fix: support cmux tmux compatibility

docs/reference/features.md

@@ -92,6 +92,8 @@ When running inside tmux:
 - Auto-cleanup when agents complete
 - **Stable agent ordering**: core-agent tab cycling is deterministic via injected runtime order field (Sisyphus: 1, Hephaestus: 2, Prometheus: 3, Atlas: 4)
 
+When running inside cmux (`cmux omo`), the same pane integration is routed through cmux's tmux compatibility command. OMO detects the cmux environment from `CMUX_SOCKET_PATH` or a cmux-provided `TMUX` value, so `tmux.enabled` can create cmux panes even when a real `tmux` binary is not installed.
+
 Customize agent models, prompts, and permissions in `oh-my-opencode.jsonc`.
 
 ### Team Mode (experimental, OFF by default)

script/run-ci-tests.ts

@@ -23,6 +23,7 @@ const ALWAYS_ISOLATED_TEST_FILES = [
   "src/openclaw/__tests__/reply-listener-discord.test.ts",
   "src/tools/background-task/create-background-output.blocking.test.ts",
   "src/tools/background-task/tools.test.ts",
+  "src/tools/interactive-bash/tmux-path-resolver.test.ts",
   "src/tools/task/task-list.test.ts",
 ] as const
 

src/shared/tmux/runner.test.ts

@@ -1,6 +1,6 @@
 /// <reference types="bun-types" />
 
-import { afterAll, describe, expect, test } from "bun:test"
+import { afterAll, beforeEach, describe, expect, test } from "bun:test"
 import { randomUUID } from "node:crypto"
 import fs from "node:fs/promises"
 import os from "node:os"
@@ -9,6 +9,9 @@ import path from "node:path"
 import { runTmuxCommand } from "./runner"
 
 const temporaryDirectories: string[] = []
+const originalCmuxSocketPath = process.env.CMUX_SOCKET_PATH
+const originalTmux = process.env.TMUX
+const originalPath = process.env.PATH
 
 async function createTemporaryDirectory(): Promise<string> {
 	const directoryPath = await fs.mkdtemp(path.join(os.tmpdir(), "tmux-runner-"))
@@ -21,7 +24,39 @@ async function readInvocationCount(counterFilePath: string): Promise<number> {
 	return Number.parseInt(count, 10)
 }
 
+async function createFakeCmux(directoryPath: string, argsFilePath: string): Promise<string> {
+	const cmuxPath = path.join(directoryPath, "cmux")
+	const script = [
+		"#!/bin/sh",
+		"printf '%s\\n' \"$@\" > \"$1.args\"",
+		"printf '%s\\n' '%42'",
+	].join("\n")
+	await fs.writeFile(cmuxPath, script.replace("$1.args", argsFilePath), "utf8")
+	await fs.chmod(cmuxPath, 0o755)
+	return cmuxPath
+}
+
+beforeEach(() => {
+	delete process.env.CMUX_SOCKET_PATH
+	delete process.env.TMUX
+	process.env.PATH = originalPath
+})
+
 afterAll(async () => {
+	if (originalCmuxSocketPath === undefined) {
+		delete process.env.CMUX_SOCKET_PATH
+	} else {
+		process.env.CMUX_SOCKET_PATH = originalCmuxSocketPath
+	}
+
+	if (originalTmux === undefined) {
+		delete process.env.TMUX
+	} else {
+		process.env.TMUX = originalTmux
+	}
+
+	process.env.PATH = originalPath
+
 	for (const directoryPath of temporaryDirectories) {
 		await fs.rm(directoryPath, { recursive: true, force: true })
 	}
@@ -124,4 +159,26 @@ describe("runTmuxCommand", () => {
 		expect(success).toBe(true)
 		expect(output).toBe("%9")
 	})
+
+	test("#given cmux environment #when run #then delegates through cmux tmux compatibility command", async () => {
+		// given
+		const temporaryDirectory = await createTemporaryDirectory()
+		const argsFilePath = path.join(temporaryDirectory, "cmux.args")
+		const cmuxPath = await createFakeCmux(temporaryDirectory, argsFilePath)
+		process.env.CMUX_SOCKET_PATH = path.join(temporaryDirectory, "cmux.sock")
+		process.env.PATH = `${temporaryDirectory}${path.delimiter}${originalPath ?? ""}`
+
+		// when
+		const result = await runTmuxCommand(cmuxPath, ["display-message", "-p", "#{pane_id}"])
+
+		// then
+		expect(result).toEqual({
+			success: true,
+			output: "%42",
+			stdout: "%42",
+			stderr: "",
+			exitCode: 0,
+		})
+		await expect(fs.readFile(argsFilePath, "utf8")).resolves.toBe("__tmux-compat\ndisplay-message\n-p\n#{pane_id}\n")
+	})
 })

