chain

chain is a command for coding agents from x-cookie/cbughunter-k2. It costs 0 tokens per session (1,403 once invoked), scanned B, original, no licence file.

A security-testing command that looks for ways to combine separate bugs into one larger attack path. For example, it can connect an access-control flaw to account takeover.

In plain words
What is it for?
Use it during security research to explore exploit chains such as IDOR to account takeover or SSRF to cloud metadata access.
Why use it?
Individual bugs can be rated as low impact even when attackers can combine them for greater damage or a larger security reward.

Command

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 commands/x-cookie/cbughunter-k2/chain
Clone the repo
git clone --depth 1 https://github.com/x-cookie/cbughunter-k2

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 chain

README.md
[![agentmods](https://agentmods.dev/badge/commands/x-cookie/cbughunter-k2/chain.svg)](https://agentmods.dev/commands/x-cookie/cbughunter-k2/chain)
Your own site
<a href="https://agentmods.dev/commands/x-cookie/cbughunter-k2/chain"><img src="https://agentmods.dev/badge/commands/x-cookie/cbughunter-k2/chain.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,403 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 $0.00000 $0.01403
Opus 5 $0.00000 $0.00701
Sonnet 5 $0.00000 $0.00281
Haiku 4.5 $0.00000 $0.00140

Measured 5d ago against content hash 6c2a202c2ca5, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

chain 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 5d 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.

Cloud metadata endpointmediumServer-side request forgery

One request to 169.254.169.254 can return temporary IAM credentials.

2. Try internal IPs: 169.254.169.254, 10.x.x.x, 172.16.x.x

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

commands/chain.md · 136 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 5d ago First seen · 136 lines · 0 tokens per session scan B 6c2a202c2ca5

Subscribe to this mod's changes

chain is a command published in the GitHub repository x-cookie/cbughunter-k2 (5 stars, last pushed 3mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 1,403 tokens. A static security scan graded it B with 1 finding (cloud metadata endpoint). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.