diff --git a/core/contract_resolver.py b/core/contract_resolver.py
index a53105d..ff7d7dd 100644
--- a/core/contract_resolver.py
+++ b/core/contract_resolver.py
@@ -64,6 +64,21 @@ def _load_json(path):
         return json.load(fh)
 
 
+# P14 (REQ-178): cache loaded JSON schemas so resolve() doesn't re-read
+# from disk on every call.
+_SCHEMA_CACHE: dict = {}
+
+
+def _load_schema(path):
+    """Load a JSON schema with caching (P14, REQ-178)."""
+    cached = _SCHEMA_CACHE.get(path)
+    if cached is not None:
+        return cached
+    schema = _load_json(path)
+    _SCHEMA_CACHE[path] = schema
+    return schema
+
+
 def _load_yaml(path):
     with open(path, "r") as fh:
         return yaml.safe_load(fh)
@@ -468,7 +483,7 @@ def resolve(contract_path, repo_root=None, environment_override=None):
         contract["environment"] = environment_override
 
     # Load schemas
-    contract_schema = _load_json(os.path.join(repo_root, "schemas", "contract.schema.json"))
+    contract_schema = _load_schema(os.path.join(repo_root, "schemas", "contract.schema.json"))
 
     # Validate contract against schema
     jsonschema.validate(contract, contract_schema)
@@ -588,7 +603,7 @@ def resolve(contract_path, repo_root=None, environment_override=None):
         stack_instance["outputs"] = merged_outputs
 
     # Validate against stack schema
-    stack_schema = _load_json(os.path.join(repo_root, "schemas", "stack.schema.json"))
+    stack_schema = _load_schema(os.path.join(repo_root, "schemas", "stack.schema.json"))
     jsonschema.validate(stack_instance, stack_schema)
 
     return stack_instance
diff --git a/core/output_publisher.py b/core/output_publisher.py
index 9543e47..3e1815a 100644
--- a/core/output_publisher.py
+++ b/core/output_publisher.py
@@ -38,8 +38,10 @@ from core import env as _envhelper
 SSM_PREFIX = "/nova"
 KMS_KEY_ID_ENV = "NOVA_KMS_KEY_ID"
 
-# Outputs that are safe to display in a PR comment (no secrets).
-SAFE_OUTPUT_NAMES = {
+# P14 (REQ-178): SAFE_OUTPUT_NAMES is schema-driven (derived from
+# modules/l1/*/interface.json outputs that don't have sensitive:true).
+# Falls back to the hardcoded set if the interfaces can't be read.
+_HARDCODED_SAFE_OUTPUTS = {
     "distribution_domain_name",
     "bucket_arn",
     "bucket_name",
@@ -59,6 +61,37 @@ SAFE_OUTPUT_NAMES = {
 }
 
 
+def _load_safe_output_names():
+    """Derive the safe-output allowlist from interface.json outputs.
+
+    P14 (REQ-178): scan modules/l1/*/interface.json; an output is safe if
+    its spec does not set sensitive:true. Falls back to the hardcoded set
+    if no interfaces are readable.
+    """
+    import json
+    from pathlib import Path
+    root = Path(__file__).resolve().parent.parent
+    safe = set()
+    try:
+        for iface in (root / "modules" / "l1").glob("*/interface.json"):
+            d = json.loads(iface.read_text())
+            outs = d.get("outputs", {})
+            if isinstance(outs, dict):
+                for name, spec in outs.items():
+                    if not (isinstance(spec, dict) and spec.get("sensitive")):
+                        safe.add(name)
+            elif isinstance(outs, list):
+                for out in outs:
+                    if isinstance(out, dict) and not out.get("sensitive"):
+                        safe.add(out.get("name", ""))
+    except (OSError, ValueError):
+        pass
+    return safe or _HARDCODED_SAFE_OUTPUTS
+
+
+SAFE_OUTPUT_NAMES = _load_safe_output_names()
+
+
 def _ssm_client():
     if boto3 is None:
         raise RuntimeError("boto3 is required for SSM publishing")