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Troubleshooting

Updated on Jun 24, 2026

This article provides solutions to common issues you may encounter when working with the Kendo UI for Angular AI Tools.

AI Coding Assistant Stopped Working

Starting in February 2026, we restructured the Kendo UI for Angular AI Tools to better serve different user needs by deprecating the AI Coding Assistant. The Kendo UI for Angular MCP server now provides a single workflow centered around the Agentic UI Generator tool and its specialized MCP assistants.

As part of this restructuring, license requirements have also changed.

All active Telerik subscription licenses—Provide access to the Agentic UI Generator.
Trial licenses—Provide access during the active trial period.
Perpetual licenses—Do not grant access to the AI tools. You must have an active Subscription or trial license to use the Kendo UI for Angular MCP server.

Telerik Subscription licenses were introduced in 2025 and they explicitly contain the word "Subscription" in their name, for example:

DevCraft Ultimate Subscription

DevCraft Complete Subscription

DevCraft UI Subscription

Kendo UI for Angular Subscription

An automatically renewing license is not necessarily a Subscription license. The following licenses are Perpetual and they use a legacy naming scheme. These are not Subscription licenses:

DevCraft Ultimate with Subscription and Ultimate Support

DevCraft Complete with Subscription and Priority Support

DevCraft UI with Subscription and Lite Support

I Started a Trial License but Cannot Activate the MCP Server

When you activate a trial license, you must download and install the updated license key to enable access to the AI Tools. To resolve this issue:

Download your trial license key from your Telerik account.
Install or update the license key in your development environment.
Restart your IDE to ensure the changes take effect.
Start the MCP server.

The MCP server validates your license during initialization. Without a properly installed trial license key, the server cannot authenticate your access to the AI Tools.

The MCP Server Assistants Are Not Recognized by VS Code

If the Kendo UI for Angular MCP server assistants are not available or recognized by GitHub Copilot in VS Code, you may need to manually enable them:

In the bottom right of the Copilot chat window, click Configure Tools.
In the popup, check the kendo-angular-mcp-server from the list to enable it.

The MCP Server Start Button Is Missing

If the MCP server start button is not visible and displays an error message instead, this typically indicates a licensing or configuration issue.

To resolve this:

Verify your license—Ensure you have an active Subscription or trial license. Perpetual licenses do not grant access to the AI Tools.
Verify the MCP server configuration—Ensure the MCP server is properly configured in your VS Code settings as described in the Installation guide.
Restart your IDE—Close and reopen VS Code to ensure all changes take effect.

If the issue persists after following these steps, check your license status in your Telerik account to confirm it's active and includes access to the AI Tools.

The MCP Server Cannot Establish a Connection

The Kendo UI for Angular MCP server uses gRPC, which requires HTTP/2. If the client device does not support HTTP/2 or the protocol is disabled or blocked by a firewall or proxy in the network, the following error occurs:

Error: 14 UNAVAILABLE: No connection established. Last error: Protocol error

In this case, ensure that HTTP/2 is enabled on the client device and on any firewalls or proxy servers that manage the network requests. If you are on a corporate network, contact your IT team to verify that HTTP/2 traffic is allowed.

AI Plugin and MCP Server Running Simultaneously

The kendo-angular-plugin and the Kendo UI for Angular MCP server are two alternative ways to connect your agent to Kendo UI for Angular—they are mutually exclusive. The plugin comes with its own predefined MCP server configuration tuned for skills, so if you already have the MCP server configured in your IDE, you must disable or remove it before installing the plugin.

Running both at the same time can cause the following issues:

Tool vs. skill confusion—The MCP server exposes a kendo_ui_generator tool. The plugin intentionally disables that tool and provides a kendo-angular-ui-generator skill instead, to avoid ambiguity. When the MCP server is also active, that protection no longer works and the agent may be unsure which entry point to use.
Duplicated context—MCP tools carry static context that is injected into the model on every invocation. The plugin replaces this with skills that are loaded on demand. If both configurations are active, the agent receives both the skill instructions and the tool's static context—duplicate information that leads to higher token usage and inconsistent responses.
Double invocation—When both are present, the agent may read the plugin skill and then also call the MCP tool. The result is even more context, more confusion, and less predictable output.

Resolution:

Disable or remove the Kendo UI for Angular MCP server configuration from your IDE before using the plugin. For example, for VS Code, remove or comment out the kendo-angular-mcp-server entry from your .vscode/mcp.json or user-level mcp.json file. Then, reload the window (Developer: Reload Window) before starting a new session.