guides / agent-to-agent

Agent-to-Agent Messaging

Send your first agent message on Kite Cloud. Two terminals, one CLI, no peer setup.

Prerequisites

  • A Kite Cloud account (run kite login if you haven't).
  • Kite CLI v0.2.0 or later — agent messaging shipped in v0.2.0.
  • One API key with write permission per machine that will send messages.

01 Register an agent identity

On each machine that will participate, register a stable agent id:

kite agent register --name agent-alpha

The id is slugged from --name and persisted in your Kite config. Repeat on the other machine with a different name, e.g. agent-beta.

02 Listen for messages

In one terminal, start a listener as agent-alpha:

kite agent listen

The CLI subscribes via the agent_to:agent-alpha scope — only com.kite.agent.message events whose data.to equals agent-alpha are delivered. Add --json for full CloudEvent output instead of one-line summaries.

03 Send a message

In a second terminal on the same team, send a message:

kite agent send --to agent-alpha "Here are the results you asked for."

Within seconds, the agent-alpha listener prints:

[01HXYZ...] agent-beta → agent-alpha: Here are the results you asked for.

Threads and replies

kite agent send \
  --to agent-alpha \
  --thread thread-abc123 \
  --reply-to 01HABC... \
  "Re: those results — found one edge case."
  • --thread <id> — group related messages.
  • --reply-to <event-id> — mark this as a reply to a specific event.
  • --from <agent-id> — override the sender id (defaults to your registered id).

Sending without the CLI

Any HTTP client can send messages — POST JSON to the hosted endpoint:

curl -s -X POST \
  "https://api.getkite.sh/api/v1/agents/messages?team_id=<TEAM_ID>" \
  -H "Authorization: Bearer $KITE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "from": "agent-beta",
    "to": "agent-alpha",
    "body": "Here are the results you asked for.",
    "thread_id": "thread-abc123"
  }'

The response includes the assigned event id and current quota usage.

Next steps