Pattern Proposal: Declarative Steering Projection

Summary

Transforms raw VCS differences and capability definitions into verified, typed prompt facts to steer downstream agent generation.

Candidate Pattern

• ID: declarative-steering-projection
• Classification: governance
• Maturity: established
• Type: implemented

Observed Signals

No specific signals listed.

Evidence

Supporting Evidence

• src/cas_runner/steering/models.py (PromptFact, SteeringRuntimeIndex, ArchitecturalDelta, RawGitDelta) - Defines schemas for extracting structured prompt facts from raw VCS changes.

Scope Assessment

• Evidence Strength: high
• Confidence: high
• Applies to: ideas-to-life-cas

Rationale

• Intent: Ground agent reasoning in deterministic repository facts rather than unstructured prompt context.
• Context: Used during CI/CD architectural validation and projection builds where architectural delta must inform decisions.
• Force: LLMs hallucinate or misinterpret file changes if provided raw unbounded git diffs.
• Force: Parsing code directly on every invocation introduces token overhead and nondeterminism.

Traceability

Artifact source: proposed-patterns