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-isrgit 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-isr)<a href="https://agentmods.dev/skills/ksachdeva/zephyr-rtos-ai/zephyr-isr"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-isr/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-isr"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-isr.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 | $0.00071 | $0.01141 |
| Opus 5 | $0.00036 | $0.00571 |
| Sonnet 5 | $0.00014 | $0.00228 |
| Haiku 4.5 | $0.00007 | $0.00114 |
Grade A, and why
zephyr-isr 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 12d 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 — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Zephyr ISR (Interrupt Service Routines)
Overview
This skill provides expert knowledge on interrupt handling in Zephyr RTOS. It covers ISR registration (static and dynamic), direct ISRs for low-latency handling, IRQ management, interrupt context constraints, and patterns for offloading work from ISRs to threads.
Key Constraints (Memorize)
ISR Context Rules:
- ISRs run on a dedicated interrupt stack
- ISRs can be nested (higher priority preempts lower)
- ISRs must never block - no
K_FOREVERorK_MSEC(n)timeouts - Use
k_is_in_isr()to detect interrupt context - Many kernel APIs are thread-only; check docs before use in ISR
ISR-Safe Operations:
k_sem_give()- always safek_sem_take(&sem, K_NO_WAIT)- safe (non-blocking)k_msgq_put()/k_fifo_put()withK_NO_WAIT- safek_work_submit()- safe (offload to system workqueue)
Workflow
1. Choose ISR Type
| Type | Use When | Registration |
|---|---|---|
| Regular | Most cases, arguments known at build time | IRQ_CONNECT() |
| Dynamic | Arguments known only at runtime | irq_connect_dynamic() |
| Direct | Ultra-low latency required | IRQ_DIRECT_CONNECT() |
Step 1: Read references/isr-types.md for detailed implementation of each type.
2. Implement ISR
Once the ISR type is chosen, implement the handler:
/* Regular ISR */
void my_isr(const void *arg)
{
/* Fast processing only - never block */
}
/* Direct ISR (for lowest latency) */
ISR_DIRECT_DECLARE(my_direct_isr)
{
do_minimal_work();
ISR_DIRECT_PM(); /* Power management hook */
return 1; /* 1 = check reschedule, 0 = skip */
}
3. Register and Enable
/* Build-time registration */
IRQ_CONNECT(IRQ_NUM, PRIORITY, my_isr, my_arg, FLAGS);
irq_enable(IRQ_NUM);
/* Runtime registration */
irq_connect_dynamic(IRQ_NUM, PRIORITY, my_isr, my_arg, FLAGS);
irq_enable(IRQ_NUM);
4. Offload Time-Consuming Work
What ships with it
4 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.
- 12d ago First seen · 136 lines · 71 tokens per session scan A 0d988b13848b
zephyr-isr is a skill published in the GitHub repository ksachdeva/zephyr-rtos-ai (23 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 71 tokens to every session and 1,141 once invoked, about $0.0004 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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