diff --git a/open-sse/handlers/chatCore.ts b/open-sse/handlers/chatCore.ts
index 5d0c502cf4..de4b63a1e1 100644
--- a/open-sse/handlers/chatCore.ts
+++ b/open-sse/handlers/chatCore.ts
@@ -165,6 +165,7 @@ import {
   restoreClaudePassthroughToolNames,
   mergeResponseToolNameMap,
 } from "./chatCore/passthroughToolNames.ts";
+import { recordContextEditingTelemetryHook } from "./chatCore/contextEditingTelemetry.ts";
 import {
   appendNonStreamingSseTerminalSignal,
   type NonStreamingSseTerminalState,
@@ -3540,25 +3541,13 @@ export async function handleChatCore({
     // Context Editing telemetry: when the delegated server-side clear actually ran,
     // record the provider's cleared-token receipt under engine "context-editing" so
     // it surfaces in compression analytics. Best-effort, Claude-only, non-streaming.
-    if (contextEditingEnabled && provider === "claude") {
-      void (async () => {
-        try {
-          const { extractContextEditingTelemetry } = await import("../config/contextEditing.ts");
-          const tele = extractContextEditingTelemetry(responseBody);
-          if (tele) {
-            const { recordContextEditingTelemetry } =
-              await import("../../src/lib/db/compressionAnalytics.ts");
-            recordContextEditingTelemetry(skillRequestId, tele, provider);
-            log?.debug?.(
-              "CONTEXT_EDITING",
-              `cleared ${tele.clearedInputTokens} input tokens / ${tele.clearedToolUses} tool uses (${tele.editCount} edits)`
-            );
-          }
-        } catch {
-          // Telemetry is best-effort and must never affect the response.
-        }
-      })();
-    }
+    recordContextEditingTelemetryHook({
+      contextEditingEnabled,
+      provider,
+      responseBody,
+      skillRequestId,
+      log,
+    });
     appendRequestLog({ model, provider, connectionId, tokens: usage, status: "200 OK" }).catch(
       () => {}
     );
diff --git a/open-sse/handlers/chatCore/contextEditingTelemetry.ts b/open-sse/handlers/chatCore/contextEditingTelemetry.ts
new file mode 100644
index 0000000000..abe1c7bde2
--- /dev/null
+++ b/open-sse/handlers/chatCore/contextEditingTelemetry.ts
@@ -0,0 +1,40 @@
+/**
+ * chatCore context-editing telemetry hook (Quality Gate v2 / Fase 9 — chatCore god-file
+ * decomposition, #3501).
+ *
+ * Extracted from handleChatCore's non-streaming success path: when the delegated server-side
+ * context-clear actually ran (Claude-only), record the provider's cleared-token receipt under the
+ * "context-editing" engine so it surfaces in compression analytics. Best-effort, fire-and-forget,
+ * and must never affect the response — the inner work is an un-awaited IIFE that swallows its own
+ * errors. Behaviour is byte-identical to the previous inline block.
+ */
+
+type LoggerLike = { debug?: (...args: unknown[]) => void } | null | undefined;
+
+export function recordContextEditingTelemetryHook(args: {
+  contextEditingEnabled: boolean;
+  provider: string | null | undefined;
+  responseBody: unknown;
+  skillRequestId: string;
+  log?: LoggerLike;
+}): void {
+  const { contextEditingEnabled, provider, responseBody, skillRequestId, log } = args;
+  if (!contextEditingEnabled || provider !== "claude") return;
+
+  void (async () => {
+    try {
+      const { extractContextEditingTelemetry } = await import("../../config/contextEditing.ts");
+      const tele = extractContextEditingTelemetry(responseBody);
+      if (tele) {
+        const { recordContextEditingTelemetry } = await import("@/lib/db/compressionAnalytics");
+        recordContextEditingTelemetry(skillRequestId, tele, provider);
+        log?.debug?.(
+          "CONTEXT_EDITING",
+          `cleared ${tele.clearedInputTokens} input tokens / ${tele.clearedToolUses} tool uses (${tele.editCount} edits)`
+        );
+      }
+    } catch {
+      // Telemetry is best-effort and must never affect the response.
