Claude Code aifirst-review

Claude Code 2.1.219 review: subagent nesting depth default changed to 3

TLDR

2.1.219 changes default subagent nesting depth from 1 to 3 (the third change in three releases), makes Opus 5 the default Opus model, improves MCP error reporting, and removes Opus 4.7 from fast mode.

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Source: aifirst-review · Category: Claude Code · Summary is machine-generated; verify against the original.

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Claude Code 2.1.219 review: subagent nesting depth default changed to 3

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