Validation Reference

DLGValidator runs 11 checks in order. First failure raises.

#	Check	Exception
1	JSON Schema conformance	GraphValidationError
2	Security allowlist	GraphValidationError
3	Module existence	GraphValidationError
4	Callable attribute	GraphValidationError
5	Handler signature	GraphValidationError
6	Input/output schema subset	GraphValidationError
7	Cycle detection	StaticLoopException
8	Reachability analysis	UnreachableNodeException
9	Mixed routing conflict	MixedRoutingConflict
10	Send API target validation	SendTargetError
11	Subgraph compatibility	SubgraphCompatibilityError

Examples

Bad version → GraphValidationError:

{ "version": "not-semver" }

Cycle → StaticLoopException:

{ "static_edges": [{"from": "a", "to": "b"}, {"from": "b", "to": "a"}] }

Unreachable node → UnreachableNodeException:

{ "nodes": ["a", "orphan"], "edges": {"entry_point": "a", "static_edges": [{"from": "a", "to": "__end__"}]} }