What is Relay?
Relay is a Mac utility for passing conversations between Claude, Codex, and Cursor without manually copying and pasting between them. Type /relay in one of those apps to send selected chat context to another, where a second AI can respond and the reply can return to the original workflow. Relay is aimed at people who use multiple AI assistants while working on code or other projects, and also supports sending a repository question to ChatGPT in the Codex app.
Relay Features:
Cross-App Relay: Use /relay in Claude, Codex, or Cursor to open a handoff to another app, then send the prepared quote or choose an existing thread.
Incremental Context: Relay proposes the messages since the previous handoff, keeps the speakers identified, and can include an earlier answer when a reply depends on it.
Chained Opinions: Add another app, such as Cursor, to a relay sequence so each conversation passes to the next and later agents can see earlier replies.
File References: Images, generated files, and edited files are passed as paths or links, leaving the files in place rather than copying or uploading them.
Repository Questions: Choose a repository or folder and send a question about it to ChatGPT in the Codex app, excluding ignored files and common sensitive files by name.
Context and Plans: View Claude and Codex context-window usage and plan limits, with 75 relay sends a week on Free and Personal and unlimited sends on Pro.
Relay Benefits:
Less Manual Handoff: Moving a question between assistants takes less clipboard work, leaving more attention for reviewing their answers.
More Useful Feedback: A second assistant can assess a proposed idea or fix from a different perspective while retaining the relevant conversation.
Keep Your Workflow: You can continue using the AI desktop apps you already work in instead of shifting the whole task to a separate orchestration setup.
Human Oversight: You can inspect and edit what will be sent, add a note, or decide not to send it, keeping handoffs under your control.
Fewer Context Gaps: Passing relevant prior replies along helps another assistant understand the discussion without requiring you to explain it again.
Use Cases:
Review a Code Fix: Ask Codex to check a change proposed in Claude, carrying the discussion over so it can look for missed problems.
Compare Approaches: Send a design or implementation question from one coding assistant to another for an independent response.
Share a Mockup: Ask another assistant for feedback on a screenshot already present in the conversation, passed along as a file path.
Continue a Long Thread: Start a fresh conversation through Relay when a thread grows long, carrying forward the context that still matters.
Ask About a Repository: Select a project folder and ask ChatGPT in Codex a question about its contents without adding a conversation thread.