feat: add room member list, AI agent naming, and fix invite flow

- Add clickable member count in room header that shows a dropdown with
  all room members (AI agent + humans) with role badges
- Give each room's AI agent a random name from 10 options (Nova, Atlas,
  Sage, etc.), editable when creating the room
- Replace AI text avatar with a robot SVG icon across all components
- Fix broken invite system: add client-side URL routing for /invite/:token,
  handle post-login invite acceptance via sessionStorage, and return
  room_id from accept_invite endpoint for auto-navigation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/components/app.riot

@@ -168,6 +168,9 @@
         if (user && isAuthenticated()) {
           this.update({ user })
           this.initChat()
+        } else {
+          // Not logged in — store invite token so we can accept after login
+          this.checkPendingInvite()
         }
       },
 
@@ -216,7 +219,7 @@
                       id: this._streamMsgId,
                       room_id: msg.room_id,
                       sender_id: 'ai-assistant',
-                      sender_name: 'AI Assistant',
+                      sender_name: this.state.activeRoom?.ai_name || 'AI Assistant',
                       content: this._streamContent,
                       mentions: [],
                       is_ai: true,
@@ -301,6 +304,9 @@
         } catch (e) {
           console.error('Failed to load rooms:', e)
         }
+
+        // Process any pending invite token
+        await this.processInviteToken()
       },
 
       handleLogin(data) {
@@ -381,6 +387,45 @@
         this.update({ messages: [], showClearModal: false })
       },
 
+      /** Check URL for /invite/:token and stash it for after login if needed */
+      checkPendingInvite() {
+        const match = window.location.pathname.match(/^\/invite\/(.+)$/)
+        if (match) {
+          sessionStorage.setItem('pendingInvite', match[1])
+          // Clean URL so it doesn't confuse things
+          window.history.replaceState(null, '', '/')
+        }
+      },
+
+      /** Accept an invite token — called after login + rooms load */
+      async processInviteToken() {
+        // Check URL first, then sessionStorage (for post-login flow)
+        let token = null
+        const urlMatch = window.location.pathname.match(/^\/invite\/(.+)$/)
+        if (urlMatch) {
+          token = urlMatch[1]
+          window.history.replaceState(null, '', '/')
+        } else {
+          token = sessionStorage.getItem('pendingInvite')
+        }
+
+        if (!token) return
+        sessionStorage.removeItem('pendingInvite')
+
+        try {
+          const result = await api.acceptInvite(token)
+          // Refresh room list — the accepted room should now appear
+          const rooms = await api.listRooms()
+          this.update({ rooms })
+          // Auto-select the room the user just joined
+          if (result?.room_id) {
+            this.selectRoom(result.room_id)
+          }
+        } catch (e) {
+          console.error('Failed to accept invite:', e)
+        }
+      },
+
       scrollToBottom() {
         requestAnimationFrame(() => {
           const container = document.querySelector('.messages-list')

