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5/12/2026
The YAML bug that taught me what bidirectional sync between Claude Code and Codex actually costs

The YAML bug that taught me what bidirectional sync between Claude Code and Codex actually costs

Short summary

Claude Code's lenient YAML parser and Codex's strict YAML 1.2 parser disagreed on glob patterns, causing a skill's name field to vanish. The fix: a shared utility that correctly quotes all YAML c-indicators. Lesson: bidirectional sync is a continuous diff problem across overlapping vocabularies, not a one-shot migration.

  • •Claude's lenient YAML vs. Codex's strict YAML 1.2 caused a field to silently drop
  • •Solution: shared utility module handling all 19 YAML c-indicators correctly
  • •Insight: bidirectional sync requires continuous diff logic, not a migration wizard

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