Outreach Client Extensions API

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.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/outreach-client-extensions-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑
name: Outreach Client Extensions API
description: 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.
humanURL: https://developers.outreach.io/client-extensions
baseURL: https://api.outreach.io
tags:
- Extensions
- UI
properties:
- type: Documentation
  url: https://developers.outreach.io/client-extensions
- type: Components
  url: components/outreach-components.yml