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ARMPIT

Agentic Relay Messaging Protocol Interactive Transport v1.0

ARMPIT is an open, SMTP-inspired protocol for agent-to-agent messaging. Agents send structured messages through relays using globally addressable identities, capability manifests for discovery, and a transport-agnostic envelope that works over HTTP, TCP, WebSocket, AMQP, SQS, or any custom delivery layer.

Table of Contents

  1. Core Concepts
  2. Addressing
  3. The Message Schema
  4. Capability Manifests
  5. Discovery
  6. Sending a Message — HTTP Transport
  7. Sending a Message — TCP Transport
  8. Receiving Messages
  9. Pub/Sub — Topics and Subscriptions
  10. Idempotency and Retries
  11. Federation — Cross-Relay Messaging
  12. Running the Reference Relay
  13. Implementing an Agent
  14. Security
  15. Transport Reference
  16. Message Type Reference
  17. Status Code Reference — TCP
  18. Protocol Files in This Repo

1. Core Concepts

Concept Description
Agent Any autonomous process that can send or receive ARP messages — an AI assistant, a newsletter service, a tool runner, etc.
Relay A server that accepts, queues, and delivers messages between agents. Analogous to an SMTP mail server.
Message A HTML, text or JSON envelope with sender, recipient, payload, and presentation hints.
Manifest A machine-readable JSON document hosted by each agent describing its identity, capabilities, and reachable endpoints.
Topic A named pub/sub channel registered on a relay. Agents subscribe to topics; publishers push to them.

The design is deliberately email-like:

Agent A  ──send──►  Relay A  ──(federate if needed)──►  Relay B  ──deliver──►  Agent B

2. Addressing

Every agent has a globally unique address:

agent_local@relay_domain

Examples:

grahm@relay.m-net
newsletter_agent@news.relay.net
research_tool@tools.example.com
  • agent_local — unique within the relay it is registered on.
  • relay_domain — resolves to the relay host via DNS SRV records.
  • user_id — an opaque handle scoped inside a relay, never exposed globally. It maps a message to a specific user the agent is acting on behalf of.

3. The Message Schema

Every message — regardless of transport — is the same JSON object:

{
  "id":          "msg_01j9z4kq0000000000000000",
  "from_agent":  "newsletter_agent@news.relay.net",
  "to_agent":    "agent@relay.m-net",
  "user_id":     "usr_abc123",
  "type":        "NOTIFICATION",
  "thread_id":   "thread_news_2026_03_27",
  "reply_to":    null,
  "payload": {
    "title": "Today in AI",
    "body":  "Check out the new newsletter.",
    "actions": [
      { "id": "open_link", "label": "Read full edition", "url": "https://example.com/today-in-ai" }
    ]
  },
  "presentation": {
    "channel":      "text+voice",
    "voice_style":  "conversational",
    "summary_hint": "brief"
  },
  "created_at":  "2026-03-27T21:53:00Z",
  "expires_at":  null,
  "status":      "queued"
}

Required fields

Field Type Description
id string Relay-assigned or client-supplied. Used for deduplication.
from_agent AgentAddress Sender (local@domain).
to_agent AgentAddress Recipient (local@domain).
user_id string Opaque user handle scoped to the relay.
type MessageType See §16.
payload object Type-specific body. Schema defined per type.
created_at ISO 8601 Relay timestamp of acceptance.
status enum queued | delivered | failed | expired

Optional fields

Field Description
thread_id Groups a conversation. Carry forward from the first message.
reply_to id of the message being replied to.
presentation Rendering hints (channel, voice_style, summary_hint).
expires_at Relay drops the message undelivered after this time.

4. Capability Manifests

Every agent publishes a manifest at a well-known URL so relays and peers can discover it without prior coordination.

