pt-fuzzing-binary-protocol

pt-fuzzing-binary-protocol is a skill for Claude Code, Codex from santosomar/ethical-hacking-agent-skills. It costs 52 tokens per session (463 once invoked), scanned A, original, Apache-2.0.

An authorized testing method that feeds malformed binary files or network messages to parsers and protocol handlers. It looks for crashes, hangs, memory-safety defects, and denial-of-service conditions.

In plain words
What is it for?
Testing file parsers, protocol handlers, and services with representative and boundary-case inputs. It also helps group failures, minimize reproducing inputs, assess impact, and guide fixes.
Why use it?
It helps reveal how software behaves with unexpected input before attackers or corrupted data do. Controlled testing also produces smaller examples that are easier to investigate.

Skill for Claude CodeCodex

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

Good fit Testing file parsers, protocol handlers, and services with representative and boundary-case inputs. It also helps group failures, minimize reproducing inputs, assess impact, and guide fixes.

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Install with agentmods
npx agentmods add skills/santosomar/ethical-hacking-agent-skills/pt-fuzzing-binary-protocol
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 santosomar/ethical-hacking-agent-skills --skill pt-fuzzing-binary-protocol
Clone the repo
git clone --depth 1 https://github.com/santosomar/ethical-hacking-agent-skills

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 pt-fuzzing-binary-protocol

README.md
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Your own site
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agentmods 80×15 button for pt-fuzzing-binary-protocol

Your own site · 80×15
<a href="https://agentmods.dev/skills/santosomar/ethical-hacking-agent-skills/pt-fuzzing-binary-protocol"><img src="https://agentmods.dev/badge/skills/santosomar/ethical-hacking-agent-skills/pt-fuzzing-binary-protocol.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 463 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 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 $0.00052 $0.00463
Opus 5 $0.00026 $0.00231
Sonnet 5 $0.00010 $0.00093
Haiku 4.5 $0.00005 $0.00046

Measured 10d ago against content hash 1e89bf2b2894, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

pt-fuzzing-binary-protocol 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 10d 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/pt-fuzzing-binary-protocol/SKILL.md · 74 lines

What it actually says

Binary and Protocol Fuzzing

Authorized Use Only

Binary/protocol fuzzing can crash services and devices. Use only in approved environments with rollback and recovery plans. Never run uncontrolled campaigns against production systems.

Objectives

  1. Discover crash, hang, and memory-safety conditions.
  2. Validate robustness of protocol and file-format parsers.
  3. Deliver minimized proof cases and remediation priorities.

Workflow

  1. Prepare target and harness:
    • Define target binary/service and exact version
    • Build repeatable harness with deterministic input path
    • Configure sanitizers/debug symbols where possible
  2. Seed and dictionary strategy:
    • Collect representative valid corpus
    • Add protocol/file dictionaries and boundary-value cases
  3. Run controlled fuzzing campaign:
    • Configure time budgets, resource limits, and crash retention
    • Monitor for crashes, hangs, OOM, and sanitizer signals
  4. Triage and minimize:
    • Deduplicate by stack/signature
    • Reduce to minimal reproducer inputs
    • Confirm exploitability class and likely impact
  5. Remediation guidance:
    • Parser hardening and defensive bounds checking
    • Safer decoding patterns and dependency upgrades
    • Regression harness for fixed cases

Output Template

# Binary/Protocol Fuzzing Output

## Campaign Setup
- Target and version:
- Harness:
- Sanitizers/instrumentation:
- Runtime limits:

## Crash and Hang Findings
- Finding ID:
  - Trigger input:
  - Signal/exception:
  - Stack/signature:
  - Reproduction steps:
  - Impact classification:
  - Suggested fix:

## Triage Summary
- Unique findings:
- Duplicates removed:
- Highest-risk classes:

## Regression Plan
- Repro corpus location:
- Required tests after patch:

Quality Checks

  • Each finding has a minimized reproducer.
  • Crash signatures are deduplicated and prioritized.
  • Fix recommendations map to concrete parser hardening actions.
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. 10d ago First seen · 74 lines · 52 tokens per session scan A 1e89bf2b2894

Subscribe to this mod's changes

pt-fuzzing-binary-protocol is a skill published in the GitHub repository santosomar/ethical-hacking-agent-skills (24 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 52 tokens to every session and 463 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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