Persistent Internal Server Error — MCP server fails to reconnect mid-session

[geekybaiyi]

Description

The Notion plugin (notion@claude-plugins-official, v0.1.0) fails to connect with an "Internal Server Error" after disconnecting mid-session. Multiple attempts to reconnect, re-authenticate, and reinstall have not resolved it.

Steps to Reproduce

1. Notion plugin was working earlier in the session — tools like notion-search, notion-create-pages, notion-fetch, notion-update-page all functioned correctly (~30+ successful API calls)
2. After some time, the Notion MCP server disconnected without any user action
3. Ran /mcp multiple times — Notion server fails to reconnect with "Internal Server Error"
4. Uninstalled and reinstalled the plugin:

   claude plugin uninstall notion@claude-plugins-official --scope user
   claude plugin install notion@claude-plugins-official --scope user
   

5. Ran /mcp again — still "Internal Server Error"
6. No auth prompt appears — it fails before reaching authentication

Environment

• OS: macOS (Darwin 24.3.0)
• Claude Code: latest
• Plugin: notion@claude-plugins-official v0.1.0
• Scope: user
• Other plugins working: Slack (slack@claude-plugins-official), Atlassian (atlassian@claude-plugins-official), Google Calendar — all remain connected in the same session

What Worked Before Disconnect

These tools were all functional earlier in the session:

• notion-search (scoped to specific collections)
• notion-create-pages (batch creation with templates, relations, dates)
• notion-fetch (page content retrieval)
• notion-update-page (both replace_content and update_content commands)

Expected Behavior

Notion MCP server should reconnect and authenticate successfully after /mcp.

Actual Behavior

"Internal Server Error" on every connection attempt. The error occurs before any auth flow — suggests a server-side issue rather than a client/auth problem.

Related

Also reported at anthropics/claude-code#48243

[jericho1050]

Same

I can't authenticate the MCP server what the freak

[jericho1050]

I think their mcp service is dead idk

[geekybaiyi]

yeah, that's exactly the same error I got, thanks for the screenshots.

used to work a few days ago. not happy about it!

[nagic0]

same issue, but codex with notion mcp works correctly

[jericho1050]

The work around i did is generate an integration token and gave it to claude code

[pwittchen]

Same error for me. IMO, this plugin and MCP server should be fixed or removed. What's the point of having a tool, which does not work when you follow the official docs and then you have to do workarounds for it?

[EricWiener]

Same error. Codex also worked for me