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What ACP adds:
• Structured envelopes: Every message follows a JSON-like schema.
• Execution Blueprint (DAG): All calls and dependencies are logged in a persistent directed-acyclic graph.
• Standard error codes: 6xx-style codes localise failures and trigger retries or re-routes.
• Plug-n-play: ACP lives at the protocol layer—register a new MCP tool easily and it’s instantly callable inside any agent plan. No retraining required.
Result: Deterministic Traces, Automatic Recovery, Easier Audits, Plug-n-Play.