fix(opencode): recover empty bridge output sends

* fix(opencode): handle empty readiness bridge output

* fix(opencode): retry read-only bridge no-output

* fix(opencode): recover empty bridge output sends

---------

Co-authored-by: iliya <iliyazelenkog@gmail.com>

src/main/services/team/opencode/bridge/OpenCodeBridgeCommandClient.ts

@@ -89,6 +89,22 @@ export function resolveOpenCodeBridgeProcessCwd(
   return launcherDirectory && launcherDirectory !== '.' ? launcherDirectory : requestedCwd;
 }
 
+function shouldPreferShellForOpenCodeBridgeCommand(
+  binaryPath: string,
+  args: string[],
+  platform: NodeJS.Platform = process.platform
+): boolean {
+  if (platform !== 'win32') {
+    return false;
+  }
+  const extension = path.win32.extname(binaryPath).toLowerCase();
+  return (
+    WINDOWS_BATCH_EXTENSIONS.has(extension) &&
+    args[0] === 'runtime' &&
+    args[1] === 'opencode-command'
+  );
+}
+
 export class ExecCliOpenCodeBridgeProcessRunner implements OpenCodeBridgeProcessRunner {
   async run(input: OpenCodeBridgeProcessRunInput): Promise<OpenCodeBridgeProcessRunResult> {
     try {
@@ -97,6 +113,10 @@ export class ExecCliOpenCodeBridgeProcessRunner implements OpenCodeBridgeProcess
         timeout: input.timeoutMs,
         maxBuffer: input.stdoutLimitBytes + input.stderrLimitBytes,
         env: input.env,
+        preferShellForWindowsBatch: shouldPreferShellForOpenCodeBridgeCommand(
+          input.binaryPath,
+          input.args
+        ),
       });
       return {
         stdout: result.stdout,

src/main/services/team/opencode/bridge/OpenCodeReadinessBridge.ts

@@ -96,6 +96,15 @@ function buildSendPayloadHash(input: OpenCodeSendMessageCommandBody): string {
   return stableHash(hashable);
 }
 
+function isOpenCodeBridgeEmptyOutputFailure(result: OpenCodeBridgeResult<unknown>): boolean {
+  return (
+    !result.ok &&
+    result.error.kind === 'contract_violation' &&
+    (result.error.message === 'Bridge stdout was empty' ||
+      result.error.message === 'Bridge stdout was empty after retry')
+  );
+}
+
 export class OpenCodeReadinessBridge implements OpenCodeTeamRuntimeBridgePort {
   private readonly lastRuntimeSnapshotsByProjectPath = new Map<
     string,
@@ -384,12 +393,17 @@ export class OpenCodeReadinessBridge implements OpenCodeTeamRuntimeBridgePort {
         ? withOpenCodeObservedFallbackDiagnostic(result.data)
         : result.data;
     }
-    if (result.error.kind === 'timeout') {
+    if (result.error.kind === 'timeout' || isOpenCodeBridgeEmptyOutputFailure(result)) {
+      const recoveredAfterEmptyOutput = isOpenCodeBridgeEmptyOutputFailure(result);
       const recovered = await this.recoverSendMessageOutcome({
         originalRequestId: activeRequestId,
         body: activeBody,
-        diagnosticCode: 'opencode_send_recovered_after_bridge_timeout',
+        diagnosticCode: recoveredAfterEmptyOutput
-        diagnosticMessage: 'OpenCode bridge outcome recovered after timeout.',
+          ? 'opencode_send_recovered_after_bridge_empty_output'
+          : 'opencode_send_recovered_after_bridge_timeout',
+        diagnosticMessage: recoveredAfterEmptyOutput
+          ? 'OpenCode bridge outcome recovered after empty bridge output.'
+          : 'OpenCode bridge outcome recovered after timeout.',
       });
       if (recovered) {
         return usedObservedFallback ? withOpenCodeObservedFallbackDiagnostic(recovered) : recovered;

src/main/services/team/opencode/bridge/OpenCodeStateChangingBridgeCommandService.ts