src/shared/tmux/runner.ts

@@ -36,13 +36,19 @@ function isTerminalTmuxError(stderr: string): boolean {
  * `cmux __tmux-compat` so they become native cmux splits instead of
  * failing because there is no real tmux server running.
  */
-function resolveTmuxExecutable(tmuxPath: string): string[] {
-	const inCmux = Boolean(process.env.CMUX_SOCKET_PATH) ||
+function isCmuxCompatEnvironment(): boolean {
+	return Boolean(process.env.CMUX_SOCKET_PATH) ||
 		process.env.TMUX?.includes("cmuxterm") === true
-	if (inCmux) {
-		return ["cmux", "__tmux-compat"]
+}
+
+function resolveTmuxExecutable(tmuxPath: string): string[] {
+	if (!isCmuxCompatEnvironment()) {
+		return [tmuxPath]
 	}
-	return [tmuxPath]
+
+	const executableName = tmuxPath.split(/[\\/]/).pop()
+	const cmuxExecutable = executableName === "cmux" ? tmuxPath : "cmux"
+	return [cmuxExecutable, "__tmux-compat"]
 }
 
 async function runTmuxCommandOnce(tmuxPath: string, args: Array<string>, timeoutMs?: number): Promise<TmuxCommandResult> {

src/tools/interactive-bash/tmux-path-resolver.test.ts

@@ -0,0 +1,72 @@
+/// <reference types="bun-types" />
+
+import { afterAll, beforeEach, describe, expect, test } from "bun:test"
+import fs from "node:fs/promises"
+import os from "node:os"
+import path from "node:path"
+
+import { getTmuxPath, resetTmuxPathCacheForTesting } from "./tmux-path-resolver"
+
+const temporaryDirectories: string[] = []
+const originalCmuxSocketPath = process.env.CMUX_SOCKET_PATH
+const originalTmux = process.env.TMUX
+const originalPath = process.env.PATH
+
+async function createTemporaryDirectory(): Promise<string> {
+	const directoryPath = await fs.mkdtemp(path.join(os.tmpdir(), "tmux-path-resolver-"))
+	temporaryDirectories.push(directoryPath)
+	return directoryPath
+}
+
+async function createExecutable(directoryPath: string, name: string, script: string): Promise<string> {
+	const executablePath = path.join(directoryPath, name)
+	await fs.writeFile(executablePath, script, "utf8")
+	await fs.chmod(executablePath, 0o755)
+	return executablePath
+}
+
+beforeEach(() => {
+	resetTmuxPathCacheForTesting()
+	delete process.env.CMUX_SOCKET_PATH
+	delete process.env.TMUX
+	process.env.PATH = originalPath
+})
+
+afterAll(async () => {
+	resetTmuxPathCacheForTesting()
+
+	if (originalCmuxSocketPath === undefined) {
+		delete process.env.CMUX_SOCKET_PATH
+	} else {
+		process.env.CMUX_SOCKET_PATH = originalCmuxSocketPath
+	}
+
+	if (originalTmux === undefined) {
+		delete process.env.TMUX
+	} else {
+		process.env.TMUX = originalTmux
+	}
+
+	process.env.PATH = originalPath
+
+	for (const directoryPath of temporaryDirectories) {
+		await fs.rm(directoryPath, { recursive: true, force: true })
+	}
+})
+
+describe("getTmuxPath", () => {
+	test("#given cmux environment #when cmux is available #then returns cmux without requiring a real tmux binary", async () => {
+		// given
+		const temporaryDirectory = await createTemporaryDirectory()
+		const cmuxPath = await createExecutable(temporaryDirectory, "cmux", "#!/bin/sh\nexit 0\n")
+		await createExecutable(temporaryDirectory, "tmux", "#!/bin/sh\nexit 1\n")
+		process.env.CMUX_SOCKET_PATH = path.join(temporaryDirectory, "cmux.sock")
+		process.env.PATH = `${temporaryDirectory}${path.delimiter}${originalPath ?? ""}`
+
+		// when
+		const resolvedPath = await getTmuxPath()
+
+		// then
+		expect(path.basename(resolvedPath ?? "")).toBe(path.basename(cmuxPath))
+	})
+})