client/src/components/chat-room.riot

@@ -4,9 +4,18 @@
     <header class="room-header">
       <div class="room-header-info">
         <h3>{props.room?.name}</h3>
-        <span class="room-meta">
+        <button class="members-toggle" onclick={toggleMembers}>
-          {props.room?.model_id?.split('/').pop()} &middot; {props.room?.members?.length || 0} members
+          <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-        </span>
+            <path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/>
+            <circle cx="9" cy="7" r="4"/>
+            <path d="M23 21v-2a4 4 0 0 0-3-3.87"/>
+            <path d="M16 3.13a4 4 0 0 1 0 7.75"/>
+          </svg>
+          {(props.room?.members?.length || 0) + 1} members
+          <svg class={'members-chevron ' + (state.showMembers ? 'open' : '')} width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+            <polyline points="6 9 12 15 18 9"/>
+          </svg>
+        </button>
       </div>
       <div class="room-actions">
         <button class="btn btn-ghost btn-icon" onclick={props.cbInvite} title="Invite">
@@ -28,6 +37,28 @@
           </svg>
         </button>
       </div>
+
+      <!-- Member list dropdown -->
+      <div if={state.showMembers} class="members-dropdown">
+        <div class="member-item ai-member">
+          <div class="member-avatar ai-avatar">
+            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+              <rect x="4" y="8" width="16" height="12" rx="2"/>
+              <line x1="12" y1="2" x2="12" y2="8"/>
+              <circle cx="12" cy="2" r="1" fill="currentColor"/>
+              <circle cx="9" cy="14" r="1.5" fill="currentColor"/>
+              <circle cx="15" cy="14" r="1.5" fill="currentColor"/>
+            </svg>
+          </div>
+          <span class="member-name">{props.room?.ai_name || 'AI Assistant'}</span>
+          <span class="member-role ai-role">AI</span>
+        </div>
+        <div each={member in props.room?.members} key={member.id} class="member-item">
+          <div class="member-avatar">{member.display_name?.charAt(0).toUpperCase()}</div>
+          <span class="member-name">{member.display_name}</span>
+          <span if={member.id === props.room?.created_by} class="member-role">Owner</span>
+        </div>
+      </div>
     </header>
 
     <!-- Messages -->
@@ -51,7 +82,15 @@
 
       <!-- AI typing indicator (only when NOT streaming content) -->
       <div if={props.aiTyping && !props.streamingMessage} class="typing-indicator ai-typing">
-        <div class="typing-avatar ai-avatar">AI</div>
+        <div class="typing-avatar ai-avatar">
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+            <rect x="4" y="8" width="16" height="12" rx="2"/>
+            <line x1="12" y1="2" x2="12" y2="8"/>
+            <circle cx="12" cy="2" r="1" fill="currentColor"/>
+            <circle cx="9" cy="14" r="1.5" fill="currentColor"/>
+            <circle cx="15" cy="14" r="1.5" fill="currentColor"/>
+          </svg>
+        </div>
         <template if={props.aiToolStatus}>
           <span class="tool-status-text">
             {props.aiToolStatus.tool === 'brave_search' ? '🔍 Searching...' : props.aiToolStatus.tool === 'web_fetch' ? '🌐 Reading page...' : '⚙️ Using tool...'}
@@ -75,7 +114,7 @@
         <textarea
           ref="input"
           class="message-input"
-          placeholder="Type a message... (use @ai to mention the AI)"
+          placeholder={'Type a message... (use @ai or @' + (props.room?.ai_name || 'AI') + ')'}
           rows="1"
           oninput={handleInput}
           onkeydown={handleKeydown}
@@ -109,6 +148,7 @@
       height: var(--header-height);
       border-bottom: 1px solid var(--border);
       background: var(--bg-secondary);
+      position: relative;
     }
 
