Composer (Cursor)
Cursor's multi-file mode: Composer 2 (2025) coordinates changes across several files at once, with planning and agentic execution. Distinct from Cursor chat (single-file) and Tab autocomplete.
Strengths
- Cross-file refactoring done right (vs Tab which only sees one line)
- Proposed changes visualization before applying, built-in peer-review
- Model switching (Claude, GPT, Cursor model) per task
Limitations
- Limited to session context, no persistence like CLAUDE.md
- Coupled to Cursor IDE, leaving = losing session history
- Cursor Pro cost needed for intensive use (~$20/month)
Best for
- Cross-file refactors (rename, extract, reorganize components)
- Feature additions touching multiple files in parallel