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Graph-First Core: Released the new ATaC 1.0.0 core built around LangGraph orchestration and reusable tool assets.
Unified Tool Registration: Added AtacService to register both built-in agent tools and MCP tools, with named invocation through tool_call(...) from graph nodes.
Python SDK: Added a graph execution and tool invocation SDK so agents can reuse registered assets directly from workflow code.
Minimal Runtime Surface: Added four graph execution surfaces: atac graph, atac mcp, the HTTP service, and the Python SDK. The MCP surface exposes a single run_graph tool.
LangGraph Integration: Added atac.wrapper.langgraph and atac.subprocess to simplify LangGraph tool registration, MCP integration, and command execution.
Removed
Legacy Runtime Removal: Removed the historical YAML trajectory DSL, record runtime, old CLI/MCP workspace management, and the related schema, UI, memory, skills, and compatibility test surface.
Unified Package Surface: Removed the atac2 package and moved the graph-first core fully into the atac package for release.