Meta, Sierra Set Personal Agent Protocol

This is less a finished product than a credible attempt to make agentic commerce legible to enterprise systems—but its success depends on adoption, permission granularity, and interoperability.

• –OAuth-based guest, read-only, and write access gives users clearer control while letting businesses define agent boundaries.
• –Website, API, MCP, OpenAPI, and company-agent routes could reduce brittle browser automation and one-off integrations.
• –The draft’s planned permissions, notifications, and payment extensions show that important production details remain unresolved.
• –A reference implementation and broader partner participation will determine whether this becomes a real developer standard or another competing agent protocol.