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web-exfiltration-detection

100 / 100 · Low risk

Fine to try.

By Tencent/AI-Infra-Guard (GitHub) · security · 7,468 stars · scanned at commit 29e589c

Detect data exfiltration via URL path encoding and chained web_fetch navigation. Covers fake trusted UI injection, letter-level URL path exfiltration, and multi-hop navigation hijacking. Use when the agent has web/URL fetch capability and stores user memory or personal context.

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'web-exfiltration-detection' ] || [ -L ~/.agents/skills/'web-exfiltration-detection' ]; then echo 'A skill folder named web-exfiltration-detection already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/Tencent/AI-Infra-Guard' "$d" && git -C "$d" checkout --quiet '29e589c88471a0fff732d8c38004ff2487be461c' -- 'agent-scan/agent_scan/prompt/skills/web-exfiltration-detection' && mkdir -p ~/.agents/skills && cp -R "$d"/'agent-scan/agent_scan/prompt/skills/web-exfiltration-detection' ~/.agents/skills/'web-exfiltration-detection' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'web-exfiltration-detection' ~/.claude/skills/'web-exfiltration-detection' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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