Host at:

https://<your-agent-domain>/.well-known/armpit-manifest.json

Minimal manifest:

{
  "schema_version": "armpit-manifest-1.0",
  "agent_id":       "myagent@relay.example.com",
  "display_name":   "My Agent",
  "description":    "Does useful things.",
  "owner": {
    "name":    "Your Name",
    "contact": "mailto:you@example.com"
  },
  "endpoints": {
    "primary": {
      "transport": "https",
      "address":   "https://armpit/myagent.example.com",
      "auth": {
        "scheme":     "bearer",
        "value_hint": "https://relay.example.com/token"
      },
      "tls": true
    }
  },
  "capabilities": {
    "message_types": {
      "send":    ["TASK_REQUEST", "PING"],
      "receive": ["TASK_RESULT", "PONG", "NOTIFICATION"]
    }
  },
  "security": {
    "allowed_relays": ["relay.example.com"]
  }
}

Full manifest with TCP + E2E encryption:

{
  "schema_version": "armpit-manifest-1.0",
  "agent_id":       "agent@relay.m-net",
  "display_name":   "Agent",
  "description":    "Personal AI Assistant",
  "owner": {
    "name":    "M",
    "contact": "mailto:m@example.com"
  },
  "endpoints": {
    "primary": {
      "transport": "https",
      "address":   "https://armpit/aggent.example.com",
      "auth": { "scheme": "bearer", "value_hint": "https://relay.m-net/token" },
      "tls": true
    },
    "tcp": {
      "transport": "tcp",
      "address":   "agent.example.com:2525",
      "auth": { "scheme": "bearer", "value_hint": "https://relay.m-net/token" },
      "tls": true
    }
  },
  "capabilities": {
    "message_types": {
      "send":    ["SUBSCRIBE", "UNSUBSCRIBE", "RESPONSE", "TASK_REQUEST", "PING"],
      "receive": ["SUBSCRIPTION_CONFIRMED", "NOTIFICATION", "TASK_RESULT", "PONG"]
    },
    "topics": [
      { "id": "ai_newsletter", "direction": "receive", "description": "Daily AI news digest." },
      { "id": "system_alerts",  "direction": "receive", "description": "Device and system alerts." }
    ],
    "presentation_profiles": [
      { "id": "voice_primary", "channels": ["voice", "text+voice"], "voice_styles": ["conversational", "brief"] }
    ]
  },
  "security": {
    "allowed_relays": ["relay.m-net"],
    "encryption": {
      "supports_e2e": true,
      "public_keys": [{ "alg": "ed25519", "key": "<BASE64_PUBLIC_KEY>" }]
    }
  },
  "metadata": {
    "homepage": "https://agent.example.com",
    "tags": ["assistant", "personal", "voice"]
  }
}

Set Cache-Control: max-age=3600 on this endpoint — manifests change rarely and every relay that talks to you will fetch it.

5. Discovery

DNS records

Publish these for your relay domain so other relays can find you:

; How to reach this relay over HTTP and TCP
armpit._http.relay.example.com.  IN SRV  0 5 443  relay.example.com.
armpit._tcp.relay.example.com.   IN SRV  0 5 2525 relay.example.com.

; Where to find a specific agent's manifest
armpit-manifest.myagent.relay.example.com.  IN TXT  "https://myagent.example.com/.well-known/arp-manifest.json"

Resolution flow

When Agent A wants to message newsletter_agent@news.relay.net:

  1. Parse domain: news.relay.net
  2. Query armpit._http.news.relay.net SRV → relay host + port
  3. POST /agents on that relay to confirm newsletter_agent is registered
  4. Optionally fetch armpit-manifest.newsletter_agent.news.relay.net TXT to get the manifest URL, then GET the manifest for capability negotiation
  5. Send the message

For simple cases, senders can skip DNS and pass the relay URL directly.

6. Sending a Message — HTTP Transport

Step 1: Register your agent

curl -X POST https://relay.example.com/armpit/v1/agents \
  -H "Content-Type: application/json" \
  -d '{
    "agent_id":     "myagent@relay.example.com",
    "display_name": "My Agent",
    "manifest_url": "https://myagent.example.com/.well-known/armpit-manifest.json",
    "callback": {
      "transport": "https",
      "address":   "https://myagent.example.com/armpit/inbound",
      "auth":      { "scheme": "bearer" }
    }
  }'

Response:

{
  "agent_id":   "myagent@relay.example.com",
  "token":      "eyJhbGciOiJIUzI1NiJ9...",
  "expires_at": null
}

Save the token. Pass it as Authorization: Bearer <token> on every subsequent request.

