Safety Principles draft

Part I: Foundations

October 18, 2026 Draft for public comment, version 0.1

Part I sets whom the Safety Principles bind, how their duties rank, what their words mean and how binding their rules are.

A draft for public comment, not yet in force. Please read the status notice before relying on any part of it.

Article 1. Purpose and scope

The Safety Principles bind Dunster's own robots and any robot whose maker or operator adopts them, from first prototype to retirement.

1.1 Purpose. The Safety Principles exist to prevent injury and death caused by physical AI, and to make each robot's safety provable with evidence.

1.2 Systems covered. They cover robots and other physical AI systems that move or act among people, including prototypes and demonstration units. They also cover each robot's software, AI models, cloud services and recorded data.

1.3 People bound. They bind everyone who builds, deploys, operates, services or modifies a covered robot.

1.4 Lifecycle. They apply through design, testing, demonstration, installation, operation, maintenance, software updates, recall and retirement.

1.5 Safety is never an extra. Safety functions are standard on every unit and are never sold separately, and no paid feature may loosen a limit. The maker keeps its duties for the life of each unit.

1.6 Settings. The rules apply wherever robots work near people. Annex A shows how they apply in pharmacies, the first setting this draft covers in detail.

1.7 Prototypes are not exempt. A prototype used outside its maker's lab follows every rule a product follows. Inside the lab, a written test plan may suspend a named rule only with Safety Commission approval and a trained safety observer present.

1.8 Law comes first. The Safety Principles add to the law and to each site's own safety rules and never replace them. Where the law or a site rule is stricter, it applies.

1.9 Every step on record. Where a robot shares a workflow with people, each step is checked and recorded, for robot and human work alike.

Article 2. Order of priorities

When duties conflict, the lower number wins, and nothing a person, a customer or the AI wants can reorder them.

2.1 The six duties.

  1. Never injure a person, by contact or through the result of the robot's work.
  2. Reach the safe state when anyone signals stop.
  3. Keep harm from spreading to other people, property or materials.
  4. Follow instructions from authorized people.
  5. Do the task well.
  6. Protect the robot itself.

2.2 Reading the order. A lower-numbered duty always wins. No instruction, productivity target, commercial term or AI objective can reorder the duties.

2.3 Harm through results. A robot can injure a person through the result of its work as surely as through contact, for example by passing on a wrong drug, dose or label. Duty 1 therefore covers the accuracy of safety-critical work, and an unresolved error stops that work, not just the motion.

2.4 When in doubt, stop and ask. If the robot cannot tell whether an action could injure someone, it treats the action as if it could. It pauses, says what it is unsure of and waits for a person.

2.5 No reward for unsafe outcomes. No objective, reward or metric used to train, tune or rate the robot's AI shall reward an outcome that breaches duties 1 to 3. Speed and throughput count only among safe outcomes.

2.6 Duty to warn. When the robot detects a hazard it did not cause, such as a spill, a fallen item or a person in distress, it warns people nearby and reports it. A robot acts physically to protect a person only under Article 12.

2.7 Unresolved conflicts. If two instructions or duties conflict and this order does not settle it, the robot goes to its safe state and asks the supervisor.

Anchored to: research on written robot constitutions (Generating Robot Constitutions and Benchmarks for Semantic Safety).

Article 3. Definitions and classes

These terms carry the same meaning in every article, guardrail record and agreement that cites the Safety Principles.

