the-great-gpt-firewall: A curated list of websites that restrict access to AI Agents, AI crawlers and GPTs

by samber · Agent Tool · ★ 101

Last updated: · Indexed by AgentSkillsHub · Auto-synced every 8h

Security audit verdict: SAFE · quality 56/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours.

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

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Quick Facts

Stars101
Forks7
LanguagePython
CategoryAgent Tool
LicenseMIT
Quality Score56/100
Open Issues2
Last Updated2026-11-01
Created2024-02-13
Platformsbrowser, python
Est. Tokens~17k

About the-great-gpt-firewall

The Great GPT Firewall 📛 This collection is a curated list of websites that employ the file to restrict access to AI Agents, AI crawlers and GPTs. It will be updated monthly. User agents & robots.txt The file allows website owners to control and limit the access of these user agents to certain areas of their website by specifying rules and directives.

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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