Claude Code 2.1.280

Claude Code 2.1.280 makes Claude Opus 5.5 the default Opus model, with a 1M-token context window, pricing of $4/$20 per Mtok, and $0.20/Mtok for cache reads. The release also adds mouse support, a new MCP configuration option, and several fixes to auto mode and file writes.

• Mouse support now covers more lists in fullscreen mode: the mouse wheel scrolls the /skills list, and a skill's state options in /plugin can be clicked.
• A new CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH variable lets users change the 2,048-character cap on MCP tool descriptions and server instructions for every MCP server in the session.
• The hook_execution_complete OpenTelemetry event now includes hook output sizes and the number of oversized outputs saved to a file.
• Fixed writes through a symlinked path being judged by their in-tree spelling, which had let acceptEdits, allow rules, and auto mode approve a write that actually landed outside the intended location.
• Fixed auto mode retrying an action repeatedly when a safety check declined to review it; the action is now denied once instead.
• Fixed auto mode denying actions repeatedly without pause when a safety check gave no answer; retries now back off, and the turn stops with a message after ten in a row.
• Fixed Write calls failing validation when a model sent path, file_text, file_content, or a stray description instead of the expected parameters.

Full details are in the changelog.

Claude Code

Anthropic's agentic coding tool — Claude in your terminal, IDE, desktop app and browser, reading and editing your codebase, running commands, opening pull requests and working on tasks in the cloud.

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