# How to integrate Harness MCP with Atomic Agent

```json
{
  "title": "How to integrate Harness MCP with Atomic Agent",
  "toolkit": "Harness",
  "toolkit_slug": "harness",
  "framework": "Atomic Agent",
  "framework_slug": "atomic-agent",
  "url": "https://composio.dev/toolkits/harness/framework/atomic-agent",
  "markdown_url": "https://composio.dev/toolkits/harness/framework/atomic-agent.md",
  "updated_at": "2026-10-12T12:48:31.569Z"
}
```

## Introduction

Atomic Agent is an open-source AI agent that runs on your machine and supports local models through llama.cpp. Connect it to 1,500+ apps through Composio, including Harness.
This guide uses Atomic Agent's built-in Composio integration. You need Atomic Agent v0.5.6 or later, your own Composio API key, and a Harness account. See the [Atomic Agent documentation](https://atomicagent.io/docs/?cta_placement=atomic-agent-docs) for installation instructions.

## Also integrate Harness with

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

## TL;DR

### How Atomic Agent connects to Harness
Atomic Agent connects to Composio's Tool Router over Streamable HTTP MCP. It discovers the tools needed for your request, and Composio handles account authentication.
Execution and account-connection tools follow Atomic Agent's configured approval policy. Review any approval prompt before allowing an action on your connected account.

## Connect Harness to Atomic Agent

### Connect Harness to Atomic Agent
- Sign up or sign in to the [Composio dashboard](https://dashboard.composio.dev/?cta_placement=atomic-agent-api-key). Copy your API key.
- In Atomic Agent, open the Integrations tab and select Composio. Select API key, press e, paste the key, and press Enter. The tools become available immediately, without a restart.
- Ask Atomic Agent to do something in Harness. It searches Composio for the right tool.
- On first use, open the sign-in link returned in the chat. Connect your Harness account, then return to Atomic Agent to continue.
### Headless setup
Add the following line to ~/.atomic-agent/.env, replacing YOUR_COMPOSIO_API_KEY with your key. Start Atomic Agent after saving the file.

```bash
COMPOSIO_API_KEY=YOUR_COMPOSIO_API_KEY
```

## 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.

## Troubleshooting

### Why is my API key rejected?

Copy the key directly from the Composio dashboard. Atomic Agent requires ASCII characters because it sends the key in an HTTP header. Remove any extra characters introduced when copying.

### Why are Composio tools unavailable after saving a key?

Check that you use Atomic Agent v0.5.6 or later and that Composio is enabled in your configuration. A "composio": { "enabled": false } setting disables the integration while keeping the saved key on disk.

### Does Composio have a free plan?

The Hobby plan includes 100,000 tool calls per month. Composio-managed OAuth apps have a lower included allowance. See [Composio pricing](/pricing) for the current limits that apply to your connection.

## Complete Code

None listed.

## Conclusion

### Use Harness from Atomic Agent
With your account connected, ask Atomic Agent to work with Harness in natural language. You can connect more apps through the same Composio integration as you need them.
Visit the [Atomic Agent website](https://atomicagent.io/?cta_placement=atomic-agent-site) or inspect the [Atomic Agent source code](https://github.com/AtomicBot-ai/atomic-agent?cta_placement=atomic-agent-repo).

## How to build Harness MCP Agent with another framework

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

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## 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 Atomic Agent?

Yes, you can. Atomic Agent 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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