# How to connect Harness with ChatGPT

```json
{
  "title": "How to connect Harness with ChatGPT",
  "toolkit": "Harness",
  "toolkit_slug": "harness",
  "framework": "ChatGPT",
  "framework_slug": "chatgpt",
  "url": "https://composio.dev/toolkits/harness/framework/chatgpt",
  "markdown_url": "https://composio.dev/toolkits/harness/framework/chatgpt.md",
  "updated_at": "2026-10-12T12:48:31.569Z"
}
```

## Introduction

### How to connect Harness MCP with ChatGPT
[ChatGPT](https://chatgpt.com/) can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.
In this guide, I will explain the easiest and most secure way to connect your Harness account to ChatGPT via Composio Connect, so it can manage pipelines, trigger executions, inspect run logs, update input sets, and rollback deployments through natural language commands without ever putting your account credentials at risk.

## Also integrate Harness with

- [Claude Cowork](https://composio.dev/toolkits/harness/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/harness/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/harness/framework/atomic-agent)

## TL;DR

### Why use Composio over default connectors?
- Apps with read and write access. Default connectors mostly can read your data. Composio's Harness integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
- 1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
- One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
- Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
- Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

## Connect Harness to ChatGPT

### Prerequisites
- A ChatGPT account. We will use the [ChatGPT desktop app](https://openai.com/chatgpt/download/), and the steps are the same on the web.
- Access to the Harness workspace you want to connect.
- [Composio plugin](https://dashboard.composio.dev/login?utm_source=toolkits&utm_medium=framework_template&utm_campaign=chatgpt&utm_content=composio_connect&next=%2F~%2Forg%2Fconnect%2Fclients%2Fchatgpt).
Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.
### Step-by-step: Connect Harness to ChatGPT
### 1. Install the Composio plugin
Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.
[Install in ChatGPT](https://chatgpt.com/plugins/plugin_asdk_app_6a58503580c08191b78cc5bdaf4eba6e)
You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.
### 2. Authenticate
After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.
### 3. Start using Composio
That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread Harness messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize Harness.
### Option 2: Add Composio as an MCP server
If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.
### 1. Open the MCP settings
In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.
### 2. Add the server
Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

```bash
https://connect.composio.dev/mcp
```

## What is the Harness MCP server, and what's possible with it?

The Harness MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Harness account. It provides structured and secure access to your organizations, projects, pipelines, executions, services, environments, and templates, so your agent can find deployment resources, review pipeline activity, check execution status, inspect service environments, and discover reusable templates on your behalf.
- Organization and project discovery: Have your agent list accessible organizations and projects, then narrow the results by organization, module, or search terms.
- Pipeline exploration: Direct your agent to find pipelines in a project by name, search text, or Git branch.
- Execution monitoring: Let the agent review pipeline executions and filter them by pipeline, status, search text, or ownership.
- Service and environment visibility: Instruct your agent to find project services by deployment type, tags, storage, GitOps state, or search text, and list environments that match your criteria.
- Template discovery: Have your agent search account templates by state, type, name, description, or other search text.

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `HARNESS_LIST_ENVIRONMENTS` | List Environments | List one page of environments in a Harness project, optionally filtered by identifiers or search text. |
| `HARNESS_LIST_EXECUTIONS` | List Pipeline Executions | List one page of pipeline executions in a Harness project, optionally filtered by pipeline, status, search text, or current-user ownership. |
| `HARNESS_LIST_ORGANIZATIONS` | List Organizations | List one page of Harness organizations accessible to the connected account, optionally filtered by identifier or search text. |
| `HARNESS_LIST_PIPELINES` | List Pipelines | List one page of pipelines in a Harness project, optionally filtered by search text or Git branch. |
| `HARNESS_LIST_PROJECTS` | List Projects | List one page of Harness projects accessible to the connected account, optionally within an organization or filtered by module and search text. |
| `HARNESS_LIST_SERVICES` | List Services | List one page of services in a Harness project, optionally filtered by identifiers, deployment type, tags, storage, GitOps state, or search text. |
| `HARNESS_LIST_TEMPLATES` | List Templates | List one page of account-scoped Harness templates, optionally filtered by template state, entity or child type, identifier, name, description, or search text. |

## Supported Triggers

None listed.

## Creating MCP Server - Stand-alone vs Composio SDK

Once connected, ChatGPT can access the Harness MCP server via Composio to run actions that you authorize, directly in your workspace.

## Complete Code

None listed.

## How to build Harness MCP Agent with another framework

- [Claude Cowork](https://composio.dev/toolkits/harness/framework/claude-cowork)
- [Hermes](https://composio.dev/toolkits/harness/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/harness/framework/atomic-agent)

## Related Toolkits

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- [GitHub](https://composio.dev/toolkits/github) - GitHub is a code hosting platform for version control and collaborative software development. It streamlines project management, code review, and team workflows in one place.
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- [Ably](https://composio.dev/toolkits/ably) - Ably is a real-time messaging platform for live chat and data sync in modern apps. It offers global scale and rock-solid reliability for seamless, instant experiences.
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- [Appveyor](https://composio.dev/toolkits/appveyor) - AppVeyor is a cloud-based continuous integration service for building, testing, and deploying applications. It helps developers automate and streamline their software delivery pipelines.
- [Authyo](https://composio.dev/toolkits/authyo) - Authyo is a REST API service for passwordless authentication, OTP verification, session management, and transactional notifications. Use it to add secure login flows and user verification without building auth infrastructure from scratch.
- [AWS Marketplace MCP](https://composio.dev/toolkits/aws_marketplace_mcp) - AWS Marketplace MCP provides MCP access to AWS Marketplace's cloud software, data, and services catalog. Use it to discover, compare, and evaluate 30K+ AWS Marketplace listings faster.
- [Azure Monitor Activity Log](https://composio.dev/toolkits/azure_monitor_activity_log) - Azure Monitor Activity Log is Azure's service that records management and control-plane events for a subscription. Use it to audit changes, troubleshoot issues, and track resource operations across your Azure resources.
- [Backendless](https://composio.dev/toolkits/backendless) - Backendless is a backend-as-a-service platform for mobile and web apps, offering database, file storage, user authentication, and APIs. It helps developers ship scalable applications faster without managing server infrastructure.
- [Baserow](https://composio.dev/toolkits/baserow) - Baserow is an open-source no-code database platform for building collaborative data apps. It makes it easy for teams to organize data and automate workflows without writing code.

## Frequently Asked Questions

### What are the differences in Tool Router MCP and Harness MCP?

With a standalone Harness MCP server, the agents and LLMs can only access a fixed set of Harness tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Harness and many other apps based on the task at hand, all through a single MCP endpoint.

### Can I use Tool Router MCP with ChatGPT?

Yes, you can. ChatGPT fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Harness tools.

### Can I manage the permissions and scopes for Harness while using Tool Router?

Yes, absolutely. You can configure which Harness scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

### How safe is my data with Composio Tool Router?

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Harness data and credentials are handled as safely as possible.

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