diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 4901d84f7..0680ca84f 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed `omp completions <shell>` hanging after writing shell completion scripts to stdout by invoking `postmortem.quit(0)` upon completion. Prevents lingering event loop handles (such as background timers or sockets loaded when inspecting command metadata) from pinning the process and blocking tools like `chezmoi`.
+
 ## [17.3.5] - 2026-08-16
 
 ### Added
diff --git a/packages/coding-agent/src/commands/completions.ts b/packages/coding-agent/src/commands/completions.ts
index e7182b7ae..8c1d8202e 100644
--- a/packages/coding-agent/src/commands/completions.ts
+++ b/packages/coding-agent/src/commands/completions.ts
@@ -5,7 +5,7 @@
  * (see `cli/completion-gen.ts`), so it never drifts from the actual CLI surface.
  */
 
-import { APP_NAME, VERSION } from "@oh-my-pi/pi-utils";
+import { APP_NAME, postmortem, VERSION } from "@oh-my-pi/pi-utils";
 import { Args, type CliConfig, Command, type CommandCtor } from "@oh-my-pi/pi-utils/cli";
 import { completionsHelp as commandHelp } from "../cli/command-help";
 import { buildSpec, generateCompletion, type Shell } from "../cli/completion-gen";
@@ -55,6 +55,7 @@ export default class Completions extends Command {
 		}
 
 		await Bun.write(Bun.stdout, await generateLiveCompletion(shell));
+		await postmortem.quit(0);
 	}
 }
 
diff --git a/packages/coding-agent/test/cli-completions-exit.test.ts b/packages/coding-agent/test/cli-completions-exit.test.ts
new file mode 100644
index 000000000..5f631f60e
--- /dev/null
+++ b/packages/coding-agent/test/cli-completions-exit.test.ts
@@ -0,0 +1,21 @@
+import { afterEach, describe, expect, it, spyOn } from "bun:test";
+import { postmortem } from "@oh-my-pi/pi-utils";
+import Completions from "../src/commands/completions";
+
+describe("Completions command exit contract", () => {
+	afterEach(() => {
+		spyOn(postmortem, "quit").mockRestore();
+		spyOn(Bun, "write").mockRestore();
+	});
+
+	it("calls postmortem.quit(0) after writing completion script", async () => {
+		const quitSpy = spyOn(postmortem, "quit").mockResolvedValue(undefined);
+		const writeSpy = spyOn(Bun, "write").mockResolvedValue(0);
+		const config = { bin: "omp", version: "0.0.0", commands: new Map() };
+		const cmd = new Completions(["zsh"], config);
+		await cmd.run();
+
+		expect(writeSpy).toHaveBeenCalled();
+		expect(quitSpy).toHaveBeenCalledWith(0);
+	});
+});