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Enterprise-MCP-Service-Bus/docs/adr/ADR-021-langgraph-langfuse-scope.en-us.md
2026-09-14 14:54:28 -03:00

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# ADR-021: Scope of LangGraph and Langfuse in the RI
**Status:** Accepted.
**Source:** this ADR is the canonical record of this decision. For implementation and validation context, see `RI/docs/AS-BUILT.md` and, when applicable, the relevant contract in `RI/docs/interfaces/`.
## Context
Scope of LangGraph/Langfuse (closes G8/P8).
## Decision
LangGraph only in the Service Orchestrator (EP-11) and the Agent Runtime handoff (EP-12); Langfuse only where there is an actual LLM call (EP-13). Checkpointer: SQLite in dev.
## Alternatives Considered
Also using LangGraph in the Gateway/Fabric for "stack consistency."
## Consequences
Avoids the over-engineering vetoed by section 6 of the superprompt; Gateway/Fabric remain plain Python.