fuzz-tester

fuzz-tester is an agent for coding agents from OPCFoundation/UA-.NETStandard. It costs 333 tokens per session (10,067 once invoked), scanned B, original, no licence file.

An automated tester for OPC UA software, a communication standard used by industrial devices and systems. It sends unusual or malformed data to encoder, certificate, and network code to look for crashes, timeouts, and slow inputs.

In plain words
What is it for?
Use it to fuzz-test OPC UA encoders, certificates, and network handling, then investigate and fix the problems it finds.
Why use it?
It finds failures that ordinary tests may miss and helps investigate each new problem by reproducing it and adding a test input.

Agent

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 agents/opcfoundation/ua-.netstandard/fuzz-tester
Clone the repo
git clone --depth 1 https://github.com/OPCFoundation/UA-.NETStandard

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 fuzz-tester

README.md
[![agentmods](https://agentmods.dev/badge/agents/opcfoundation/ua-.netstandard/fuzz-tester.svg)](https://agentmods.dev/agents/opcfoundation/ua-.netstandard/fuzz-tester)
Your own site
<a href="https://agentmods.dev/agents/opcfoundation/ua-.netstandard/fuzz-tester"><img src="https://agentmods.dev/badge/agents/opcfoundation/ua-.netstandard/fuzz-tester.svg" alt="Measured on agentmods" height="20"></a>
Per session 333 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 10,067 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 1 finding. Scan, not verified.
Origin unknown 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 $0.00333 $0.10067
Opus 5 $0.00167 $0.05033
Sonnet 5 $0.00067 $0.02013
Haiku 4.5 $0.00033 $0.01007

Measured 6d ago against content hash 5299ac7f1691, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade B, and why

fuzz-tester scanned grade B with 1 finding 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 6d 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

needs sudo and a compile toolchain (`fuzzing/Scripts/install.sh` is the
.github/agents/fuzz-tester.agent.md · 797 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 6d ago First seen · 797 lines · 333 tokens per session scan B 5299ac7f1691

Subscribe to this mod's changes

fuzz-tester is an agent published in the GitHub repository OPCFoundation/UA-.NETStandard (2,381 stars, last pushed today), with no licence file. It adds 333 tokens to every session and 10,067 once invoked, about $0.0017 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.