Fabro is an open-source system for defining software-development workflows as graphs that AI coding agents execute with verification steps and opportunities for human intervention. Expert engineers and teams use it to coordinate agent tasks, combine models, share version-controlled processes, run agents in isolated sandboxes, and queue work through an API server. The catalogue entries are Fabro-specific skills, instructions, hooks, and settings for working with the system.
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 fabro-sh/fabro --skill rust-style-guidegit clone --depth 1 https://github.com/fabro-sh/fabroWrote 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/fabro-sh/fabro/rust-style-guide)<a href="https://agentmods.dev/skills/fabro-sh/fabro/rust-style-guide"><img src="https://agentmods.dev/badge/skills/fabro-sh/fabro/rust-style-guide/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/fabro-sh/fabro/rust-style-guide"><img src="https://agentmods.dev/badge/skills/fabro-sh/fabro/rust-style-guide.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 | $0.00100 | $0.00837 |
| Opus 5.5 | $0.00040 | $0.00335 |
| Sonnet 5.5 | $0.00020 | $0.00167 |
| Haiku 4.5 | $0.00010 | $0.00084 |
Grade A, and why
rust-style-guide 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 — 45 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Rust Style Guide
Use this skill to apply the project's Rust style conventions while writing, reviewing, refactoring, or configuring Rust code.
Location: This skill's supporting files live in
.fabro/skills/rust-style-guide/at the repository root. Every linked path below (guidelines.md,guidelines/*.md,workflows/*.md) is relative to that directory. Read them with that prefix — e.g..fabro/skills/rust-style-guide/guidelines.md.
Supporting Files
- guidelines.md - index of Rust style policy pages. Load this for ordinary Rust work, then load only the guideline pages relevant to the task.
- workflows/new-rust-project.md - workflow for creating or configuring a new Rust crate, workspace, CLI, library, service, or application.
- workflows/reusable-library-release.md - workflow for verifying reusable library releases, feature combinations, dependency checks, and out-of-box builds.
- workflows/performance-investigation.md - workflow for measuring, profiling, and changing performance-sensitive Rust code.
- workflows/code-review-refactor.md - workflow for reviewing, refactoring, or changing existing Rust code.
Routing Examples
| Task | Load |
|---|---|
| Create a new Rust project | workflows/new-rust-project.md, guidelines.md |
| Verify a reusable library release | workflows/reusable-library-release.md, guidelines.md |
| Investigate performance | workflows/performance-investigation.md, guidelines.md |
| Review or refactor code | workflows/code-review-refactor.md, guidelines.md |
| Define a public library error type | guidelines.md, library/application errors, error propagation, public API evolution |
| Handle top-level CLI/application errors | guidelines.md, library/application errors, error propagation, panics |
| Choose enum vs trait vs trait object | guidelines.md, enums vs traits, trait design, public API evolution |
| Add a domain ID or validated value | guidelines.md, newtypes, constructors, validation |
| Write async service code | guidelines.md, async runtime, task lifecycle, shutdown, logging |
| Add instrumentation | guidelines.md, logging and observability, error messages |
| Configure formatting, lints, or tests | guidelines.md, rustfmt, Clippy, Cargo, CI |
| Review unsafe code or macros | guidelines.md, unsafe and macros, public API evolution |
What ships with it
43 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.
- guidelines.md 7.8 KB
- guidelines/async-api-design-and-task-lifecycle.md 5.1 KB
- guidelines/async-runtime-and-when-to-use-async.md 4.4 KB
- guidelines/cancellation-shutdown-and-blocking-work.md 4.7 KB
- guidelines/cargo-workspaces-features-and-dependencies.md 4.1 KB
- guidelines/collections-and-data-structures.md 3.8 KB
- guidelines/concurrency-primitives.md 5.4 KB
- guidelines/constructors-and-builders.md 4.8 KB
- guidelines/control-flow.md 4.6 KB
- guidelines/conversions-getters-and-method-naming.md 3.6 KB
- guidelines/deriving-and-common-trait-implementations.md 3.6 KB
- guidelines/documentation-and-rustdoc-examples.md 3.2 KB
- guidelines/enums-vs-traits-vs-generics-vs-trait-objects.md 3.6 KB
- guidelines/error-propagation-context-and-messages.md 4.1 KB
- guidelines/error-taxonomy-and-layer-boundaries.md 4.0 KB
- guidelines/house-style-and-rust-philosophy.md 3.3 KB
- guidelines/iterators-closures-and-loops.md 3.5 KB
- guidelines/library-errors-vs-application-errors.md 4.3 KB
- guidelines/library-vs-application-conventions.md 3.2 KB
- guidelines/lifetimes.md 2.7 KB
- guidelines/logging-and-observability.md 5.0 KB
- guidelines/modules-visibility-and-re-exports.md 3.4 KB
- guidelines/naming-imports-and-prelude-policy.md 2.2 KB
- guidelines/newtype-pattern-and-semantic-wrappers.md 3.9 KB
- guidelines/option-and-result-idioms.md 3.5 KB
- guidelines/ownership-borrowing-and-clone-policy.md 6.2 KB
- guidelines/panics-unwrap-expect-and-assertions.md 3.6 KB
- guidelines/property-tests-snapshots-benchmarks-and-ci.md 3.7 KB
- guidelines/public-api-evolution.md 4.8 KB
- guidelines/rust-edition-and-msrv.md 2.4 KB
- guidelines/rustc-and-clippy-lints.md 3.6 KB
- guidelines/rustfmt-and-formatting.md 1.6 KB
- guidelines/smart-pointers-and-interior-mutability.md 3.5 KB
- guidelines/struct-design-and-encapsulation.md 2.7 KB
- guidelines/testing-and-doctests.md 4.3 KB
- guidelines/trait-design.md 4.0 KB
- guidelines/typestate-and-state-machines.md 4.1 KB
- guidelines/unsafe-code-and-macros.md 6.0 KB
- guidelines/validation-and-invariants.md 4.3 KB
- workflows/code-review-refactor.md 3.5 KB
- workflows/new-rust-project.md 7.2 KB
- workflows/performance-investigation.md 3.0 KB
- workflows/reusable-library-release.md 4.8 KB
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 · 45 lines · 100 tokens per session scan A 69dc62569421
rust-style-guide is a skill published in the GitHub repository fabro-sh/fabro (1,720 stars, last pushed today), licensed MIT. It adds 100 tokens to every session and 837 once invoked, about $0.0004 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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