diff --git a/packages/omo-codex/plugin/components/ultrawork/src/cli.ts b/packages/omo-codex/plugin/components/ultrawork/src/cli.ts
new file mode 100644
index 000000000..6b9d71fb0
--- /dev/null
+++ b/packages/omo-codex/plugin/components/ultrawork/src/cli.ts
@@ -0,0 +1,50 @@
+#!/usr/bin/env node
+import { stdin as processStdin, stdout as processStdout } from "node:process";
+
+import { runUserPromptSubmitHook } from "./codex-hook.js";
+
+const command = process.argv[2];
+const subcommand = process.argv[3];
+
+if (command === "hook" && subcommand === "user-prompt-submit") {
+	await runHookCli();
+} else {
+	process.stderr.write("Usage: omo-ultrawork hook user-prompt-submit\n");
+	process.exitCode = 1;
+}
+
+async function runHookCli(): Promise<void> {
+	const raw = await readStdin();
+	if (raw.trim().length === 0) return;
+	const parsed = parseHookInput(raw);
+	const output = runUserPromptSubmitHook(parsed);
+	if (output.length > 0) {
+		processStdout.write(output);
+	}
+}
+
+function parseHookInput(raw: string): unknown | undefined {
+	try {
+		const parsed: unknown = JSON.parse(raw);
+		return parsed;
+	} catch (error) {
+		if (error instanceof SyntaxError) return undefined;
+		throw error;
+	}
+}
+
+function readStdin(): Promise<string> {
+	return new Promise((resolve) => {
+		let data = "";
+		processStdin.setEncoding("utf8");
+		processStdin.on("data", (chunk: string) => {
+			data += chunk;
+		});
+		processStdin.once("error", () => {
+			resolve(data);
+		});
+		processStdin.once("end", () => {
+			resolve(data);
+		});
+	});
+}
diff --git a/packages/omo-codex/plugin/components/ultrawork/src/codex-hook.ts b/packages/omo-codex/plugin/components/ultrawork/src/codex-hook.ts
new file mode 100644
index 000000000..49317db9a
--- /dev/null
+++ b/packages/omo-codex/plugin/components/ultrawork/src/codex-hook.ts
@@ -0,0 +1,84 @@
+import { readFileSync } from "node:fs";
+
+import { ULTRAWORK_DIRECTIVE } from "./directive.js";
+
+const ULTRAWORK_PATTERN = /\b(?:ultrawork|ulw)\b/i;
+const CONTEXT_PRESSURE_MARKERS = [
+	"context compacted",
+	"context_length_exceeded",
+	"skill descriptions were shortened",
+	"context_too_large",
+	"codex ran out of room in the model's context window",
+	"your input exceeds the context window",
+	"long threads and multiple compactions",
+] as const;
+
+export type CodexUserPromptSubmitInput = {
+	readonly hook_event_name: "UserPromptSubmit";
+	readonly prompt: string;
+	readonly transcript_path?: string | null;
+};
+
+interface UserPromptSubmitHookOutput {
+	readonly hookSpecificOutput: {
+		readonly hookEventName: "UserPromptSubmit";
+		readonly additionalContext: string;
+	};
+}
+
+export function runUserPromptSubmitHook(input: unknown): string {
+	if (!isCodexUserPromptSubmitInput(input)) return "";
+	if (isContextPressureRecoveryPrompt(input.prompt)) return "";
+	if (isContextPressureTranscript(input.transcript_path)) return "";
+	return isUltraworkPrompt(input.prompt) ? formatAdditionalContextOutput(ULTRAWORK_DIRECTIVE) : "";
+}
+
+export function isUltraworkPrompt(prompt: string): boolean {
+	return ULTRAWORK_PATTERN.test(prompt);
+}
+
+function isContextPressureRecoveryPrompt(prompt: string): boolean {
+	const normalizedPrompt = prompt.toLowerCase();
+	return CONTEXT_PRESSURE_MARKERS.some((marker) => normalizedPrompt.includes(marker));
+}
+
+function isContextPressureTranscript(transcriptPath: string | null | undefined): boolean {
+	if (transcriptPath === undefined || transcriptPath === null) return false;
+	try {
+		return isContextPressureRecoveryPrompt(readFileSync(transcriptPath, "utf8"));
+	} catch (error) {
+		if (error instanceof Error) return false;
+		throw error;
+	}
+}
+
+function formatAdditionalContextOutput(additionalContext: string): string {
+	const normalizedContext = normalizeAdditionalContext(additionalContext);
+	if (normalizedContext.length === 0) return "";
+	const output: UserPromptSubmitHookOutput = {
+		hookSpecificOutput: {
+			hookEventName: "UserPromptSubmit",
+			additionalContext: normalizedContext,
+		},
+	};
+	return `${JSON.stringify(output)}\n`;
+}
+
+function normalizeAdditionalContext(additionalContext: string): string {
+	return additionalContext.replace(/\r\n/g, "\n").replace(/\r/g, "\n").trim();
+}
+
+function isCodexUserPromptSubmitInput(value: unknown): value is CodexUserPromptSubmitInput {
+	return (
+		isRecord(value) &&
+		value["hook_event_name"] === "UserPromptSubmit" &&
+		typeof value["prompt"] === "string" &&
+		(value["transcript_path"] === undefined ||
+			value["transcript_path"] === null ||
+			typeof value["transcript_path"] === "string")
+	);
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+	return typeof value === "object" && value !== null && !Array.isArray(value);
+}
diff --git a/packages/omo-codex/plugin/components/ultrawork/src/directive.ts b/packages/omo-codex/plugin/components/ultrawork/src/directive.ts
new file mode 100644
index 000000000..faf60ae6a
--- /dev/null
+++ b/packages/omo-codex/plugin/components/ultrawork/src/directive.ts
@@ -0,0 +1,3 @@
+import { readFileSync } from "node:fs";
+
+export const ULTRAWORK_DIRECTIVE: string = readFileSync(new URL("../directive.md", import.meta.url), "utf8");