Respond gracefully to mcp/addServer and mcp/removeServer

The remote ECA server doesn't expose REST endpoints for add/remove
(both mutate a config file on the host), so reply with a typed
'not_supported' error so the React AddServerForm surfaces it inline
instead of hanging.

Author: ericdallo

src/bridge/outbound-handler.ts

@@ -204,6 +204,24 @@ export async function handleOutbound(
         }
         break;
 
+      case 'mcp/addServer':
+      case 'mcp/removeServer':
+        // The remote ECA server doesn't expose REST endpoints for
+        // add/remove (these mutate a config file on the host running the
+        // server). Respond with an error-shaped payload so the form in
+        // the React webview surfaces a clear "not supported" message
+        // inline instead of spinning forever.
+        if (data.requestId) {
+          dispatch(type, {
+            requestId: data.requestId,
+            error: {
+              code: 'not_supported',
+              message: 'Adding/removing MCP servers is not available in the web client.',
+            },
+          });
+        }
+        break;
+
       // --- Background Jobs ---
       case 'jobs/list': {
         const jobsResult = await api.jobsList();

src/bridge/types.ts

@@ -268,6 +268,8 @@ export type OutboundMessage =
   | { type: 'mcp/connectServer'; data: { name: string } }
   | { type: 'mcp/logoutServer'; data: { name: string } }
   | { type: 'mcp/updateServer'; data: { requestId?: string } }
+  | { type: 'mcp/addServer'; data: { requestId?: string; name: string; [k: string]: unknown } }
+  | { type: 'mcp/removeServer'; data: { requestId?: string; name: string } }
   | { type: 'server/setTrust'; data: boolean }
   | { type: 'jobs/list'; data: { requestId?: string } }
   | { type: 'jobs/readOutput'; data: { requestId?: string; jobId: string } }
@@ -332,6 +334,9 @@ export type DispatchType =
   | 'server/setTrust'
   | 'config/updated'
   | 'tool/serversUpdated'
+  | 'tool/serverRemoved'
+  | 'mcp/addServer'
+  | 'mcp/removeServer'
   | 'chat/contentReceived'
   | 'chat/cleared'
   | 'chat/deleted'