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-uartgit 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-uart)<a href="https://agentmods.dev/skills/ksachdeva/zephyr-rtos-ai/zephyr-uart"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-uart/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-uart"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-uart.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 | $0.00144 | $0.02250 |
| Opus 5.5 | $0.00058 | $0.00900 |
| Sonnet 5.5 | $0.00029 | $0.00450 |
| Haiku 4.5 | $0.00014 | $0.00225 |
Grade A, and why
zephyr-uart 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 1mo 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 — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Zephyr UART
Expert guidance for Zephyr's UART driver subsystem covering three API modes: polling, interrupt-driven, and asynchronous (DMA).
Table of Contents
- API Selection
- Getting Device Reference
- Common Workflows
- Configuration
- Error Handling
- Troubleshooting
API Selection
Zephyr provides three UART access methods. Choose based on requirements:
| API | Kconfig | Use Case | Blocking? |
|---|---|---|---|
| Polling | (default) | Simple, low-throughput, debug output | Yes (TX), No (RX) |
| Interrupt-driven | CONFIG_UART_INTERRUPT_DRIVEN |
Background RX, medium throughput | No |
| Async (DMA) | CONFIG_UART_ASYNC_API |
High throughput, zero-copy, low CPU | No |
Decision Tree
Need simple debug output? → Polling
Need background receive? → Interrupt-driven
Need high throughput + low CPU? → Async (DMA)
Need both RX and TX without blocking? → Interrupt-driven or Async
API Mutual Exclusivity
WARNING: Interrupt-driven and Async APIs must NOT be used simultaneously on the same peripheral. Both require hardware interrupts. CONFIG_UART_EXCLUSIVE_API_CALLBACKS=y (default) ensures only one callback type is active.
Getting Device Reference
From Devicetree (Preferred)
#include <zephyr/device.h>
#include <zephyr/drivers/uart.h>
/* Using chosen node (common for console) */
#define UART_NODE DT_CHOSEN(zephyr_shell_uart)
static const struct device *const uart_dev = DEVICE_DT_GET(UART_NODE);
/* Using specific node label */
#define UART_NODE DT_NODELABEL(uart0)
static const struct device *const uart_dev = DEVICE_DT_GET(UART_NODE);
/* Runtime check (in main or init) */
if (!device_is_ready(uart_dev)) {
printk("UART device not ready\n");
return -ENODEV;
}
Common Workflows
1. Polling API (Simplest)
Best for debug output or simple blocking TX.
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.
- 1mo ago First seen · 291 lines · 144 tokens per session scan A 8382778ebfaf
zephyr-uart is a skill published in the GitHub repository ksachdeva/zephyr-rtos-ai (23 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 144 tokens to every session and 2,250 once invoked, about $0.0006 per session on Opus 5.5. 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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