src/tools/interactive-bash/tmux-path-resolver.ts

@@ -2,13 +2,24 @@ import { spawn } from "../../shared/bun-spawn-shim"
 
 let tmuxPath: string | null = null
 let initPromise: Promise<string | null> | null = null
+let tmuxPathEnvironmentKey: "cmux" | "tmux" | null = null
 
-async function findTmuxPath(): Promise<string | null> {
+function isCmuxCompatEnvironment(): boolean {
+  return Boolean(process.env.CMUX_SOCKET_PATH) ||
+    process.env.TMUX?.includes("cmuxterm") === true
+}
+
+function getEnvironmentKey(): "cmux" | "tmux" {
+  return isCmuxCompatEnvironment() ? "cmux" : "tmux"
+}
+
+async function findCommandPath(command: string): Promise<string | null> {
   const isWindows = process.platform === "win32"
   const cmd = isWindows ? "where" : "which"
 
   try {
-    const proc = spawn([cmd, "tmux"], {
+    const proc = spawn([cmd, command], {
+      env: process.env,
       stdout: "pipe",
       stderr: "pipe",
     })
@@ -25,7 +36,21 @@ async function findTmuxPath(): Promise<string | null> {
       return null
     }
 
+    return path
+  } catch {
+    return null
+  }
+}
+
+async function findVerifiedTmuxPath(): Promise<string | null> {
+  const path = await findCommandPath("tmux")
+  if (!path) {
+    return null
+  }
+
+  try {
     const verifyProc = spawn([path, "-V"], {
+      env: process.env,
       stdout: "pipe",
       stderr: "pipe",
     })
@@ -41,18 +66,34 @@ async function findTmuxPath(): Promise<string | null> {
   }
 }
 
+async function findTmuxPath(): Promise<string | null> {
+  if (isCmuxCompatEnvironment()) {
+    const cmuxPath = await findCommandPath("cmux")
+    if (cmuxPath) {
+      return cmuxPath
+    }
+  }
+
+  return findVerifiedTmuxPath()
+}
+
 export async function getTmuxPath(): Promise<string | null> {
-  if (tmuxPath !== null) {
+  const environmentKey = getEnvironmentKey()
+  if (tmuxPath !== null && tmuxPathEnvironmentKey === environmentKey) {
     return tmuxPath
   }
 
-  if (initPromise) {
+  if (initPromise && tmuxPathEnvironmentKey === environmentKey) {
     return initPromise
   }
 
+  tmuxPathEnvironmentKey = environmentKey
+  const promiseEnvironmentKey = environmentKey
   initPromise = (async () => {
     const path = await findTmuxPath()
-    tmuxPath = path
+    if (tmuxPathEnvironmentKey === promiseEnvironmentKey) {
+      tmuxPath = path
+    }
     return path
   })()
 
@@ -63,6 +104,12 @@ export function getCachedTmuxPath(): string | null {
   return tmuxPath
 }
 
+export function resetTmuxPathCacheForTesting(): void {
+  tmuxPath = null
+  initPromise = null
+  tmuxPathEnvironmentKey = null
+}
+
 export function startBackgroundCheck(): void {
   if (!initPromise) {
     initPromise = getTmuxPath()