⏳ refactor: MCP OAuth Polling with Gradual Backoff and Timeout Handling (#9752)

* refactor: Implement gradual backoff polling for oauth connection status with timeout handling

* refactor: Enhance OAuth polling with gradual backoff and timeout handling; update reconnection tracking

* refactor: reconnection timeout behavior in OAuthReconnectionManager and OAuthReconnectionTracker

- Implement tests to verify reconnection timeout handling, including tracking of reconnection states and cleanup of timed-out entries.
- Enhance existing methods in OAuthReconnectionManager and OAuthReconnectionTracker to support timeout checks and cleanup logic.
- Ensure proper handling of multiple servers with different timeout periods and edge cases for active states.

* chore: remove comment

* refactor: Enforce strict 3-minute OAuth timeout with updated polling intervals and improved timeout handling

* refactor: Remove unused polling logic and prevent duplicate polling for servers in MCP server manager

* refactor: Update localization key for no memories message in MemoryViewer

* refactor: Improve MCP tool initialization by handling server failures

- Introduced a mechanism to track failed MCP servers, preventing retries for unavailable servers.
- Added logging for failed tool creation attempts to enhance debugging and monitoring.

* refactor: Update reconnection timeout to enforce a strict 3-minute limit

* ci: Update reconnection timeout tests to reflect a strict 3-minute limit

* ci: Update reconnection timeout tests to enforce a strict 3-minute limit

* chore: Remove unused MCP connection timeout message

api/app/clients/tools/util/handleTools.js

@@ -409,12 +409,16 @@ Current Date & Time: ${replaceSpecialVars({ text: '{{iso_datetime}}' })}
   const mcpToolPromises = [];
   /** MCP server tools are initialized sequentially by server */
   let index = -1;
+  const failedMCPServers = new Set();
   for (const [serverName, toolConfigs] of Object.entries(requestedMCPTools)) {
     index++;
     /** @type {LCAvailableTools} */
     let availableTools;
     for (const config of toolConfigs) {
       try {
+        if (failedMCPServers.has(serverName)) {
+          continue;
+        }
         const mcpParams = {
           res: options.res,
           userId: user,
@@ -458,6 +462,11 @@ Current Date & Time: ${replaceSpecialVars({ text: '{{iso_datetime}}' })}
           loadedTools.push(...mcpTool);
         } else if (mcpTool) {
           loadedTools.push(mcpTool);
+        } else {
+          failedMCPServers.add(serverName);
+          logger.warn(
+            `MCP tool creation failed for "${config.toolKey}", server may be unavailable or unauthenticated.`,
+          );
         }
       } catch (error) {
         logger.error(`Error loading MCP tool for server ${serverName}:`, error);