3.1 Terms.

TermMeaning
Safe stateThe condition a robot reaches when it stops: no motion toward a person, the load secured, nobody trapped, energy under control. Each motion names its own safe state.
Safety layerSafety-rated hardware and software that enforce the limits independently of the AI.
GuardrailA limit with its sensor, response and test, recorded as one guardrail record.
Operating envelopeWhere, when and how a robot may operate, adapted from the operational design domain of SAE J3016.
Reach zoneThe space the robot's arm, gripper and any held object can reach from where it stands, plus a margin set in its envelope.
Explicit yesA deliberate confirmation from an enrolled person, by voice, button or gesture, after the robot has announced the action. Silence, hesitation or an unclear answer is not a yes.
Intended contactContact that is part of the task, such as handing over an item. It always needs an explicit yes.
Incidental contactBrief contact that is not part of the task, such as brushing an arm.
CollisionUnplanned contact beyond a brush: an impact, where the body part can recoil, or a clamp, where it cannot (ISO 10218-2:2025).
IncidentAn injury; contact above a limit; a broken container of a hazardous substance or glass; a discrepancy in controlled items; or an error in safety-critical work found after its check was passed.
Near missAn event that could have become an incident but did not.
Vulnerable personSomeone less able to notice, avoid or withstand contact, such as patients, older adults, children and people with impaired movement or perception.

3.2 People.

RoleWhoExample
Any personAnyone near the robotA delivery driver passing through
OperatorSomeone trained, checked and enrolled to work with the robotA pharmacy technician
SupervisorThe person responsible for the siteThe pharmacist on duty
Service technicianA maintainer certified by the robot's makerA field engineer
Safety CommissionThe maker's safety body, with outside advisorsApproves exceptions and changes

Dunster is forming its Safety Commission, with advisors from industry, law and regulators. Until it is in place, its duties under this draft rest with Dunster's founders.

3.3 Robot classes.

ClassPeople within reachContactExample
SeparatedNo; guarding keeps people outNoneA robot behind a barrier
SharedYesNot part of the task, except handovers after a yesA robot working beside staff
ContactYesPart of the taskA robot built to touch people, such as for care

3.4 Autonomy levels.

LevelWhat runsWho must be presentStatus
A0 ManualA person controls every motionThe person controlling itService and setup
A1 AssistedThe robot runs one step per commandAn operator giving each commandTraining and setup
A2 AttendedThe robot runs tasksAn operator in the room at all timesThe starting level for robots working within reach of people
A3 UnattendedThe robot runs tasks alone inside a set envelope and reaches its safe state itselfNo one, inside the envelopeNeeds Safety Commission approval
A4 Site-wideThe robot runs across a site without attendanceNo oneNot permitted in this version

Article 4. Force of the rules

Every clause binds at the strength its wording states, and only the Safety Commission can grant an exception.

4.1 Wording. "Shall", and rules stated as facts ("the robot stops"), are mandatory. "Should" is expected unless a documented reason says otherwise. "May" is permitted.

4.2 Order of authority. Law comes first, then any stricter rule of the site, then these Safety Principles, the setting or product profile, and the guardrail records, in that order. A profile or record can tighten an article but never loosen it.

4.3 Safer reading wins. Where a clause is unclear, the reading that better protects people applies until the Safety Commission clarifies it.

4.4 Conformance. A unit conforms when every "shall" that applies to it is met and evidenced. Only conforming units, or units with an approved exception, may be used outside the maker's lab. Each unit records the version of the Safety Principles it was certified to.

4.5 Exceptions. Only the Safety Commission may approve an exception: in writing, for a named unit and rule, for a fixed period. Each exception has a compensating measure and an owner, and lapses on its end date.

4.6 Beyond exception. No exception may weaken the order of priorities (Article 2), anyone's ability to stop a robot (Article 10.2), the body-region ceilings (Article 13.3) or the independence of the safety layer (Article 17.1).

4.7 Changes. The Safety Principles change only through Article 33. A change that loosens any limit needs new evidence and Safety Commission approval.

4.8 Reference text. The version published on dunster.ai is the reference text.

Comments

Comments are open for 60 days from publication. Comments posted here are public once Dunster Physical AI has reviewed them. Comments and emails are not treated as confidential, and Dunster may use them to improve the Safety Principles. Please don’t send patient information or anyone’s confidential material. To raise a safety or security concern privately, email info@dunster.ai.