security-bounty-hunter

security-bounty-hunter is a skill for Claude Code, Codex from jxoesneon/Ciel. It costs 22 tokens per session (496 once invoked), scanned A, original, Apache-2.0.

An offensive security workflow for finding remotely reachable vulnerabilities that attackers could exploit through user-controlled inputs.

In plain words
What is it for?
Use it to investigate issues such as request forgery, authentication bypasses, code execution, SQL injection, and path traversal, including safe proofs of concept.
Why use it?
It focuses security work on verified attack paths and avoids treating low-impact findings as confirmed vulnerabilities.

Skill for Claude CodeCodex

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

Good fit Use it to investigate issues such as request forgery, authentication bypasses, code execution, SQL injection, and path traversal, including safe proofs of concept.

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Install with agentmods
npx agentmods add skills/jxoesneon/ciel/security-bounty-hunter
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 jxoesneon/Ciel --skill security-bounty-hunter
Clone the repo
git clone --depth 1 https://github.com/jxoesneon/Ciel

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 security-bounty-hunter

README.md
[![agentmods](https://agentmods.dev/badge/skills/jxoesneon/ciel/security-bounty-hunter/github.svg)](https://agentmods.dev/skills/jxoesneon/ciel/security-bounty-hunter)
Your own site
<a href="https://agentmods.dev/skills/jxoesneon/ciel/security-bounty-hunter"><img src="https://agentmods.dev/badge/skills/jxoesneon/ciel/security-bounty-hunter/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 security-bounty-hunter

Your own site · 80×15
<a href="https://agentmods.dev/skills/jxoesneon/ciel/security-bounty-hunter"><img src="https://agentmods.dev/badge/skills/jxoesneon/ciel/security-bounty-hunter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 496 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 $0.00022 $0.00496
Opus 5 $0.00011 $0.00248
Sonnet 5 $0.00004 $0.00099
Haiku 4.5 $0.00002 $0.00050

Measured 9d ago against content hash 3ad5f331b2c0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

security-bounty-hunter 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 9d 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/security-bounty-hunter/SKILL.md · 54 lines

What it actually says

CIEL ADAPTATION: Security Bounty Hunter (Offensive Discovery)

This skill formalizes "Practical Vulnerability Hunting." Unlike a broad security review, it focuses on remotely reachable, user-controlled attack paths that qualify for responsible disclosure.

In-Scope Patterns (The High-Value Sink)

  • SSRF: User-controlled URLs reaching internal networks or cloud metadata.
  • Auth Bypass: Logical flaws in middleware or API guards.
  • RCE: Unsafe deserialization or upload-to-code-execution paths.
  • SQLi: User input reaching a database sink without parameterization.
  • Path Traversal: Arbitrary file read/write via unsanitized paths.

Skip (Low-Signal)

  • Local-only bugs (CLI-only exec).
  • Missing security headers (informative only).
  • Self-XSS.
  • Demo or test-only code.

Discovery Workflow

  1. Entrypoint ID: Find all HTTP handlers, webhooks, and parsers.
  2. Triage: Use semgrep or grep_search to find candidate sinks.
  3. Trace: Read the code path end-to-end to verify user control.
  4. PoC: Construct the smallest safe proof-of-concept (PoC) to verify exploitability.

Anti-Patterns

  • Vibes-Hunting: Claiming a bug exists without a working PoC.
  • Noisy Scans: Reporting 50 "Low" severity lint warnings as "Bounties."
  • Scope Blindness: Hunting on endpoints explicitly excluded in SECURITY.md.
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. 9d ago First seen · 54 lines · 22 tokens per session scan A 3ad5f331b2c0

Subscribe to this mod's changes

security-bounty-hunter is a skill published in the GitHub repository jxoesneon/Ciel (1 stars, last pushed 5d ago), licensed Apache-2.0. It adds 22 tokens to every session and 496 once invoked, about $0.0001 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 2026-09-03.

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