package-version-safety

package-version-safety is a skill for Claude Code, Codex from PlamenTSV/plamen. It costs 34 tokens per session (2,782 once invoked), scanned A, original, MIT.

A Sui Move security-audit guide for package upgrades. Sui packages are blockchain programs that cannot be replaced in place, so each upgrade creates a new version while older versions remain available.

In plain words
What is it for?
Reviewing upgrade policies, UpgradeCap ownership, package version lineages, and migration handling.
Why use it?
It helps identify risks from uncontrolled upgrade keys, incompatible versions, and shared objects being used by multiple package versions.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Reviewing upgrade policies, UpgradeCap ownership, package version lineages, and migration handling.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/plamentsv/plamen/package-version-safety
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.

Any agent
npx skills add PlamenTSV/plamen --skill package-version-safety
Clone the repo
git clone --depth 1 https://github.com/PlamenTSV/plamen

Made for: Claude Code, 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.

agentmods badge for package-version-safety

README.md
[![agentmods](https://agentmods.dev/badge/skills/plamentsv/plamen/package-version-safety/github.svg)](https://agentmods.dev/skills/plamentsv/plamen/package-version-safety)
Your own site
<a href="https://agentmods.dev/skills/plamentsv/plamen/package-version-safety"><img src="https://agentmods.dev/badge/skills/plamentsv/plamen/package-version-safety/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.

agentmods 80×15 button for package-version-safety

Your own site · 80×15
<a href="https://agentmods.dev/skills/plamentsv/plamen/package-version-safety"><img src="https://agentmods.dev/badge/skills/plamentsv/plamen/package-version-safety.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 34 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,782 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 4 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high YARA Match · line 13
    YARA rule matched a hack tool or exploit indicator (offensive tools, reconnaissance, privilege escalation, or exploit frameworks).
    Fix: Remove offensive tool references and exploit code. Legitimate agent skills should not contain penetration testing tools, exploit frameworks, or reconnaissance utilities.
  • high Anti-Refusal · line 177
    Skill instructs the agent to never refuse or to always comply. Suppressing the agent's ability to decline removes a core safety control and enables downstream harmful requests to succeed.
    Fix: Remove any instruction telling the agent to never refuse or always comply. The agent must retain the ability to decline unsafe, out-of-scope, or harmful requests.
  • high Prompt Injection · line 181
    This pattern attempts to override system instructions or ignore safety constraints. Without LLM analysis, manual review is recommended.
    Fix: Remove or rewrite any text that instructs the agent to ignore prompts, override safety rules, or trust unverified content. Ensure skill content cannot be injected to alter agent behavior.
  • high Rogue Agent · line 181
    Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.
    Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
How audits are shown
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00034 $0.02782
Opus 5 $0.00017 $0.01391
Sonnet 5 $0.00007 $0.00556
Haiku 4.5 $0.00003 $0.00278

Measured 7d ago against content hash a648d3fce350, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

package-version-safety 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 7d 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.

agents/skills/sui/package-version-safety/SKILL.md · 243 lines

How it starts

The opening of the file, as written. The whole thing — 243 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: PACKAGE_VERSION_SAFETY (Sui)

Trigger Pattern: PACKAGE_UPGRADE flag (UpgradeCap detected, multiple package versions, upgrade policy references) Inject Into: Breadth agents, depth-external Finding prefix: [PV-N] Rules referenced: R4, R8, R9, R10

Sui packages are immutable once published. "Upgrading" a package means publishing a NEW version at a NEW on-chain address, linked to the original via the UpgradeCap lineage. The old version's code remains callable forever. This creates a fundamentally different upgrade risk model compared to EVM proxies: instead of replacing logic in-place, Sui packages accumulate versions -- and shared objects may be accessible by ALL versions simultaneously.


Trigger Patterns

UpgradeCap|upgrade_policy|package::make_immutable|compatible|additive|dep_only|version|
migrate|old_version|new_version

Step 1: Upgrade Policy Inventory

For each package in scope:

# Package UpgradeCap Location UpgradeCap Holder Has store? Upgrade Policy Destroyed?
1 {pkg_name} {init function:line} {address / shared / wrapped in governance} YES/NO {compatible/additive/dep_only} YES (immutable) / NO

Checks:

  • Where is UpgradeCap stored?

    • Owned by deployer address: Single point of failure. Key loss -> permanent immutability. Key theft -> attacker can upgrade.
    • Shared object: DANGEROUS -- anyone can pass it to upgrade functions.
    • Wrapped in governance object: Good pattern -- upgrade requires governance approval.
    • Destroyed via make_immutable(): Package is permanently immutable. No upgrade risk.
    • Transferred to @0x0 or burn address: Effectively immutable.
  • Can UpgradeCap be transferred?

    • UpgradeCap has key + store by default -> freely transferable via public_transfer.
    • Is there a custom wrapper restricting transfer? (e.g., GovernanceCap wrapping UpgradeCap)
    • If transferable and held by EOA -> attacker stealing key can transfer UpgradeCap.

Read the full file on GitHub · 243 lines

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.

  1. 7d ago First seen · 243 lines · 34 tokens per session scan A a648d3fce350

Subscribe to this mod's changes

package-version-safety is a skill published in the GitHub repository PlamenTSV/plamen (295 stars, last pushed 3d ago), licensed MIT. It adds 34 tokens to every session and 2,782 once invoked, about $0.0002 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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