fizz-sync

fizz-sync is a skill for Claude Code, Codex from ccashwell/evm-cortex. It costs 77 tokens per session (3,699 once invoked), scanned A, a copy of fizz-sync, MIT.

A synchronization tool for an existing Fizz Solidity fuzzing harness. It compares the harness with changed source code and updates stale properties, handler stubs, and snapshots.

In plain words
What is it for?
Use it after modifying Solidity sources, when tests no longer compile, when adding functions to fuzz, or for a staleness check.
Why use it?
It removes the need to rebuild the entire fuzzing setup after contract functions change or properties become outdated.

Skill for Claude CodeCodex

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

Good fit Use it after modifying Solidity sources, when tests no longer compile, when adding functions to fuzz, or for a staleness check.

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Install with agentmods
npx agentmods add skills/ccashwell/evm-cortex/fizz-sync
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 ccashwell/evm-cortex --skill fizz-sync
Clone the repo
git clone --depth 1 https://github.com/ccashwell/evm-cortex

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 fizz-sync

README.md
[![agentmods](https://agentmods.dev/badge/skills/ccashwell/evm-cortex/fizz-sync/github.svg)](https://agentmods.dev/skills/ccashwell/evm-cortex/fizz-sync)
Your own site
<a href="https://agentmods.dev/skills/ccashwell/evm-cortex/fizz-sync"><img src="https://agentmods.dev/badge/skills/ccashwell/evm-cortex/fizz-sync/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 fizz-sync

Your own site · 80×15
<a href="https://agentmods.dev/skills/ccashwell/evm-cortex/fizz-sync"><img src="https://agentmods.dev/badge/skills/ccashwell/evm-cortex/fizz-sync.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 77 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,699 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.
Origin 100% copy Near-identical to another mod 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 $0.00077 $0.03699
Opus 5.5 $0.00031 $0.01480
Sonnet 5.5 $0.00015 $0.00740
Haiku 4.5 $0.00008 $0.00370

Measured 1mo ago against content hash 5b39aecc3db0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fizz-sync 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.

Origin

This is a copy

100% identical to fizz-sync — 10 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/fizz-sync/SKILL.md · 329 lines

How it starts

The opening of the file, as written. The whole thing — 329 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fizz Sync Skill — fizz-sync

Reconcile a project previously processed by the Fizz skill with a changed source tree. This is the re-use entry point: after the user modifies Solidity sources, fizz-sync detects drift, quarantines stale properties, regenerates drifted handler stubs, and refreshes the snapshot — WITHOUT re-running the full 11-step pipeline.

When to use

  • The source contracts under src/ changed since fizz last ran.
  • A property in PROPERTIES.md fails to compile or references a function that no longer exists.
  • The user added new external functions they want fuzzed.
  • The user wants a "is anything stale?" health check before re-running a campaign.

Parameters

  • SUITE_DIR: Solidity suite directory relative to project root (default: test/fizz). Use the same value that was passed to the fizz skill when the harness was generated.
  • META_DIR: Metadata directory relative to project root (default: fizz_data). Use the same value that was passed to the fizz skill.

Arguments

  • --init — one-time bootstrap: create {META_DIR}/last-run.json from the current state. Use this the first time fizz-sync runs on a project (or when adopting fizz-sync on a project that was fuzzed before the snapshot format existed).
  • --only <Contract> — scope the sync to a single contract name.
  • --apply — actually perform the automatic fixes. Without --apply, fizz-sync runs in dry-run mode and only reports drift.
  • --no-property-quarantine — skip the property quarantine phase (useful if the user wants to handle stale properties manually).

The default (no flags) runs a dry-run drift report.

Preconditions

  • The project must have been processed by the fizz skill at least once. Look for:
    • {PROJECT_ROOT}/{META_DIR}/contracts.json
    • {PROJECT_ROOT}/{META_DIR}/entry-point-selection.json
    • {PROJECT_ROOT}/{SUITE_DIR}/ (suite directory)
  • If any of the above are missing, stop and tell the user to run fizz first.

STEP 0: REBUILD CURRENT ABIS

Read the full file on GitHub · 329 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. 1mo ago First seen · 329 lines · 77 tokens per session scan A 5b39aecc3db0

Subscribe to this mod's changes

fizz-sync is a skill published in the GitHub repository ccashwell/evm-cortex (131 stars, last pushed 17d ago), licensed MIT. It adds 77 tokens to every session and 3,699 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to fizz-sync, differing in 10 lines, and is treated as a copy.

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