claude-trace --index hangs indefinitely when summarizing conversations

[peak-flow]

Description

The --index command hangs when trying to call Claude CLI to generate conversation summaries.

Steps to Reproduce

1. Have existing .claude-trace/*.jsonl log files from previous Claude CLI sessions
2. Run claude-trace --index to generate summaries
3. Process hangs indefinitely at "Calling Claude CLI for summarization..."

Root Cause

In apps/claude-trace/src/index-generator.ts line 239-241, the code spawns the Claude CLI process with stdin set to "pipe":

const child = spawn("claude", ["-p", prompt], {
    stdio: ["pipe", "pipe", "pipe"],
});

When stdin is set to "pipe", the Claude CLI waits for input on stdin even though the prompt is passed as a command-line argument, resulting in an indefinite hang.

Fix

Change stdin from "pipe" to "ignore":

const child = spawn("claude", ["-p", prompt], {
    stdio: ["ignore", "pipe", "pipe"], // ignore stdin, pipe stdout/stderr
});

Testing

After this change, claude-trace --index completes successfully and generates the summary files and index.html.

Environment

• OS: macOS Sequoia 15.6.1
• Machine: MacBook Pro (M2 Max)
• Shell: zsh
• Node.js: v22.20.0
• npm: 10.9.3
• Claude CLI: 2.0.14 (Claude Code)
• Claude CLI Location: /opt/homebrew/bin/claude