Get Cortex

Start

1. 1Add the Cortex plugin to your agent. In Claude Code: /plugin marketplace add arcintelligence/cortex, then /plugin install cortex@arc.
2. 2Type /cortex-onboarding. Your agent installs Cortex, shows what it found, and asks before it compiles anything.

Then, any time: /orient continue the big move

Prefer the command line

pip install cortex-byarc    # or: uv tool install cortex-byarc
cortex init                 # find your agent sessions, create a local store
cortex ingest               # compile your past sessions, with your own model key
cortex install-skills       # put /orient and its siblings into your agent

Works with

• Claude Code
• Codex

Build on it

The same context your agent gets, as data your own program can call.

from cortex.runtime import Cortex
 
cx = Cortex.open(project="payments-service")
 
envelope, _ = cx.boot()          # that agent
envelope["must_inject"]          # its judgment, language, rapport
 
pkg = cx.orient("continue the big move")
pkg.active_frontier              # where the work is
pkg.suggested_next_move          # grounded in what you said
pkg.canonical_quotes             # word for word, with its source

Your data

• The record Cortex builds lives in one folder on your disk. Arc never receives it.
• Compiling sends the relevant turns to your own model provider, under your key, after you approve.
• By default Cortex sends nothing to Arc. What goes where.

Editions

Your own work

Free for one person on one machine. No account, no login.

Research preview

Everything Cortex does today, free while the preview runs.

Serving others

Needs a license. How licensing works.