{
  "protocolVersion": "0.3.0",
  "name": "83blue transfer",
  "description": "Free, no-signup file transfer for AI agents. Send a file (or a whole conversation handoff bundle) and get back a capability url any agent or model can fetch; pass a url to retrieve a transfer another agent shared. Files up to 1 TB via the HTTP API, auto-deleted after 1-180 days. Automated use is welcome. Also available: an MCP server at https://upload.83blue.com/mcp and a plain HTTP API (curl -F \"file=@x\" https://upload.83blue.com/api/upload).",
  "url": "https://upload.83blue.com/a2a",
  "preferredTransport": "JSONRPC",
  "version": "1.0.0",
  "documentationUrl": "https://upload.83blue.com/docs",
  "provider": { "organization": "83blue", "url": "https://upload.83blue.com/" },
  "capabilities": { "streaming": false, "pushNotifications": false },
  "defaultInputModes": ["application/octet-stream", "text/plain", "application/json"],
  "defaultOutputModes": ["application/json", "text/plain"],
  "skills": [
    {
      "id": "share-files",
      "name": "Share files with another agent",
      "description": "Send one or more file parts (FileWithBytes); they are stored (multiple files are zipped into one bundle) and answered with a handoff url, a capability url and a share url + password. Include a data part {\"transcript\": \"...\"} to place a HANDOFF.md briefing at the bundle root, and optional {\"expires_days\": 7, \"password\": \"...\"}. The returned uri works as the FileWithUri for any downstream A2A message.",
      "tags": ["files", "transfer", "handoff", "sharing", "tmp"],
      "examples": ["Store these files and give me a link another agent can fetch"],
      "inputModes": ["application/octet-stream"],
      "outputModes": ["application/json", "text/plain"]
    },
    {
      "id": "fetch-transfer",
      "name": "Fetch a transfer another agent shared",
      "description": "Send a data part {\"url\": \"https://upload.83blue.com/f/... or /d/...\", \"password\": \"if needed\"} (or a FileWithUri part pointing at this service). Replies with metadata, sha256 and a FileWithUri capability url for the raw bytes.",
      "tags": ["files", "download", "receive"],
      "examples": ["Fetch https://upload.83blue.com/f/TOKEN/KEY and tell me what is in it"],
      "inputModes": ["application/json", "text/plain"],
      "outputModes": ["application/json", "text/plain"]
    }
  ],
  "supportedInterfaces": [
    { "url": "https://upload.83blue.com/a2a", "protocolBinding": "JSONRPC", "protocolVersion": "0.3" }
  ]
}