SSE MCP Server Deployment Not Working With Inspector

Apr 29, 2025 by ADMIN 53 views

Introduction

In this article, we will explore the issue of deploying an SSE MCP server using the Cloudflare Remote MCP Server Guide and accessing it using the Inspector. We will walk through the steps to deploy the example GitHub MCP server with authentication and troubleshoot the common errors encountered during the process.

Prerequisites

Before we begin, make sure you have the following:

A Cloudflare account
A GitHub account
The Cloudflare Workers SDK installed on your laptop
The Inspector repo cloned on your laptop

Step 1: Deploy the Example GitHub MCP Server

To deploy the example GitHub MCP server with authentication, follow these steps:

Clone the project from the GitHub repo: https://github.com/modelcontextprotocol/inspector
Run the following command to deploy the server: npx wrangler@latest deploy

Step 2: Troubleshooting the Error

However, you may encounter the following error:

Durable Objects:
- MCP_OBJECT: MyMCP
KV Namespaces:
- OAUTH_KV:
AI:
- Name: AI

X [ERROR] A request to the Cloudflare API (/accounts/2d2703fe97719370b4a65ebe39991b7a/workers/scripts/my-mcp-server-github-auth) failed.

KV namespace '' is not valid. [code: 10042]

If you think this is a bug, please open an issue at: https://github.com/cloudflare/workers-sdk/issues/new/choose

Step 3: Creating a New KV Namespace

To fix this error, run the following command to create a new KV namespace:

npx wrangler kv:namespace create OAUTH_KV

This will return a response with the new KV ID:

{
  "kv_namespaces": [
    {
      "binding": "OAUTH_KV",
      "id": "b08e900ad4f2428da447438f5d29d256"
    }
  ]
}

Step 4: Updating the Wrangler Configuration

Update the wrangler.jsonc file with the new KV ID:

{
  "name": "my-mcp-server-github-auth",
  "description": "My MCP server with GitHub authentication",
  "kv_namespaces": [
    {
      "binding": "OAUTH_KV",
      "id": "b08e900ad4f2428da447438f5d29d256"
    }
  ]
}

Step 5: Deploying the Server Again

Run the following command to deploy the server again:

npx wrangler@latest deploy

Step 6: Accessing the Server using the Inspector

After deploying the server, update the environment configuration with the new KV ID:

Now, when you paste the deployed URL in the Inspector, it should give an error:

Conclusion

In this article, we walked through the steps to deploy an SSE MCP server using the Cloudflare Remote MCP Server Guide and accessed it using the Inspector. We troubleshooted the common errors encountered during the process and provided a step-by-step guide to resolve them. By following these steps, you should be able to deploy your own SSE MCP server with authentication and access it using the Inspector.

Additional Resources

For more information on Cloudflare Workers and the Inspector, please refer to the following resources:

Cloudflare Workers Documentation: https://developers.cloudflare.com/workers/
Inspector Documentation: https://developers.cloudflare.com/inspect/
Cloudflare Remote MCP Server Guide: https://developers.cloudflare.com/agents/guides/remote-mcp-server/
SSE MCP Server Deployment Not Working with Inspector: Q&A ================================================================

Q: What is the Cloudflare Remote MCP Server Guide?

A: The Cloudflare Remote MCP Server Guide is a documentation provided by Cloudflare that outlines the steps to deploy a remote MCP server using Cloudflare Workers.

Q: What is the Inspector?

A: The Inspector is a tool provided by Cloudflare that allows you to inspect and debug your Cloudflare Workers applications.

Q: What is the error message "KV namespace '' is not valid" mean?

A: This error message indicates that the KV namespace ID provided in the wrangler.jsonc file is not valid. This can be resolved by creating a new KV namespace using the npx wrangler kv:namespace create command.

Q: How do I create a new KV namespace?

A: To create a new KV namespace, run the following command:

npx wrangler kv:namespace create OAUTH_KV

This will return a response with the new KV ID.

Q: How do I update the `wrangler.jsonc` file with the new KV ID?

A: To update the wrangler.jsonc file with the new KV ID, add the following code to the file:

{
  "name": "my-mcp-server-github-auth",
  "description": "My MCP server with GitHub authentication",
  "kv_namespaces": [
    {
      "binding": "OAUTH_KV",
      "id": "b08e900ad4f2428da447438f5d29d256"
    }
  ]
}

Replace the b08e900ad4f2428da447438f5d29d256 with the actual KV ID returned from the npx wrangler kv:namespace create command.

Q: How do I deploy the server again after updating the `wrangler.jsonc` file?

A: To deploy the server again, run the following command:

npx wrangler@latest deploy

Q: What is the error message "A request to the Cloudflare API (/accounts/2d2703fe97719370b4a65ebe39991b7a/workers/scripts/my-mcp-server-github-auth) failed" mean?

A: This error message indicates that there is an issue with the Cloudflare API request. This can be resolved by checking the wrangler.jsonc file and the KV namespace ID.

Q: How do I access the server using the Inspector?

A: To access the server using the Inspector, update the environment configuration with the new KV ID:

Then, paste the deployed URL in the Inspector:

Q: What are some common issues that can occur during deployment?

A: Some common issues that can occur during deployment include:

Invalid KV namespace ID Incorrect wrangler.jsonc file configuration
Issues with the Cloudflare API request

Q: How do I troubleshoot common issues during deployment?

A: To troubleshoot common issues during deployment, follow these steps:

Check the wrangler.jsonc file for any errors or inconsistencies.
Verify that the KV namespace ID is correct.
Check the Cloudflare API request for any errors or issues.

By following these steps and troubleshooting common issues, you should be able to deploy your SSE MCP server with authentication and access it using the Inspector.