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content-type-mime-diff

100 / 100 · Low risk

Fine to try.

By dreadnode/capabilities (GitHub) · security · 22 stars · scanned at commit 3ceeb34

MIME Content-Type parser differentials between browsers and server-side libraries for XSS. Browsers treat Content-Type as list-based (last value wins), while server-side parsers treat it as singleton (first value wins). Use when application validates Content-Type server-side but reflects it verbatim in response headers.

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/'content-type-mime-diff' ] || [ -L ~/.agents/skills/'content-type-mime-diff' ]; then echo 'A skill folder named content-type-mime-diff already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/dreadnode/capabilities' "$d" && git -C "$d" checkout --quiet '3ceeb34c0c33dc36738cf0d4ec86e38b53d98216' -- 'capabilities/web-security/skills/content-type-mime-diff' && mkdir -p ~/.agents/skills && cp -R "$d"/'capabilities/web-security/skills/content-type-mime-diff' ~/.agents/skills/'content-type-mime-diff' && 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/'content-type-mime-diff' ~/.claude/skills/'content-type-mime-diff' (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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