Harvest MCP server for AI agents and assistants

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Harvest MCP or direct API to log hours, generate invoices, track project budgets, and pull time reports through natural language.

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Harvest

Oauth2

Harvest is a time-tracking and invoicing platform for teams and freelancers. It helps you log billable hours, manage projects, and streamline payments.

57 Tools

Try Harvest now

Type what you want done — sign in and watch it run live in the Tool Router playground.

TOOL ROUTER PLAYGROUND

Harvest

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TOOLS

Supported Tools

Every Harvest action and event your agent gets out of the box.

Create Client

Tool to create a new client.

Create Client Contact

Tool to create a new client contact.

Create Estimate

Tool to create a new estimate.

Create Estimate Item Category

Tool to create a new estimate item category in Harvest.

Create Estimate Message

Tool to create a new message for an estimate.

Create Expense

Tool to create a new expense entry.

Create Invoice

Tool to create a new invoice.

Create Invoice Item Category

Tool to create a new invoice item category.

Create Invoice Message

Creates a new message for an invoice in Harvest.

Create Invoice Payment

Tool to create a new payment on an invoice.

Create Project

Create a new project in Harvest.

Create Task

Creates a new task in Harvest.

Create Time Entry

Tool to create a new time entry.

Create User

Creates a new user in Harvest and sends an invitation email to the specified address.

Delete Client

Tool to delete a client.

Delete Client Contact

Permanently deletes a client contact from Harvest.

Delete Estimate

Tool to delete an estimate.

Delete Estimate Message

Tool to delete an estimate message.

Delete Invoice

Delete an invoice from Harvest.

Delete Invoice Item Category

Tool to delete an invoice item category from Harvest.

Delete Invoice Message

Tool to delete a message from an invoice.

Delete Invoice Payment

Tool to delete an invoice payment.

Delete Project

Tool to delete a project.

Delete Task

Tool to delete a task.

Delete Time Entry

Tool to delete a time entry.

Delete User

Tool to delete a user.

Get Client

Retrieves a specific client by ID from Harvest.

Get Company Info

Retrieves detailed information about the company associated with the authenticated Harvest account.

Get Estimate

Tool to retrieve a specific estimate by ID.

Get Invoice

Tool to retrieve a specific invoice by ID.

Get Project

Tool to retrieve a specific Harvest project by ID.

Get Task

Tool to retrieve a specific task by ID.

Get Time Entry

Tool to retrieve a single time entry by ID.

Get User

Tool to retrieve a specific user by ID.

List Client Contacts

Tool to list client contacts.

List Clients

Tool to list clients.

List Estimate Messages

Lists all messages associated with a specific estimate in Harvest.

List Expense Categories

Tool to list expense categories.

List Invoice Item Categories

Tool to retrieve invoice item categories.

List Invoice Messages

Tool to list messages associated with a given invoice.

List Invoice Payments

List all payments recorded for a specific invoice.

List Invoices

Tool to list invoices.

List projects

Tool to list projects.

List Tasks

Tool to list tasks.

List Time Entries

Tool to retrieve a list of time entries.

List Users

Tool to list users.

Update Client

Tool to update an existing client.

Update Client Contact

Tool to update a client contact.

Update Company Info

Updates company time tracking settings in Harvest.

Update Estimate

Tool to update an existing estimate.

Update Estimate Item Category

Updates an existing estimate item category's name in Harvest.

Update Expense

Tool to update an existing expense.

Update Invoice

Tool to update an existing invoice.

Update Project

Tool to update an existing project.

Update Task

Tool to update an existing task.

Update Time Entry

Tool to update an existing time entry.

Update User

Tool to update an existing user.

SETUP GUIDE

Connect Harvest MCP Tool with your Agent

Install Composio

typescript

npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai

Install the Composio SDK and your agent framework

Create a session with MCP enabled

typescript

import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["harvest"],
  mcp: true,
});

Create a session scoped to Harvest and read its MCP URL and headers

Connect your agent to the MCP server

typescript

import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Create a new invoice for client Acme Corp with today's billable hours.",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();

Pass the session's MCP URL and headers to your agent and run a Harvest request

SETUP GUIDE

Connect Harvest API Tool with your Agent

Install Composio

typescript

npm install @composio/core @composio/openai openai

Install the Composio SDK, the OpenAI provider, and the OpenAI SDK

Create a Composio session

typescript

import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["harvest"] });
const tools = await session.tools();

Initialize Composio with the OpenAI Responses provider and create a session scoped to Harvest

Run Harvest tools with your agent

typescript

let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Create a new invoice for client Acme Corp with today's billable hours." }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);

Send a request, execute the Harvest tool calls through the session, and print the final answer

Why Use Composio?