Step 2: Send a message

curl -X POST https://relay.example.com/armpit/v1/messages \
  -H "Authorization: Bearer eyJhbGciOiJIUzI1NiJ9..." \
  -H "Content-Type: application/json" \
  -d '{
    "id":         "client-ref-7f3a9b",
    "to_agent":   "agent@relay.m-net",
    "user_id":    "usr_abc123",
    "type":       "NOTIFICATION",
    "payload": {
      "title": "Deploy complete",
      "body":  "Production deployment v2.4.1 succeeded."
    },
    "presentation": { "channel": "text+voice", "summary_hint": "brief" }
  }'

Response (202 Accepted):

{
  "id":        "msg_01j9z4kq0000000000000000",
  "status":    "queued",
  "federated": true
}

If from_agent is omitted on the HTTP API, the relay fills it from the authenticated bearer token. If supplied, it must still match the token subject.

federated: true means agent@relay.m-net is on a different relay and the message was forwarded automatically.

Step 3: Retry safely

Retrying with the same id is safe — the relay deduplicates within 24 hours and returns the same 202 without enqueuing a second copy.

7. Sending a Message — TCP Transport

Connect to the relay on port 2525 (TLS recommended).

# Full session example

S: 220 relay.m-net ARMPIT/1.0 Ready
C: HELO myagent@relay.example.com
S: 250 Hello myagent@relay.example.com
C: AUTH BEARER eyJhbGciOiJIUzI1NiJ9...
S: 235 Auth OK
C: FROM myagent@relay.example.com
S: 250 OK
C: TO grahm@relay.m-net
S: 250 OK
C: USER usr_abc123
S: 250 OK
C: TYPE NOTIFICATION
S: 250 OK
C: ID client-ref-7f3a9b
S: 250 OK
C: DATA
S: 354 Start input; end with <CRLF>.<CRLF>
C: {
C:   "title": "Deploy complete",
C:   "body":  "Production deployment v2.4.1 succeeded."
C: }
C: .
S: 250 Message accepted msg_01j9z4kq0000000000000000
C: QUIT
S: 221 Bye

Rules:

  • Commands and responses are single lines, CRLF-terminated.
  • DATA body is JSON, terminated by a lone . on its own line.
  • If a JSON line starts with ., escape it as .. (dot-stuffing, identical to SMTP).
  • ID is optional but enables deduplication — use it when retrying.
  • After DATA completes, the envelope resets. Send another message in the same session with a new FROM/TO/USER/TYPE/DATA sequence.

Python example (connecting client):

import socket, ssl, json

def send_armpit_message(relay_host, token, from_agent, to_agent, user_id,
                     msg_type, payload, msg_id=None):
    ctx = ssl.create_default_context()
    with socket.create_connection((relay_host, 2525)) as raw:
        with ctx.wrap_socket(raw, server_hostname=relay_host) as conn:
            def recv():
                return conn.recv(4096).decode().strip()
            def send(line):
                conn.sendall((line + "\r\n").encode())

            recv()  # 220 banner
            send(f"HELO {from_agent}");       recv()
            send(f"AUTH BEARER {token}");     recv()
            send(f"FROM {from_agent}");       recv()
            send(f"TO {to_agent}");           recv()
            send(f"USER {user_id}");          recv()
            send(f"TYPE {msg_type}");         recv()
            if msg_id:
                send(f"ID {msg_id}");         recv()
            send("DATA");                     recv()  # 354
            body = json.dumps(payload)
            for line in body.splitlines():
                send(".." + line if line.startswith(".") else line)
            send(".");
            print(recv())  # 250 Message accepted ...
            send("QUIT");  recv()

8. Receiving Messages

Agents receive messages in one of two ways:

Push (webhook / callback)

Register a callback endpoint when you call POST /agents. The relay will POST each new message to that address as it arrives.

Your inbound handler must:

  1. Accept the Message JSON body.
  2. Return 200 OK within a reasonable timeout.
  3. Call POST /messages/{msg_id}/ack after processing (or inline if preferred).

The relay retries delivery on non-2xx responses, so ack is idempotent — safe to call multiple times.

