Meet Casper, the coding agent that plans first

It reads your repo, writes a plan you can change, and edits files only after you approve each diff.

Get started free See plans

you add rate limiting to the public API

plan reading 14 files in 3 folders

[x] throttle middleware

[x] limits read from config

[ ] tests

edit routes/api.php

- Route::middleware('api')

+ Route::middleware(['api', 'throttle:60,1'])

ask y approve n reject e edit first

Illustrative session.

Every change goes through you.

The controls that make it safe to hand an agent a real codebase.

plan: Reads the codebase first and writes a step-by-step plan. You edit the plan, then it runs.
approve: Every file change arrives as a diff. Nothing is written until you say yes. Auto mode is opt-in.
explore: A search helper reads many files at once, so the main agent keeps its context for the actual work.
skills: Install skills from a GitHub repo or a zip, and switch them on per project.
memory: Reads the notes in your project's .agent/memory folder, so you stop repeating yourself.
limit: Stops at your plan's monthly token budget. No surprise bill.

$ sign up
# free plan, no card

$ code
# run "Casper: Sign In" in VS Code

$ approve
# your browser opens, one click, and you are back in the editor

Every account starts on the free plan. Upgrades are approved by an admin, so there is never a surprise charge.

$ plans --monthly

What counts as a token?: Input plus output tokens of every model call the agent makes, counted per calendar month. The meter on your subscription page and in VS Code shows the running total.
What happens at my limit?: The agent declines new requests with a clear message until the month resets or your plan changes. A run already in progress is not cut off halfway.
How do upgrades work?: Request a plan from your subscription page. An admin reviews it and switches your plan. There is no card form: billing is handled by the admin.
Will it change files without asking?: No. By default every edit is shown as a diff and waits for your approval. You can turn on auto mode per chat if you prefer.
Which models can I use?: Each plan lists the models it can run. Plans marked all models include every model the admin has enabled, including ones added later.
Can I use more than one machine?: Yes. Signing in from VS Code makes one token per device. Revoke any of them on the API tokens page.

$ agent init

Get started free