What happened?
mu aborts with ❌ Error fetching usage data: Maximum call stack size exceeded and prints no table at all. Nothing is corrupt — it is purely volume: my ~/.claude/projects/ holds 120,654 assistant messages.
autoDetect merges the per-source results with a spread (src/usage.ts:76):
allMessages.push(...messages);
Every message becomes its own argument, and V8 throws once the argument count reaches roughly 100k. The same pattern sits in src/sources/claude.ts:64 and src/sources/pi.ts:64, still below the threshold because those accumulate per directory.
-t and -p are no workaround — filtering happens after the merge.
Expected: the usage table, same as with a smaller history.
Steps to reproduce
# Requires a Claude Code history with >100k assistant messages
# (mine: ~/.claude/projects/, 120654 messages)
$ mu -s claude
❌ Error fetching usage data: Maximum call stack size exceeded
$ mu
❌ Error fetching usage data: Maximum call stack size exceeded
# The source adapter itself is fine — only the merge fails:
$ node -e "require('./dist/sources/claude.js').readSessions().then(r => console.log(r.messages.length))"
120654Which data sources are affected?
Claude Code
mu version
3.1.1
Environment
macOS 26.6.2, Node v22.23.2
What happened?
muaborts with❌ Error fetching usage data: Maximum call stack size exceededand prints no table at all. Nothing is corrupt — it is purely volume: my~/.claude/projects/holds 120,654 assistant messages.autoDetectmerges the per-source results with a spread (src/usage.ts:76):Every message becomes its own argument, and V8 throws once the argument count reaches roughly 100k. The same pattern sits in
src/sources/claude.ts:64andsrc/sources/pi.ts:64, still below the threshold because those accumulate per directory.-tand-pare no workaround — filtering happens after the merge.Expected: the usage table, same as with a smaller history.
Steps to reproduce
Which data sources are affected?
Claude Code
mu version
3.1.1
Environment
macOS 26.6.2, Node v22.23.2