Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add beriberikix/zephyr-agent-skills --skill security-updatesgit clone --depth 1 https://github.com/beriberikix/zephyr-agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/beriberikix/zephyr-agent-skills/security-updates)<a href="https://agentmods.dev/skills/beriberikix/zephyr-agent-skills/security-updates"><img src="https://agentmods.dev/badge/skills/beriberikix/zephyr-agent-skills/security-updates/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/beriberikix/zephyr-agent-skills/security-updates"><img src="https://agentmods.dev/badge/skills/beriberikix/zephyr-agent-skills/security-updates.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00067 | $0.00825 |
| Opus 5 | $0.00034 | $0.00413 |
| Sonnet 5 | $0.00013 | $0.00165 |
| Haiku 4.5 | $0.00007 | $0.00082 |
Grade A, and why
security-updates scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Zephyr Security & Updates
Build production-ready, secure embedded systems using Zephyr's modular security stack and MCUboot bootloader.
Core Workflows
1. MCUboot Integration
Set up the secure bootloader and define fail-safe flash partitions.
- Reference: mcuboot_integration.md
- Key Tools:
CONFIG_BOOTLOADER_MCUBOOT,fixed-partitions, Devicetree.
2. Image Signing
Ensure firmware integrity with production-grade digital signatures.
- Reference: image_signing.md
- Key Tools:
imgtool.py, ECDSA-P256, RSA.
3. DFU Protocols
Transport updates securely using MCUmgr or cloud-based OTA.
- Reference: dfu_protocols.md
- Key Tools:
mcumgr, Golioth OTA, SMP transport.
4. Rollback Protection
Implement atomic swaps and image confirmation to prevent bricking devices.
- Reference: rollback_protection.md
- Key Tools:
boot_write_img_confirmed(),mcumgr image test.
5. Crypto Basics
Implement secure storage and cryptographic operations using mbedTLS.
- Reference: crypto_basics.md
- Key Tools:
CONFIG_MBEDTLS, TF-M, secure storage.
Quick Start (Kconfig for Secure Boot)
# Enable MCUboot support in application
CONFIG_BOOTLOADER_MCUBOOT=y
# Build with MCUboot using Sysbuild
west build -b nucleo_f401re --sysbuild samples/basic/blinky
Professional Patterns (Security-First)
- Production Keys: Never use default MCUboot keys. Provision unique keys during manufacturing.
- Heartbeat Confirmation: Only confirm a new image after the application has successfully connected to its cloud backend.
- Version Integrity: Enable version monotonicity to prevent accidental or malicious firmware downgrades.
Automation Tools
- mcuboot_version_guard.py: Enforce monotonic semantic version progression in update pipelines.
What ships with it
8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 76 lines · 67 tokens per session scan A 352b9fdf73f4
security-updates is a skill published in the GitHub repository beriberikix/zephyr-agent-skills (63 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 67 tokens to every session and 825 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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