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Graph Implementation Milestones

G1: Current Sequential Runtime

  • Node
  • NodeOutput
  • StateGraph
  • direct edges
  • conditional edges
  • recursion limit

G2: Builder And Compile Step

  • introduce GraphBuilder
  • introduce CompiledGraph
  • move validation to compile
  • add START and END
  • add input/output schema concepts
  • preserve current closure-node ergonomics

G3: Commands, Sends, And Typed Events

  • add Command
  • add Send
  • add GraphEvent
  • add event recorder
  • add destination hints for command-rendered edges

G4: Channels And Partial Updates

  • add Channel trait
  • add state update type
  • add last-value, append, aggregate, topic, and message reducers
  • add invalid concurrent update errors
  • add partial update examples

G5: Supersteps And Parallel Execution

  • add multi-active-task executor
  • apply writes at step boundaries
  • add waiting/barrier edges
  • add concurrency limits
  • add task stream events

G6: Checkpointing, Interrupts, And Time Travel

  • add Checkpointer
  • add in-memory backend
  • add checkpoint tuples and pending writes
  • add interrupt/resume API
  • add get_state, get_state_history, and update_state
  • add durability modes

G7: Policies, Cache, And Error Handlers

  • add graph and node defaults
  • add retry, timeout, cache, and error-handler policies
  • replay cached writes
  • add cooperative drain

G8: Subgraphs And Namespaces

  • add subgraph node
  • add checkpoint namespaces
  • add parent command routing
  • stream nested subgraph events
  • expose child state in task metadata

G9: Sub-Agents And Recursion

  • add SubAgentNode
  • add child run hierarchy
  • add context forking for parallel sub-agents
  • add shared-cache fork policy
  • add recursion stack
  • add depth events
  • add max-depth policy
  • roll up child usage and cost events

G10: Full Graph Streaming And Introspection

  • expose async graph event streams
  • add stream projections for values, updates, messages, custom data, checkpoints, tasks, and debug
  • forward harness streams with node context
  • add stream transformers
  • add JSON and Mermaid graph exports