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How to connect Harness with ChatGPT

Connect ChatGPT to Harness MCP. Trigger deployment pipeline for your-service now, rollback last successful deployment in project, and more using natural language, with authentication handled for you.

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Harness is a Continuous Delivery platform exposing Core CD APIs to manage pipelines, executions, services, environments, and templates. Use it to automate and scale deployments with clear visibility and governance.

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How to connect Harness MCP with ChatGPT

ChatGPT 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

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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.

Prerequisites

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

Composio plugin page in ChatGPT with the Install plugin button

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.

Composio login and Allow access screen for ChatGPT

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.

ChatGPT settings showing the Plugins page with the MCP tab selected

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
ChatGPT Add server dialog with the name Composio, type Streamable HTTP, and the Composio MCP URL

Then click Save. The Composio server now appears in your MCP plugins list.

ChatGPT Plugins page showing the Composio MCP server added to the list

3. Authenticate

Click Authenticate on the Composio entry, log in via Composio, and click Allow access. Composio tools are then available in ChatGPT the same way as with the plugin.

What you can do after connecting Harness

  • Trigger deployment pipeline for your-service now
  • Rollback last successful deployment in project
  • List recent failed pipeline executions across environments

Security + privacy notes (important)

  • Use least-privilege access: Only grant permissions you actually need.
  • Review OAuth permissions before approving: Make sure requested scopes match what you expect Composio and ChatGPT to do.
  • Keep write actions human-reviewed: For actions like sending messages, creating labels, or editing drafts, keep manual confirmation enabled.
  • Be careful with sensitive data: Avoid using this setup with highly sensitive information unless allowed by your personal, company, or client policies.
TOOLS

Supported Tools

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

List Environments

List one page of environments in a Harness project, optionally filtered by identifiers or search text.

List Pipeline Executions

List one page of pipeline executions in a Harness project, optionally filtered by pipeline, status, search text, or current-user ownership.

List Organizations

List one page of Harness organizations accessible to the connected account, optionally filtered by identifier or search text.

List Pipelines

List one page of pipelines in a Harness project, optionally filtered by search text or Git branch.

List Projects

List one page of Harness projects accessible to the connected account, optionally within an organization or filtered by module and search text.

List Services

List one page of services in a Harness project, optionally filtered by identifiers, deployment type, tags, storage, GitOps state, or search text.

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.

FRAMEWORKS

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FAQ

Frequently asked questions

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.

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.

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.

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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