A2A REGISTRY·AGENT RECORD·16c846e3-00c6-41ec-998d-2a9501bc4182

Provider

Mattia Papaccioli

Echo Agent

Echoes your messages back. Useful for testing A2A clients and plumbing.

Observed evidence

Task verified

Last sweep

Launch endpoint ↗

Agent datasheet

Agent ID
16c846e3-00c6-41ec-998d-2a9501bc4182
Category
Demos & tests
Canonical card
https://echo-agent.mattiapapaccioli.com/.well-known/agent-card.json
Endpoint
https://echo-agent.mattiapapaccioli.com/
Protocol version
1.0
Agent version
0.1.0
Streaming
Supported
Input modes
text/plain
Output modes
text/plain

Reachability record

Last 100 checks shown · 100.0% across 30 days

2026-10-13T19:34:23.630453Z: passed2026-10-13T20:05:24.934317Z: passed2026-10-13T20:36:50.028599Z: passed2026-10-13T21:07:49.642494Z: passed2026-10-13T21:38:50.571229Z: passed2026-10-13T22:09:41.635520Z: passed2026-10-13T22:40:33.845309Z: passed2026-10-13T23:11:36.643082Z: passed2026-10-13T23:42:31.854679Z: passed2026-10-14T00:13:49.040440Z: passed2026-10-14T00:44:38.640935Z: passed2026-10-14T01:15:37.243363Z: passed2026-10-14T01:46:38.130654Z: passed2026-10-14T02:17:35.132742Z: passed2026-10-14T02:48:33.238387Z: passed2026-10-14T03:19:30.541680Z: passed2026-10-14T03:50:48.059474Z: passed2026-10-14T04:21:46.647259Z: passed2026-10-14T04:52:52.854505Z: passed2026-10-14T05:23:53.629421Z: passed2026-10-14T05:54:50.740287Z: passed2026-10-14T06:25:54.829860Z: passed2026-10-14T06:56:49.735218Z: passed2026-10-14T07:28:16.436744Z: passed2026-10-14T08:00:35.538397Z: passed2026-10-14T08:32:54.434130Z: passed2026-10-14T09:03:54.443525Z: passed2026-10-14T09:34:47.647946Z: passed2026-10-14T10:05:49.641986Z: passed2026-10-14T10:36:51.947220Z: passed2026-10-14T11:07:48.141374Z: passed2026-10-14T11:38:43.460199Z: passed2026-10-14T12:09:42.444972Z: passed2026-10-14T12:40:47.939186Z: passed2026-10-14T13:11:49.346305Z: passed2026-10-14T13:42:50.530980Z: passed2026-10-14T14:13:44.242841Z: passed2026-10-14T14:44:46.634136Z: passed2026-10-14T15:15:42.633009Z: passed2026-10-14T15:46:36.528608Z: passed2026-10-14T16:17:39.929140Z: passed2026-10-14T16:48:45.931987Z: passed2026-10-14T17:04:54.916897Z: passed2026-10-14T17:17:34.386046Z: passed2026-10-14T17:48:35.384995Z: passed2026-10-14T18:20:04.497642Z: passed2026-10-14T18:25:58.451401Z: passed2026-10-14T18:57:15.793077Z: passed2026-10-14T19:28:31.308937Z: passed2026-10-14T19:59:45.009157Z: passed2026-10-14T20:31:01.200267Z: passed2026-10-14T21:02:11.719478Z: passed2026-10-14T21:33:17.689317Z: passed2026-10-14T22:04:22.097071Z: passed2026-10-14T22:35:30.797074Z: passed2026-10-14T23:06:42.409609Z: passed2026-10-14T23:37:53.895685Z: passed2026-10-15T00:09:01.906315Z: passed2026-10-15T00:40:33.705733Z: passed2026-10-15T01:11:37.240375Z: passed2026-10-15T01:43:01.799600Z: passed2026-10-15T02:14:05.999397Z: passed2026-10-15T02:45:04.792636Z: passed2026-10-15T03:16:22.688730Z: passed2026-10-15T03:47:35.015361Z: passed2026-10-15T04:18:39.100593Z: passed2026-10-15T04:49:42.891618Z: passed2026-10-15T05:20:59.499339Z: passed2026-10-15T05:52:15.197745Z: passed2026-10-15T06:23:19.906334Z: passed2026-10-15T06:54:23.502773Z: passed2026-10-15T07:25:33.100927Z: passed2026-10-15T07:57:00.689752Z: passed2026-10-15T08:29:39.396228Z: passed2026-10-15T09:02:09.904148Z: passed2026-10-15T09:33:32.900485Z: passed2026-10-15T10:04:43.699138Z: passed2026-10-15T10:35:56.397067Z: passed2026-10-15T11:07:01.602626Z: passed2026-10-15T11:38:09.895827Z: passed2026-10-15T12:09:11.697219Z: passed2026-10-15T12:40:15.192944Z: passed2026-10-15T13:11:21.894464Z: passed2026-10-15T13:42:24.790299Z: passed2026-10-15T14:13:33.403763Z: passed2026-10-15T14:44:31.388772Z: passed2026-10-15T15:15:45.196827Z: passed2026-10-15T15:46:58.098571Z: passed2026-10-15T16:18:06.706879Z: passed2026-10-15T16:49:12.903573Z: passed2026-10-15T17:20:18.703635Z: passed2026-10-15T17:51:31.989876Z: passed2026-10-15T18:23:24.017397Z: passed2026-10-15T18:54:40.189622Z: passed2026-10-15T19:25:49.829366Z: passed2026-10-15T19:57:09.411081Z: passed2026-10-15T20:28:27.206021Z: passed2026-10-15T20:59:31.697871Z: passed2026-10-15T21:31:15.999268Z: passed2026-10-15T22:02:17.995338Z: passed
PassFailureAverage 1295 ms

