/usr/bin/env node
+/**
+ * Validates that:
+ *   1. All t("key") calls in bin/cli/commands/ resolve to existing keys in en.json.
+ *   2. pt-BR.json has the same top-level shape as en.json (no missing top-level sections).
+ *   3. No raw string literals are passed to .description() in commands without going
+ *      through t() — only warns, does not fail hard (many descriptions use || fallback).
+ */
+import { readFileSync, readdirSync, statSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const ROOT = join(__dirname, "..", "..");
+const COMMANDS_DIR = join(ROOT, "bin", "cli", "commands");
+const LOCALES_DIR = join(ROOT, "bin", "cli", "locales");
+
+// Paths that look like t() keys but are actually import paths — skip them.
+const IGNORE_AS_KEY = new Set([".", ".."]);
+const IMPORT_PATH_RE = /^(\.\.?\/|node:|\/)/;
+
+function walk(dir) {
+  const results = [];
+  for (const entry of readdirSync(dir)) {
+    const full = join(dir, entry);
+    if (statSync(full).isDirectory()) {
+      results.push(...walk(full));
+    } else if (entry.endsWith(".mjs") || entry.endsWith(".js")) {
+      results.push(full);
+    }
+  }
+  return results;
+}
+
+function flattenKeys(obj, prefix = "") {
+  const keys = new Set();
+  for (const [k, v] of Object.entries(obj)) {
+    const full = prefix ? `${prefix}.${k}` : k;
+    if (v !== null && typeof v === "object" && !Array.isArray(v)) {
+      for (const sub of flattenKeys(v, full)) keys.add(sub);
+    } else {
+      keys.add(full);
+    }
+  }
+  return keys;
+}
+
+function collectTKeys(files) {
+  const used = new Set();
+  const re = /\bt\(\s*["']([^"']+)["']/g;
+  for (const file of files) {
+    const src = readFileSync(file, "utf8");
+    let m;
+    re.lastIndex = 0;
+    while ((m = re.exec(src)) !== null) {
+      const key = m[1];
+      if (IGNORE_AS_KEY.has(key) || IMPORT_PATH_RE.test(key)) continue;
+      used.add(key);
+    }
+  }
+  return used;
+}
+
+function loadJson(file) {
+  return JSON.parse(readFileSync(file, "utf8"));
+}
+
+const files = walk(COMMANDS_DIR);
+const usedKeys = collectTKeys(files);
+const en = loadJson(join(LOCALES_DIR, "en.json"));
+const ptBR = loadJson(join(LOCALES_DIR, "pt-BR.json"));
+const enKeys = flattenKeys(en);
+
+let errors = 0;
+
+// Check 1: all used keys exist in en.json
+const missingInEn = [...usedKeys].filter((k) => !enKeys.has(k));
+if (missingInEn.length > 0) {
+  console.error("[cli-i18n] Keys used in commands but missing in en.json:");
+  for (const k of missingInEn) console.error(`  ✗ ${k}`);
+  errors += missingInEn.length;
+} else {
+  console.log(`[cli-i18n] ✓ All ${usedKeys.size} t() keys found in en.json`);
+}
+
+// Check 2: pt-BR.json has the same top-level sections as en.json
+const enTopLevel = Object.keys(en);
+const ptTopLevel = new Set(Object.keys(ptBR));
+const missingTopLevel = enTopLevel.filter((k) => !ptTopLevel.has(k));
+if (missingTopLevel.length > 0) {
+  console.error("[cli-i18n] Top-level sections in en.json missing from pt-BR.json:");
+  for (const k of missingTopLevel) console.error(`  ✗ ${k}`);
+  errors += missingTopLevel.length;
+} else {
+  console.log(`[cli-i18n] ✓ pt-BR.json has all ${enTopLevel.length} top-level sections`);
+}
+
+if (errors > 0) {
+  console.error(`[cli-i18n] FAIL — ${errors} error(s) found`);
+  process.exit(1);
+} else {
+  console.log("[cli-i18n] PASS — CLI i18n is consistent");
+}
diff --git a/tests/unit/cli-i18n-catalog.test.ts b/tests/unit/cli-i18n-catalog.test.ts
new file mode 100644
index 0000000000..2bd987dbe1
--- /dev/null
+++ b/tests/unit/cli-i18n-catalog.test.ts
@@ -0,0 +1,124 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { createRequire } from "node:module";
+import { readFileSync, readdirSync, statSync } from "node:fs";
+import { join, dirname } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const ROOT = join(__dirname, "..", "..");
+const require = createRequire(import.meta.url);
+const en = require("../../bin/cli/locales/en.json");
