---
title: "Declared platform capabilities — branch on these instead of guessing [read]"
method: GET
path: "/channels/connections/{id}/capabilities"
tags: ["channels"]
---

# Declared platform capabilities — branch on these instead of guessing \[read\]

`GET /channels/connections/{id}/capabilities`

## Request

- Base URL: `https://api.agentsky.dev/v1`
- URL: `https://api.agentsky.dev/v1/channels/connections/{id}/capabilities`
- Auth: HTTP bearer

## Path parameters

- `id` string, required

## Response `200`

OK

- ChannelCapabilities
  - `connection_id` string
  - `platform` string
  - `history_source` 'provider' | 'sdk_cache' | 'unavailable': History origin; unavailable returns 501 rather than an empty history.
  - `capabilities` object: threads · reactions · markers · proactive · markdown · modals · ephemeral · streaming · files

## Other responses

- `default`: Error — { error: { code, message } }

## Changes

- **2026-11-02** `e5e8f0229a99`: 2 info
  - added the optional property `error/request_id` to the response with the `default` status
  - added the optional property `history_source` to the response with the `200` status

[Operation history](https://skmtc.dev/agentsky/apis/agentsky-developer-api/changes/channels/connections/:id/capabilities/get.md)

---

[API](https://skmtc.dev/agentsky/apis/agentsky-developer-api.md) - [All operations](https://skmtc.dev/agentsky/apis/agentsky-developer-api/llms.txt) - [OpenAPI document](https://skmtc.dev/agentsky/apis/agentsky-developer-api/revisions/8280a065ef6a?raw)