Integrations

Once your app is online (see Quickstart), install the SDK to call third-party APIs without managing OAuth yourself. Users connect their accounts on the Leash dashboard once; every app in the org gets typed access on their behalf.

Each provider below has its own reference page with the full tool list. For the wiring story end-to-end, see Building with Leash.

REST providers

Full typed methods in the SDK, fastest execution.

Name	SDK module	Tools	Description
Gmail	`integrations.gmail`	6 tools	Send emails, search messages, manage labels
Google Calendar	`integrations.calendar`	4 tools	List, create, and manage calendar events
Google Drive	`integrations.drive`	7 tools	List, search, upload, and download files

MCP providers

Auto-generated typed methods from MCP server definitions, executed via the MCP runner.

Name	SDK module	Tools	Description
HubSpot	`integrations.hubspot`	21 tools	Manage contacts, deals, companies, and tickets
Slack	`integrations.slack`	8 tools	Send messages, read channels, manage conversations
Linear	`integrations.linear`	24 tools	Create and manage issues, projects, and teams
Jira	`integrations.jira`	5 tools	Manage issues, boards, sprints, and projects
GitHub	`integrations.github`	26 tools	Repos, issues, pull requests, and code search
Gong	`integrations.gong`	12 tools	Call recordings, transcripts, and deal intelligence
BigQuery	`integrations.bigquery`	1 tool	Run SQL queries on Google BigQuery
Slite	`integrations.slite`	6 tools	Search and manage documentation
Brave Search	`integrations.braveSearch`	2 tools	Web and local search
Filesystem	`integrations.filesystem`	14 tools	Read, write, and manage files
Memory	`integrations.memory`	9 tools	Knowledge graph for persistent memory
Puppeteer	`integrations.puppeteer`	7 tools	Browser automation and screenshots

Typical usage

Inside an API route — credentials are auto-resolved from the calling user's connection or from the org's configured client.

app/api/issues/route.ts

import { Leash } from '@leash/sdk/leash'

export async function GET(req: Request) {
  const leash = new Leash({ request: req })

  // REST integration
  const messages = await leash.integrations.gmail.listMessages({ maxResults: 5 })

  // MCP integration
  const { issues } = await leash.integrations.linear.listIssues({ teamId: 'ENG' })

  return Response.json({ messages, issues })
}

The TypeScript SDK (@leash/sdk) is the reference implementation of the 0.4 Leash() client shape. Python, Go, Ruby, Java, and Rust SDKs are tracking the same shape — aspirational samples shown here; separate parity tickets track each language SDK rebuild.

Need something not on this list?

Register your own MCP server (internal tools, third-party MCPs we haven't shipped yet, anything that speaks the MCP protocol).

Custom MCP cookbook — register an Intercom or in-house MCP server
SDK reference for custom MCP servers
Custom OAuth providers — bring your own OAuth client when the upstream isn't MCP