safety-critical-patterns SKILL.md skillA

safety-critical-patterns from hermeticormus/libreembed-claude-code is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add hermeticormus/libreembed-claude-code/safety-critical-patterns@git:20260930.ba05790

Pins git:20260930.ba05790 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

hermeticormus/libreembed-claude-code

Path

plugins/safety-critical/skills/safety-critical-patterns/SKILL.md

Versions recorded

4

Latest version

git:20260930.ba05790, committed Sep 30, 2026

First version recorded

Feb 25, 2026

Size

5,139 bytes

Repository stars

51

License

MIT

Safety-critical C patterns: MISRA-compliant fixed-width types, single-exit functions (Rule 15.5), suppression comments, a March-C RAM test, and CRC protection of critical data. Use when writing or reviewing firmware under a functional safety standard.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# safety-critical-patterns

## Knowledge Base

MISRA C compliance and safety-critical firmware patterns.

---

## Pattern 1: MISRA C Compliant Type Annotations

MISRA mandates explicit types. Use `<stdint.h>` types throughout.

```c
/* Non-compliant (implicit types): */
int i;
unsigned char flags;

/* MISRA compliant: */
#include <stdint.h>
#include <stdbool.h>

int32_t  i;
uint8_t  flags;
bool     enable;

/* Rule 7.1: Octal constants */
/* VIOLATION: */
uint8_t val = 010;   /* Octal 8, not decimal 10 */
/* COMPLIANT: */
uint8_t val = 0x08U;

/* Rule 7.2: Unsigned constants must have U suffix */
/* VIOLATION: */
uint32_t x = 100;
/* COMPLIANT: */
uint32_t x = 100U;
```

---

## Pattern 2: Single-Exit Function Pattern (Rule 15.5)

MISRA 15.5: a function shall have a single point of exit.

```c
/* NON-COMPLIANT: multiple returns */
int32_t process(uint8_t *buf, uint32_t len)
{
    if (buf == NULL) { return -1; }
    if (len == 0U)   { return -2; }
    /* process */
    return 0;
}

/* COMPLIANT: single exit */
int32_t process(uint8_t *buf, uint32_t len)
{
    int32_t result = 0;

    if (buf == NULL) {
        result = -1;
    } else if (len == 0U) {
        result = -2;
…

Read the whole file at its exact version.

How to install

mdr add hermeticormus/libreembed-claude-code/safety-critical-patterns@sha256:c383a56a0b937fb1

[![mdr](https://markdownregistry.com/badge/art_iyt2h5iw3r3emrmz.svg)](https://markdownregistry.com/a/art_iyt2h5iw3r3emrmz)

Versions

The registry has recorded 4 versions of this file, between Feb 25, 2026 and Sep 30, 2026, about one every 73 days. Its first recorded version is graded C and its latest A.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_iyt2h5iw3r3emrmz
GET https://markdownregistry.com/api/v1/resolve?ref=hermeticormus/libreembed-claude-code/safety-critical-patterns
GET https://markdownregistry.com/api/v1/blob/c383a56a0b937fb1f8035c52cd4ae08a563b9ec14f4a1f1341f8b61f0cbc695e

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