AI BriefingIsoKron Research: MCP Servers and APIs Lose Concurrent Writes in Claude Opus Tests
·2026.11.14 03:49
Key point
IsoKron research found that Kubernetes, GitHub, and Grafana MCP servers, as well as PostHog's API, can lose concurrent writes in Claude Opus sessions, with the Kubernetes server losing changes in 20 of 20 runs.
Details
- The Kubernetes MCP server lost a teammate's concurrent change in 20 of 20 runs, incorrectly reporting that other keys were unchanged.
- The GitHub MCP server lost one change in 19 of 30 concurrent write pairs, while the Grafana MCP server lost changes in 30 of 30 runs due to forced overwrites that skip version checks.
- A modified build that refuses stale writes with a 409 error preserved the teammate's change in 20 of 20 runs.
- The study notes that data loss in PostHog occurred in its own API, with a fix merged the following morning.
- Recommendations include verifying writes by reading back data and avoiding simultaneous edits to the same object.
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