fix: escape newlines in shell arguments on Windows

close #70

cli/src/claude/claudeLocal.ts

@@ -8,6 +8,7 @@ import { systemPrompt } from "./utils/systemPrompt";
 import { withBunRuntimeEnv } from "@/utils/bunRuntime";
 import { spawnWithAbort } from "@/utils/spawnWithAbort";
 import { getHapiBlobsDir } from "@/constants/uploadPaths";
+import { stripNewlinesForWindowsShellArg } from "@/utils/shellEscape";
 
 export async function claudeLocal(opts: {
     abort: AbortSignal,
@@ -50,7 +51,7 @@ export async function claudeLocal(opts: {
         args.push('--resume', startFrom);
     }
 
-    args.push('--append-system-prompt', systemPrompt);
+    args.push('--append-system-prompt', stripNewlinesForWindowsShellArg(systemPrompt));
 
     const cleanupMcpConfig = appendMcpConfigArg(args, opts.mcpServers, {
         baseDir: projectDir

cli/src/claude/sdk/query.ts

@@ -25,6 +25,7 @@ import {
 import { getDefaultClaudeCodePath, logDebug, streamToStdin } from './utils'
 import { withBunRuntimeEnv } from '@/utils/bunRuntime'
 import { killProcessByChildProcess } from '@/utils/process'
+import { stripNewlinesForWindowsShellArg } from '@/utils/shellEscape'
 import type { Writable } from 'node:stream'
 import { logger } from '@/ui/logger'
 import { appendMcpConfigArg } from '../utils/mcpConfig'
@@ -289,8 +290,8 @@ export function query(config: {
     const args = ['--output-format', 'stream-json', '--verbose']
     let cleanupMcpConfig: (() => void) | null = null
 
-    if (customSystemPrompt) args.push('--system-prompt', customSystemPrompt)
-    if (appendSystemPrompt) args.push('--append-system-prompt', appendSystemPrompt)
+    if (customSystemPrompt) args.push('--system-prompt', stripNewlinesForWindowsShellArg(customSystemPrompt))
+    if (appendSystemPrompt) args.push('--append-system-prompt', stripNewlinesForWindowsShellArg(appendSystemPrompt))
     if (maxTurns) args.push('--max-turns', maxTurns.toString())
     if (model) args.push('--model', model)
     if (canCallTool) {
@@ -317,7 +318,7 @@ export function query(config: {
 
     // Handle prompt input
     if (typeof prompt === 'string') {
-        args.push('--print', prompt.trim())
+        args.push('--print', stripNewlinesForWindowsShellArg(prompt.trim()))
     } else {
         args.push('--input-format', 'stream-json')
     }

cli/src/utils/shellEscape.ts

@@ -0,0 +1,10 @@
+/**
+ * Strip newlines when passing args through Windows cmd.exe.
+ * cmd.exe treats CR/LF as command separators and truncates multiline args.
+ */
+export function stripNewlinesForWindowsShellArg(value: string): string {
+    if (process.platform !== 'win32') {
+        return value;
+    }
+    return value.replace(/\r?\n/g, ' ');
+}