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Every pipeline must have an entry point. Without one, the pipeline cannot execute.

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What is an Entry Point?

The Entry Point defines which node executes first when your pipeline runs—the “starting line” of your workflow.

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Key Rules

Single Entry Point:
  • Exactly one node must be designated as the entry point
  • Pipeline execution always begins at this node
Node Eligibility:
  • ✔️ Can be entry points: LLM, Agent, Toolkit, MCP, Code, Custom, State Modifier, Printer, Decision
  • ✘ Cannot be entry points: Router node
Router nodes require input data to evaluate their conditions. At pipeline start, no state variables have been populated yet, so the router has nothing to evaluate.

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Setting an Entry Point

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Visual Method (Flow Editor)

Steps:
  1. Open your pipeline in the Flow Editor
  2. Click the three dots (⋮) on the node card
  3. Select Make entrypoint from the dropdown
After making a node the entry point, an Input icon appears at the top of the node card, indicating it’s the pipeline’s starting point. Setting Entry Point in Flow Editor
Setting a new entry point automatically removes the previous designation.

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YAML Method

In YAML configuration, define the entry point at the top level: 
entry_point: node_id

nodes:
  - id: node_id
    type: llm
    # ... node configuration
Valid Example: 
entry_point: greeting

nodes:
  - id: greeting
    type: llm
Invalid Examples: 
# ✘ Non-existent node
entry_point: missing_node

# ✘ Router as entry point
entry_point: route_decision
nodes:
  - id: route_decision
    type: router

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Best Practices

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Match Entry Point to Workflow Type

  • Conversational: Start with LLM node
  • Automated: Start with Toolkit or MCP node
  • AI-powered routing: Start with Decision node
  • Data processing: Start with Code node
  • User interaction: Start with Printer node (for displaying initial message)
  • State setup: Start with State Modifier node
  • Ensure entry_point value exactly matches a node id
  • Avoid Router nodes as entry points
  • Test that entry point node executes first
  • Confirm transition to next node works