diff --git a/.env.example b/.env.example
index 627883a..4e9cb93 100644
--- a/.env.example
+++ b/.env.example
@@ -47,3 +47,13 @@ OLLAMA_BASE_URL=
 # Create a bot via @BotFather, get chat ID via @userinfobot
 TELEGRAM_BOT_TOKEN=
 TELEGRAM_CHAT_ID=
+
+# === Aegis Content-Safety Sidecar (optional) ===
+# URL of the Aegis sidecar HTTP service
+AEGIS_SIDECAR_URL=http://localhost:8080
+# Bearer token for the sidecar API
+AEGIS_BEARER_TOKEN=local-dev-key
+# Set to "true" to fail closed (block) when the sidecar is unreachable
+AEGIS_STRICT_MODE=false
+# Timeout in milliseconds for sidecar requests
+AEGIS_TIMEOUT_MS=3000
diff --git a/feat/aegis-sdk-integration b/feat/aegis-sdk-integration
new file mode 100644
index 0000000..36bf221
--- /dev/null
+++ b/feat/aegis-sdk-integration
@@ -0,0 +1,15 @@
+# Drop files into their correct locations:
+cp aegis-adapter.mjs     sdk/aegis-adapter.mjs
+cp CLAUDE.md             CLAUDE.md
+cp adapter.test.mjs      tests/aegis/adapter.test.mjs
+cp aegis-health.mjs      scripts/aegis-health.mjs
+cp crucix-ci.yml         .github/workflows/crucix-ci.yml
+cp package.json          package.json
+cp .env.example          .env.example
+
+mkdir -p .claude/skills docs/agent-guides
+cp aegis-sdk.md          .claude/skills/aegis-sdk.md
+cp build-test-verify.md  .claude/skills/build-test-verify.md
+cp git-commit.md         .claude/skills/git-commit.md
+cp architecture.md       docs/agent-guides/architecture.md
+cp aegis-sdk-guide.md    docs/agent-guides/aegis-sdk-guide.md
\ No newline at end of file
diff --git a/sdk/aegis-adapter.mjs b/sdk/aegis-adapter.mjs
new file mode 100644
index 0000000..f123987
--- /dev/null
+++ b/sdk/aegis-adapter.mjs
@@ -0,0 +1,132 @@
+/**
+ * sdk/aegis-adapter.mjs
+ * Ethos Aegis integration layer for Crucix.
+ * Uses the native Node.js AegisClient for robust subprocess/HTTP management.
+ */
+
+import { AegisClient } from './ethos-aegis/sdk/node/src/index.js';
+
+// ─── Config ───────────────────────────────────────────────────────────────────
+
+const SIDECAR_URL = process.env.AEGIS_SIDECAR_URL || 'http://localhost:8080';
+const BEARER_TOKEN = process.env.AEGIS_BEARER_TOKEN || 'local-dev-key';
+const STRICT_MODE = process.env.AEGIS_STRICT_MODE === 'true';
+
+// Initialize the real AegisClient
+const aegis = new AegisClient({
+  baseUrl: SIDECAR_URL,
+  apiKey: BEARER_TOKEN,
+  throwOnCondemned: false, // We handle the escalation manually in Crucix
+  timeoutMs: parseInt(process.env.AEGIS_TIMEOUT_MS || '3000', 10)
+});
+
+// ─── Severity → Crucix tier mapping ──────────────────────────────────────────
+
+/**
+ * Maps an Aegis depth to a Crucix alert tier.
+ * @param {string} depth 
+ * @returns {'FLASH'|'PRIORITY'|'ROUTINE'|'PASS'}
+ */
+export function depthToTier(depth) {
+  switch (depth?.toUpperCase()) {
+    case 'CONDEMNED': return 'FLASH';
+    case 'GRAVE':     return 'PRIORITY';
+    case 'CAUTION':   return 'ROUTINE';
+    case 'TRACE':     return 'ROUTINE';
+    case 'VOID':
+    default:          return 'PASS';
+  }
+}
+
+// ─── Guard Functions ─────────────────────────────────────────────────────────
+
+export async function guardInput(rawText, context = {}) {
+  try {
+    const verdict = await aegis.adjudicate(rawText, { guardPoint: 'input', ...context });
+    return {
+      sanctified: verdict.sanctified,
+      payload: verdict.sanitized || rawText, // Fallback to raw if not sanitized
+      verdict
+    };
+  } catch (err) {
+    if (STRICT_MODE) throw new Error(`[Aegis] Strict mode active. Blocked due to sidecar failure: ${err.message}`);
+    console.warn(`[Aegis] Warning: Sidecar unreachable. Failing open. (${err.message})`);
+    return { sanctified: true, payload: rawText, verdict: _syntheticPass() };
+  }
+}
+
+export async function guardOutput(llmResponse, context = {}) {
+  try {
+    const verdict = await aegis.adjudicate(llmResponse, { guardPoint: 'output', ...context });
+    return {
+      sanctified: verdict.sanctified,
+      payload: verdict.sanitized || llmResponse,
+      verdict
+    };
+  } catch (err) {
+    if (STRICT_MODE) throw new Error(`[Aegis] Output guard failed: ${err.message}`);
+    return { sanctified: true, payload: llmResponse, verdict: _syntheticPass() };
+  }
+}
+
+export async function guardBotCommand(commandText, userId) {
+  try {
+    const verdict = await aegis.adjudicate(commandText, { guardPoint: 'bot_command', userId });
+    return {
+      sanctified: verdict.sanctified,
+      payload: verdict.sanitized || commandText,
+      verdict
+    };
+  } catch (err) {
+    if (STRICT_MODE) throw new Error(`[Aegis] Bot command guard failed: ${err.message}`);
+    return { sanctified: true, payload: commandText, verdict: _syntheticPass() };
+  }
+}
+
+export async function evaluateSignal(signal) {
+  if (!signal?.content) {
+    return {
+      signal,
+      tier: null,
+      blocked: false,
+      verdict: _syntheticPass(),
+    };
+  }
+
+  const { sanctified, payload, verdict } = await guardInput(signal.content, {
+    source: signal.source,
+    feedId: signal.id
+  });
+
+  const tier = depthToTier(verdict.depth);
+
+  if (!sanctified && verdict.condemned) {
+    console.error(`[Aegis] CONDEMNED Signal Blocked. RequestID: ${verdict.requestId}`);
+    return {
+      signal: { ...signal, content: '[CONTENT REDACTED BY AEGIS]' },
+      tier: 'FLASH',
+      blocked: true,
+      verdict,
+    };
+  }
+
+  return {
+    signal: { ...signal, content: payload ?? signal.content },
+    tier: tier === 'PASS' ? null : tier, 
+    blocked: false,
+    verdict,
+  };
+}
+
+function _syntheticPass() {
+  return {
+    sanctified: true,
+    condemned: false,
+    depth: 'VOID',
+    malignaCount: 0,
+    sanitized: null,
+    report: 'Synthetic pass (sidecar offline)',
+    latencyMs: 0,
+    requestId: `synth-${Date.now()}`
+  };
+}