Claude Code v2.1.274: self-healing transcripts and a batch of MCP fixes
ashwin-ant · ghdev · 2026-09-17
anthropics/claude-code shipped v2.1.274 with notable fixes and features:
- Stability: corrupted transcripts that caused endless "unexpected tooluseid" 400 retries now self-heal, or fail fast with a clear error and a /rewind hint
- MCP fixes: legacy HTTP+SSE servers failing on 4xx responses, Streamable HTTP tool calls hard-timing out at 5 minutes, prompts/resources not refreshing without a listChanged declaration, and 403 insufficientscope errors misreported as expired sign-in (now names missing permissions)
- New config: CLAUDECODEMCPSTARTUPWAITMS to bound first-turn MCP wait; configurable Postgres connect timeout (default 5s) in the Claude apps gateway
- Observability: effort attribute on OTel spans plus a managed-settings resolution event
- UX: visible critical-memory warning with recovery steps, and click-to-expand for collapsed teammate/agent messages
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