CLI crashes with RangeError when background task generates large output

Description

Claude Code CLI v2.0.36 crashes with a RangeError: Invalid array length when a background bash task generates large amounts of output (600+ lines). The crash occurs in the rendering/display code when trying to show background task status.

Steps to Reproduce

1. Start a background Python script that prints 600+ lines of output
2. Use BashOutput tool or try to view background task status
3. CLI crashes with RangeError

Example that triggers the bug

# Python script that prints 710 URLs before downloading
for i, link in enumerate(links, 1):
    print(f"{i}. {link['name']}")
    print(f"   URL: {link['url']}")

When this runs as a background task and Claude tries to display the output, the CLI crashes.

Error Stack Trace

RangeError: Invalid array length
    at d1A (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:199:5463)
    at EYA.get (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:199:6664)
    at LTA.renderer (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:201:818)
    at LTA.onRender (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:220:5884)
    at XR0.YR0.signal (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:94:1908)
    at X (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:94:1315)
    at Object.E (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:94:1601)
    at Object.C [as onRender] (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:94:2103)
    at resetAfterCommit (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:196:356)
    at I4 (file:///opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/cli.js:100:39469)

Expected Behavior

CLI should gracefully handle large background task output, either by:

• Truncating output beyond a certain size
• Paginating the display
• Streaming output without storing it all in memory

Actual Behavior

CLI crashes and needs to be restarted. The crash occurs in LTA.renderer when the array buffer for displaying output becomes too large.

Environment

• Claude Code version: v2.0.36
• Platform: macOS (Darwin 24.5.0)
• Node.js installation: /opt/homebrew/lib/node_modules/@anthropic-ai/claude-code/

Workaround

Reduce the output from background scripts to avoid generating large amounts of output at once.

Impact

This makes it difficult to run long-running background tasks that need verbose logging or progress updates.