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

# Channel Adapters

These extensions connect your Agent to real-world messaging platforms through the Harness [Channel](/v2/en/docs/harness/channel) interface. Each adapter handles platform-specific authentication, webhook verification, message parsing, and reply delivery — so your Agent code stays platform-agnostic.

| Extension                                       | Platform           | Transport                              |
| ----------------------------------------------- | ------------------ | -------------------------------------- |
| [DingTalk](/v2/en/integration/channel/dingtalk) | DingTalk (钉钉)      | Stream protocol (persistent WebSocket) |
| [Feishu](/v2/en/integration/channel/feishu)     | Feishu / Lark (飞书) | Event subscription callback (HTTP)     |
| [GitHub](/v2/en/integration/channel/github)     | GitHub             | Webhook (HTTP)                         |
| [GitLab](/v2/en/integration/channel/gitlab)     | GitLab             | Webhook (HTTP)                         |
| [WeCom](/v2/en/integration/channel/wecom)       | WeCom (企业微信)       | Encrypted callback (HTTP)              |

## How it works

Each channel adapter follows the same pattern:

1. **Inbound** — receives messages from the platform (via webhook, WebSocket, etc.), parses them into a normalized `InboundMessage`, deduplicates, applies bot-loop protection, and dispatches through the Gateway.
2. **Outbound** — delivers agent replies back to the platform through the platform's send API.

All adapters share two common utilities from `agentscope-extensions-channel-common`:

* **IdempotencyStore** — deduplicates retried webhook deliveries by message id.
* **BotLoopGuard** — per-peer rate limiter that prevents runaway bot-to-bot loops.

## Shared dependency

Every channel adapter depends on `agentscope-extensions-channel-common` (included transitively) and `agentscope-harness` (provided at runtime by your application).