diff --git a/extensions/pi-workflow/ui-policy.test.ts b/extensions/pi-workflow/ui-policy.test.ts
index cd823b0..a73b886 100644
--- a/extensions/pi-workflow/ui-policy.test.ts
+++ b/extensions/pi-workflow/ui-policy.test.ts
@@ -76,6 +76,23 @@ test("backend workflow terminology does not imply a UI prototype", () => {
   assert.equal(result.impact, "none");
 });
 
+test("configuration files named settings do not imply a UI prototype", () => {
+  const result = enforceUiImpact({
+    plannerImpact: "none",
+    plannerEvidence: ["Configuration inventory only"],
+    affectedSurfaces: [],
+    facts: facts({
+      candidatePaths: [
+        "/home/user/.pi/agent/settings.json",
+        "config/settings.yaml",
+      ],
+      tags: ["configuration", "security"],
+    }),
+  });
+  assert.equal(result.impact, "none");
+  assert.equal(result.objectiveImpact, "none");
+});
+
 test("generic frontend evidence does not inflate a minor change", () => {
   const result = enforceUiImpact({
     plannerImpact: "minor",
diff --git a/extensions/pi-workflow/ui-policy.ts b/extensions/pi-workflow/ui-policy.ts
index c4f113e..927cefb 100644
--- a/extensions/pi-workflow/ui-policy.ts
+++ b/extensions/pi-workflow/ui-policy.ts
@@ -41,6 +41,18 @@ const NON_TRIVIAL_PATH_PARTS = [
   "/settings/",
 ];
 
+const UI_SOURCE_SUFFIXES = [
+  ".astro",
+  ".css",
+  ".html",
+  ".jsx",
+  ".less",
+  ".scss",
+  ".svelte",
+  ".tsx",
+  ".vue",
+];
+
 export interface UiImpactPolicyInput {
   plannerImpact: UiImpact;
   plannerEvidence: string[];
@@ -64,7 +76,13 @@ function objectiveEvidence(facts: WorkflowFacts) {
   }
   for (const candidatePath of facts.candidatePaths) {
     const normalized = `/${candidatePath.toLowerCase().replaceAll("\\", "/")}`;
-    if (NON_TRIVIAL_PATH_PARTS.some((part) => normalized.includes(part))) {
+    const isUiSource = UI_SOURCE_SUFFIXES.some((suffix) =>
+      normalized.endsWith(suffix),
+    );
+    if (
+      isUiSource &&
+      NON_TRIVIAL_PATH_PARTS.some((part) => normalized.includes(part))
+    ) {
       evidence.push(`Affected path has non-trivial UI responsibility: ${candidatePath}`);
     }
   }