@@ -209,7 +209,7 @@ export class OpenCodeStateChangingBridgeCommandService {
       );
 
       if (!result.ok) {
-        if (result.error.kind === 'timeout') {
+        if (isOpenCodeBridgeUnknownOutcomeFailure(result)) {
           await this.ledger.markUnknownAfterTimeout({
             idempotencyKey,
             error: result.error.message,
@@ -331,7 +331,9 @@ export class OpenCodeStateChangingBridgeCommandService {
           }),
       runId: input.runId ?? extractRunId(input.result) ?? undefined,
       severity: 'warning',
-      message: 'OpenCode bridge command timed out; outcome must be reconciled before retry',
+      message: isOpenCodeBridgeEmptyOutputFailure(input.result)
+        ? 'OpenCode bridge command exited without output; outcome must be reconciled before retry'
+        : 'OpenCode bridge command timed out; outcome must be reconciled before retry',
       createdAt: completedAt,
     });
   }
@@ -393,6 +395,21 @@ function isActiveOpenCodeBridgeCommandLeaseError(error: OpenCodeBridgeCommandLea
   return error.message.startsWith('OpenCode bridge command lease already active:');
 }
 
+function isOpenCodeBridgeUnknownOutcomeFailure(result: OpenCodeBridgeResult<unknown>): boolean {
+  return (
+    !result.ok && (result.error.kind === 'timeout' || isOpenCodeBridgeEmptyOutputFailure(result))
+  );
+}
+
+function isOpenCodeBridgeEmptyOutputFailure(result: OpenCodeBridgeResult<unknown>): boolean {
+  return (
+    !result.ok &&
+    result.error.kind === 'contract_violation' &&
+    (result.error.message === 'Bridge stdout was empty' ||
+      result.error.message === 'Bridge stdout was empty after retry')
+  );
+}
+
 function sleep(delayMs: number): Promise<void> {
   return new Promise((resolve) => setTimeout(resolve, delayMs));
 }

src/main/utils/childProcess.ts

@@ -355,10 +355,18 @@ function withCliProcessDefaults<
  * The return value matches the shape of Node's `execFile` promise: an
  * object with `stdout` and `stderr` strings.
  */
+export interface ExecCliOptions extends ExecFileOptions {
+  /**
+   * Some generated Windows launchers are safe to run directly, but callers can
+   * force the .cmd/.bat path when they need the launcher environment exactly.
+   */
+  preferShellForWindowsBatch?: boolean;
+}
+
 export async function execCli(
   binaryPath: string | null,
   args: string[],
-  options: ExecFileOptions = {}
+  options: ExecCliOptions = {}
 ): Promise<{ stdout: string; stderr: string }> {
   if (!binaryPath) {
     throw new Error(
@@ -366,8 +374,12 @@ export async function execCli(
     );
   }
   const target = binaryPath;
-  const opts = withCliProcessDefaults(options);
+  const { preferShellForWindowsBatch = false, ...execOptions } = options;
-  const directLauncher = resolveDirectWindowsLauncher(target);
+  const opts = withCliProcessDefaults(execOptions);
+  const directLauncher =
+    preferShellForWindowsBatch && isWindowsBatchLauncher(target)
+      ? null
+      : resolveDirectWindowsLauncher(target);
   if (directLauncher) {
     const result = await execFileAsync(
       directLauncher.command,

test/main/services/team/OpenCodeReadinessBridge.test.ts

@@ -585,6 +585,75 @@ describe('OpenCodeReadinessBridge', () => {
     ]);
   });
 
+  it('recovers accepted OpenCode sendMessage after empty bridge output through commandStatus', async () => {
+    const executor = fakeSequenceExecutor([
+      bridgeFailure('contract_violation', 'Bridge stdout was empty', [
+        {
+          id: 'diag-empty-output',
+          type: 'opencode_bridge_contract_violation',
+          providerId: 'opencode',
+          severity: 'error',
+          message: 'Bridge stdout was empty',
+          data: {
+            command: 'opencode.sendMessage',
+            outputSource: 'none',
+            outputReadError: 'ENOENT',
+          },
+          createdAt: '2026-04-21T12:00:00.000Z',
+        },
+      ]),
+      bridgeCommandSuccess({
+        command: 'opencode.commandStatus',
+        requestId: 'status-req-empty-output',
+        data: {
+          status: 'prompt_accepted',
+          safeToRetry: false,
+          accepted: true,
+          sessionId: 'session-bob',
+          runtimePromptMessageId: 'msg_prompt_1',
+          diagnostics: ['OpenCode prompt acceptance recovered from command status.'],
+        },
+      }),
+    ]);
+    const bridge = new OpenCodeReadinessBridge(executor);
+
+    await expect(
+      bridge.sendOpenCodeTeamMessage({
+        teamId: 'team-a',
+        teamName: 'team-a',
+        laneId: 'secondary:opencode:bob',
+        projectPath: '/repo',
+        memberName: 'bob',
+        text: 'hello',
+        messageId: 'message-1',
+        deliveryAttemptId: 'ledger-1:1:payload',
+      })
+    ).resolves.toMatchObject({
+      accepted: true,
+      sessionId: 'session-bob',
+      diagnostics: expect.arrayContaining([
+        expect.objectContaining({
+          code: 'opencode_send_recovered_after_bridge_empty_output',
+        }),
+      ]),
+    });
+
+    expect(executor.execute).toHaveBeenCalledTimes(2);
+    expect(executor.execute.mock.calls[1]).toEqual([
+      'opencode.commandStatus',
+      expect.objectContaining({
+        originalCommand: 'opencode.sendMessage',
+        originalRequestId: 'req-1',
+        deliveryAttemptId: 'ledger-1:1:payload',
+        payloadHash: expect.any(String),
+      }),
+      {
+        cwd: '/repo',
+        timeoutMs: 5_000,
+      },
+    ]);
+  });
+
   it('does not query commandStatus for non-timeout OpenCode sendMessage failures', async () => {
     const executor = fakeExecutor(bridgeFailure('provider_error', 'OpenCode send failed', []));
     const bridge = new OpenCodeReadinessBridge(executor);

