h1-brain

An MCP server that connects your AI assistant to HackerOne. It pulls your bug bounty history, program scopes, and report details into a local SQLite database, then exposes tools that let any MCP-compatible client (Claude Desktop, Claude Code, etc.) search, analyze, and build on your past work.

It also ships with a pre-built database of 3,600+ publicly disclosed bounty-awarded reports from the HackerOne community — full vulnerability write-ups, weakness types, and bounty amounts. The AI uses both your personal data and public knowledge to generate attack briefings.

The primary tool, hack(handle), generates a full hacking session briefing in a single call: fresh scope from the API, your past findings, public disclosures for that program, weakness patterns, untouched assets, and suggested attack vectors — all formatted as actionable instructions that put the AI in offensive mode.

How It Works

For a full walkthrough, check out the three-part Bug Bounty Goldfish series:

1. Teaching Claude Everything You've Hacked — Why I built h1-brain and how to set it up
2. What h1-brain Actually Does — Every tool explained, from search to the hack() briefing
3. Running h1-brain Against a Real Target — A start-to-finish walkthrough on an actual program

graph LR
    A["Claude Desktop / Code"] -->|MCP Protocol| B["h1-brain server"]
    B -->|API calls| C["HackerOne API"]
    B -->|reads / writes| D["Your Reports DB"]
    B -->|reads| E["Public Reports DB"]
    C -->|reports, programs, scopes| B
    D -->|your history + analysis| A
    E -->|community knowledge| A
    style A fill:#ff5c5c,stroke:#ff5c5c,color:#fff
    style B fill:#1a1d27,stroke:#ff5c5c,color:#fff
    style C fill:#1a1d27,stroke:#555,color:#fff
    style D fill:#1a1d27,stroke:#555,color:#fff
    style E fill:#1a1d27,stroke:#555,color:#fff

flowchart TD
    A["hack(handle)"] --> B["Fetch fresh scope from HackerOne API"]
    B --> C["Pull your reports on this program from SQLite"]
    C --> D["Analyze weakness patterns across ALL programs"]
    D --> E["Identify untouched bounty-eligible assets"]
    E --> F["Cross-reference public disclosed reports for this program"]
    F --> G["Generate attack briefing with agent instructions"]
    style A fill:#ff5c5c,stroke:#ff5c5c,color:#fff
    style G fill:#ff5c5c,stroke:#ff5c5c,color:#fff
    style B fill:#1a1d27,stroke:#555,color:#fff
    style C fill:#1a1d27,stroke:#555,color:#fff
    style D fill:#1a1d27,stroke:#555,color:#fff
    style E fill:#1a1d27,stroke:#555,color:#fff
    style F fill:#1a1d27,stroke:#555,color:#fff

Requirements

• Python 3.10+
• A HackerOne API token (generate one here)

Setup

git clone https://github.com/PatrikFehrenbach/h1-brain.git
cd h1-brain
python -m venv venv
source venv/bin/activate
pip install -r requirements.txt

The public disclosed reports database (disclosed_reports.db) is included in the repo — no extra setup needed.

Connecting to Claude

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json: