fix(matrix): allow per-room reuse without stored account metadata

docs/gateway/configuration-reference.md

@@ -655,6 +655,7 @@ Matrix is extension-backed and configured under `channels.matrix`.
   - `sessionFilter`: optional session key patterns (substring or regex).
   - `target`: where to send approval prompts. `"dm"` (default), `"channel"` (originating room), or `"both"`.
   - Per-account overrides: `channels.matrix.accounts.<id>.execApprovals`.
+- `channels.matrix.dm.sessionScope` controls how Matrix DMs group into sessions: `per-user` (default) shares by routed peer, while `per-room` isolates each DM room.
 - Matrix status probes and live directory lookups use the same proxy policy as runtime traffic.
 - Full Matrix configuration, targeting rules, and setup examples are documented in [Matrix](/channels/matrix).
 

extensions/matrix/src/session-route.test.ts

@@ -304,4 +304,61 @@ describe("resolveMatrixOutboundSessionRoute", () => {
       to: "room:!dm:example.org",
     });
   });
+
+  it("reuses the current DM room when stored account metadata is missing", () => {
+    const storePath = createTempStore({
+      "agent:main:matrix:channel:!dm:example.org": {
+        sessionId: "sess-1",
+        updatedAt: Date.now(),
+        chatType: "direct",
+        origin: {
+          chatType: "direct",
+          from: "matrix:@alice:example.org",
+          to: "room:!dm:example.org",
+        },
+        deliveryContext: {
+          channel: "matrix",
+          to: "room:!dm:example.org",
+        },
+      },
+    });
+    const cfg = {
+      session: {
+        store: storePath,
+      },
+      channels: {
+        matrix: {
+          defaultAccount: "ops",
+          accounts: {
+            ops: {
+              dm: {
+                sessionScope: "per-room",
+              },
+            },
+          },
+        },
+      },
+    } satisfies OpenClawConfig;
+
+    const route = resolveMatrixOutboundSessionRoute({
+      cfg,
+      agentId: "main",
+      currentSessionKey: "agent:main:matrix:channel:!dm:example.org",
+      target: "@alice:example.org",
+      resolvedTarget: {
+        to: "@alice:example.org",
+        kind: "user",
+        source: "normalized",
+      },
+    });
+
+    expect(route).toMatchObject({
+      sessionKey: "agent:main:matrix:channel:!dm:example.org",
+      baseSessionKey: "agent:main:matrix:channel:!dm:example.org",
+      peer: { kind: "channel", id: "!dm:example.org" },
+      chatType: "direct",
+      from: "matrix:@alice:example.org",
+      to: "room:!dm:example.org",
+    });
+  });
 });

extensions/matrix/src/session-route.ts

@@ -55,7 +55,7 @@ function resolveMatrixCurrentDmRoomId(params: {
     if (!currentSession) {
       return undefined;
     }
-    if (!currentSession.accountId || currentSession.accountId !== params.accountId) {
+    if (currentSession.accountId && currentSession.accountId !== params.accountId) {
       return undefined;
     }
     if (!currentSession.directUserId || currentSession.directUserId !== params.targetUserId) {