Initial commit

opc/layer3_agent/prompt_harness/deltas.py

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+"""Artifact delta helpers."""
+
+from __future__ import annotations
+
+from typing import Iterable
+
+from .types import RuntimeArtifact
+
+
+def changed_artifacts(
+    artifacts: Iterable[RuntimeArtifact],
+    previous_hashes: dict[str, str] | None = None,
+) -> list[tuple[RuntimeArtifact, bool]]:
+    previous = dict(previous_hashes or {})
+    changed: list[tuple[RuntimeArtifact, bool]] = []
+    for artifact in artifacts:
+        content_hash = str(artifact.metadata.get("content_hash", "") or "")
+        is_delta = bool(previous.get(artifact.artifact_type)) and previous.get(artifact.artifact_type) != content_hash
+        changed.append((artifact, is_delta))
+    return changed