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 JuanMarchetto/agent-skills --skill c-to-rust-migrationgit clone --depth 1 https://github.com/JuanMarchetto/agent-skillsWrote 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/juanmarchetto/agent-skills/c-to-rust-migration)<a href="https://agentmods.dev/skills/juanmarchetto/agent-skills/c-to-rust-migration"><img src="https://agentmods.dev/badge/skills/juanmarchetto/agent-skills/c-to-rust-migration/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/juanmarchetto/agent-skills/c-to-rust-migration"><img src="https://agentmods.dev/badge/skills/juanmarchetto/agent-skills/c-to-rust-migration.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 | $0.00084 | $0.01272 |
| Opus 5 | $0.00042 | $0.00636 |
| Sonnet 5 | $0.00017 | $0.00254 |
| Haiku 4.5 | $0.00008 | $0.00127 |
Grade A, and why
c-to-rust-migration 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 — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.
C to Rust Migration
Complete pipeline for migrating C/C++ codebases to safe, idiomatic Rust. Covers analysis, conversion, and validation in three phases.
Pipeline
C/C++ Source
|
Phase 1: ANALYZE
| Classify difficulty (easy/medium/hard)
| Detect patterns (pointers, macros, goto, unions)
| Plan conversion strategy
|
Phase 2: CONVERT
| Apply migration patterns
| Memory management → ownership/borrowing
| Error codes → Result<T, E>
| Pointer arithmetic → slices/iterators
| Quality gate: re-translate if >5 unsafe blocks
|
Phase 3: VALIDATE
| Compilation check (edition 2024)
| Unsafe minimization (target: 0 for easy/medium)
| Clippy with 0 warnings
| Differential testing (same I/O as original C)
| Idiomatic score calculation
|
Safe, Idiomatic Rust
Phase 1: Analysis
Classify each function by migration difficulty:
| Difficulty | Patterns | Strategy |
|---|---|---|
| Easy | Pure functions, simple arithmetic, no pointers, <30 lines | Direct translation, should produce 0 unsafe |
| Medium | Pointer parameters, simple structs, bounded arrays, malloc with clear ownership | Translate with ownership patterns, minimize unsafe |
| Hard | void*, function pointers, unions, goto, complex lifetimes, macro-heavy | May need C2Rust as starting point, then iterative cleanup |
Hard signals (any one → Hard): goto, setjmp/longjmp, variadic functions, inline assembly, complex #define macros with side effects.
See references/analysis-patterns.md for the complete pattern catalog.
Phase 2: Conversion Patterns
Core translations:
| C Pattern | Rust Pattern |
|---|---|
malloc/free |
Vec, Box, or stack allocation |
char* strings |
&str, String, CStr |
int error codes |
Result<T, Error> with thiserror |
NULL checks |
Option<T> |
| Array + length params | Slices (&[T]) |
void* |
Generics or enum dispatch |
| Function pointers | Fn traits or enum dispatch |
struct with init/free |
impl with new() + Drop |
| Global mutable state | OnceLock, Mutex, or dependency injection |
goto cleanup |
Drop guards or ? operator |
What ships with it
6 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 · 126 lines · 84 tokens per session scan A 165d0c8d4cc0
c-to-rust-migration is a skill published in the GitHub repository JuanMarchetto/agent-skills (5 stars, last pushed 5mo ago), licensed MIT. It adds 84 tokens to every session and 1,272 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 2026-08-31.
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