zero-state-return

zero-state-return is a skill for Claude Code, Codex from PlamenTSV/plamen. It costs 21 tokens per session (2,838 once invoked), scanned A, original, MIT.

A security-analysis skill for Aptos Move protocols that use vaults, pools, or staking mechanisms. It examines what happens when assets or shares start at zero or return to zero after users exit.

In plain words
What is it for?
Use it to inspect initial deposits, full withdrawals, empty liquidity pools, residual assets, and re-entry conditions in Move code.
Why use it?
Zero-value states can expose unexpected behavior, leftover assets, or re-entry weaknesses if the protocol does not handle them correctly.

Skill for Claude CodeCodex

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/plamentsv/plamen/zero-state-return
Any agent
npx skills add PlamenTSV/plamen --skill zero-state-return
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 zero-state-return

README.md
[![agentmods](https://agentmods.dev/badge/skills/plamentsv/plamen/zero-state-return.svg)](https://agentmods.dev/skills/plamentsv/plamen/zero-state-return)
Your own site
<a href="https://agentmods.dev/skills/plamentsv/plamen/zero-state-return"><img src="https://agentmods.dev/badge/skills/plamentsv/plamen/zero-state-return.svg" alt="Measured on agentmods" height="20"></a>
Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,838 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.

ModelPer sessionOnce invoked
Fable 5 $0.00021 $0.02838
Opus 5 $0.00010 $0.01419
Sonnet 5 $0.00004 $0.00568
Haiku 4.5 $0.00002 $0.00284

Measured 4d ago against content hash cdd1f2e03835, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

zero-state-return 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 4d 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/aptos/zero-state-return/SKILL.md · 244 lines

How it starts

The opening of the file, as written. The whole thing — 244 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ZERO_STATE_RETURN Skill

Trigger Pattern: Vault/pool/first-depositor pattern detected Inject Into: Depth-edge-case Purpose: Analyze zero-state transitions in Aptos Move protocols -- initial zero state, return to zero after operations, residual assets, and re-entry vulnerabilities

Overview

This skill covers BOTH initial zero state AND return-to-zero-state analysis:

  • Protocol initialization and first deposit conditions
  • Protocol returning to zero after normal operations
  • Residual assets when supply returns to zero
  • Re-entry vulnerabilities after full exit

1. Identify Zero-State Transitions

Find all vault/pool/staking mechanisms and their zero-state boundaries:

State Resource / Variable Zero Condition Trigger Code Location
Total shares {resource.total_supply} == 0 All users withdrew/burned {module:line}
Total assets {resource.total_assets} == 0 No funds deposited {module:line}
Pool liquidity {resource.reserves} Both reserves == 0 All LP withdrawn {module:line}
Staking pool {resource.total_staked} == 0 All unstaked {module:line}

For each state: what is the protocol behavior when this condition is true?

2. First Depositor Analysis

Can the first depositor manipulate share price?

2a. Share Minting Formula at Zero State

Protocol Formula When totalShares == 0 First Deposit Behavior
{name} shares = amount * totalShares / totalAssets {special case?} {describe}

Classic first depositor attack on Aptos:

  1. First depositor deposits minimal amount (e.g., 1 unit)
  2. Attacker directly deposits tokens to the protocol's FungibleStore (unsolicited -- bypasses accounting)
  3. Exchange rate inflates: totalAssets increases but totalShares stays at 1
  4. Next depositor receives 0 shares due to rounding (their deposit amount < inflated share price)
  5. First depositor withdraws, capturing the second depositor's funds

Read the full file on GitHub · 244 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. 4d ago First seen · 244 lines · 21 tokens per session scan A cdd1f2e03835

Subscribe to this mod's changes

zero-state-return is a skill published in the GitHub repository PlamenTSV/plamen (281 stars, last pushed 1mo ago), licensed MIT. It adds 21 tokens to every session and 2,838 once invoked, about $0.0001 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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