Reference

Technical reference for UndoLog APIs, protocols, and configuration.

Document	Contents
Python SDK	UndoLogClient, UndoLogSession, @undolog_tool decorator
Go Proxy REST API	HTTP endpoints, request/response formats, SSE dashboard events
Rust Engine gRPC API	Service definitions, message types, call patterns
Configuration	Environment variables, proxy config, engine config
Tool tiers	Three-tier safety model: auto, confirm, gate
Call signature spec	BLAKE3 signature algorithm, canonical JSON format
Effect states	State machine: pending, running, compensated, completed, failed
Error codes	gRPC and HTTP error codes, meanings, recovery actions
Database schema	Table definitions, indexes, advisory lock key layout