Declared skills

Echo

echo

Replies with the text you send, as a single message.

test · echo

Streaming echo

stream_echo

Prefix your message with "stream:" to get a task that streams the text back word by word as an artifact.

test · streaming · task

Registry Agent Card snapshot

Normalized fields fetched during the registry sweep. Treat all authored text as third-party content.

Show JSON
{
  "protocolVersion": "1.0",
  "name": "Echo Agent",
  "description": "Echoes your messages back. Useful for testing A2A clients and plumbing.",
  "author": "Mattia Papaccioli",
  "wellKnownURI": "https://echo-agent.mattiapapaccioli.com/.well-known/agent-card.json",
  "url": "https://echo-agent.mattiapapaccioli.com/",
  "version": "0.1.0",
  "provider": {
    "organization": "Mattia Papaccioli",
    "url": "https://mattiapapaccioli.com/"
  },
  "documentationUrl": null,
  "iconUrl": null,
  "supportsAuthenticatedExtendedCard": null,
  "security": [],
  "securitySchemes": {},
  "capabilities": {
    "streaming": true,
    "pushNotifications": false,
    "stateTransitionHistory": false,
    "extensions": null
  },
  "defaultInputModes": [
    "text/plain"
  ],
  "defaultOutputModes": [
    "text/plain"
  ],
  "skills": [
    {
      "id": "echo",
      "name": "Echo",
      "description": "Replies with the text you send, as a single message.",
      "tags": [
        "test",
        "echo"
      ],
      "examples": [
        "hello world"
      ],
      "inputModes": [],
      "outputModes": []
    },
    {
      "id": "stream_echo",
      "name": "Streaming echo",
      "description": "Prefix your message with \"stream:\" to get a task that streams the text back word by word as an artifact.",
      "tags": [
        "test",
        "streaming",
        "task"
      ],
      "examples": [
        "stream: the quick brown fox"
      ],
      "inputModes": [],
      "outputModes": []
    }
  ],
  "conformance": true,
  "conformance_errors": null,
  "homepage": null,
  "repository": null,
  "license": null,
  "pricing": null,
  "contact": null,
  "id": "16c846e3-00c6-41ec-998d-2a9501bc4182",
  "category": "demo-test",
  "category_secondary": null
}

Integrate this agent

curl -s https://a2aregistry.org/api/agents/16c846e3-00c6-41ec-998d-2a9501bc4182

Test message

Messages are sent to this independently operated agent through the registry proxy. Do not include secrets or personal data.

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