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 ksachdeva/zephyr-rtos-ai --skill zephyr-storagegit clone --depth 1 https://github.com/ksachdeva/zephyr-rtos-aiWrote 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/ksachdeva/zephyr-rtos-ai/zephyr-storage)<a href="https://agentmods.dev/skills/ksachdeva/zephyr-rtos-ai/zephyr-storage"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-storage/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/ksachdeva/zephyr-rtos-ai/zephyr-storage"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-storage.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 | $0.00098 | $0.00939 |
| Opus 5 | $0.00049 | $0.00469 |
| Sonnet 5 | $0.00020 | $0.00188 |
| Haiku 4.5 | $0.00010 | $0.00094 |
Grade A, and why
zephyr-storage 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 — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Zephyr Storage Skill
Quick Decision: NVS vs ZMS
What hardware are you targeting?
├── Classical NOR flash (most MCUs) → Use NVS
├── RRAM/MRAM (no erase required) → Use ZMS
├── Need >64K unique IDs → Use ZMS (supports 32/64-bit IDs)
└── Unsure → Use NVS (battle-tested default)
| Feature | NVS | ZMS |
|---|---|---|
| ID size | 16-bit (65K max) | 32-bit or 64-bit |
| Best for | Classical flash | RRAM, MRAM, large flash |
| Erase optimization | Standard | Single-write erase (256x faster on RRAM) |
| ATE size | 8 bytes | 16 bytes |
| Data CRC | Optional | Built-in (in ATE) |
| Small data optimization | No | Yes (data stored in ATE if <=8 bytes) |
| Status | Stable, widely used | Newer, recommended for new designs |
When to Use This Skill vs zephyr-settings
| Use Case | Skill |
|---|---|
| Store data with numeric IDs | zephyr-storage (this skill) |
Store data with string keys (e.g., wifi/ssid) |
zephyr-settings |
| Direct flash control needed | zephyr-storage |
| Integration with Bluetooth/Shell settings | zephyr-settings |
| Maximum performance, minimal overhead | zephyr-storage |
Basic Usage Pattern
Both NVS and ZMS follow the same pattern:
#include <zephyr/fs/nvs.h> // or <zephyr/fs/zms.h>
// 1. Define storage structure
static struct nvs_fs fs; // or struct zms_fs
// 2. Configure and mount
fs.flash_device = FIXED_PARTITION_DEVICE(storage_partition);
fs.offset = FIXED_PARTITION_OFFSET(storage_partition);
fs.sector_size = /* flash page size */;
fs.sector_count = 3; // minimum 2
nvs_mount(&fs); // or zms_mount()
// 3. Read/Write/Delete
nvs_write(&fs, ID, data, len);
nvs_read(&fs, ID, buffer, len);
nvs_delete(&fs, ID);
Kconfig Quick Reference
NVS
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
# Optional performance
CONFIG_NVS_LOOKUP_CACHE=y
CONFIG_NVS_LOOKUP_CACHE_SIZE=128
# Optional integrity
CONFIG_NVS_DATA_CRC=y
ZMS
CONFIG_FLASH=y
CONFIG_FLASH_MAP=y
CONFIG_ZMS=y
# Optional: 64-bit IDs (default is 32-bit)
CONFIG_ZMS_ID_64BIT=y
# Optional performance
CONFIG_ZMS_LOOKUP_CACHE=y
CONFIG_ZMS_LOOKUP_CACHE_SIZE=128
What ships with it
5 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 · 105 lines · 98 tokens per session scan A 4e9797516733
zephyr-storage is a skill published in the GitHub repository ksachdeva/zephyr-rtos-ai (23 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 98 tokens to every session and 939 once invoked, about $0.0005 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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