Claude Code 2.1.142: new claude agents flags + fast mode defaults to Opus 4.7

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)

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)

Sources

• Claude Code changelog: https://code.claude.com/docs/en/changelog