# Starburst: Galaxy MCP server — tool calls failing

> Starburst status incident “Galaxy MCP server — tool calls failing” on 2026-09-09: impact major (vendor’s label), 0 min, 3 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/starburst/incidents/njw44gcf8474
Last updated: 2026-09-09T20:42:33Z

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-09-09 20:42 UTC · Resolved: 2026-09-09 20:42 UTC · Duration: 0 min
- Updates: 3 · Affected components: Starburst Galaxy UI
- [Vendor status page: https://status.galaxy.starburst.io/incidents/njw44gcf8474](https://status.galaxy.starburst.io/incidents/njw44gcf8474)
- [Company: Starburst](https://rewindex.com/company/starburst.md)

## Timeline of updates

- **identified** 2026-09-09 12:02 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** 2026-09-09 14:37 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** 2026-09-09 20:42 UTC: This incident is now resolved. All impacted MCP calls should now be operating as expected.

## Rewindex changes for this incident

- 2026-09-09 20:42 UTC: [Major incident: Galaxy MCP server — tool calls failing](https://rewindex.com/change/i08bc1a3f3bbd2a.md)

## Cite this

Status incident (vendor impact label: major) posted by Starburst, started 2026-09-09 20:42 UTC, resolved after 0 min, 3 update(s).

- Canonical URL: https://rewindex.com/company/starburst/incidents/njw44gcf8474
- Citation: Starburst, “Galaxy MCP server — tool calls failing” (2026-09-09 20:42 UTC). Archived by Rewindex: https://rewindex.com/company/starburst/incidents/njw44gcf8474 (CC BY 4.0).
- Markdown link: `[Starburst: Galaxy MCP server — tool calls failing (2026-09-09)](https://rewindex.com/company/starburst/incidents/njw44gcf8474)`


---
Canonical: https://rewindex.com/company/starburst/incidents/njw44gcf8474 · Markdown: https://rewindex.com/company/starburst/incidents/njw44gcf8474.md · JSON: https://rewindex.com/api/v1/companies/starburst/incidents/njw44gcf8474 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T14:00:59.906Z