rfc6902
Forgiving JSON (JSON5: comments, trailing commas) plus JSON Pointer and JSON Patch for surgical edits by path. Pure Python, zero dependencies.
Diff and patch for text (unified diff) and structured data (JSON Patch that round-trips). Pure Python, zero dependencies.
Domain-neutral critic→plan→execute loop for large LLM-generated JSON state. Surgical RFC 6902 patching with path_finder + context narrowing sub-agents. At 100 entities full-regen breaks (0% fix); this stack stays at 100% with 5× fewer tokens.