fix(pi): close stdin before remote print-mode turns

Co-Authored-By: Paperclip <noreply@paperclip.ing>

packages/adapters/pi-local/src/server/execute.remote.test.ts

@@ -135,6 +135,9 @@ describe("pi remote execution", () => {
       const options = processSpy.mock.calls[0][4];
       expect(options.env.HOME).toBe(workFolderHome ?? runtimeRootDir);
       expect(options.env.PAPERCLIP_WORKSPACE_CWD).toBe("/home/daytona/repos/main");
+      // Pi consumes piped stdin before starting its turn, even with a prompt argument.
+      // An empty input asks the sandbox transport to deliver EOF instead of an open pipe.
+      expect(options.stdin).toBe("");
     } finally {
       vi.restoreAllMocks();
     }

packages/adapters/pi-local/src/server/execute.ts

@@ -723,6 +723,9 @@ export async function execute(ctx: AdapterExecutionContext): Promise<AdapterExec
       const proc = await runAdapterExecutionTargetProcess(runId, runtimeExecutionTarget, command, args, {
         cwd,
         env: executionTargetIsRemote ? env : runtimeEnv,
+        // Pi reads piped stdin before starting print mode. Remote transports must
+        // deliver EOF; leaving the session input pipe open stalls the first turn.
+        stdin: executionTargetIsRemote ? "" : undefined,
         timeoutSec,
         graceSec,
         onSpawn,

packages/plugins/sandbox-providers/daytona/src/plugin.test.ts

@@ -1503,6 +1503,21 @@ describe("Daytona sandbox provider plugin", () => {
       code: "PROCESS_NOT_FOUND", statusCode: 404,
     });
 
+    it("redirects empty stdin so a session command receives EOF", async () => {
+      process.env.DAYTONA_API_KEY = "host-key";
+      const sandbox = createMockSandbox();
+      mockGet.mockResolvedValue(sandbox);
+
+      await plugin.definition.onEnvironmentExecute?.(sessionExecParams({ stdin: "" }));
+
+      expect(sandbox.fs.uploadFile).toHaveBeenCalledWith(
+        Buffer.alloc(0), expect.stringMatching(/^\/tmp\/paperclip-stdin-/), 1,
+      );
+      const [, params] = sandbox.process.executeSessionCommand.mock.calls[0]!;
+      expect(params.command).toMatch(/< '\/tmp\/paperclip-stdin-/);
+      expect(sandbox.fs.deleteFile).toHaveBeenCalledWith(expect.stringMatching(/^\/tmp\/paperclip-stdin-/));
+    });
+
     it("replaces a disappeared session only when dispatch was rejected", async () => {
       process.env.DAYTONA_API_KEY = "host-key";
       const sandbox = createMockSandbox();
@@ -2272,7 +2287,7 @@ describe("Daytona sandbox provider plugin", () => {
     expect(mockGet).toHaveBeenCalledTimes(1);
   });
 
-  it("stages stdin in the sandbox filesystem when execution needs redirected input", async () => {
+  it.each(["input payload", ""])("stages redirected stdin, including EOF-only input (%j)", async (stdin) => {
     process.env.DAYTONA_API_KEY = "host-key";
     const sandbox = createMockSandbox();
     mockGet.mockResolvedValue(sandbox);
@@ -2290,12 +2305,12 @@ describe("Daytona sandbox provider plugin", () => {
       command: "cat",
       args: [],
       cwd: "/workspace",
-      stdin: "input payload",
+      stdin,
       timeoutMs: 1000,
     });
 
     expect(sandbox.fs.uploadFile).toHaveBeenCalledWith(
-      Buffer.from("input payload", "utf8"),
+      Buffer.from(stdin, "utf8"),
       expect.stringMatching(/^\/tmp\/paperclip-stdin-/),
       1,
     );