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-shell-commandsgit 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-shell-commands)<a href="https://agentmods.dev/skills/ksachdeva/zephyr-rtos-ai/zephyr-shell-commands"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-shell-commands/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-shell-commands"><img src="https://agentmods.dev/badge/skills/ksachdeva/zephyr-rtos-ai/zephyr-shell-commands.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 | $0.00145 | $0.01636 |
| Opus 5 | $0.00072 | $0.00818 |
| Sonnet 5 | $0.00029 | $0.00327 |
| Haiku 4.5 | $0.00015 | $0.00164 |
Grade A, and why
zephyr-shell-commands 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 9d 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 — 194 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Zephyr Shell Commands
Expert guidance on Zephyr's Shell subsystem for creating custom CLI commands, managing subcommands, and interacting with users via console interfaces.
Table of Contents
Core Concepts
Command Registration vs. Handler Implementation
| Step | What | Where |
|---|---|---|
| Define Handler | Implement shell_cmd_handler function |
Your C file |
| Register Command | Use SHELL_CMD_REGISTER or SHELL_CMD_ARG_REGISTER |
Your C file (global scope) |
| Enable Shell | Set CONFIG_SHELL=y |
prj.conf |
Handler Prototype
typedef int (*shell_cmd_handler)(const struct shell *sh, size_t argc, char **argv);
sh: Shell instance pointer (use for all output)argc: Argument count (includes command name)argv: Argument vector.argv[0]is the command name- Return:
0success,-EINVALinvalid args,-ENOEXECexecution failed
Key Rules
- Use shell output functions: Always use
shell_print(),shell_error(), etc. Never useprintk()in handlers - Return codes matter: Return
0on success, negative errno on failure - Argument counting:
mandatorycount includes the command name itself
Common Workflows
1. Creating a Simple Root Command
static int cmd_hello(const struct shell *sh, size_t argc, char **argv)
{
ARG_UNUSED(argc);
ARG_UNUSED(argv);
shell_print(sh, "Hello, World!");
return 0;
}
SHELL_CMD_REGISTER(hello, NULL, "Print hello message", cmd_hello);
2. Creating Commands with Subcommands
- Macro syntax and registration: See macros.md
- Complete examples: See examples.md
Quick Example:
static int cmd_demo_ping(const struct shell *sh, size_t argc, char **argv)
{
shell_print(sh, "pong");
return 0;
}
SHELL_STATIC_SUBCMD_SET_CREATE(sub_demo,
SHELL_CMD(ping, NULL, "Ping command", cmd_demo_ping),
SHELL_SUBCMD_SET_END
);
SHELL_CMD_REGISTER(demo, &sub_demo, "Demo commands", NULL);
What ships with it
7 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.
- 9d ago First seen · 194 lines · 145 tokens per session scan A 3c95dcb59b5b
zephyr-shell-commands is a skill published in the GitHub repository ksachdeva/zephyr-rtos-ai (23 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 145 tokens to every session and 1,636 once invoked, about $0.0007 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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