Pi Codex Toolkit
Copyright 2026 Duo

This product includes modified portions of OpenAI Codex.

OpenAI Codex
Copyright 2025 OpenAI

The apply_patch grammar, parser semantics, and first three bounded matching
tiers in src/apply-patch.ts are modified from OpenAI Codex commit
b8c86376a258e55efc8e5ecfbabc21c16c07d814 under the Apache License 2.0.