     .room-header-info h3 {
@@ -116,9 +156,99 @@
       font-weight: 600;
     }
 
-    .room-meta {
+    .members-toggle {
-      font-size: var(--text-xs);
+      background: none;
+      border: none;
       color: var(--text-muted);
+      font-size: var(--text-xs);
+      cursor: pointer;
+      display: inline-flex;
+      align-items: center;
+      gap: 4px;
+      padding: 2px 6px;
+      border-radius: var(--radius-sm);
+      transition: all var(--transition-fast);
+    }
+
+    .members-toggle:hover {
+      color: var(--text-secondary);
+      background: var(--bg-hover);
+    }
+
+    .members-chevron {
+      transition: transform 0.15s;
+    }
+
+    .members-chevron.open {
+      transform: rotate(180deg);
+    }
+
+    .members-dropdown {
+      position: absolute;
+      top: 100%;
+      left: var(--space-lg);
+      background: var(--bg-tertiary);
+      border: 1px solid var(--border);
+      border-radius: var(--radius-md);
+      padding: var(--space-xs) 0;
+      min-width: 200px;
+      max-width: 280px;
+      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
+      z-index: 20;
+      animation: fadeIn 0.15s ease;
+    }
+
+    @keyframes fadeIn {
+      from { opacity: 0; }
+      to { opacity: 1; }
+    }
+
+    .member-item {
+      display: flex;
+      align-items: center;
+      gap: var(--space-sm);
+      padding: var(--space-xs) var(--space-md);
+    }
+
+    .member-avatar {
+      width: 28px;
+      height: 28px;
+      border-radius: var(--radius-full);
+      background: var(--bg-elevated);
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      font-weight: 600;
+      font-size: var(--text-xs);
+      color: var(--text-secondary);
+      flex-shrink: 0;
+    }
+
+    .member-item .ai-avatar {
+      background: var(--accent);
+      color: white;
+    }
+
+    .member-name {
+      font-size: var(--text-sm);
+      color: var(--text-primary);
+      flex: 1;
+      white-space: nowrap;
+      overflow: hidden;
+      text-overflow: ellipsis;
+    }
+
+    .member-role {
+      font-size: 11px;
+      color: var(--text-muted);
+      background: var(--bg-elevated);
+      padding: 1px 6px;
+      border-radius: var(--radius-sm);
+    }
+
+    .ai-role {
+      color: var(--accent);
+      background: rgba(108, 92, 231, 0.15);
     }
 
     .room-actions {
@@ -288,6 +418,25 @@
       state: {
         inputValue: '',
         typingDisplay: '',
+        showMembers: false,
+      },
+
+      onMounted() {
+        this._closeMembers = (e) => {
+          if (this.state.showMembers && !this.$('.members-toggle')?.contains(e.target) && !this.$('.members-dropdown')?.contains(e.target)) {
+            this.update({ showMembers: false })
+          }
+        }
+        document.addEventListener('click', this._closeMembers)
+      },
+
+      onUnmounted() {
+        document.removeEventListener('click', this._closeMembers)
+      },
+
+      toggleMembers(e) {
+        e.stopPropagation()
+        this.update({ showMembers: !this.state.showMembers })
       },
 
       onUpdated() {
@@ -343,9 +492,11 @@
           return
         }
 
-        // Extract mentions (simple @ai detection)
+        // Extract mentions (@ai or @{aiName} detection)
         const mentions = []
-        if (content.toLowerCase().includes('@ai')) {
+        const lc = content.toLowerCase()
+        const aiName = this.props.room?.ai_name?.toLowerCase() || ''
+        if (lc.includes('@ai') || (aiName && lc.includes(`@${aiName}`))) {
           mentions.push('ai-assistant')
         }
 

client/src/components/create-room-modal.riot

@@ -95,6 +95,19 @@
           ></textarea>
         </div>
 
+        <div class="form-group">
+          <label for="ai-name">AI Agent Name</label>
+          <input
+            type="text"
+            id="ai-name"
+            placeholder="e.g., Nova, Atlas, Sage..."
+            value={state.ai_name}
+            oninput={e => update({ ai_name: e.target.value })}
+            maxlength="20"
+          />
+          <span class="help-text">The AI's display name in this room</span>
+        </div>
+
         <div class="modal-actions">
           <button type="button" class="btn btn-ghost" onclick={props.cbClose}>Cancel</button>
           <button type="submit" class="btn btn-primary">Create Room</button>
@@ -343,6 +356,7 @@
         model_id: 'anthropic/claude-sonnet-4',
         ai_always_respond: false,
         system_prompt: 'You are a helpful AI assistant participating in a group chat. Be conversational, helpful, and concise.',
+        ai_name: '',
         models: [],
         loadingModels: true,
         showPicker: false,
@@ -350,6 +364,8 @@
       },
 
       onMounted() {
+        const aiNames = ['Nova', 'Atlas', 'Sage', 'Echo', 'Pixel', 'Cosmo', 'Ember', 'Flux', 'Lyra', 'Onyx']
+        this.update({ ai_name: aiNames[Math.floor(Math.random() * aiNames.length)] })
         this.fetchModels()
         // Close picker on outside click
         this._onDocClick = (e) => {
@@ -430,6 +446,7 @@
           model_id: this.state.model_id,
           ai_always_respond: this.state.ai_always_respond,
           system_prompt: this.state.system_prompt,
+          ai_name: this.state.ai_name,
         })
       },
     }

