Borrowing it
Nothing to install: this file belongs to luisfurquim/wings. 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/luisfurquim/wings/main/.claude/skills/sec-minimal-trusted-code/SKILL.mdgit clone --depth 1 https://github.com/luisfurquim/wingsWrote 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/luisfurquim/wings/sec-minimal-trusted-code)<a href="https://agentmods.dev/skills/luisfurquim/wings/sec-minimal-trusted-code"><img src="https://agentmods.dev/badge/skills/luisfurquim/wings/sec-minimal-trusted-code/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/luisfurquim/wings/sec-minimal-trusted-code"><img src="https://agentmods.dev/badge/skills/luisfurquim/wings/sec-minimal-trusted-code.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 | $0.00052 | $0.00723 |
| Opus 5.5 | $0.00021 | $0.00289 |
| Sonnet 5.5 | $0.00010 | $0.00145 |
| Haiku 4.5 | $0.00005 | $0.00072 |
Grade A, and why
sec-minimal-trusted-code 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 — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Minimal Trusted Code (djb)
Source philosophy: D. J. Bernstein, "Some thoughts on security after ten years of qmail 1.0". Security holes are bugs; the bug rate scales with the amount of code that must be correct for security to hold. Three levers, in order of power:
- Eliminate code. The most secure line is the one never written. Before adding a feature, ask what it costs in lines-that-must-be-right, not just in lines.
- Eliminate bugs in the code that remains. Smaller functions, explicit data flow, no hidden global state, exhaustive handling of every branch.
- Eliminate trusted code. Code may exist and still be untrusted: move risky work to where a bug cannot violate security.
How this maps to wings
- Build-time vs runtime split is the qmail pattern.
gen_i18ndoes all HTML/flex parsing at build time; the wasm runtime consumes pre-indexed JSON. Keep parsing OUT of the runtime. Any feature that tempts you to parse rich syntax inside the browser belongs incmd/gen_i18norcmd/buildinstead. - Misuse-resistant APIs (NaCl style). One call that is correct by default
beats a toolkit of sharp primitives. Existing good examples to imitate:
wi18n.SetCatalogPublicKey(one call → all-or-nothing signature enforcement),ApplySkinreturning typed errors instead of panicking. A new API should have no "insecure but convenient" mode. - Dependencies are trusted code you didn't write. go.mod currently has 6
direct requires. Every candidate dep must answer: what does it replace, how
many transitive deps does it drag in (
go mod graph), could 50 lines of our own code do it? (See sec-supply-chain.) - Config options multiply states. Every
WINGS_*env var or wings.json key doubles the test matrix. Prefer one good default over a knob.
Checklist for a new feature/API
- Could this live at build time instead of runtime?
- Is there a single entry point that is safe by default (no flag that disables verification, escaping, or validation)?
- Does the public surface return
errorinstead of panicking (input validation contract of this repo)? - Net lines of security-relevant code: did it shrink or grow? If it grew, is the growth isolated in one package with a narrow interface?
- Zero new dependencies, or a written justification.
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 · 57 lines · 52 tokens per session scan A 3528b5c6e486
sec-minimal-trusted-code is a skill published in the GitHub repository luisfurquim/wings (29 stars, last pushed 2mo ago), licensed MPL-2.0. It adds 52 tokens to every session and 723 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 2026-08-30.
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