diff --git a/tests/authority-vector-primary.mjs b/tests/authority-vector-primary.mjs
index b6b4f67..68dc8d8 100644
--- a/tests/authority-vector-primary.mjs
+++ b/tests/authority-vector-primary.mjs
@@ -33,6 +33,7 @@ const {
   isAuthorityVectorConfig,
   normalizeAuthorityVectorConfig,
   queryAuthorityTriviumNeighbors,
+  searchAuthorityTriviumNodes,
   applyAuthorityBmeVectorManifest,
 } = await import("../vector/authority-vector-primary-adapter.js");
 const {
@@ -125,6 +126,7 @@ function createMockTriviumClient({
       }
       return {
         results: [
+          { nodeId: "node-a", namespace: "other-chat", score: 0.95 },
           { nodeId: "node-b", score: 0.91 },
           { nodeId: "node-outside", score: 0.88 },
         ],
@@ -378,6 +380,7 @@ assert.equal(isAuthorityVectorConfig(config), true);
   assert.deepEqual(results, [{ nodeId: "node-b", score: 0.91 }]);
   const searchCall = triviumClient.calls.find(([name]) => name === "search");
   assert.deepEqual(searchCall?.[1]?.candidateIds.sort(), ["node-a", "node-b"]);
+  assert.equal(searchCall?.[1]?.namespace, "st-bme::chat-authority-vector");
   assert.equal(Array.isArray(searchCall?.[1]?.queryVector), true);
   assert.ok(searchCall?.[1]?.queryVector.length > 0);
   assert.equal(graph.vectorIndexState.lastSearchTimings.mode, "authority");
@@ -445,6 +448,50 @@ assert.equal(isAuthorityVectorConfig(config), true);
   }
 }
 
+{
+  const { graph } = createAuthorityVectorGraph();
+  const fetchCalls = [];
+  const fetchImpl = async (url, options = {}) => {
+    const body = JSON.parse(String(options.body || "{}"));
+    fetchCalls.push({ url: String(url), body });
+    if (String(url).endsWith("/session/init")) {
+      return {
+        ok: true,
+        status: 200,
+        json: async () => ({ sessionToken: "test-session" }),
+      };
+    }
+    return {
+      ok: true,
+      status: 200,
+      json: async () => ({
+        results: [
+          { externalId: "node-a", namespace: "other-chat", score: 0.99 },
+          { externalId: "node-b", namespace: "st-bme::chat-authority-vector", score: 0.93 },
+          { externalId: "node-c", score: 0.72 },
+        ],
+      }),
+    };
+  };
+
+  const results = await searchAuthorityTriviumNodes(graph, "archive door", config, {
+    namespace: "st-bme::chat-authority-vector",
+    collectionId: "st-bme::chat-authority-vector",
+    chatId: "chat-authority-vector",
+    queryVector: [1, 0, 0],
+    topK: 5,
+    fetchImpl,
+  });
+  const searchCall = fetchCalls.find((call) => call.url.endsWith("/trivium/search-hybrid"));
+  assert.equal(searchCall?.body?.namespace, "st-bme::chat-authority-vector");
+  assert.equal(searchCall?.body?.collectionId, "st-bme::chat-authority-vector");
+  assert.equal(searchCall?.body?.chatId, "chat-authority-vector");
+  assert.deepEqual(
+    results.map((entry) => entry.nodeId),
+    ["node-b", "node-c"],
+  );
+}
+
 {
   const { graph, first, second } = createAuthorityVectorGraph();
   const triviumClient = createMockTriviumClient({ failSearch: true });
diff --git a/vector/authority-vector-primary-adapter.js b/vector/authority-vector-primary-adapter.js
index 7f0ec6d..782c804 100644
--- a/vector/authority-vector-primary-adapter.js
+++ b/vector/authority-vector-primary-adapter.js
@@ -140,6 +140,15 @@ function normalizeNodeResultId(item = null) {
   );
 }
 
+function normalizeSearchResultNamespace(item = null) {
+  return normalizeRecordId(
+    item?.namespace ||
+      item?.collectionId ||
+      readNestedValue(item, ["payload", "namespace"]) ||
+      readNestedValue(item, ["payload", "collectionId"]),
+  );
+}
+
 function readResultRows(payload = null) {
   if (Array.isArray(payload)) return payload;
   if (!payload || typeof payload !== "object") return [];
@@ -211,12 +220,17 @@ function getNodeFieldText(node = {}, keys = []) {
   return "";
 }
 
-function normalizeSearchResults(payload = null) {
+function normalizeSearchResults(payload = null, { namespace = "" } = {}) {
   const rows = readResultRows(payload);
+  const expectedNamespace = normalizeRecordId(namespace);
   return rows
     .map((item, index) => {
       const nodeId = normalizeNodeResultId(item);
       if (!nodeId) return null;
+      const resultNamespace = normalizeSearchResultNamespace(item);
+      if (expectedNamespace && resultNamespace && resultNamespace !== expectedNamespace) {
+        return null;
+      }
       const rawScore = Number(item?.score ?? item?.similarity ?? item?.rankScore);
       const distance = Number(item?.distance);
       const score = Number.isFinite(rawScore)
@@ -224,7 +238,11 @@ function normalizeSearchResults(payload = null) {
         : Number.isFinite(distance)
           ? 1 / (1 + Math.max(0, distance))
           : Math.max(0.01, 1 - index / Math.max(1, rows.length));
-      return { nodeId, score };
+      return {
+        nodeId,
+        score,
+        ...(resultNamespace ? { namespace: resultNamespace } : {}),
+      };
     })
     .filter(Boolean);
 }
@@ -597,8 +615,12 @@ export class AuthorityTriviumHttpClient {
       throw new Error("Authority Trivium v0.6 search requires vector");
     }
     const queryText = String(payload.queryText || payload.text || payload.searchText || payload.query || "");
+    const namespace = getNamespace(payload);
     const body = {
       ...this.buildOpenOptions(payload),
+      ...(namespace ? { namespace } : {}),
+      ...(payload.collectionId ? { collectionId: String(payload.collectionId) } : {}),
+      ...(payload.chatId ? { chatId: String(payload.chatId) } : {}),
       vector,
       topK: Number(payload.topK || payload.limit || 0) || undefined,
       expandDepth: Number(payload.expandDepth || payload.depth || 0) || undefined,
@@ -1045,7 +1067,7 @@ export async function searchAuthorityTriviumNodes(graph, text, config = {}, opti
     topK: Math.max(1, Math.floor(Number(options.topK) || 1)),
     candidateIds: toArray(options.candidateIds).map(normalizeRecordId).filter(Boolean),
   });
-  return normalizeSearchResults(payload);
+  return normalizeSearchResults(payload, { namespace: options.namespace });
 }
 
 export async function testAuthorityTriviumConnection(config = {}, options = {}) {