Your AI doesn't know
how you work
Sigil gives AI real context about your project — and enforces your rules mechanically. Upload, configure, enforce. That's it.
Free to use. No credit card. Works with Claude, Cursor, Copilot, and more.
Three steps, three minutes
No installation. No terminal. If you can drag a file, you can use Sigil.
Upload your project
Drag in a folder or ZIP. Sigil reads your files, structure, and patterns — no terminal needed.
Set your rules
Tell AI how to behave: tone, style, boundaries. Rules are enforced — AI can't violate them, not just reminded.
Download & drop in
Get a config file for Claude, Cursor, Copilot — any AI tool. Put it in your project folder. Done.
Built for how you work
Preset rule packs for different ways of working. Pick one, customize it, or start from scratch.
Writers
"Maintain my voice. Cite every source. Cut the fluff."
Researchers
"Distinguish correlation from causation. Flag old sources."
Business
"Lead with the conclusion. Quantify everything."
Students
"Don't write my assignment — guide me to the answer."
Developers
"No any types. Write tests first. Never hardcode secrets."
Creatives
"Generate 3 options before converging. Challenge assumptions."
The difference context makes
- ✕ Generic, one-size-fits-all responses
- ✕ Doesn't know your project structure
- ✕ Ignores your standards — no enforcement
- ✕ Same instructions repeated every session
- ✓ Understands your files, patterns, architecture
- ✓ Enforces your rules — violations blocked, not just discouraged
- ✓ Matches your voice and standards
- ✓ Set once — persists across sessions
Give your AI the context it's missing
Writers, researchers, developers, students — everyone gets better AI when it understands how they work.
Get started for freeDeveloper? Install the CLI →