Claude Code 2.1.203

• [changed] The Artifact tool now accepts action: "list" to enumerate previously published artifacts and accepts an existing url to update an artifact in place rather than always creating a new one.
• [changed] ArtifactInput schema updated to make file_path and favicon optional (required only for publish) and to add action and limit parameters.

Models & prompts

• Refined context-management and user-intent rules around repeated instructions after blocks, boundaries that stay in force until explicitly lifted, and handling of agent-inferred parameters.
• Updated guidance on production-precedence rules, sensitive-data provenance, and when user consent is considered informed for high-severity actions.
• Clarified distinctions between the Claude Agent SDK, the Messages API Tool Runner, and Managed Agents in tool-use documentation.
• Adjusted focus-mode and onboarding prompt fragments.

Under the hood

• Added support for several new internal settings and feature flags related to fleet session history, workflow-size warnings, auto-mode edit classification, and terminal relaunch sizing.
• New backend route /api/frame/frames added.
• Removed several deprecated feature gates and environment variables (CLAUDE_BRIDGE_USE_CCR_V2, CLAUDE_CODE_SHOJI_ENGINE, CLAUDE_CODE_USE_CCR_V2, and the summarize-connector-text-2026-03-13 beta header).

Upgrade notes

No manual steps required.