From f73f88fb56381f0ea6746964bbd4a6496f7ec229 Mon Sep 17 00:00:00 2001
From: 陆奕丞 <01luyicheng@gmail.com>
Date: Sat, 31 Jan 2026 22:55:34 +0800
Subject: fix(pty): Add UTF-8 encoding defaults for Windows PTY (#11459)

---
 packages/opencode/src/pty/index.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/opencode/src/pty/index.ts b/packages/opencode/src/pty/index.ts
index 73474ed4f..d01b2b02e 100644
--- a/packages/opencode/src/pty/index.ts
+++ b/packages/opencode/src/pty/index.ts
@@ -108,6 +108,12 @@ export namespace Pty {
       TERM: "xterm-256color",
       OPENCODE_TERMINAL: "1",
     } as Record<string, string>
+
+    if (process.platform === "win32") {
+      env.LC_ALL = "C.UTF-8"
+      env.LC_CTYPE = "C.UTF-8"
+      env.LANG = "C.UTF-8"
+    }
     log.info("creating session", { id, cmd: command, args, cwd })
 
     const spawn = await pty()
-- 
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