client/src/components/message-bubble.riot

@@ -2,7 +2,14 @@
   <div class={'message ' + (props.message?.is_ai ? 'ai-message' : '') + (props.isOwn ? ' own-message' : '')}>
     <div if={!props.isOwn} class="message-avatar-col">
       <div class={'message-avatar ' + (props.message?.is_ai ? 'ai-avatar' : '')}>
-        {props.message?.is_ai ? 'AI' : props.message?.sender_name?.charAt(0).toUpperCase()}
+        <svg if={props.message?.is_ai} width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <rect x="4" y="8" width="16" height="12" rx="2"/>
+          <line x1="12" y1="2" x2="12" y2="8"/>
+          <circle cx="12" cy="2" r="1" fill="currentColor"/>
+          <circle cx="9" cy="14" r="1.5" fill="currentColor"/>
+          <circle cx="15" cy="14" r="1.5" fill="currentColor"/>
+        </svg>
+        <template if={!props.message?.is_ai}>{props.message?.sender_name?.charAt(0).toUpperCase()}</template>
       </div>
     </div>
     <div class="message-body">

server/migrations/004_ai_name.sql

@@ -0,0 +1,2 @@
+-- Add AI agent name to rooms
+ALTER TABLE rooms ADD COLUMN ai_name TEXT NOT NULL DEFAULT 'AI Assistant';

server/src/handlers/invites.rs

@@ -63,11 +63,16 @@ pub async fn create_invite(
     }))
 }
 
+#[derive(serde::Serialize)]
+pub struct AcceptInviteResponse {
+    pub room_id: String,
+}
+
 pub async fn accept_invite(
     State(state): State<Arc<AppState>>,
     auth: AuthUser,
     Path(token): Path<String>,
-) -> Result<StatusCode, (StatusCode, String)> {
+) -> Result<Json<AcceptInviteResponse>, (StatusCode, String)> {
     let invite = sqlx::query_as::<_, (String, String, bool)>(
         "SELECT id, room_id, used FROM invites WHERE token = ?",
     )
@@ -111,5 +116,5 @@ pub async fn accept_invite(
         .await
         .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
 
-    Ok(StatusCode::OK)
+    Ok(Json(AcceptInviteResponse { room_id }))
 }

server/src/handlers/rooms.rs

@@ -20,7 +20,7 @@ pub async fn create_room(
     let room_id = Uuid::new_v4().to_string();
 
     sqlx::query(
-        "INSERT INTO rooms (id, name, model_id, created_by, ai_always_respond, system_prompt) VALUES (?, ?, ?, ?, ?, ?)",
+        "INSERT INTO rooms (id, name, model_id, created_by, ai_always_respond, system_prompt, ai_name) VALUES (?, ?, ?, ?, ?, ?, ?)",
     )
     .bind(&room_id)
     .bind(&body.name)
@@ -28,6 +28,7 @@ pub async fn create_room(
     .bind(&auth.user_id)
     .bind(body.ai_always_respond)
     .bind(&body.system_prompt)
+    .bind(&body.ai_name)
     .execute(&state.db)
     .await
     .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
@@ -47,6 +48,7 @@ pub async fn create_room(
         created_by: auth.user_id.clone(),
         ai_always_respond: body.ai_always_respond,
         system_prompt: body.system_prompt,
+        ai_name: body.ai_name,
         created_at: chrono::Utc::now().to_rfc3339(),
         members: vec![UserPublic {
             id: auth.user_id,
@@ -85,6 +87,7 @@ pub async fn list_rooms(
             created_by: room.created_by,
             ai_always_respond: room.ai_always_respond,
             system_prompt: room.system_prompt,
+            ai_name: room.ai_name,
             created_at: room.created_at,
             members: members
                 .into_iter()
@@ -141,6 +144,7 @@ pub async fn get_room(
         created_by: room.created_by,
         ai_always_respond: room.ai_always_respond,
         system_prompt: room.system_prompt,
+        ai_name: room.ai_name,
         created_at: room.created_at,
         members: members
             .into_iter()

server/src/handlers/ws.rs

@@ -197,14 +197,14 @@ async fn handle_send_message(
     let should_respond = mentions.contains(&ai_user_id.to_string());
 
