Claude Code 2.1.142: new claude agents flags + fast mode defaults to Opus 4.7
Claude Code 2.1.142 adds new claude agents flags for background sessions, switches fast mode to Opus 4.7 by default, and ships a large set of reliability fixes across plugins, MCP, daemon behavior, and OS-specific edge cases.
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Anthropic’s Claude Code 2.1.142 release adds new configuration flags for dispatched background sessions (via claude agents) and changes fast mode to default to Opus 4.7 (previously Opus 4.6). (https://code.claude.com/docs/en/changelog)
Anthropic's terminal-based AI coding agent with Claude Opus 4.7, /ultrareview, Routines, /ultraplan, and 80.9% SWE-bench
New claude agents flags
The changelog lists new claude agents flags intended to configure dispatched background sessions:
--add-dir--settings--mcp-config--plugin-dir--permission-mode--model--effort--dangerously-skip-permissions
(https://code.claude.com/docs/en/changelog)
Fast mode now defaults to Opus 4.7
Anthropic says fast mode now uses Opus 4.7 by default, and documents an override to pin fast mode to Opus 4.6:
CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE=1
(https://code.claude.com/docs/en/changelog)
Reliability and workflow fixes (highlights)
Claude Code 2.1.142 also includes a long list of reliability fixes across:
- background sessions and daemon reconnect behavior (including handling macOS sleep/wake clock jumps),
- MCP tool timeout configuration,
- plugin discovery and plugin-cache behavior, and
- Windows-specific issues (including Ctrl+C and network-drive working directories).
(https://code.claude.com/docs/en/changelog)
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