embedded-implementation

A guided process for implementing embedded-system code from an existing plan, with checks for hardware details and MISRA C rules, a safety-focused C coding standard.

In plain words
What is it for?
Use it to implement embedded drivers task by task, verify DMA and GPIO details, check initialization, and review the resulting C code.
Why use it?
It adds reviews after each task to catch hardware-integration mistakes and code-quality problems during driver development.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/lhbsaa/embedded-dev-skill/embedded-implementation
Any agent
npx skills add lhbsaa/embedded-dev-skill --skill embedded-implementation
Clone the repo
git clone --depth 1 https://github.com/lhbsaa/embedded-dev-skill

Made for: Claude Code, Codex.

Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 921 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00028 $0.00921
Opus 5 $0.00014 $0.00461
Sonnet 5 $0.00006 $0.00184
Haiku 4.5 $0.00003 $0.00092

Measured 2d ago against content hash 32e3a0ba8889, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

embedded-implementation 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 2d 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.

skills/embedded-implementation/SKILL.md · 163 lines

How it starts

The opening of the file, as written. The whole thing — 163 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Embedded Implementation

Overview

Execute implementation plan with two-stage review after each task.

Core principle: Fresh subagent per task + hardware validation + code quality review = high quality.

Context: Run after embedded-driver-design creates plan.

Two-Stage Review Process

Task Execution → Hardware Validator → Code Quality Reviewer → Commit
     ↓                ↓                     ↓
  Generate code    DMA/GPIO check        MISRA C check

Stage 1: Hardware Validator

  • Use prompts/hardware-validator.md
  • Checks: DMA <= 4092, interface config, init sequence

Stage 2: Code Quality Reviewer

  • Use prompts/code-quality.md
  • Checks: MISRA C, DRY, YAGNI, clean code

Process

1. Load Plan

read docs/embedded/plans/YYYY-MM-DD-<driver>-plan.md

Extract ALL tasks with full text and context.

2. Create Todo List

todowrite todos=[{task: "Task 1: Header file", status: "pending"}, ...]

3. Execute Per Task

For each task:

#### Task N Execution

1. Mark todo: in_progress

2. Get task text and context (already extracted)

3. Dispatch implementation (use prompts/driver-generator.md)
   - Generate code
   - Build verification

4. Stage 1 Review: Hardware Validator
   - Use prompts/hardware-validator.md
   - Check DMA, interface, init sequence
   
5. If Stage 1 FAILS:
   - Fix issues
   - Re-review
   - Don't proceed until APPROVED

6. Stage 2 Review: Code Quality
   - Use prompts/code-quality.md
   - Check MISRA C, DRY, YAGNI
   
7. If Stage 2 FAILS:
   - Fix issues
   - Re-review
   - Don't proceed until APPROVED

8. Both stages APPROVED:
   - Mark todo: completed
   - Commit changes

4. After All Tasks

Dispatch final review for entire implementation

5. Transition to Verification

All tasks complete. Invoking embedded-verification for build-flash-monitor loop.

REQUIRED: Invoke embedded-verification next.

Implementation Prompt

Use prompts/driver-generator.md for code generation:

Read the full file on GitHub · 163 lines

Changes

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.

  1. 2d ago First seen · 163 lines · 28 tokens per session scan A 32e3a0ba8889

Subscribe to this mod's changes

embedded-implementation is a skill published in the GitHub repository lhbsaa/embedded-dev-skill (9 stars, last pushed 1mo ago), licensed MIT. It adds 28 tokens to every session and 921 once invoked, about $0.0001 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 2026-08-31.

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