AI Native Harvest Integration

Supports both Harvest MCP and direct API based integrations
Structured, LLM-friendly schemas for reliable tool execution
Rich coverage for reading, writing, and querying your Harvest data

Managed Auth

Built-in OAuth handling with automatic token refresh and rotation
Central place to manage, scope, and revoke Harvest access
Per user and per environment credentials instead of hard-coded keys

Agent Optimized Design

Tools are tuned using real error and success rates to improve reliability over time
Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

Fine-grained RBAC so you control which agents and users can access Harvest
Scoped, least privilege access to Harvest resources
Full audit trail of agent actions to support review and compliance

FRAMEWORKS

Use Harvest with any AI Agent Framework

Choose a Framework you want to connect Harvest with

Claude Code

Use Harvest MCP with Claude Code

Claude Cowork

Use Harvest MCP with Claude Cowork

OpenAI Agents SDK

Use Harvest MCP with OpenAI Agents SDK

Claude Agents SDK

Use Harvest MCP with Claude Agents SDK

Codex

Use Harvest MCP with Codex

OpenClaw

Use Harvest MCP with OpenClaw

Hermes

Use Harvest MCP with Hermes

Atomic Agent

Use Harvest MCP with Atomic Agent

Google ADK

Use Harvest MCP with Google ADK

Langchain

Use Harvest MCP with Langchain

AI SDK

Use Harvest MCP with AI SDK

Mastra AI

Use Harvest MCP with Mastra AI

LlamaIndex

Use Harvest MCP with LlamaIndex

CrewAI

Use Harvest MCP with CrewAI

Pydantic AI

Use Harvest MCP with Pydantic AI

Autogen

Use Harvest MCP with Autogen

Rolling this out across your team?

Give your team centralized access control across every framework with Composio’s MCP Gateway.

EXPLORE MCP GATEWAY

MORE TOOLKITS

Explore Other Toolkits

Toolkit marketplace

Google Sheets

Oauth2

Google Sheets is a cloud-based spreadsheet tool for real-time collaboration and data analysis. It lets teams work together from anywhere, updating information instantly.

Notion

Oauth2Api Key

Notion is a collaborative workspace for notes, docs, wikis, and tasks. It streamlines team knowledge, project tracking, and workflow customization in one place.

Airtable

Oauth2Api Key

Airtable combines the flexibility of spreadsheets with the power of a database for easy project and data management. Teams use Airtable to organize, track, and collaborate with custom views and automations.

Asana

Oauth2

Asana is a collaborative work management platform for teams to organize and track projects. It streamlines teamwork, boosts productivity, and keeps everyone aligned on goals.

FAQ

Frequently asked questions

No. Composio provides a managed OAuth app for Harvest, so you sign in with your normal Harvest account and approve access. If you later want the consent screen to show your own company name, you can add your own Harvest OAuth app in the Composio dashboard, and every connection after that uses it.

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Yes. Composio is SOC 2 Type II compliant and is built to keep your Harvest connection and credentials secure. OAuth tokens and API keys are encrypted, and sensitive customer data is protected at rest and in transit.

Composio also undergoes independent security testing and continuously monitors its systems for security threats. You can review the latest reports and policies in the Composio Trust Center.

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

When you connect a Harvest account through Composio, every action runs under that account, so anything the agent creates, sends, or changes shows up in Harvest as done by you. Keep an approval step in your prompt for actions with side effects, such as sending or deleting, and have the agent draft first.

Exactly the ones Harvest lists on its consent screen when you connect. Review that screen before approving. If you connect a work account, your Harvest administrator may need to approve the app first, and you can revoke the access inside Harvest whenever you want.

Yes. Composio supports multiple connected accounts for the same app, and that works in Claude, ChatGPT, or any other assistant you connect through Composio. Give each Harvest connection a name such as work or personal, and the assistant uses the one you mention in the request. Each account keeps its own credentials and nothing is merged.

Composio refreshes Harvest tokens automatically, so day to day you do nothing. If you revoke access inside Harvest, or Harvest invalidates the session, the connection shows as expired in Composio and the agent stops acting on that account until you reconnect it, which is a single sign-in.

Composio's free Hobby plan includes 100,000 tool calls per month with no credit card, and up to 20,000 of those can run through Composio-managed apps like Harvest. Personal Harvest use rarely gets near that. Paid plans add higher limits and team features, and Harvest's own pricing is unaffected.

Built-in connectors usually give one AI access to a limited set of apps. Many people use Composio because it lets their AI connect to more apps than it normally supports, or connect to multiple accounts for the same app (e.g. connect Claude to multiple Harvest accounts).

With Composio, you connect Harvest once and then use it across different AI assistants without setting it up separately in each one. Connect your apps to Composio once, then connect Composio to whichever AI you use, whether that's Claude, ChatGPT, Hermes, or your own custom assistant.

Start with Harvest.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Harvest tool your agent needs.Free to start.

Start building

Harvest MCP server for AI agents and assistants

Try Harvest now

Supported Tools

Connect Harvest MCP Tool with your Agent

Install Composio

Create a session with MCP enabled

Connect your agent to the MCP server

Connect Harvest API Tool with your Agent

Install Composio

Create a Composio session

Run Harvest tools with your agent

Why Use Composio?

AI Native Harvest Integration

Managed Auth

Agent Optimized Design

Enterprise Grade Security

Use Harvest with any AI Agent Framework

Claude Code

Claude Cowork

OpenAI Agents SDK

Claude Agents SDK

Codex

OpenClaw

Hermes

Atomic Agent

Google ADK

Langchain

AI SDK

Mastra AI

LlamaIndex

CrewAI

Pydantic AI

Autogen

Rolling this out across your team?

Explore Other Toolkits

Google Sheets

Notion

Airtable

Asana

Frequently asked questions

Do I need my own Harvest developer credentials or OAuth app?+

Can I use multiple toolkits together?+

Is Composio secure with my Harvest account?+

What if the API changes?+

Does the agent act as me inside Harvest?+

Which Harvest permissions does Composio get?+

Can I use multiple Harvest accounts with Claude and ChatGPT?+

What happens when my Harvest access expires or I revoke it?+

Does using Harvest through Composio cost extra?+

How is Composio different from the Harvest connectors already built into Claude and ChatGPT?+

Start with Harvest.It takes 30 seconds.