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fix: suppress stdout/stderr leak into TUI by using pipe instead of inherit #2423

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fix: suppress stdout/stderr leak into TUI by using pipe instead of inherit #2423

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4 changes: 2 additions & 2 deletions src/cli/config-manager/bun-install.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,8 @@ export async function runBunInstallWithDetails(): Promise<BunInstallResult> {
try {
const proc = spawnWithWindowsHide(["bun", "install"], {
cwd: cacheDir,
stdout: "inherit",
stderr: "inherit",
stdout: "pipe",
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@cubic-dev-ai cubic-dev-ai bot Mar 10, 2026 •
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P1: Custom agent: Opencode Compatibility

Use "ignore" instead of "pipe" to safely suppress output and prevent the child process from deadlocking when the OS pipe buffer fills up.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At src/cli/config-manager/bun-install.ts, line 34:

<comment>Use `"ignore"` instead of `"pipe"` to safely suppress output and prevent the child process from deadlocking when the OS pipe buffer fills up.</comment>

<file context>
@@ -31,8 +31,8 @@ export async function runBunInstallWithDetails(): Promise<BunInstallResult> {
       cwd: cacheDir,
-      stdout: "inherit",
-      stderr: "inherit",
+      stdout: "pipe",
+      stderr: "pipe",
     })
</file context>
Fix with Cubic

stderr: "pipe",
})

let timeoutId: ReturnType<typeof setTimeout>
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4 changes: 2 additions & 2 deletions src/cli/run/on-complete-hook.ts
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Expand Up @@ -26,8 +26,8 @@ export async function executeOnCompleteHook(options: {
DURATION_MS: String(durationMs),
MESSAGE_COUNT: String(messageCount),
},
stdout: "inherit",
stderr: "inherit",
stdout: "pipe",
stderr: "pipe",
Comment on lines +29 to +30
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@cubic-dev-ai cubic-dev-ai bot Mar 10, 2026 •
edited
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P1: Custom agent: Opencode Compatibility

Use "ignore" instead of "pipe" when discarding subprocess output. Leaving the streams as "pipe" without draining them will cause the subprocess to permanently hang if its output exceeds the OS pipe buffer size.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At src/cli/run/on-complete-hook.ts, line 29:

<comment>Use `"ignore"` instead of `"pipe"` when discarding subprocess output. Leaving the streams as `"pipe"` without draining them will cause the subprocess to permanently hang if its output exceeds the OS pipe buffer size.</comment>

<file context>
@@ -26,8 +26,8 @@ export async function executeOnCompleteHook(options: {
       },
-      stdout: "inherit",
-      stderr: "inherit",
+      stdout: "pipe",
+      stderr: "pipe",
     })
</file context>
Suggested change
stdout: "pipe",
stderr: "pipe",
stdout: "ignore",
stderr: "ignore",
Fix with Cubic

})

const hookExitCode = await proc.exited
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