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
Compatibility matrix	SDK and engine version compatibility
Deprecation policy	Semantic versioning, deprecation timeline