diff --git a/server/src/adapters/process/execute.test.ts b/server/src/adapters/process/execute.test.ts
new file mode 100644
index 0000000000..8f26bcf694
--- /dev/null
+++ b/server/src/adapters/process/execute.test.ts
@@ -0,0 +1,40 @@
+import { describe, expect, it, vi } from "vitest";
+
+const mocks = vi.hoisted(() => ({
+  runChildProcess: vi.fn(),
+}));
+
+vi.mock("../utils.js", async (importOriginal) => ({
+  ...(await importOriginal<typeof import("../utils.js")>()),
+  runChildProcess: mocks.runChildProcess,
+}));
+
+import { execute } from "./execute.js";
+
+describe("process adapter execution", () => {
+  it("fails when a child is terminated by a signal with no exit code", async () => {
+    mocks.runChildProcess.mockResolvedValueOnce({
+      exitCode: null,
+      signal: "SIGTERM",
+      timedOut: false,
+      stdout: "",
+      stderr: "",
+    });
+
+    const result = await execute({
+      runId: "signal-test",
+      agent: { id: "agent", companyId: "company" },
+      config: { command: process.execPath },
+      onLog: async () => {},
+      onMeta: async () => {},
+    } as any);
+
+    expect(result).toMatchObject({
+      exitCode: null,
+      signal: "SIGTERM",
+      timedOut: false,
+    });
+    expect(result.errorMessage).toContain("SIGTERM");
+    expect(result.resultJson).toEqual({ stdout: "", stderr: "" });
+  });
+});
diff --git a/server/src/adapters/process/execute.ts b/server/src/adapters/process/execute.ts
index 16ef40457e..8ce52c3f2e 100644
--- a/server/src/adapters/process/execute.ts
+++ b/server/src/adapters/process/execute.ts
@@ -80,6 +80,19 @@ export async function execute(ctx: AdapterExecutionContext): Promise<AdapterExec
     };
   }
 
+  if (proc.signal) {
+    return {
+      exitCode: proc.exitCode,
+      signal: proc.signal,
+      timedOut: false,
+      errorMessage: `Process terminated by signal ${proc.signal}`,
+      resultJson: {
+        stdout: proc.stdout,
+        stderr: proc.stderr,
+      },
+    };
+  }
+
   if ((proc.exitCode ?? 0) !== 0) {
     return {
       exitCode: proc.exitCode,