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 fusengine/agents --skill rust-web-backendgit clone --depth 1 https://github.com/fusengine/agentsWrote 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/fusengine/agents/rust-web-backend)<a href="https://agentmods.dev/skills/fusengine/agents/rust-web-backend"><img src="https://agentmods.dev/badge/skills/fusengine/agents/rust-web-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/fusengine/agents/rust-web-backend"><img src="https://agentmods.dev/badge/skills/fusengine/agents/rust-web-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 | $0.00049 | $0.01404 |
| Opus 5.5 | $0.00020 | $0.00562 |
| Sonnet 5.5 | $0.00010 | $0.00281 |
| Haiku 4.5 | $0.00005 | $0.00140 |
Grade A, and why
rust-web-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 22d 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 — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
It also names the honest alternatives — sea-orm for an ActiveRecord-style ORM, diesel for a mature but synchronous alternative needing spawn_blocking — and structured observability via tracing.
Out of scope: raw async/concurrency primitives (channels, locks, task spawning) belong to rust-async-concurrency; cross-domain crate selection belongs to rust-ecosystem-crates.
Rust Web Backend
Agent Workflow (MANDATORY)
Before building the service, spawn in parallel:
- fuse-ai-pilot:explore-codebase — detect the existing router, state, and DB layer
- fuse-ai-pilot:research-expert — verify current axum/sqlx APIs via Context7/Exa (axum 0.8 changed several APIs)
- mcp__context7__query-docs — pull exact extractor/handler signatures
After building, run fuse-ai-pilot:sniper.
The 2026 standard stack
| Layer | Crate | Why |
|---|---|---|
| Runtime | tokio | De-facto async runtime; everything targets it |
| HTTP framework | axum 0.8.x | Tower-based, extractor ergonomics, minimal magic |
| Middleware | tower / tower-http | Composable layers (trace, cors, timeout, compression) |
| Database | sqlx 0.9 | Async, query! compile-time-checked SQL, no DSL; Postgres/MySQL/SQLite |
| Observability | tracing + tracing-subscriber | Structured, async-aware spans and logs |
Honest alternatives: sea-orm (ActiveRecord-style ORM, higher-level than sqlx), diesel 2.x (mature, synchronous — needs spawn_blocking or a sync pool in async apps). Prefer sqlx for the standard stack; reach for these only when their model fits.
What ships with it
5 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.
- 22d ago Changed 2b6f0050f93b
- 1mo ago First seen · 130 lines · 49 tokens per session scan A c1803dec0081
rust-web-backend is a skill published in the GitHub repository fusengine/agents (33 stars, last pushed 7d ago), licensed MIT. It adds 49 tokens to every session and 1,404 once invoked, about $0.0002 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 2026-09-03.
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