Pair Programming

Pair Programming

The Pair Programming pattern binds two sessions to a shared workspace (workspaceOverride) where one acts as the Driver (editing files, implementing logic) and the other acts as the Navigator (reviewing code, checking architecture, guiding steps) in a turn-based collaborative loop.

Driver-Navigator Loop

┌────────────────────────────────────────────────────────┐
│                   Shared Workspace                     │
│               (Same Workspace Override)                │
└──────────────────────────┬─────────────────────────────┘
             ┌─────────────┴─────────────┐
             ▼                           ▼
      [ Driver Session ] ◄────────► [ Navigator Session ]
        - Write code and implement   - Review design, guide structure
        - Direct file modifications  - Provide feedback (turn-based)

5-Stage Workflow

1. Session Selection: Inspect existing child sessions and reuse an Idle Driver/Navigator session with the matching assistant ID and exact workspace contract through agent__messageToSession. Use reset=true when beginning a fresh pairing task. Start a new session only when no compatible pair member exists or the required role/workspace differs.
2. Workspace Configuration: Ensure both sessions share the exact same workspaceOverride directory.
3. Assign Roles: Allocate the Driver role to a code-generation model and the Navigator role to an analysis-focused model.
4. Turn-based Interaction:
   • The Driver implements a section of code and writes a summary of the edits for the Navigator.
   • The Navigator runs view_file or git diff on the workspace, checks for issues, and sends feedback/next instructions to the Driver.
5. Role Rotation: Swap roles when moving between tasks (e.g., swapping to write test suites). See role-rotation.md.
6. Validation: Run the final project test pipeline to verify correctness.

🛠️ MCP Tools Guide

• Turn Coordination: The parent session collects the Driver's changes summary and forwards them to the Navigator via agent__messageToSession to invoke the next turn, maintaining a lock-step loop.

References

• Role rotation
• Turn protocol
• Diff review checklist