fuzz

A targeted web-fuzzing workflow that chooses wordlists for finding pages, files, virtual hosts, APIs, parameters, and other web surfaces.

In plain words
What is it for?
Use it to discover hidden content and virtual hosts, test parameters after finding them, handle false not-found responses, and expand testing when results provide a lead.
Why use it?
It reduces guesswork when selecting wordlists and adjusts testing for different engagement rules, such as stealth or speed limits.

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/encod3d-sec/torch/fuzz
Any agent
npx skills add Encod3d-Sec/TORCH --skill fuzz
Clone the repo
git clone --depth 1 https://github.com/Encod3d-Sec/TORCH

Made for: Claude Code, Codex.

Per session 177 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,463 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 $0.00177 $0.01463
Opus 5 $0.00088 $0.00732
Sonnet 5 $0.00035 $0.00293
Haiku 4.5 $0.00018 $0.00146

Measured 3d ago against content hash 5d448e65d763, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fuzz 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 3d 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/workflow/fuzz/SKILL.md · 55 lines

How it starts

The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.

fuzz - adaptive web fuzzing

0. Profile (do this first)

Read engagement_type from the active targets/<eng>/state.md frontmatter and set the profile:

  • ctf - loud/fast, ignore WAF, recurse deep, exhaust the big list.
  • pt - calibrated rate, obey RoE flags (no_bruteforce/no_dos -> SKIP the brute tiers entirely).
  • bb - stealth: low rate + jitter, watch for the ban BEFORE it lands, request-budget aware. wl-pick.sh emits the profile flags; you apply them.

1. Two axes

  • Surface (widen): content, files, vhost, api, artifacts. Recursive by default.
  • Parameter (deepen): once an endpoint takes input, fuzz hidden params. Triggered by OBSERVING a param-accepting endpoint, never blind.

2. Select (deterministic) - always via wl-pick.sh

# what to run for a surface, given the engagement type and any fingerprint:
bash scripts/wl-pick.sh content "" ctf          # generic content discovery
bash scripts/wl-pick.sh content wordpress bb    # WordPress-aware, BB-stealth
bash scripts/wl-pick.sh vhost "" pt
bash scripts/wl-pick.sh params "" bb

It prints the seclists base, the profile flags line, and the ordered absolute paths (T0 harness -> T3 fingerprint list -> T1 surface lists, size-ordered). NEVER hand-pick a list from memory and NEVER start with directory-list-2.3-medium (220k). The size order is already correct in the output; run top-to-bottom, stop climbing when you have enough signal.

3. Calibrate (native first, backstop with judgment)

  • Default to ffuf -ac/-acc and feroxbuster auto-filtering.
  • If a wildcard/soft-404 fools -ac (everything returns 200 with varying size): fire 2-3 known-bogus random paths first, read status/size/words, then set explicit -fs/-fw on the catch-all baseline, or -mc 200,301,302,401,403 on a clean 404.
  • READ tool output END-TO-END, never a grep. A real hit hides in the noise.

4. Climb tiers on SIGNAL (the adaptive core)

Climb T0 -> T1 -> T2 -> T3 when the current tier is exhausted OR a fingerprint unlocks a better list:

  • T2 cewl when T0/T1 run dry: cewl -d 3 -m 5 --lowercase -w targets/<eng>/custom-words.txt https://TARGET then feed that list back through the same axis. See [[cewl]].
  • T3 app-specific the moment you fingerprint a known product: re-run wl-pick.sh <surface> <product> <type> to jump straight to its shipped list. For a product with no shipped list, Skill(wiki-arsenal) for its known paths, then cewl its docs / probe robots.txt sitemap.xml swagger.json openapi.json.

Read the full file on GitHub · 55 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. 3d ago First seen · 55 lines · 177 tokens per session scan A 5d448e65d763

Subscribe to this mod's changes

fuzz is a skill published in the GitHub repository Encod3d-Sec/TORCH (282 stars, last pushed 5d ago), licensed MIT. It adds 177 tokens to every session and 1,463 once invoked, about $0.0009 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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