+const ptBR = require("../../bin/cli/locales/pt-BR.json");
+
+function flattenKeys(obj: Record<string, unknown>, prefix = ""): Set<string> {
+  const keys = new Set<string>();
+  for (const [k, v] of Object.entries(obj)) {
+    const full = prefix ? `${prefix}.${k}` : k;
+    if (v !== null && typeof v === "object" && !Array.isArray(v)) {
+      for (const sub of flattenKeys(v as Record<string, unknown>, full)) keys.add(sub);
+    } else {
+      keys.add(full);
+    }
+  }
+  return keys;
+}
+
+function walkMjs(dir: string): string[] {
+  const results: string[] = [];
+  for (const entry of readdirSync(dir)) {
+    const full = join(dir, entry);
+    if (statSync(full).isDirectory()) {
+      results.push(...walkMjs(full));
+    } else if (entry.endsWith(".mjs") || entry.endsWith(".js")) {
+      results.push(full);
+    }
+  }
+  return results;
+}
+
+const IMPORT_PATH_RE = /^(\.\.?\/|node:|\/)/;
+const IGNORE_AS_KEY = new Set([".", ".."]);
+
+function collectTKeys(files: string[]): Set<string> {
+  const used = new Set<string>();
+  const re = /\bt\(\s*["']([^"']+)["']/g;
+  for (const file of files) {
+    const src = readFileSync(file, "utf8");
+    re.lastIndex = 0;
+    let m;
+    while ((m = re.exec(src)) !== null) {
+      const key = m[1];
+      if (IGNORE_AS_KEY.has(key) || IMPORT_PATH_RE.test(key)) continue;
+      used.add(key);
+    }
+  }
+  return used;
+}
+
+const commandFiles = walkMjs(join(ROOT, "bin", "cli", "commands"));
+const usedKeys = collectTKeys(commandFiles);
+const enKeys = flattenKeys(en as Record<string, unknown>);
+
+test("en.json contém todas as chaves usadas via t() nos comandos", () => {
+  const missing = [...usedKeys].filter((k) => !enKeys.has(k));
+  assert.deepEqual(missing, [], `Chaves faltando em en.json: ${missing.join(", ")}`);
+});
+
+test("pt-BR.json tem todas as seções top-level de en.json", () => {
+  const enTop = Object.keys(en as object);
+  const ptTop = new Set(Object.keys(ptBR as object));
+  const missing = enTop.filter((k) => !ptTop.has(k));
+  assert.deepEqual(missing, [], `Seções top-level faltando em pt-BR.json: ${missing.join(", ")}`);
+});
+
+test("i18n.mjs detecta locale por OMNIROUTE_LANG", async () => {
+  const { resetForTests, detectLocale } = await import("../../bin/cli/i18n.mjs");
+  const orig = process.env.OMNIROUTE_LANG;
+  process.env.OMNIROUTE_LANG = "pt-BR";
+  resetForTests();
+  const locale = detectLocale();
+  assert.equal(locale, "pt-BR");
+  if (orig === undefined) delete process.env.OMNIROUTE_LANG;
+  else process.env.OMNIROUTE_LANG = orig;
+  resetForTests();
+});
+
+test("i18n.mjs usa fallback en quando locale não existe", async () => {
+  const { resetForTests, detectLocale } = await import("../../bin/cli/i18n.mjs");
+  const orig = process.env.OMNIROUTE_LANG;
+  process.env.OMNIROUTE_LANG = "xx-FAKE";
+  resetForTests();
+  const locale = detectLocale();
+  assert.equal(locale, "en");
+  if (orig === undefined) delete process.env.OMNIROUTE_LANG;
+  else process.env.OMNIROUTE_LANG = orig;
+  resetForTests();
+});
+
+test("t() interpola variáveis {var}", async () => {
+  const { resetForTests, t, setLocale } = await import("../../bin/cli/i18n.mjs");
+  resetForTests();
+  setLocale("en");
+  const result = t("health.status", { status: "OK" });
+  assert.equal(result, "Status: OK");
+  resetForTests();
+});
+
+test("t() retorna a chave quando não existe no catálogo", async () => {
+  const { resetForTests, t, setLocale } = await import("../../bin/cli/i18n.mjs");
+  resetForTests();
+  setLocale("en");
+  const result = t("does.not.exist.at.all");
+  assert.equal(result, "does.not.exist.at.all");
+  resetForTests();
+});
+
+test("t() usa pt-BR quando disponível", async () => {
+  const { resetForTests, t, setLocale } = await import("../../bin/cli/i18n.mjs");
+  resetForTests();
+  setLocale("pt-BR");
+  const result = t("health.noServer");
+  assert.ok(result.includes("omniroute serve"), `Esperava mensagem pt-BR, obteve: ${result}`);
+  resetForTests();
+});