/connectChoose the right backend
Connect a model provider or a local ACP agent. Both become consistent Model Profiles instead of leaking backend details into your work.
TERMINAL-FIRST AGENT RUNTIME
Build with agents.
Keep one local runtime.
Connect model providers and ACP agents, bind specialists, and run every turn inside one guarded, resumable workspace.
curl -fsSL https://caelis.dev/install.sh | sh
Copied
CAELISv0.31.0
type / for commands
>
not configured · ~/workspace
main
The current responsive welcome surface — connect, resume, or start typing.
Local-first state
Apache-2.0
ACP-native
macOS · Linux · Windows
ONE WORKSPACE, THREE MOVES
Connect. Delegate. Review.
Caelis turns a collection of models, local agents, and tools into one intentional terminal workflow.
/subagentBind clear specialist roles
Use Breeze for bounded work, Orbit for implementation, and Zenith for deep or high-risk analysis — each with an explicit profile and reasoning effort.
/reviewKeep execution guarded
Guardian reviews tool access; Reviewer inspects the result. Sandbox boundaries and approval prompts stay part of the same session.
CONTROL WITHOUT LOCK-IN
One profile language across every agent.
Provider models and external ACP agents enter through the same Control layer. Roles stay stable even when the backend changes.
Read the architecture →
Model providers
Local ACP agents
CONTROL
ModelProfile
model + effort + backend
SELF
BREEZE
ORBIT
ZENITH
GUARDIAN
REVIEWER
One guarded, resumable Session
>/
>
/zenith Audit @docs/architecture.md/ commands & skills · @ files · Tab complete
THE TERMINAL IS THE PRODUCT
Fast discovery. Quiet long-running work.
The new TUI keeps command and Skill discovery under /, file references under @, and long tasks in stable semantic states instead of noisy control traces.
- Responsive welcome surface with mouse-first actions
- Adaptive themes, completion overlays, image paste, and clickable sources
- Durable sessions with resume, replay, and approval recovery
ONE RUNTIME, THREE SURFACES
Stay interactive. Script it. Embed it.
TUI
Start with caelis for the full interactive workspace, command discovery, approvals, and session control.
HEADLESS
Use caelis -p for one-shot prompts with text or JSON output in scripts and automation.
ACP STDIO
Run caelis acp and expose the same runtime to compatible editors and external agent clients.
BRING YOUR STACK
Open models. Open tools. Open protocol.
Use subscription sign-in, API providers, local models, ACP agents, MCP servers, Skills, and Plugins without rebuilding your workflow around one vendor.
CODEXGROKOPENAICLAUDEGEMINIDEEPSEEKOLLAMAOPENROUTERMCPACPSKILLSPLUGINS
LOCAL-FIRST BY DEFAULT
Your workspace stays yours.
Sessions, execution history, configuration, and workspace context live on your machine. Native sandbox backends constrain tools; Guardian and explicit approvals handle the edges.
Local session persistence
Native sandbox backends
Approval-aware execution
Open-source runtime
FAQ
The short version.
What is Caelis?
A terminal-first agent runtime with an interactive TUI, a headless CLI, and an ACP stdio server. It owns the local workspace, Session, tool, sandbox, and approval boundaries around your agents.
Does it require an external ACP agent?
No. Caelis includes its own local runtime. ACP is an additional interoperability path for connecting local agents and external clients.
Which agents can I connect?
The guided flow currently includes Codex, Claude Code, OpenCode, CodeFree-O, and Grok, plus custom ACP stdio commands.
Can I use my existing model subscription?
Caelis supports guided browser or device sign-in for eligible ChatGPT Codex and Grok subscriptions, alongside API-key and local provider paths.
Where is my data stored?
Under ~/.caelis by default, with an override available through -store-dir.
START IN YOUR TERMINAL