fix: prevent corruption of native Claude Code binary on macOS#6
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itz4blitz merged 1 commit intoitz4blitz:mainfrom Jan 28, 2026
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The parallel-execution module was reading the Claude Code binary as UTF-8 text and writing it back, which corrupts native Mach-O binaries. Invalid byte sequences get replaced with U+FFFD replacement characters. This fix adds isNativeBinary() detection that checks Mach-O magic bytes (cffaedfe, cafebabe) and ELF header (7f454c46) before attempting any read/patch operations. Native binaries are now skipped with an appropriate error message. Fixes binary corruption when running 'npx @itz4blitz/agentful init' on systems with native Claude Code installed via the bash installer. - Add isNativeBinary() helper to detect compiled executables - Guard detectTeammateTool() against native binary reads - Guard enableTeammateTool() against native binary patching - Add tests for native binary detection and rejection
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Problem
The
parallel-execution.jsmodule corrupts native Claude Code binaries on macOS when runningnpx @itz4blitz/agentful init.The code reads the Claude Code binary as UTF-8 text (
fs.readFileSync(claudePath, 'utf8')), which replaces invalid byte sequences with U+FFFD replacement characters (ef bf bd). When written back, the binary becomes corrupted and fails withexec format error.This affects users who install Claude Code via the official bash installer (
curl -fsSL https://claude.ai/install.sh | bash), which produces a native Mach-O binary rather than the npm-installed JavaScript version.Solution
Added
isNativeBinary()helper that checks file magic bytes before any read operations:cffaedfe- Mach-O 64-bit (macOS arm64/x64)cafebabe- Mach-O universal binary7f454c46- ELF (Linux)Both
detectTeammateTool()andenableTeammateTool()now check for native binaries and skip patching with an appropriate message.Testing
Reproduction