Resolved after 8 hours 40 minutes, affecting Starburst Galaxy UI, on September 9, 2026.
This incident is now resolved. All impacted MCP calls should now be operating as expected.
Affected components
Update timeline
- identified Sep 09, 2026, 12:02 PM UTC
Starburst Galaxy's MCP server is returning an error for every tool call from MCP clients using the newest protocol revision, 2026-07-28. Sign-in, discovery and tool listing are unaffected, and clients on revision 2025-11-25 are not affected. Workaround: pin your MCP client to protocol revision 2025-11-25, which has been confirmed to restore tool calls. We are investigating and will post an update as soon as we have one.
- identified Sep 09, 2026, 02:37 PM UTC
We've identified an issue causing MCP tool calls to fail with a protocol error for Galaxy MCP users (both mcp-starburst and mcp-starburst-public, all auth methods). A fix is in progress. Workaround (Claude Code users): setting "MCP_PROTOCOL_NEGOTIATION": "legacy" in ~/.claude/settings.json mitigates the issue. Other MCP clients (Gemini CLI, Cursor, Continue.dev, Cline) aren't currently affected, since they default to an older protocol revision.
- resolved Sep 09, 2026, 08:42 PM UTC
This incident is now resolved. All impacted MCP calls should now be operating as expected.
Your product runs on more than Starburst Galaxy
Add the vendors you depend on and get one message when any of them reports trouble. Free for 3 vendors, no card.
Amazon Web Services