     // Also check room settings for ai_always_respond
-    let room = sqlx::query_as::<_, (String, bool, String)>(
+    let room = sqlx::query_as::<_, (String, bool, String, String)>(
-        "SELECT model_id, ai_always_respond, system_prompt FROM rooms WHERE id = ? AND deleted_at IS NULL",
+        "SELECT model_id, ai_always_respond, system_prompt, ai_name FROM rooms WHERE id = ? AND deleted_at IS NULL",
     )
     .bind(room_id)
     .fetch_optional(&state.db)
     .await;
 
-    let (model_id, always_respond, system_prompt) = match room {
+    let (model_id, always_respond, system_prompt, ai_name) = match room {
         Ok(Some(r)) => r,
         _ => return,
     };
@@ -390,7 +390,7 @@ async fn handle_send_message(
     .bind(&ai_msg_id)
     .bind(room_id)
     .bind(ai_user_id)
-    .bind("AI Assistant")
+    .bind(&ai_name)
     .bind(&ai_response)
     .bind(&ai_now)
     .bind(&ai_meta_json)
@@ -402,7 +402,7 @@ async fn handle_send_message(
         id: ai_msg_id,
         room_id: room_id.to_string(),
         sender_id: ai_user_id.to_string(),
-        sender_name: "AI Assistant".to_string(),
+        sender_name: ai_name.clone(),
         content: ai_response,
         mentions: vec![],
         is_ai: true,

server/src/main.rs

@@ -70,6 +70,16 @@ async fn main() {
         Err(e) => panic!("Failed to run migration 003: {}", e),
     }
 
+    // Run migration 004 - ai_name on rooms
+    let migration_004 = include_str!("../migrations/004_ai_name.sql");
+    match sqlx::raw_sql(migration_004).execute(&db).await {
+        Ok(_) => tracing::info!("Migration 004 applied"),
+        Err(e) if e.to_string().contains("duplicate column") => {
+            tracing::debug!("Migration 004 already applied, skipping");
+        }
+        Err(e) => panic!("Failed to run migration 004: {}", e),
+    }
+
     tracing::info!("Database initialized");
 
     let (tx, _rx) = broadcast::channel::<models::BroadcastEvent>(4096);

server/src/models/mod.rs

@@ -19,6 +19,7 @@ pub struct Room {
     pub created_by: String,
     pub ai_always_respond: bool,
     pub system_prompt: String,
+    pub ai_name: String,
     pub created_at: String,
     pub deleted_at: Option<String>,
 }
@@ -83,6 +84,20 @@ pub struct CreateRoomRequest {
     pub ai_always_respond: bool,
     #[serde(default = "default_system_prompt")]
     pub system_prompt: String,
+    #[serde(default = "default_ai_name")]
+    pub ai_name: String,
+}
+
+fn default_ai_name() -> String {
+    let names = [
+        "Nova", "Atlas", "Sage", "Echo", "Pixel",
+        "Cosmo", "Ember", "Flux", "Lyra", "Onyx",
+    ];
+    let idx = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_millis() as usize % names.len())
+        .unwrap_or(0);
+    names[idx].to_string()
 }
 
 fn default_system_prompt() -> String {
@@ -97,6 +112,7 @@ pub struct RoomResponse {
     pub created_by: String,
     pub ai_always_respond: bool,
     pub system_prompt: String,
+    pub ai_name: String,
     pub created_at: String,
     pub members: Vec<UserPublic>,
 }