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The example-implementations repo has one runnable, tested example per messaging tool. Every folder is the same minimal Claude agent — a brain with per-conversation memory behind a provider-agnostic message loop — wired to a different vendor’s API, with a complete Agentcard for companies integration:
  1. Client — self-registers a public OAuth client at startup via Dynamic Client Registration (pin AGENTCARD_OAUTH_CLIENT_ID to use your own instead; production apps usually pin a client).
  2. User auth — the “Connect with Agentcard” OAuth flow with PKCE, run by a small connect/callback server in the same process, tokens persisted per user.
  3. MCP — a card toolset (create_card, list_cards, get_card_details, check_balance, close_card, approve_request, transactions, get_plan) called with each user’s token — cards isolated per app and user.
Every example runs locally in terminal mode with zero vendor credentials (bun run dev), and each ships offline e2e, provider, and contract tests.

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The examples

ExampleSurface
PhotonAgent-first iMessage / WhatsApp / Slack framework — the reference build
SendblueiMessage API for business
LoopMessageiMessage Conversation API
LinqiMessage / SMS / RCS partner API
BlueBubblesOpen-source self-hosted iMessage server
TwilioProgrammable Messaging (SMS/MMS)
Respond.ioOmnichannel customer conversation API
HermesSelf-hosted agent messaging gateway (signed webhooks)
Vercel Chat SDKAI SDK chatbot — a POST /api/chat endpoint