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adr-pattern-cas-decoupled-execution-model

Decision

Promote the Decoupled Reasoning and Orchestration pattern to a global architectural standard for the CAS framework.

Context

  • Source: Governance Decision Record Workflow
  • Pattern: pattern-cas-decoupled-execution-model
  • Promotion Recommendation: recommendation-pattern-cas-decoupled-execution-model
  • Scope Classification: global
  • Scope Classification Artifact: pattern-scope-classification

This ADR formalizes the promotion of the CAS Decoupled Execution Model from a proposed pattern to an accepted global standard, based on successful implementation and recurring architecture work in the ideas-to-life-cas project.

Scope

Applicability: execution, automation, contracts

Applies to all CAS-based workflow implementations requiring separation between reasoning logic and orchestration runners.

Consequences

Governance

Mandatory compliance for all CAS-based workflows; requires structured YAML ADRs for all future execution model changes.

Execution

Workflows must strictly separate reasoning logic from the orchestration runner via prompt-based contracts to ensure implementation-agnostic execution.

System Behaviour

Increased modularity and portability of reasoning logic across different execution environments and knowledge provider implementations.

Evidence Summary

Promotion Evidence

recurring_architecture_work, current_architecture_state_support, cross_project_applicability

Promotion Criteria

significance, reusability, recurrence, evidence_quality, strategic_alignment

Governance Risks

No significant risks identified; pattern maturity is classified as established.

Traceability

Pattern Proposal

pattern-cas-decoupled-execution-model

Scope Classification

Artifact: pattern-scope-classification

Classification: global

Promotion Recommendation

recommendation-pattern-cas-decoupled-execution-model

Promotion Decision

promotion-decision-pattern-cas-decoupled-execution-model

Forum Review

Reviewed By

  • Architecture Forum

Rationale

Approved as a foundational architectural pattern for CAS. The pattern demonstrates recurring applicability across workflow implementations, clear separation of concerns, and strong evidence from architecture work and alignment findings.

Conditions

  • Implement CI/CD validation to detect violations of the decoupled execution model.
  • Reference this pattern from future workflow onboarding specifications where applicable.
  • Validate compliance through architecture alignment reviews.

Next Step

  • Generate institutional Pattern artifact from this approved ADR.
  • Update the Pattern Registry to reflect 'Accepted' status for global scope.
  • Configure CI/CD guardrails to enforce decoupled execution contracts.