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The render route selects one provider adapter for Claude, OpenAI, Codex, Cursor, or Pi. Each adapter converts provider events into the common activity and transcript formats used by the interface.

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Tools

Open tab reads and writes use the docwriter-doc MCP server. Agent scratch paths use normal file tools. The system prompt routes open tab changes through edit_doc so the change and review round remain one Yjs transaction. Provider tool inventories differ. Claude uses the Agent SDK tool set and native subagents. Other providers use normalized local tool handlers and store conversation events in SQLite.

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Sessions

Claude can resume a native provider session. Other providers use their own session records or DocWriter conversation events. Switching providers clears the active provider session identifier.

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Skills and reviewers

Skills are loaded from bundled and project directories. Providers without a native skill mechanism receive the relevant skill instructions in their prompt. A critique pass resolves one reviewer and asks the main agent to run one review subagent. Reviewer identity is attached to comments and review rounds.