> ## Documentation Index
> Fetch the complete documentation index at: https://docs.groundforge.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Channels
> Create a Channel, publish its callback, and test delivery safely.
Open **Channels** in [platform.groundforge.ai](https://platform.groundforge.ai) and choose a provider.
| Twilio | Mailgun | Slack | Webhook |
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## 1. Create the Channel
Enter the provider-specific sender, credential, verification, and delivery settings. Save the Channel in the same Workspace as the Agent.
> **Screenshot placeholder**\
> Add `/images/platform/channel-create.png` showing the provider picker and Channel form.
## 2. Attach it to an Agent
Open the Agent, select the Channel, save, and publish the Agent. GroundForge then shows the recommended callback URL:
```text theme={null}
https://platform.groundforge.ai/v1/agents/{agent_id}/channels/{channel_id}/callback
```
Copy that exact URL into Twilio, Mailgun, Slack, or your webhook sender. Do not construct the IDs yourself.
## 3. Preview a test
Twilio WhatsApp:
```bash theme={null}
export TEST_WHATSAPP_TO="whatsapp:+"
gforge channels test \
--to "$TEST_WHATSAPP_TO" \
--body "What is the weather in Ottawa?" \
--dry-run \
-o yaml
```
Mailgun:
```bash theme={null}
gforge channels test \
--to "" \
--subject "Weather request" \
--body "What is the weather in Ottawa?" \
--dry-run \
-o yaml
```
The dry run prints the request without sending a provider message.
## 4. Send the test
Run the same command without `--dry-run`. Then open the Channel and Trace pages to confirm provider delivery and Agent execution separately.
## Example
Use the Channel with [LangChain Agent Example](/examples/langchain-agent), then follow either [Twilio WhatsApp](/guides/twilio-whatsapp) or [Mailgun](/guides/mailgun).
See [CLI Resources](/cli/resources) for more `channels` options.
## Related topics
- [Channels](/concepts/channels.md)
- [Get Channel](/api-reference/endpoints/channels/get-channel.md)
- [Test Channel](/api-reference/endpoints/channels/test-channel.md)
- [Update Channel](/api-reference/endpoints/channels/update-channel.md)