Chatting fails with `No valid session ID provided` provided error.

[sangee2004]

Describe the bug
Chatting fails with No valid session ID provided provided error.

Environment: local docker install
Consistently Reproduces: No
Additional environments attempted in: Not attempted in main yet

Note I do not have steps to reproduce this issue. I am providing the steps that i had done in this setup before i ecounterd this problem

To Reproduce
Steps to reproduce the behavior:

1. Had a project with Antv Chart and Outlook MCP servers and was able to chat successfully with both MCP servers with tool calls succeeding

After few hours , when I tried to chat in this project , I am starting to see the following errors:

Following errors seen in obot logs

error│ failed to restart SSE: failed to restart SSE: failed to connect to SSE server url https://outlook-mcp.obot.ai/mcp: 400 Bad Request, Bad Request: No valid session ID provided
time="2025-11-04T18:25:11Z" level=error msg="Failed to send resources/list message to server ms1ddq6g: failed to send request: failed to send message: 400 Bad Request: Bad Request: No valid session ID provided" logger=/app/pkg/api/handlers/mcpgateway/handler.go
time="2025-11-04T18:25:11Z" level=info msg="Handling request: method POST, path /credentials/reveal" id=6be92ac6-e1d8-4fc1-94f1-b5f90b8eb90d
time="2025-11-04T18:25:11Z" level=info msg="Handled request: method POST, path /credentials/reveal" id=6be92ac6-e1d8-4fc1-94f1-b5f90b8eb90d
error│ failed to restart SSE: failed to restart SSE: failed to connect to SSE server url https://outlook-mcp.obot.ai/mcp: 400 Bad Request, Bad Request: No valid session ID providedtime="2025-11-04T18:25:11Z" level=error msg="Failed to send tools/list message to server ms1ddq6g: failed to send request: failed to send message: 400 Bad Request: Bad Request: No valid session ID provided" logger=/app/pkg/api/handlers/mcpgateway/handler.go

listing tools for outlook MCP sever also fails with the same error.

time="2025-11-04T00:32:52Z" level=error msg="Failed to send tools/list message to server ms1ddq6g: failed to send request: failed to send message: 400 Bad Request: Bad Request: No valid session ID provided" logger=/app/pkg/api/handlers/mcpgateway/handler.go
error│ failed to restart SSE: failed to restart SSE: failed to connect to SSE server url https://outlook-mcp.obot.ai/mcp: 400 Bad Request, Bad Request: No valid session ID provided`

Able to still work with Antv Chart` MCP server.

Note
I have another project with Outlook MCP server ( a new instance) in which I dont see this problem. I am able to continue to use this instance even after 18 hours.

[sangee2004]

With @thedadams's suggestion , i am able to reproduce this issue in main with following steps

1. Chat with Outlook MCP server
2. Restart outlook server pod ( Donnie did this )
3. Try to chat with Outlook MCP server (from step1)
   Chat fails with No valid session ID provided error

[cjellick]

caused by: modelcontextprotocol/python-sdk#1004
pr:. modelcontextprotocol/python-sdk#1417