Core DSL reference

Import only the release-matched public entrypoint:

let tickr = import "lib.ncl" in

Workflow and graph

Export	Result
`mkWorkflow`	Workflow definition document
`mkTask`	Task value
`mkTaskGroup`	Task-group graph value
`mkEdge`	Edge between one or more typed Task endpoints
`chain`	Definition-time graph fragment with derived control edges
`mkLoop`	Loop document

Export	Result
`mkSignal`	Typed named Signal reference
`mkSignalEmit`	Success-side Signal emission from a routing variable
`mkSignalEmitOnFailure`	Failure-side Signal emission with Task lineage
`mkRoutingVar`	Typed routing-variable declaration
`mkSignalGate`	Gate satisfied by a matching Signal
`mkTimerGate`	Duration gate
`mkPredicateGate`	Routing-variable predicate gate
`mkTriggerOn`	Workflow trigger configuration
`mkTriggerCapture`	Trigger payload capture declaration

Routing-variable types:

string · int · bool · bytes · array

Predicate operators:

Eq · NotEq · Lt · Le · Gt · Ge

Export	Operation
`mkInsert`	Insert one Task
`mkChain`	Insert an ordered Task scope-tree
`mkFork`	Insert parallel arms and barrier join
`mkBranch`	Insert branch structure
`mkExpand`	Expand addressed structure
`mkSwap`	Replace addressed structure
`mkCut`	Cut addressed structure
`mkPrune`	Prune selected structure
`mkTrim`	Trim at a boundary
`mkTruncate`	Truncate beyond a boundary

chain and mkChain are intentionally different:

Field	Contract
`name`	Identifier
`nix_expression_path`	String
`args`	Array of strings
`outputs`	Array of strings; defaults empty
`inputs`	Bare names or structured input bindings; defaults empty
`secrets`	Array of strings; defaults empty
`routing_vars`	Optional array of `mkRoutingVar` values
`emits`	Optional array of Signal emit values
`max_attempts`	Integer `1..100`; defaults `3`
`timeout`	Optional duration

The contracts are closed. Unknown fields fail validation rather than passing through silently.