feat: enable background bash execution on Windows

Author: ethanndickson

docs/system-prompt.md

@@ -62,5 +62,4 @@ You are in a git worktree at ${workspacePath}
 }
 ```
 
-
 {/* END SYSTEM_PROMPT_DOCS */}

src/cli/run.ts

@@ -269,7 +269,13 @@ async function main(): Promise<void> {
   const partialService = new PartialService(config, historyService);
   const initStateManager = new InitStateManager(config);
   const backgroundProcessManager = new BackgroundProcessManager();
-  const aiService = new AIService(config, historyService, partialService, initStateManager, backgroundProcessManager);
+  const aiService = new AIService(
+    config,
+    historyService,
+    partialService,
+    initStateManager,
+    backgroundProcessManager
+  );
   ensureProvidersConfig(config);
 
   const session = new AgentSession({

src/node/services/tools/bash.ts

@@ -239,16 +239,6 @@ export const createBashTool: ToolFactory = (config: ToolConfiguration) => {
 
       // Handle background execution
       if (run_in_background) {
-        // TODO: Add Windows support for background processes (process groups work differently)
-        if (process.platform === "win32") {
-          return {
-            success: false,
-            error: "Background execution is not yet supported on Windows",
-            exitCode: -1,
-            wall_duration_ms: 0,
-          };
-        }
-
         if (!config.workspaceId || !config.backgroundProcessManager || !config.runtime) {
           return {
             success: false,

tests/integration/backgroundBash.test.ts

@@ -120,7 +120,7 @@ describeIntegration("Background Bash Execution", () => {
           const startEvents = await sendMessageAndWait(
             env,
             workspaceId,
-            'Use the bash tool with run_in_background=true to run: sleep 30',
+            "Use the bash tool with run_in_background=true to run: sleep 30",
             HAIKU_MODEL,
             BACKGROUND_TOOLS,
             30000
@@ -144,7 +144,8 @@ describeIntegration("Background Bash Execution", () => {
           // Verify the process appears in the list
           const responseText = extractTextFromEvents(listEvents);
           expect(
-            responseText.includes(processId!) || toolOutputContains(listEvents, "bash_background_list", processId!)
+            responseText.includes(processId!) ||
+              toolOutputContains(listEvents, "bash_background_list", processId!)
           ).toBe(true);
 
           // Clean up: terminate the background process
@@ -196,7 +197,7 @@ describeIntegration("Background Bash Execution", () => {
           const startEvents = await sendMessageAndWait(
             env,
             workspaceId,
-            'Use bash with run_in_background=true to run: sleep 300',
+            "Use bash with run_in_background=true to run: sleep 300",
             HAIKU_MODEL,
             BACKGROUND_TOOLS,
             30000
@@ -236,8 +237,8 @@ describeIntegration("Background Bash Execution", () => {
           const listResponse = extractTextFromEvents(listEvents);
           expect(
             listResponse.toLowerCase().includes("killed") ||
-            listResponse.toLowerCase().includes("terminated") ||
-            toolOutputContains(listEvents, "bash_background_list", "killed")
+              listResponse.toLowerCase().includes("terminated") ||
+              toolOutputContains(listEvents, "bash_background_list", "killed")
           ).toBe(true);
         } finally {
           await cleanup();
@@ -313,8 +314,8 @@ describeIntegration("Background Bash Execution", () => {
           // The main assertion is that the process was tracked
           expect(
             hasExited ||
-            listResponse.includes(processId!) ||
-            toolOutputContains(listEvents, "bash_background_list", processId!)
+              listResponse.includes(processId!) ||
+              toolOutputContains(listEvents, "bash_background_list", processId!)
           ).toBe(true);
         } finally {
           await cleanup();