Metabigor is an OSINT command-line tool that maps a target’s internet infrastructure using free sources, without requiring API keys. Security researchers, penetration testers, and bug bounty hunters use it to discover network ranges, domains, ports, certificates, exposed services, and related infrastructure.
Borrowing it
Nothing to install: this file belongs to j3ssie/metabigor. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/j3ssie/metabigor/main/CLAUDE.mdgit clone --depth 1 https://github.com/j3ssie/metabigorWrote 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.
[](https://agentmods.dev/instructions/j3ssie/metabigor/claude-md)<a href="https://agentmods.dev/instructions/j3ssie/metabigor/claude-md"><img src="https://agentmods.dev/badge/instructions/j3ssie/metabigor/claude-md.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.03757 | $0.03757 |
| Opus 5 | $0.01878 | $0.01878 |
| Sonnet 5 | $0.00751 | $0.00751 |
| Haiku 4.5 | $0.00376 | $0.00376 |
Grade A, and why
metabigor CLAUDE.md 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 321 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Metabigor - CLAUDE.md
Project: Metabigor - OSINT intelligence tool without API key hassle Version: v2.2.0 Language: Go 1.24.0 Author: @j3ssie License: MIT
Project Overview
Metabigor is a command-line OSINT (Open Source Intelligence) tool designed to perform network reconnaissance and intelligence gathering without requiring API keys. It's part of the Osmedeus Engine ecosystem and focuses on seven core capabilities:
- Network Discovery (
net) - Find IP ranges (CIDRs) from ASN, organization, domain, or IP - Certificate Transparency (
cert) - Discover subdomains via crt.sh certificate logs - IP Enrichment (
ip) - Get port/service/vulnerability data via Shodan InternetDB (free) - GitHub Code Search (
github) - Find secrets and credentials in public repos via grep.app - IP Clustering (
cluster) - Group IPs by ASN for infrastructure mapping - Related Domains (
related) - Discover related domains via cert logs, WHOIS, analytics - CDN/WAF Detection (
cdn) - Identify if IPs are behind CDN or WAF providers - URL Collection (
url) - Collect known URLs from web archives and indexes, including endpoints mined out of GhostArchive WARC files
It also ships a maintenance command, Skills (skills), that lists, prints, and installs the
embedded agentskills.io skill bundle teaching a coding agent how to drive
the CLI.
Architecture
Directory Structure
metabigor/
├── cmd/metabigor/ # Main application entry point
├── internal/ # Internal packages (not importable by external projects)
│ ├── asndb/ # ASN database management (local CSV lookups)
│ ├── cert/ # Certificate transparency search (crt.sh)
│ ├── cli/ # Cobra CLI commands and subcommands
│ ├── core/ # Core constants and configuration
│ ├── countrydb/ # Country database management
│ ├── gitsearch/ # GitHub code search via grep.app
│ ├── httpclient/ # HTTP client utilities (retryable, Chrome-based)
│ ├── ipinfo/ # IP enrichment (Shodan InternetDB) and clustering
│ ├── netdiscovery/ # Network discovery (static DB + dynamic sources)
│ ├── options/ # Global CLI options and configuration
│ ├── output/ # Output formatting (JSON, CSV, flat) and logging
│ ├── related/ # Related domain discovery (crt, WHOIS, analytics)
│ ├── runner/ # Core execution runner and input processing
│ ├── skill/ # SKILL.md frontmatter parsing for the skills command
│ └── urlsource/ # URL collection sources (Wayback, Common Crawl, ...)
├── public/ # Embedded assets: ASN/country databases + skills/ bundles
│ └── skills/ # Coding-agent skill bundles (SKILL.md + references/)
├── build/ # Release tooling (not compiled into the binary)
│ ├── npm/ # @j3ssie/metabigor packaging: build.mjs + launcher/
│ └── scripts/ # bump-version.sh, github-release.sh
└── test/ # End-to-end test scripts
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.
- 6d ago First seen · 321 lines · 3,757 tokens per session scan A 7cf29a160ccc
metabigor CLAUDE.md is an instructions file published in the GitHub repository j3ssie/metabigor (1,803 stars, last pushed 28d ago), licensed MIT. It adds 3,757 tokens to every session, about $0.0188 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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