test/main/services/team/OpenCodeStateChangingBridgeCommandService.test.ts

@@ -299,6 +299,50 @@ describe('OpenCodeStateChangingBridgeCommandService', () => {
     await expect(leaseStore.getActive('team-a')).resolves.toBeNull();
   });
 
+  it('records empty bridge output as unknown outcome and blocks duplicate retry', async () => {
+    bridge.resultFactory = ({ body, command, options }) => ({
+      ok: false,
+      schemaVersion: 1,
+      requestId: options.requestId,
+      command,
+      completedAt: '2026-04-21T12:00:10.000Z',
+      durationMs: 100,
+      error: {
+        kind: 'contract_violation',
+        message: 'Bridge stdout was empty',
+        retryable: false,
+      },
+      diagnostics: [],
+      data: body,
+    } as OpenCodeBridgeResult<unknown>);
+    const service = createService();
+
+    const first = await service.execute(buildLaunchInput());
+
+    expect(first).toMatchObject({
+      ok: false,
+      error: { kind: 'contract_violation' },
+    });
+    const idempotencyKey = bridge.calls[0].body.preconditions.idempotencyKey;
+    await expect(ledger.getByIdempotencyKey(idempotencyKey)).resolves.toMatchObject({
+      status: 'unknown_after_timeout',
+      retryable: false,
+      lastError: 'Bridge stdout was empty',
+    });
+    expect(diagnostics.append).toHaveBeenCalledWith(
+      expect.objectContaining({
+        type: 'opencode_bridge_unknown_outcome',
+        message: 'OpenCode bridge command exited without output; outcome must be reconciled before retry',
+      })
+    );
+
+    await expect(service.execute(buildLaunchInput())).rejects.toThrow(
+      'OpenCode bridge command outcome must be reconciled before retry'
+    );
+    expect(bridge.calls).toHaveLength(1);
+    await expect(leaseStore.getActive('team-a')).resolves.toBeNull();
+  });
+
   it('marks result precondition mismatch as failed and does not leave active lease', async () => {
     bridge.resultFactory = ({ body, options }) =>
       bridgeSuccess({

test/main/utils/childProcess.test.ts

@@ -425,6 +425,29 @@ describe('cli child process helpers', () => {
       }
     });
 
+    it('can force generated Bun cmd launchers through shell', async () => {
+      setPlatform('win32');
+      const execFileMock = child.execFile as unknown as Mock;
+      const execMock = child.exec as unknown as Mock;
+      execMock.mockImplementation((_cmd: string, _opts: unknown, cb: ExecCallback) => {
+        cb(null, 'ok', '');
+        return createMockProcess<ExecChild>();
+      });
+      const { dir, launcher } = createGeneratedBunLauncher();
+      try {
+        const result = await execCli(launcher, ['runtime', 'opencode-command'], {
+          preferShellForWindowsBatch: true,
+        });
+        expect(execFileMock).not.toHaveBeenCalled();
+        expect(execMock).toHaveBeenCalledTimes(1);
+        expect(execMock.mock.calls[0][0]).toContain('runtime');
+        expect(execMock.mock.calls[0][0]).toContain('opencode-command');
+        expect(result.stdout).toBe('ok');
+      } finally {
+        rmSync(dir, { recursive: true, force: true });
+      }
+    });
+
     it('executes extensionless npm node cmd launchers directly', async () => {
       setPlatform('win32');
       const execFileMock = child.execFile as unknown as Mock;