Resolved after 6 hours 25 minutes, affecting LangSmith Fleet, on August 5, 2026.
Resolved. Fix is now deployed that skips an unsupported tool schema and logs a warning instead of failing the request.
Affected components
Update timeline
- investigating Aug 05, 2026, 03:27 PM UTC
We're investigating an issue where agents and workflows using Anthropic Claude models with custom tools may fail to complete runs. Affected requests return a tool input validation error. We'll share more information as we have it.
- identified Aug 05, 2026, 06:36 PM UTC
We're seeing elevated error rates when using Fleet with Claude models and certain MCP tools
- monitoring Aug 05, 2026, 08:21 PM UTC
We're seeing elevated error rates when using Fleet with Claude models and certain MCP tools.
- resolved Aug 05, 2026, 09:52 PM UTC
Resolved. Fix is now deployed that skips an unsupported tool schema and logs a warning instead of failing the request.
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