diff --git a/apps/desktop/src/plugins/hermes-bots/canonical-chat-creation.test.ts b/apps/desktop/src/plugins/hermes-bots/canonical-chat-creation.test.ts
index a7b66d125d..635eb0c555 100644
--- a/apps/desktop/src/plugins/hermes-bots/canonical-chat-creation.test.ts
+++ b/apps/desktop/src/plugins/hermes-bots/canonical-chat-creation.test.ts
@@ -125,7 +125,15 @@ describe('the lazy row is materialized before anything else touches it', () => {
     const { createCanonicalChat } = await loadModule()
     await createCanonicalChat('alpha')
 
-    expect(created).toMatchObject({ hidden: true, title: 'Bot Chat' })
+    expect(created).toMatchObject({
+      hidden: true,
+      title: 'Bot Chat',
+      // The PR #97008 contract: the canonical Bot Chat's runtime always
+      // follows the profile's CURRENT config on resume — never the stored
+      // model/provider pin. Dropping this param silently regresses bots to
+      // the server's exact-title legacy fallback.
+      follow_profile_config: true
+    })
   })
 
   it('sends the one intro turn on New Bot creation (kickoff: true)', async () => {
diff --git a/apps/desktop/src/plugins/hermes-bots/canonical-chat.ts b/apps/desktop/src/plugins/hermes-bots/canonical-chat.ts
index ffcaffb590..62e1346801 100644
--- a/apps/desktop/src/plugins/hermes-bots/canonical-chat.ts
+++ b/apps/desktop/src/plugins/hermes-bots/canonical-chat.ts
@@ -302,7 +302,14 @@ export function createCanonicalChat(
       // plugin-owned. Core applies this via the generic `hidden` flag
       // (deferred as pending_hidden until the row exists); older gateways
       // ignore the unknown param and it stays visible.
-      hidden: true
+      hidden: true,
+      // Explicit contract (PR #97008): this session's runtime always follows
+      // the member profile's CURRENT config. Resume must NOT restore the
+      // stored model/provider pin from an old row — that left bot DMs stuck
+      // on a stale/dead provider after a profile switch. Older gateways
+      // ignore the unknown param; the server's exact-title backfill then
+      // covers the legacy path.
+      follow_profile_config: true
     })
 
     const sid = res?.stored_session_id
diff --git a/apps/desktop/src/plugins/hermes-bots/group-test-utils.ts b/apps/desktop/src/plugins/hermes-bots/group-test-utils.ts
index d8cd15679c..158bdf8234 100644
--- a/apps/desktop/src/plugins/hermes-bots/group-test-utils.ts
+++ b/apps/desktop/src/plugins/hermes-bots/group-test-utils.ts
@@ -30,6 +30,7 @@ export interface ScriptedMessage {
 }
 
 export interface ScriptedSession {
+  contracts?: { follow_profile_config: boolean; room_plumbing: boolean }
   messages: ScriptedMessage[]
   profile: string
   runtime: string
@@ -219,6 +220,10 @@ export function createGroupGateway(options: GatewayOptions = {}): ScriptedGatewa
       const title = String(params.title ?? '')
 
       const session: ScriptedSession = {
+        contracts: {
+          follow_profile_config: params.follow_profile_config === true,
+          room_plumbing: params.room_plumbing === true
+        },
         messages: [],
         profile,
         runtime: `rt-${profile}-${sequence}`,
diff --git a/apps/desktop/src/plugins/hermes-bots/group-turns.test.ts b/apps/desktop/src/plugins/hermes-bots/group-turns.test.ts
index 43a77c19d8..90b7deaef4 100644
--- a/apps/desktop/src/plugins/hermes-bots/group-turns.test.ts
+++ b/apps/desktop/src/plugins/hermes-bots/group-turns.test.ts
@@ -81,6 +81,26 @@ describe('session resolution', () => {
     expect(room.gateway.sessions.get(String(fresh.stored))?.title).toBe('Group: r-abc')
   })
 
+  it('creates member sessions with the room_plumbing + follow_profile_config contracts', async () => {
+    // The PR #97008 contracts: room member sessions always rebuild from the
+    // member profile's CURRENT config on resume, never a stale stored
+    // model/provider pin. Dropping either param silently regresses rooms to
+    // the server's hidden + "Group: " title legacy fallback.
+    const room = await loadRoom()
+
+    room.chat.updateGroupChat('Contract', current => {
+      current.roomId = 'r-contract'
+
+      return current
+    })
+    const handle = await room.turns.ensureGroupChatSession('Contract', { name: 'research', title: '' })
+
+    expect(room.gateway.sessions.get(String(handle.stored))?.contracts).toEqual({
+      follow_profile_config: true,
+      room_plumbing: true
+    })
+  })
+
   it('mints fresh member sessions when a same-name group is recreated after disband', async () => {
     const room = await loadRoom()
     const member: GroupMember = { name: 'research', title: '' }
diff --git a/apps/desktop/src/plugins/hermes-bots/group-turns.ts b/apps/desktop/src/plugins/hermes-bots/group-turns.ts
index b648885799..b9bd3e172c 100644
--- a/apps/desktop/src/plugins/hermes-bots/group-turns.ts
+++ b/apps/desktop/src/plugins/hermes-bots/group-turns.ts
@@ -198,7 +198,13 @@ export async function ensureGroupChatSession(group: string, member: GroupMember)
     profile: member.name,
     title,
     // Room member sessions are plumbing — always hidden from the sidebar.
-    hidden: true
+    hidden: true,
+    // Explicit contracts (PR #97008): room plumbing sessions always rebuild
+    // from the member profile's CURRENT config on resume, never a stale
+    // stored model/provider pin. Older gateways ignore the unknown params;
+    // the server's hidden + "Group: " title fallback then covers legacy.
+    room_plumbing: true,
+    follow_profile_config: true
   })) as { session_id?: string; stored_session_id?: string }
 
   const stored = created?.stored_session_id || null