Borrowing it
Nothing to install: this file belongs to open-software-network/os-clovy. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/open-software-network/os-clovy/main/.agents/skills/os-rust-backend/SKILL.mdgit clone --depth 1 https://github.com/open-software-network/os-clovyWrote 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/open-software-network/os-clovy/os-rust-backend)<a href="https://agentmods.dev/skills/open-software-network/os-clovy/os-rust-backend"><img src="https://agentmods.dev/badge/skills/open-software-network/os-clovy/os-rust-backend/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/open-software-network/os-clovy/os-rust-backend"><img src="https://agentmods.dev/badge/skills/open-software-network/os-clovy/os-rust-backend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00246 | $0.04434 |
| Opus 5.5 | $0.00098 | $0.01774 |
| Sonnet 5.5 | $0.00049 | $0.00887 |
| Haiku 4.5 | $0.00025 | $0.00443 |
Grade A, and why
os-rust-backend 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 1mo 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 — 260 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Open Software backend (Rust)
This skill captures the house style used by os-accounts and os-platform
(the fellow codebase). Both repositories were built independently and
converged on the same shape — that convergence is not coincidence, it is the
recipe. Follow it when starting a new service or extending one of these two, and
your code will look at home in either repo.
The recipe in one sentence: a Cargo workspace of small, pointed crates where the domain doesn't know about HTTP, services don't know about Postgres, the API doesn't know about Privy or Stripe, and the binary wires it all together.
Read this file, then open the reference that matches the work.
Route the request first
| If the user asks for... | Open first | Non-negotiable |
|---|---|---|
| "scaffold a new backend" / "start a service like os-accounts" | workspace-layout.md | Seven crates, exact names: domain / services / persistence / providers / config / api / app. |
| "add an endpoint" / "what should this handler return" | api-envelope.md | Every endpoint returns ApiResponse<T>. Error code bands map to HTTP status. |
"where do I read DATABASE_URL" / "add a new config knob" |
config-and-providers.md | Never std::env::var. Add a typed field to *-config, plumb it down. |
| "wire up Stripe / Privy / a new external API" | config-and-providers.md | Define a trait in *-domain, implement in *-providers, inject Arc<dyn Trait> in app/main.rs. |
| "add a table / write a query / run a migration" | persistence.md | sqlx + MIGRATIONS!. Repository structs in *-persistence. Enum columns get CHECK constraints. |
| "test the new endpoint" / "how do I mock Privy" | testing.md | Unit = no I/O; integration = real Postgres + wiremock; e2e = HTTP against a deployed service. |
| "containerize it for GHCR" | dockerfile.md | cargo-chef multi-stage, debian-slim runtime, non-root user, ENTRYPOINT is the binary. |
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.
- 1mo ago First seen · 260 lines · 246 tokens per session scan A fd9c4c34848c
os-rust-backend is a skill published in the GitHub repository open-software-network/os-clovy (356 stars, last pushed 2d ago), licensed MIT. It adds 246 tokens to every session and 4,434 once invoked, about $0.0010 per session on Opus 5.5. 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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