Poll (long-poll)

If no callback is registered, poll your inbox:

# Immediate poll
curl https://relay.example.com/armpit/v1/messages \
  -H "Authorization: Bearer <token>"

# Long-poll — relay holds connection up to 30s waiting for a message
curl "https://relay.example.com/armpit/v1/messages?wait=30&limit=10" \
  -H "Authorization: Bearer <token>"

Response:

{
  "messages": [ { ...Message... }, { ...Message... } ],
  "next_cursor": "cur_xyz"
}

After processing each message, acknowledge it:

curl -X POST https://relay.example.com/armpit/v1/messages/msg_01j9z4kq.../ack \
  -H "Authorization: Bearer <token>"

Unacknowledged messages stay in the queue and reappear on the next poll.

9. Pub/Sub — Topics and Subscriptions

Topics are named channels registered on a relay. A publisher agent sends PUBLISH messages to a topic; all subscribed agents receive a NOTIFICATION.

List available topics

curl https://relay.example.com/arp/v1/topics
{
  "topics": [
    {
      "id":              "ai_newsletter",
      "description":     "Daily AI news digest.",
      "publisher_agent": "newsletter_agent@news.relay.net",
      "tags":            ["news", "ai", "daily"]
    }
  ]
}

Subscribe

curl -X POST https://relay.example.com/armpit/v1/topics/ai_newsletter/subscriptions \
  -H "Authorization: Bearer <token>" \
  -H "Content-Type: application/json" \
  -d '{ "preferences": { "frequency": "daily" } }'
  • Returns 201 Created on first subscription.
  • Returns 200 OK if already subscribed (idempotent).

Unsubscribe

curl -X DELETE https://relay.example.com/armpit/v1/topics/ai_newsletter/subscriptions \
  -H "Authorization: Bearer <token>"

Subscribe via message (any transport)

Alternatively, send a SUBSCRIBE message directly to the publisher agent:

{
  "from_agent": "agent@relay.m-net",
  "to_agent":   "newsletter_agent@news.relay.net",
  "user_id":    "usr_abc123",
  "type":       "SUBSCRIBE",
  "payload": {
    "topic":       "ai_newsletter",
    "preferences": { "frequency": "daily" }
  }
}

The publisher confirms with a SUBSCRIPTION_CONFIRMED message back to you.

10. Idempotency and Retries

ARMPIT is designed for unreliable networks. Every mutating operation is safe to retry.

Operation How to retry safely
POST /messages Include a client-generated id. Same id within 24 h = same result, no double-send.
POST /messages/{id}/ack Returns 204 whether new or already acked.
POST /topics/.../subscriptions Returns 200 if already subscribed.
POST /agents Returns 200 if same parameters, refreshes token.
TCP DATA with ID set Relay responds 250 to duplicate without re-enqueuing.

Recommended client pattern:

import uuid, httpx, time

def send_with_retry(relay, token, message, max_attempts=3):
    message["id"] = message.get("id") or f"client-{uuid.uuid4().hex}"
    for attempt in range(max_attempts):
        try:
            r = httpx.post(
                f"{relay}/armpit/v1/messages",
                json=message,
                headers={"Authorization": f"Bearer {token}"},
                timeout=10,
            )
            r.raise_for_status()
            return r.json()
        except (httpx.TimeoutException, httpx.HTTPStatusError) as e:
            if attempt == max_attempts - 1:
                raise
            time.sleep(2 ** attempt)   # exponential backoff

Generate id once per logical message, before the first attempt. Reuse it on retries. Never generate a new id on retry — that defeats deduplication.

11. Federation — Cross-Relay Messaging

Relays forward messages to peer relays automatically when to_agent is on a different domain.

myagent@relay.example.com  →  relay.example.com  →  relay.m-net  →  agent@relay.m-net

From the sender's perspective this is invisible — send to grahm@relay.m-net from any relay and it routes. SendMessageResponse.federated = true confirms cross-relay delivery was used.

For relay operators: publish SRV records (see §5) and include your relay in RelayInfo.federation.peers. Relays resolve the recipient's domain via DNS to find the peer relay.

12. Running the Reference Relay

armpit.py is a minimal but functional ARP/TCP relay.

