ANTHROPIC PUB_DATE: 2026.03.29

CLAUDE CODE 2.1.86–2.1.87 SHIPS A SESSION HEADER FOR PROXIES AND KEY STABILITY FIXES; COMMUNITY SKILLS ADD SAAS MULTI‑TENANCY

Claude Code added a session-aware HTTP header and fixed several reliability issues that affected long sessions, tools, and cowork dispatch. The latest releases...

Claude Code added a session-aware HTTP header and fixed several reliability issues that affected long sessions, tools, and cowork dispatch.

The latest releases add an X-Claude-Code-Session-Id header so proxies can group and meter traffic per session, plus a stack of fixes for long transcripts, resume failures, MCP tools in bare mode, and VCS directory exclusions releases. A follow-up patch fixes cowork dispatch messages not being delivered in some cases.

A popular community skills pack introduced a multi-tenant SaaS architecture guide and a phase‑gated debugging workflow, alongside quality-of-life updates for discovery and 3D stacks v9.1.0 skills release. If you need a lightweight way to track Claude Code deltas, there’s also a community changelog repo you can watch changelog.

[ WHY_IT_MATTERS ]
01.

Session-level header makes observability, throttling, and attribution easier without parsing bodies in gateways or proxies.

02.

Stability and memory fixes reduce failures in real-world, long-running coding sessions and unblock MCP tool usage in bare mode.

[ WHAT_TO_TEST ]
  • terminal

    Update your proxy/gateway to log and bucket by X-Claude-Code-Session-Id; verify rate limits, quotas, and dashboards aggregate correctly by session.

  • terminal

    Stress a long session with large transcripts and /feedback to confirm OOM and resume issues are gone, and validate MCP tools appear in --bare interactive sessions.

[ BROWNFIELD_PERSPECTIVE ]

Legacy codebase integration strategies...

  • 01.

    Teach existing API gateways and SIEMs to trust, log, and alert on X-Claude-Code-Session-Id; backfill dashboards to pivot by session.

  • 02.

    Re-test legacy sessions created pre-2.1.85 for --resume behavior and confirm Grep/file autocomplete ignore .jj and .sl directories.

[ GREENFIELD_PERSPECTIVE ]

Fresh architecture paradigms...

  • 01.

    Design session-scoped quotas, cost accounting, and SLOs from day one using the new header.

  • 02.

    Use the community saas-multi-tenant skill as a starting blueprint for tenant isolation and admin pathways.

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