# Outreach Client Extensions API

**Canonical:** https://apis.io/apis/outreach/outreach-client-extensions-api/  
**Provider:** Outreach — https://apis.io/providers/outreach/  
**Base URL:** https://api.outreach.io  
**Documentation:** https://developers.outreach.io/client-extensions

Outreach Client Extensions API is one of 5 APIs that [Outreach](https://apis.io/providers/outreach/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Extensions and UI. The published artifact set on APIs.io includes API documentation.

Client extensibility surface for embedding a web application inside the Outreach client — shell, tab and tile web-widget extensions, a text-editor extension, activity-feed custom events and a mailing-links custom tracker — brokered by the @getoutreach/extensibility-sdk JavaScript SDK, which resolves an OutreachContext carrying user, org, account, prospect and opportunity data into the hosted iframe.

## Machine-readable artifacts (2)

- **Documentation** — https://developers.outreach.io/client-extensions
- **Components** — https://raw.githubusercontent.com/api-evangelist/outreach/refs/heads/main/components/outreach-components.yml

## Other Outreach APIs (4)

- [Outreach REST API](https://apis.io/apis/outreach/outreach-rest-api/)
- [Outreach MCP Server](https://apis.io/apis/outreach/outreach-mcp-server/)
- [Outreach Data Sharing](https://apis.io/apis/outreach/outreach-data-sharing/)
- [Outreach Webhooks](https://apis.io/apis/outreach/outreach-webhooks/)

## Tags

Extensions, UI

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/outreach/outreach-client-extensions-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/outreach/.