mcp-server logs to stdout causing JSON parsing errors with MCP clients

[ChristianConato]

Hello cheqd team,

I am trying to use the mcp-toolkit with an MCP client (Anthropic's Claude) and I'm running into a communication issue. The mcp-server prints informational logs to stdout, which violates the MCP specification requiring stdout to be used exclusively for JSON-RPC messages. This causes the client to fail when trying to parse the non-JSON output.
I particular the error is:

Environment

• Operating System: Windows
• Client: Anthropic Claude
• mcp-toolkit version: Cloned from the main branch on 2025-06-22
• I'm using the docker method

Steps to Reproduce:

1. Clone the repository: git clone https://github.com/cheqd/mcp-toolkit.git
2. Set up the claude_desktop_config.json for the client to run the server via Docker Compose using the following code fragment

"cheqd": { "command": "docker", "args": [ "compose", "-f", "/path/to/repo/mcp-toolkit/docker/docker-compose.yml", "run", "--rm", "-p", "3000:3000", "--name", "faber", "-T", "mcp-server" ] }

Thank you for your work on this great toolkit!

[sownak]

@ChristianConato Thanks for reporting this. The issue has been fixed, you can test with docker image ghcr.io/cheqd/mcp-toolkit:staging-latest in docker-compose file

[cheqd-bot]

🎉 This issue has been resolved in version 1.5.0-develop.2 🎉

The release is available on npm package (@beta dist-tag)

Your semantic-release bot 📦🚀

[cheqd-bot]

🎉 This issue has been resolved in version 1.4.0-develop.2 🎉

The release is available on npm package (@beta dist-tag)

Your semantic-release bot 📦🚀

[cheqd-bot]

🎉 This issue has been resolved in version 1.3.0-develop.2 🎉

The release is available on npm package (@beta dist-tag)

Your semantic-release bot 📦🚀

[ChristianConato]

I downloaded the correct image version from ghcr.io/cheqd/mcp-toolkit:staging-latest and the previous problem has been solved but this time the issue is related to these two screenshots after performing all the actions (I modified the .env and the docker-compose.yml):

It seems that it can connect to port 5000 but after a minute a timeout occurs

[sownak]

@ChristianConato Can you have a try with the latest developer release? We have updated the readme and docker-compose