Overview - Corsair

Use Harvest through Corsair: one client, typed API calls, local DB sync. What you get:

57 typed API operations
10 synced entities (clients, company, contacts, estimates, expenseCategories, invoiceItemCategories, and 4 more) for fast .search() / .list()

Setup

Install

npm install corsair @corsair-dev/harvest

yarn add corsair @corsair-dev/harvest

pnpm install corsair @corsair-dev/harvest

bun add corsair @corsair-dev/harvest

Add the plugin

corsair.ts

import Database from 'better-sqlite3';
import { createCorsair } from 'corsair';
import { harvest } from '@corsair-dev/harvest';

export const corsair = createCorsair({
	plugins: [
		harvest(),
	],
	database: new Database('corsair.db'),
	kek: process.env.CORSAIR_KEK!,
	hub: {
		projectApiKey: process.env.CORSAIR_DEV_API_KEY!,
		signingSecret: process.env.CORSAIR_DEV_SIGNING_SECRET!,
	},
});

Multi-tenancy is the default — scope calls with corsair.withTenant(id). See Quick start for KEK + Hub keys, and Multi-tenancy for account isolation.

Choose authentication

OAuth 2.0 (Recommended)

Open hub.corsair.dev, navigate to your project, and enter the client ID and client secret from your Harvest OAuth app.

harvest()

More: OAuth 2.0

Connect a tenant

Mint a connect link and send the tenant to it. Hub hosts the page and delivers the result to your app — see Connect / OAuth.

const { connectUrl } = await corsair.manage.connect.createLink({
	plugin: 'harvest',
	tenantId: 'acme',
});
// redirect the user's browser to connectUrl

Example API calls

clients.get

const tenant = corsair.withTenant('acme');
await tenant.harvest.api.clients.get({});

clients.create

const tenant = corsair.withTenant('acme');
await tenant.harvest.api.clients.create({});

See the full list on the API page.

Query synced data

Synced entities support tenant.harvest.db.<entity>.search() and .list(): clients, company, contacts, estimates, expenseCategories, invoiceItemCategories, invoices, projects, tasks, users. See Database for filters and operators.

What’s next

API reference

Every harvest.api.* operation with input and output types.

Database

Synced entities, search filters, and operators.

Connect / OAuth

createLink, Hub delivery, and tenant connect flows.

Use with agents

Expose this plugin’s operations as MCP tools.

​Setup

​Example API calls

​Query synced data

​What’s next