Tools
Claude Code switches Pro and Team Standard default to Opus and makes the 2,048-char MCP description cap configurable
Along with adding claude-opus-5-5 as the default Opus model, v2.1.280 changes the default model on Pro and Team Standard plans from Sonnet to Opus, matching Max, Team Premium and Enterprise. A new env var, CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH, overrides the 2,048-character cap on MCP tool descriptions and server instructions for every server in a session. Two other fixes help people who build on Claude Code: agent-type PermissionRequest hooks now raise an error, because they could never allow or deny, and a finished subagent's report is no longer lost when the parent conversation compacts before reading it.
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