Requirements

  • Python 3.11+
  • No external dependencies

Start

python3 armpit.py
# ARP/TCP relay listening on 0.0.0.0:2525  (relay.m-net)

Configuration

Edit the constants at the top of armpit.py:

HOST      = "0.0.0.0"     # bind address
PORT      = 2525           # TCP port
RELAY_ID  = "relay.m-net" # your relay's domain identity
DEDUP_TTL = 86400          # dedup window in seconds (24 h)

What it does

  • Accepts TCP connections, one thread per connection.
  • Implements the full HELO → AUTH → FROM → TO → USER → TYPE → [ID] → DATA → QUIT session flow.
  • In-memory message queue (swap enqueue_message() for Redis, Postgres, SQS, etc.).
  • Token validation stub in validate_token() — replace with real JWT verification.

Swap the queue backend

# armpit.py — replace enqueue_message() for production
import redis

r = redis.Redis()

def enqueue_message(msg: dict) -> None:
    r.lpush(f"armpit:inbox:{msg['to_agent']}", json.dumps(msg))

13. Implementing an Agent

A minimal agent needs four things:

1. A manifest

Host /.well-known/armpit-manifest.json on your domain. Declare what message types you can send and receive. See §4.

2. Registration

On startup, POST /agents to your relay with your agent_id, manifest_url, and optional callback endpoint.

3. A message sender

Build the Message object, generate a client id, call POST /messages (or open a TCP session). Retry with exponential backoff using the same id.

4. A message receiver

Either register a callback endpoint that accepts POST with a Message body, or run a poll loop against GET /messages?wait=30.

Minimal Python agent skeleton

import uuid, time, httpx

RELAY    = "https://relay.example.com/armpit/v1"
AGENT_ID = "myagent@relay.example.com"
TOKEN    = None  # set after registration

def register(manifest_url: str, callback_url: str | None = None) -> str:
    global TOKEN
    body = {
        "agent_id":     AGENT_ID,
        "display_name": "My Agent",
        "manifest_url": manifest_url,
    }
    if callback_url:
        body["callback"] = {"transport": "https", "address": callback_url,
                            "auth": {"scheme": "bearer"}}
    r = httpx.post(f"{RELAY}/agents", json=body)
    r.raise_for_status()
    TOKEN = r.json()["token"]
    return TOKEN

def send_message(to_agent: str, user_id: str, msg_type: str,
                 payload: dict, msg_id: str | None = None) -> dict:
    msg_id = msg_id or f"client-{uuid.uuid4().hex}"
    r = httpx.post(
        f"{RELAY}/messages",
        json={
            "id":         msg_id,
            "from_agent": AGENT_ID,
            "to_agent":   to_agent,
            "user_id":    user_id,
            "type":       msg_type,
            "payload":    payload,
        },
        headers={"Authorization": f"Bearer {TOKEN}"},
    )
    r.raise_for_status()
    return r.json()

def poll_inbox(wait: int = 30) -> list[dict]:
    r = httpx.get(
        f"{RELAY}/messages",
        params={"wait": wait, "limit": 20},
        headers={"Authorization": f"Bearer {TOKEN}"},
        timeout=wait + 5,
    )
    r.raise_for_status()
    return r.json()["messages"]

def ack(msg_id: str) -> None:
    httpx.post(
        f"{RELAY}/messages/{msg_id}/ack",
        headers={"Authorization": f"Bearer {TOKEN}"},
    ).raise_for_status()

def run_poll_loop(handler):
    """handler(msg: dict) -> None"""
    while True:
        for msg in poll_inbox(wait=30):
            try:
                handler(msg)
            finally:
                ack(msg["id"])  # ack is idempotent — safe even if handler raises

# Usage:
# register("https://myagent.example.com/.well-known/armpit-manifest.json")
# run_poll_loop(lambda msg: print(msg["type"], msg["payload"]))

14. Security

Authentication

Every request to the relay requires Authorization: Bearer <token>. The token is issued by the relay at registration (POST /agents). For TCP sessions, it is passed via AUTH BEARER <token>.

Replace validate_token() in armpit.py with real JWT verification:

import jwt  # PyJWT

SECRET = "your-relay-signing-secret"

def validate_token(token: str) -> bool:
    try:
        jwt.decode(token, SECRET, algorithms=["HS256"])
        return True
    except jwt.InvalidTokenError:
        return False

SPF-equivalent: allowed_relays

The manifest field security.allowed_relays lists relay domains authorized to deliver messages on behalf of this agent. Receiving agents and relays SHOULD reject or flag messages arriving from unlisted relays — analogous to SPF in email.

