/slash — FAQ

1. What is Slash?

Token Optimization for Context Engineers. You do your job exactly the same with less tokens. Simple as that.

2. How does it work?

Evaluates every API call before it goes out. Salvages tokens you didn't need to send. Aborts unnecessary calls. Routes to a cheaper model when one fits. Don't go to the corner shop in a Ferrari.

a) Try it — bunx slash-tokens
b) Install it — npm install slash-tokens
c) Import it — import 'slash-tokens/auto'

3. What does it cost?

10% of what you save. That's it. Day one, every day. Never gonna change.

Evaluation returns $50 saving
Slash 10% = $5
You keep $45

$4.20 salvaged
Slash 10% = 42 cents
You keep $3.78

Same task. Savings pile up in your Dashboard.

4. Can I cancel? Am I committed, tied in with a subscription?

No. Unlike the Hotel California, you can leave whenever you like! Simply remove one line of code in your project and you stop saving tokens.

5. How does Slash prevent a call?

The Gate checks every call before it leaves your machine:

Duplicates — same content sent twice within 60 seconds? Stopped.
Empty/trivial — nothing useful to send? Stopped.
Context overflow — tokens exceed the model's window? It would fail anyway. Stopped.

PREVENT isn't about blocking legitimate work. It catches the accidental stuff — the redundant calls, the "oops I hit send twice," the requests that were never going to work anyway.

6. Which is most common — Prevent, Route, or Pass?

ROUTE is the workhorse. Most API calls don't need the flagship model. A simple question on Opus costs 5x more than Haiku — same answer. Slash catches those and reroutes automatically.

PREVENT is surgical — catches obvious mistakes and redundancies.

PASS lets the right call through unchanged. No savings, no charge. Right tool for the job.

7. Is this per project or do I turn it on once?

Turn it on. Forget about it. Every call optimized. One switch. Fire and forget. The Gate runs sub-millisecond on every request — whether it's one prompt or thousands a day. Same optimization, same 90/10 split.

8. Is it safe? What happens to my API keys?

Your API keys pass straight through to the provider. Slash never stores them. It only makes routing decisions. 4.8 KB WASM, zero dependencies, MIT licensed, open source. You can audit the code yourself at GitHub.

9. Who built this?

FAF — the team behind the IANA-registered Foundational AI-Context Format (application/vnd.faf+yaml). Founded by wolfejam. Part of an ecosystem with 52,000+ downloads across 18 packages and 3 registries. Launched April 2026.

10. Which providers and models are supported?

All four frontier providers: Anthropic (Opus, Sonnet, Haiku), OpenAI (GPT-5.4, Mini, Nano), xAI (Grok-4.20, Fast), Google (Gemini Pro, Flash). Works with any model — 10 with built-in pricing. Don't see yours? Open an issue.

/slash FAQ