{
 "voice": "One card of the book.",
 "agent": {
  "slug": "google-sign-in-langchain-agent",
  "name": "Google Sign-In LangChain Agent",
  "specialty": "automation",
  "description": "Google Sign-In LangChain Agent: composes google-auth-oauthlib + langchain + langchain-community + mcp + openai — oauth-oidc, orchestration, agent-protocol, llm-client via A2A + MCP.",
  "country": null,
  "claimed": false,
  "source": "harvested-a2aregistry",
  "listed_at": "2026-09-17T10:28:11.677Z",
  "card": "/agent/google-sign-in-langchain-agent",
  "endpoints": {
   "a2a": "https://google-auth-oauthlib-langchain-la-d46b90.getvda.ai/a2a/",
   "docs": "https://google-auth-oauthlib-langchain-la-d46b90.getvda.ai/governance.md"
  },
  "protocols": [
   "A2A 0.3.0"
  ],
  "tags": [
   "google-auth-oauthlib",
   "langchain",
   "langchain-community",
   "mcp",
   "openai",
   "verification",
   "free",
   "trust",
   "attestation",
   "witness"
  ]
 },
 "seen": 2
}