Autonomy levels · Stamped architecture

Level	Name	What the system does	Who acts	Example
AL0	Inform	Shows state and evidence	People decide unprompted	Compressor specific power trend on a screen
AL1	Recommend	Sends a ranked card with options	A person decides and acts	"Fill head 7 is running 2 g heavy, trim it down"
AL2	Confirm to act	Prepares a specific write; a person confirms within a short token window	System writes after confirmation	Two-minute confirmed write of a header pressure setpoint
AL3	Standing policy	Acts inside a signed envelope for a shift; reports each action	System; person can stop	Standing procedure per shift for per-head trims within ±1 step
AL4	Supervised autonomy	Acts across a wider envelope; person monitors by exception	System	Not in scope in the next 12 months
AL5	Autonomous	Pursues plant objectives within safety systems	System	Not in scope

This lines up with Yokogawa's IA2IA Level 0 to 5 and NAMUR WG 4.20's levels (E27). The staged authority in the fast-loop docs (stage 1 messages, stage 2 confirmed write with a 2-minute token, stage 3 standing procedure per shift) is AL1, AL2 and AL3.

The policy framing:

Stamped's authority at a plant is whatever the plant grants in an AutonomyPolicy, per action class and asset, earned through outcomes recorded in the value ledger, and revocable at any time.
Safety instrumented systems (IEC 61511, E25) and the existing control system's interlocks stay outside Stamped's envelope by design; Stamped writes, when granted, only to set points the basic control system already accepts from operators.