+    }
+  })();
+}
diff --git a/tests/unit/chatcore-context-editing-telemetry.test.ts b/tests/unit/chatcore-context-editing-telemetry.test.ts
new file mode 100644
index 0000000000..bfb6cad524
--- /dev/null
+++ b/tests/unit/chatcore-context-editing-telemetry.test.ts
@@ -0,0 +1,106 @@
+// Characterization of recordContextEditingTelemetryHook — the Claude-only context-editing
+// telemetry hook extracted from handleChatCore's non-streaming success path (chatCore god-file
+// decomposition, #3501). The work is a fire-and-forget IIFE; uses a real temp DB and polls the
+// captured log. Locks: the enabled+claude guard, the no-telemetry no-op, and that a valid
+// applied_edits payload records and logs the cleared-token receipt.
+import { test, before, after } from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+const testDataDir = fs.mkdtempSync(path.join(os.tmpdir(), "omni-ctxedit-test-"));
+process.env.DATA_DIR = testDataDir;
+
+const coreDb = await import("../../src/lib/db/core.ts");
+const { recordContextEditingTelemetryHook } = await import(
+  "../../open-sse/handlers/chatCore/contextEditingTelemetry.ts"
+);
+
+function makeLog() {
+  const debug: string[] = [];
+  return {
+    log: { debug: (tag: string, msg: string) => debug.push(`${tag} ${msg}`) },
+    debug,
+  };
+}
+
+const telemetryBody = {
+  context_management: {
+    applied_edits: [{ cleared_input_tokens: 120, cleared_tool_uses: 3 }],
+  },
+};
+
+async function waitFor(pred: () => boolean, timeoutMs = 3000): Promise<void> {
+  const deadline = Date.now() + timeoutMs;
+  while (Date.now() < deadline && !pred()) {
+    await new Promise((r) => setTimeout(r, 25));
+  }
+}
+
+before(async () => {
+  await coreDb.ensureDbInitialized();
+});
+
+after(() => {
+  coreDb.resetDbInstance();
+  try {
+    fs.rmSync(testDataDir, { recursive: true, force: true });
+  } catch {
+    // best-effort cleanup
+  }
+});
+
+test("disabled context-editing is a no-op", async () => {
+  const { log, debug } = makeLog();
+  recordContextEditingTelemetryHook({
+    contextEditingEnabled: false,
+    provider: "claude",
+    responseBody: telemetryBody,
+    skillRequestId: "req-1",
+    log,
+  });
+  await new Promise((r) => setTimeout(r, 100));
+  assert.equal(debug.length, 0);
+});
+
+test("non-claude provider is a no-op", async () => {
+  const { log, debug } = makeLog();
+  recordContextEditingTelemetryHook({
+    contextEditingEnabled: true,
+    provider: "openai",
+    responseBody: telemetryBody,
+    skillRequestId: "req-2",
+    log,
+  });
+  await new Promise((r) => setTimeout(r, 100));
+  assert.equal(debug.length, 0);
+});
+
+test("valid applied_edits records and logs the cleared-token receipt", async () => {
+  const { log, debug } = makeLog();
+  recordContextEditingTelemetryHook({
+    contextEditingEnabled: true,
+    provider: "claude",
+    responseBody: telemetryBody,
+    skillRequestId: "req-3",
+    log,
+  });
+  await waitFor(() => debug.length > 0);
+  assert.ok(debug.length >= 1, "expected a CONTEXT_EDITING debug line");
+  assert.match(debug[0], /CONTEXT_EDITING/);
+  assert.match(debug[0], /cleared 120 input tokens \/ 3 tool uses \(1 edits\)/);
+});
+
+test("response without applied_edits is a silent no-op (no throw)", async () => {
+  const { log, debug } = makeLog();
+  recordContextEditingTelemetryHook({
+    contextEditingEnabled: true,
+    provider: "claude",
+    responseBody: { choices: [] },
+    skillRequestId: "req-4",
+    log,
+  });
+  await new Promise((r) => setTimeout(r, 100));
+  assert.equal(debug.length, 0);
+});