Functional Safety & Fail-Safe Design
Hazard analysis, safety functions and degraded modes for robots and drones, with the ISO 12100/13849 documentation trail.
$49
Works with the AI Agents you already use
Claude Code
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Codex CLI
Muse
Dots+22 moreClaude CodeCursorCodex CLIMuseDots
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Grok
Grok Bot+18 agentsFunctional Safety & Fail-Safe Design
Example session with this skill installed
I'm building a 4-wheeled autonomous delivery bot for sidewalks. I need a hazard analysis and safety functions for losing the main LIDAR sensor and the wireless control link.
- Read your context and instructions
- Compiled the functional safety
I have performed a hazard analysis for the delivery robot's navigation and connectivity subsystems. The following table defines the risks and the engineered safety functions required to mitigate them according to ISO 12100 and ISO 13849 principles.
Hazard Log & Safety Functions
| Hazard | Lifecycle Phase | Severity | Trigger | Safety Function / Reaction | Safe State |
|---|---|---|---|---|---|
| LIDAR Failure | Operation | High (Collision) | Data freeze or < 5Hz update | Immediate deceleration (SS1) | Controlled stop, brakes engaged, hazard lights on. |
| Heartbeat Loss | Operation | Med (Unpredictable) | > 300ms packet loss | Watchdog timeout → Torque off | Motor power cut, passive braking. |
| Geofence Breach | Operation | High (Traffic) | GPS/Odometry coords out of bounds | Vector reversal then stop | Zero velocity within permitted zone. |
| E-Stop Pressed | Maintenance/Op | High | Manual button latch | Hardwired relay trip | Total power isolation from drive motors. |
Degraded Mode Logic
state-diagram
[*] --> Nominal
Nominal --> Degraded_Lidar : Lidar Error
Degraded_Lidar --> Safe_Stop : Velocity > 0.5m/s
Nominal --> Emergency_Stop : Heartbeat_Loss
Emergency_Stop --> [*] : Manual Reset
Next steps
- Define the hardware implementation for the Heartbeat Watchdog to ensure it is independent of the main MCU.
- Calculate the required Performance Level (PL) for the LIDAR safety function based on sidewalk pedestrian density.
- Draft a fault injection test plan to simulate LIDAR data freezing during a 1.0m/s transit.
Connects securely to your tools. The creator never sees your data.
About this skill
Hazards, safety functions, PL/SIL and failsafes that actually trigger.
Engineer fail-safe behaviour for robots, drones and autonomous machines - hazard analysis, safety functions (emergency stop, geofence, return-to-home, safe speed, watchdogs, heartbeat loss), redundancy and degraded modes, and the documentation trail expected by ISO 12100 / ISO 13849 / IEC 61508 / ISO 13482 and DO-178C-style software assurance (light). Use when the user designs safety logic, failsafes, emergency stops, redundancy, or prepares a safety case for an autonomous product.
Includes an EXPERT.md reference (exact parameters, thresholds, failure diagnosis).
This skill helps engineer and document safety behaviour. It does not certify a machine and does not replace a notified body, an assessor or the applicable conformity assessment.
Acceptable use: civil and commercial applications only. Any military, paramilitary or weapon-related use is prohibited, as stated in the skill itself.
How to use
Skills on Agensi run inside your AI agent. Copy the prompt, paste it into your agent, and it connects to Agensi and installs this skill for you. If a payment is needed, your agent shows it to you first.
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