What is kverus-common?

A shared reference library for writing and checking Rust code in Verus, a tool for formally verifying program behavior. It also documents practices for the Asterinas and VOSTD projects.

Use it alongside other KVerus skills when fixing verification failures, adding specifications, handling ghost or tracked values, modeling external APIs, or reviewing trusted boundaries.

It provides targeted guidance for common Verus problems instead of treating every syntax, proof, loop, or trusted-code question from scratch. It is a reference layer rather than a standalone repair command.

kverus-common — Skill for Codex by asterinas: A shared reference library for writing and checking Rust…

Install

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.

agentmods

npx agentmods add skills/asterinas/kverus/kverus-common

Any agent

npx skills add asterinas/KVerus --skill kverus-common

Clone the repo

git clone --depth 1 https://github.com/asterinas/KVerus

Made for: Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/asterinas/kverus/kverus-common.svg)](https://agentmods.dev/skills/asterinas/kverus/kverus-common)

Your own site

<a href="https://agentmods.dev/skills/asterinas/kverus/kverus-common"><img src="https://agentmods.dev/badge/skills/asterinas/kverus/kverus-common.svg" alt="Measured on agentmods" height="20"></a>

Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,238 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00053	$0.01238
Opus 5	$0.00026	$0.00619
Sonnet 5	$0.00011	$0.00248
Haiku 4.5	$0.00005	$0.00124

Measured 2d ago against content hash 5c78fde17c37, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

kverus-common 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 2d 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.

skills/kverus-common/SKILL.md · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

KVerus Common

Use this skill as a shared reference layer for KVerus tasks. It does not define a standalone repair workflow; pair it with task skills such as kverus-fix, kverus-spec, or kverus-migrate.

Loading Rule

Before editing Verus code, load only the relevant reference:

Syntax or mode confusion: read references/verus-syntax-quickref.md.
Verification repair strategy or error triage: read references/common-errors.md.
Proof construction, quantifiers, arithmetic, bit-vector, or SMT context issues: read the relevant file under references/ — proof-localization.md, quantifiers.md, solvers.md, arithmetic-lemmas.md, calc-blocks.md, opaque-reveal.md, lemma-shape.md, or set-reasoning.md.
Loop or recursive proof failures: read references/invariants.md.
ghost, tracked, Tracked<T>, Ghost<T>, @, or erasure issues: read references/ghost-tracked.md.
Axiom-like declarations, external API specifications, trusted boundaries, or proof cleanup: read references/proof-engineering-and-trust-boundaries.md.
Missing or incomplete vstd specifications for std, core, or alloc APIs: read references/std-external-specifications.md together with references/proof-engineering-and-trust-boundaries.md.
Concurrency, invariants, permissions, or state-machine navigation: read references/tokenized-state-machine.md.
Verus-unsupported features, forced rewrites, or trait associated constant limitations: read references/unsupported-features/index.md, then load the relevant topic file from that directory.

Project Policy

Read the target workspace's instructions before applying these general references. For an Asterinas/VOSTD workspace, read AGENTS.md and docs/coding-guidelines/README.md, then follow the relevant linked guideline.

Source Path Resolution

Resolve every citation from the target workspace; never assume a machine-specific absolute path.

Inspect the verification command, repository scripts and configuration, environment, and submodule metadata to locate the active Verus checkout.
Accept a candidate as the Verus root only when it contains the cited source/docs/guide/src and source/vstd trees.
Resolve source/docs/..., source/vstd/..., and examples/... relative to the discovered Verus root. Resolve project paths relative to the target workspace root.
Keep citations in these root-relative forms instead of resolving them against the skill directory. Confirm a cited file exists before relying on it; if no active checkout can be located, report the unresolved citation rather than inventing a path.

Read the full file on GitHub · 56 lines

Files

What ships with it

29 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.

Changes

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.

2d ago Changed · +7 lines · -20 tokens per session 5c78fde17c37
6d ago First seen · 49 lines · 73 tokens per session scan A 1e9111c4131b

Subscribe to this mod's changes

kverus-common is a skill published in the GitHub repository asterinas/KVerus (23 stars, last pushed 2d ago), licensed MIT. It adds 53 tokens to every session and 1,238 once invoked, about $0.0003 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 2026-08-30.

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kverus-common