Messaging infrastructureiMessage backends

Messages private-API helper

Extend mac-relay with an injected Swift helper for private IMCore send-side capabilities.

Messages private-API helper — contract and behavior

  • A Swift dylib injected into Messages.app exposes a loopback NDJSON server to the Python backend.
  • It can unlock effects, typing, formatting, reactions, and other operations unavailable through AppleScript.
  • Injection requires a dedicated Mac and weakened SIP posture; it must never be deployed casually on an operator's daily machine.
  • Selector lookup and diagnostics treat OS signature drift as a structured failure because an incorrect private-call cast can crash Messages.app.

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