I asked claude code for a guidelines file so it would collaborate with windsurf. This is what it proposed:

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    This project uses shared planning documents for collaboration with Claude Code. Please:

    1. First read and understand these files:

       - PLAN.md - current project roadmap and objectives

       - ARCHITECTURE.md - technical decisions and system design

       - TODO.md - current tasks and their status

       - DECISIONS.md - decision history with rationale

       - COLLABORATION.md - handoff notes from other tools

    2. Before making any significant changes, check these documents for:

       - Existing architectural decisions

       - Current sprint priorities

       - Tasks already in progress

       - Previous context from Claude Code

    3. After completing work, update the relevant planning documents with:

       - Task completion status

       - New decisions made

       - Any changes to architecture or approach

       - Notes for future collaboration

    Always treat these files as the single source of truth for project state.