A2A REGISTRY·AGENT RECORD·da3b9b9f-7c8f-497b-8d9d-38d9047f2de4

Provider

A2A Registry Team

Hello World Agent

A simple A2A agent that responds with 'Hello World' to any request

Observed evidence

Reachable

Last sweep

Launch endpoint ↗

Agent datasheet

Agent ID
da3b9b9f-7c8f-497b-8d9d-38d9047f2de4
Canonical card
https://hello.a2aregistry.org/.well-known/agent-card.json
Endpoint
https://hello.a2aregistry.org/
Protocol version
0.3
Agent version
1.0.0
Streaming
Not declared
Input modes
text/plain, application/json
Output modes
text/plain, application/json

Reachability record

Last 100 checks shown · 99.1% across 30 days

2026-09-12T20:44:37.268840Z: passed2026-09-12T21:15:20.369073Z: passed2026-09-12T21:46:01.475319Z: passed2026-09-12T22:16:42.467324Z: passed2026-09-12T22:47:18.173516Z: passed2026-09-12T23:18:18.075853Z: passed2026-09-12T23:51:10.473054Z: passed2026-09-13T00:21:54.174247Z: passed2026-09-13T00:52:32.486815Z: passed2026-09-13T01:23:12.868438Z: passed2026-09-13T01:53:54.771785Z: passed2026-09-13T02:24:31.870641Z: passed2026-09-13T02:55:13.572044Z: passed2026-09-13T03:25:50.584226Z: passed2026-09-13T03:56:33.272914Z: passed2026-09-13T04:27:15.980147Z: passed2026-09-13T04:57:52.676589Z: passed2026-09-13T05:28:40.971360Z: passed2026-09-13T05:59:17.679662Z: passed2026-09-13T06:29:55.767250Z: passed2026-09-13T07:00:36.366938Z: passed2026-09-13T07:31:15.776179Z: passed2026-09-13T08:01:51.677096Z: passed2026-09-13T08:32:41.495206Z: passed2026-09-13T09:03:18.577924Z: passed2026-09-13T09:33:55.468659Z: passed2026-09-13T10:04:32.073679Z: passed2026-09-13T10:36:15.266624Z: passed2026-09-13T11:06:51.369576Z: passed2026-09-13T11:37:35.168275Z: passed2026-09-13T12:08:11.671235Z: passed2026-09-13T12:38:49.874283Z: passed2026-09-13T13:09:31.474147Z: passed2026-09-13T13:40:18.566637Z: passed2026-09-13T14:11:01.069548Z: passed2026-09-13T14:41:41.311623Z: passed2026-09-13T15:12:27.473257Z: passed2026-09-13T15:43:16.290837Z: passed2026-09-13T16:13:55.275142Z: passed2026-09-13T16:44:36.388689Z: passed2026-09-13T17:15:19.571997Z: passed2026-09-13T17:45:56.877189Z: passed2026-09-13T18:16:35.070023Z: passed2026-09-13T18:47:24.976063Z: passed2026-09-13T19:18:02.667711Z: passed2026-09-13T19:48:41.667269Z: passed2026-09-13T20:19:22.485005Z: passed2026-09-13T20:50:14.881267Z: passed2026-09-13T21:20:54.986888Z: passed2026-09-13T21:51:41.766097Z: passed2026-09-13T22:22:21.168057Z: passed2026-09-13T22:53:01.965799Z: passed2026-09-13T23:24:03.203321Z: passed2026-09-13T23:57:09.071814Z: passed2026-09-14T00:27:56.588337Z: passed2026-09-14T00:58:48.267972Z: passed2026-09-14T01:29:37.267343Z: passed2026-09-14T02:00:21.696712Z: passed2026-09-14T02:31:01.583003Z: passed2026-09-14T03:01:56.172594Z: passed2026-09-14T03:32:34.465931Z: passed2026-09-14T04:03:16.970567Z: passed2026-09-14T04:33:54.674410Z: passed2026-09-14T05:04:31.772921Z: passed2026-09-14T05:35:15.772478Z: passed2026-09-14T06:06:04.177077Z: passed2026-09-14T06:36:43.372251Z: passed2026-09-14T07:07:23.074635Z: passed2026-09-14T07:38:02.070894Z: passed2026-09-14T08:08:42.073951Z: passed2026-09-14T08:39:21.974226Z: passed2026-09-14T09:10:12.870516Z: passed2026-09-14T09:40:51.266367Z: passed2026-09-14T10:11:32.574831Z: passed2026-09-14T10:43:09.870690Z: passed2026-09-14T11:13:59.979794Z: passed2026-09-14T11:42:31.235336Z: passed2026-09-14T12:13:13.141618Z: passed2026-09-14T12:39:38.568772Z: passed2026-09-14T13:10:28.372940Z: passed2026-09-14T13:41:17.472349Z: passed2026-09-14T14:12:02.070270Z: failed2026-09-14T14:43:01.280952Z: passed2026-09-14T15:13:47.776082Z: passed2026-09-14T15:44:36.768090Z: passed2026-09-14T16:15:36.668496Z: passed2026-09-14T16:46:20.573747Z: passed2026-09-14T17:17:15.358462Z: passed2026-09-14T17:47:59.383857Z: passed2026-09-14T18:18:50.180099Z: passed2026-09-14T18:49:49.159705Z: passed2026-09-14T19:20:40.569262Z: passed2026-09-14T19:51:32.290662Z: passed2026-09-14T20:22:26.480612Z: failed2026-09-14T20:53:17.066010Z: passed2026-09-14T21:24:03.668537Z: passed2026-09-14T21:54:49.583878Z: passed2026-09-14T22:25:36.572030Z: passed2026-09-14T22:56:21.881151Z: passed2026-09-14T23:27:34.370796Z: passed
PassFailureAverage 911 ms

Declared skills

Say Hello

hello

Responds with a friendly 'Hello World' message

greeting · hello · simple

Registry Agent Card snapshot

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

Show JSON
{
  "protocolVersion": "0.3",
  "name": "Hello World Agent",
  "description": "A simple A2A agent that responds with 'Hello World' to any request",
  "author": "A2A Registry Team",
  "wellKnownURI": "https://hello.a2aregistry.org/.well-known/agent-card.json",
  "url": "https://hello.a2aregistry.org/",
  "version": "1.0.0",
  "provider": {
    "organization": "A2A Registry Team",
    "url": "https://github.com/prassanna-ravishankar/a2a-registry"
  },
  "documentationUrl": null,
  "iconUrl": null,
  "supportsAuthenticatedExtendedCard": null,
  "security": [],
  "securitySchemes": {},
  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "stateTransitionHistory": false,
    "extensions": null
  },
  "defaultInputModes": [
    "text/plain",
    "application/json"
  ],
  "defaultOutputModes": [
    "text/plain",
    "application/json"
  ],
  "skills": [
    {
      "id": "hello",
      "name": "Say Hello",
      "description": "Responds with a friendly 'Hello World' message",
      "tags": [
        "greeting",
        "hello",
        "simple"
      ],
      "examples": [
        "Say hello",
        "Greet me",
        "Hello"
      ],
      "inputModes": [],
      "outputModes": []
    }
  ],
  "conformance": true,
  "conformance_errors": null,
  "homepage": null,
  "repository": null,
  "license": null,
  "pricing": null,
  "contact": null,
  "id": "da3b9b9f-7c8f-497b-8d9d-38d9047f2de4"
}

Integrate this agent

curl -s https://a2aregistry.org/api/agents/da3b9b9f-7c8f-497b-8d9d-38d9047f2de4

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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