End-to-end encryption

If security.encryption.supports_e2e = true, publish an ed25519 public key in your manifest. Senders encrypt payload before sending; only the recipient can decrypt it. The relay never sees the plaintext payload.

TLS

Always use TLS for HTTP (https://) and TCP (set tls: true in your manifest endpoint). The reference relay supports STARTTLS via the CAPA advertised feature list.

Sender verification

The relay MUST verify that from_agent in the message matches the authenticated agent's registered agent_id. Mismatches return 550 Sender mismatch.

15. Transport Reference

The ARMPIT Message schema is transport-agnostic. Agents advertise which transports they support in their manifest endpoints map. The relay picks the best mutual option.

Transport Address format Default port Notes
https https://host/path 443 Recommended default.
http http://host/path 80 Non-TLS, internal networks only.
tcp host:port 2525 Native ARMPIT line protocol (see armpt_tcp_protocol.md).
websocket wss://host/path 443 Persistent bidirectional channel.
amqp amqps://host/vhost/queue 5671 options.exchange, options.routing_key
smtp mailto:agent@domain 25/587 Wraps ARP message in email body.
sqs Queue URL or ARN — options.region required.
custom Any string — Relay and agent must share out-of-band knowledge.

Selecting a transport:

  1. Sender reads recipient's manifest endpoints.
  2. Sender picks the first entry whose transport it supports.
  3. Auth hint (auth.value_hint) tells the sender where to get credentials.
  4. options carries transport-specific config (AMQP exchange, SQS region, etc.).

16. Message Type Reference

Type Direction Description
SUBSCRIBE sender → publisher Request subscription to a topic.
UNSUBSCRIBE sender → publisher Cancel a subscription.
SUBSCRIPTION_CONFIRMED publisher → sender Subscription acknowledged.
PUBLISH publisher → relay Push a message to all topic subscribers.
NOTIFICATION any → any Deliver a notification or alert.
RESPONSE any → any Reply to a prior message (set reply_to).
TASK_REQUEST any → tool agent Delegate a task.
TASK_RESULT tool agent → any Return task output.
ERROR any → any Signal a protocol or application-level error.
PING any → any Liveness check.
PONG any → any Liveness reply to PING.

Extension types: use reverse-domain notation to avoid collisions:

com.example.SUMMARIZE_REQUEST
io.myapp.CALENDAR_EVENT

Agents declare supported types in their manifest under capabilities.message_types.send and capabilities.message_types.receive. Relays SHOULD pass unknown types through; receiving agents SHOULD ignore types not listed in their manifest.

17. Status Code Reference — TCP

Code Meaning
220 Service ready — server banner
221 Closing connection
235 Authentication successful
250 OK / command accepted / message accepted
354 Start input; end with <CRLF>.<CRLF>
450 Temporary failure — try again
500 Syntax error or unknown command
503 Command out of sequence
530 Authentication required or failed
550 Permanent failure (agent not found, sender mismatch)

18. Protocol Files in This Repo

File Description
OpenAPI.yaml Full HTTP/JSON API spec — schemas, endpoints, examples.
armpit_tcp_protocol.md ARP/TCP line protocol spec — commands, status codes, session flow.
armpit.py Reference ARP/TCP relay implementation (Python 3.11+).
manifest.json Example capability manifest for grahm@relay.m-net.
example_message.json Example NOTIFICATION message.
EndPoints.yaml Human-readable endpoint quick-reference.

Quick-start checklist

  • Host /.well-known/armpit-manifest.json with your agent_id, endpoints, and capability types
  • Publish DNS SRV records for your relay domain
  • POST /agents to register on your relay — save the token
  • Choose a receive strategy: webhook callback or poll loop
  • Generate a client id per message; reuse it on retries
  • Acknowledge every received message with POST /messages/{id}/ack
  • Declare allowed_relays in your manifest to prevent spoofing
  • Use TLS on all transports in production

armpit

About

Agent 2 Agent messaging protocal Agentic Relay Messaging Protocol Interactive Transport. Provides a means for minimal human interaction but maintains human in the loop communication between personal ai agents, services, functions, mcp servers, etc.

marenacio.com/armpit

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