Nodes

A node is one step in a graph. The 19 node types:

Execution#

Node	Purpose
agent	A model-backed agent step. Config: model, system prompt, temperature, tools.
tool	An MCP tool invocation. Every call is a policy decision point.
transform	Pure data transformation between steps.
router	Conditional branch on a field or classifier output.
terminate	Ends the run.
trigger	Starts the run: inbound email, webhook, schedule, event.

Gates and human work#

Node	Purpose
gate.hitl	Human approval with quorum, SLA, escalation.
gate.policy	Policy evaluation gate (in addition to edge-level policy).
gate.eval	Evaluation-suite gate — blocks until the suite passes.
human_task	An assignment to a human (not an approval — work).

Structure#

Node	Purpose
map	Fan-out over a list; each item runs the subgraph.
subgraph	Nested graph reference.
wait	Pause for a duration or a condition.

Memory#

Node	Purpose
memory.read	Read from the workspace memory store.
memory.write	Write to the workspace memory store (a ledger event).
rag.retrieve	Retrieval from a connected vector store.

Example config#

nodes:
  triage:
    type: agent
    model: anthropic/claude-sonnet
    tools: [search, classify]
  approve:
    type: gate.hitl
    quorum: 2
    roles: [ops_lead, compliance]
    sla: 4h
    escalate: vp_ops

Every node type is covered in the DSL reference with its full schema.