> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agentcard.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Runnable example integrations, one per messaging surface

The [example-implementations](https://github.com/tiny-agent-company/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](/companies/getting-started/manual-implementation)).
2. **User auth** — the "Connect with Agentcard" [OAuth flow](/companies/authentication/oauth) with PKCE, run by a small connect/callback server in the same process, tokens persisted per user.
3. **MCP** — a card toolset ([create\_card](/companies/mcp/tools/create_card), [list\_cards](/companies/mcp/tools/list_cards), [get\_card\_details](/companies/mcp/tools/get_card_details), [check\_balance](/companies/mcp/tools/check_balance), [close\_card](/companies/mcp/tools/close_card), [approve\_request](/companies/mcp/tools/approve_request), transactions, [get\_plan](/companies/mcp/tools/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.

## The examples

| Example                                                | Surface                                                                 |
| ------------------------------------------------------ | ----------------------------------------------------------------------- |
| [Photon](/companies/examples/photon)                   | Agent-first iMessage / WhatsApp / Slack framework — the reference build |
| [Sendblue](/companies/examples/sendblue)               | iMessage API for business                                               |
| [LoopMessage](/companies/examples/loopmessage)         | iMessage Conversation API                                               |
| [Linq](/companies/examples/linq)                       | iMessage / SMS / RCS partner API                                        |
| [BlueBubbles](/companies/examples/bluebubbles)         | Open-source self-hosted iMessage server                                 |
| [Twilio](/companies/examples/twilio)                   | Programmable Messaging (SMS/MMS)                                        |
| [Respond.io](/companies/examples/respond-io)           | Omnichannel customer conversation API                                   |
| [Hermes](/companies/examples/hermes)                   | Self-hosted agent messaging gateway (signed webhooks)                   |
| [Vercel Chat SDK](/companies/examples/vercel-chat-sdk) | AI SDK chatbot — a `POST /api/chat` endpoint                            |