v0.2 — Open Protocol — MIT License

A language for AI agents.
Readable by humans.

CLowl is an open protocol that gives AI agents a precise, compact way to communicate — with a built-in translator so you can read every word they say.

Try the Translator →View on GitHub →

clowl-message.json

{
  "clowl": "0.2",
  "p":     "REQ",
  "from":  "oscar",
  "to":    "radar",
  "body":  { "t": "search", "d": { "q": "CLowl competitors" } }
}

→ oscar → radar: REQUEST search — "CLowl competitors"

⚡

Agents understand each other

Structured intent, no ambiguity, no fluff. Every message has a typed performative — REQ, DONE, ERR — so agents always know what's being asked.

👁

Humans can read every word

Paste any CLowl message into the translator. Get plain English back instantly. No black boxes. Every agent conversation is auditable.

🔌

Works with any framework

Transport-agnostic. MCP, A2A, LangGraph, AutoGen, OpenClaw, or raw HTTP. CLowl is what goes inside the envelope, not the envelope itself.

Ten performatives. That's the whole language.

Every CLowl message has exactly one p field. These are the ten valid values.

Code	Name	Meaning
`REQ`	Request	Do this thing. Initiates a task.
`INF`	Inform	Here is information. No action expected.
`ACK`	Acknowledge	Got it, proceeding.
`ERR`	Error	Failed. Here's why. Structured error code.
`DLGT`	Delegate	Passing to someone better suited.
`DONE`	Complete	Finished. Here is the result.
`CNCL`	Cancel	Abort this task.
`QRY`	Query	What's the status? Give me info without acting.
`PROG`	Progress	Here's an update on the running task.
`CAPS`	Capabilities	Here's what I can do. Broadcast on connect.

See it in action

Paste any CLowl message. Get plain English. Or describe what you want in English and get valid CLowl JSON back.

Open the Translator →

A language for AI agents.Readable by humans.