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.
git clone --depth 1 https://github.com/briangmilnes/APAS-VERUSWrote 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/rules/briangmilnes/apas-verus/no-cfg-not-verus-keep-ghost)<a href="https://agentmods.dev/rules/briangmilnes/apas-verus/no-cfg-not-verus-keep-ghost"><img src="https://agentmods.dev/badge/rules/briangmilnes/apas-verus/no-cfg-not-verus-keep-ghost/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/rules/briangmilnes/apas-verus/no-cfg-not-verus-keep-ghost"><img src="https://agentmods.dev/badge/rules/briangmilnes/apas-verus/no-cfg-not-verus-keep-ghost.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 | $0.00577 | $0.00577 |
| Opus 5 | $0.00289 | $0.00289 |
| Sonnet 5 | $0.00115 | $0.00115 |
| Haiku 4.5 | $0.00058 | $0.00058 |
Grade A, and why
no-cfg-not-verus-keep-ghost 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 8d 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 — 48 lines — stays where its author put it; the contents beside it link to each section on GitHub.
No verus_keep_ghost Antipatterns
There must be no use of verus_keep_ghost in lib.rs. Period.
Antipattern 1: Duplicate function implementations
NEVER create #[cfg(not(verus_keep_ghost))] duplicate implementations of functions that already exist inside verus! {} blocks.
This is an old antipattern from before the codebase was fully verusified. It duplicated every function — once inside verus! {} with specs, and once outside with #[cfg(not(verus_keep_ghost))] for cargo test compatibility.
Why it's wrong
- The duplicate drifts out of sync with the verified version
- It doubles maintenance burden
- It's no longer needed — the verusified code compiles and runs under both Verus and cargo
What to do instead
- Put the implementation inside
verus! {}with its specs - That's it. No duplicate needed.
Antipattern 2: Nightly feature gates
NEVER add #![cfg_attr(verus_keep_ghost, feature(...))] to lib.rs.
Lines like #![cfg_attr(verus_keep_ghost, feature(sized_hierarchy))] are cargo-cult copies from vstd's own vstd.rs. vstd needs nightly features for deep Rust intrinsics work. User crates do not — Verus links vstd as a precompiled dependency.
Antipattern 3: Module gating in lib.rs
NEVER use verus_keep_ghost or not(verus_keep_ghost) to conditionally compile module blocks in lib.rs. This includes:
#[cfg(all(..., not(verus_keep_ghost)))] pub mod ChapNN { ... }— hiding a chapter from Verus- Split declarations — two
pub mod ChapNNblocks, one gatedverus_keep_ghost, onenot(verus_keep_ghost), with different file lists
If a chapter doesn't verify, that's the project's current state (PBOGH). Every chapter gets one unconditional pub mod ChapNN block containing all its files. Verus reports errors on unverified code until it's fixed.
If you see it
If you encounter any of these antipatterns, remove them:
- Duplicate function bodies: delete the
#[cfg(not(verus_keep_ghost))]block. - Nightly feature gates: delete the
#![cfg_attr(verus_keep_ghost, ...)]line. - Module gating: merge split
pub modblocks into one unconditional block with all files.
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.
- 8d ago First seen · 48 lines · 577 tokens per session scan A 89bccdbf6c0c
no-cfg-not-verus-keep-ghost is a cursor rule published in the GitHub repository briangmilnes/APAS-VERUS (10 stars, last pushed 1mo ago), licensed MIT. It adds 577 tokens to every session, about $0.0029 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 2026-09-03.
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