Plain text that machines can read — a document format with images, tables, charts and typed records, in a file that still opens in any editor. Spec + 7 implementations.
Profile where Claude Code tokens actually go: a single Go binary that reads a session JSONL and prints a flame-graph-style tree of system / skill / mcp / file / reasoning / output, reconciled to real per-turn usage, plus an allocation_v1.json schema.