internal/

Package coord houses the workflow coordinator surface: the small behavioural contract a coord-side AgentRunner must implement (RunnerHandle), the four goai.Tool factories the coord LLM uses to drive a workflow (forward_to_agent / send_message / narrate / finalize), and the factory + default system prompt that wire those tools onto a pre-configured *AgentRunner.

Package exec is the zenflow execution core.

Package resume holds the persistence contract and default implementation for resumable step transcripts.

Package spec holds the workflow specification types - the schema-shaped data the YAML parser, validator, and executor share.

Package types holds the small, dependency-free contract surface of zenflow that can be shared across all internal packages without triggering an import cycle.