# Harness

```json
{
  "name": "Harness",
  "slug": "harness",
  "url": "https://composio.dev/toolkits/harness",
  "markdown_url": "https://composio.dev/toolkits/harness.md",
  "logo_url": "https://logos.composio.dev/api/harness",
  "categories": [
    "developer tools & devops"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-10-12T12:48:31.569Z"
}
```

![Harness logo](https://logos.composio.dev/api/harness)

## Description

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Harness MCP or direct API to manage pipelines, trigger executions, inspect run logs, and update input sets through natural language.

## Summary

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.

## Categories

- developer tools & devops

## Toolkit Details

- Tools: 7

## Images

- Logo: https://logos.composio.dev/api/harness

## Authentication

- **Api Key**
  - Type: `api_key`
  - Description: Api Key authentication for Harness.
  - Setup:
    - Configure Api Key credentials for Harness.
    - Use the credentials when creating an auth config in Composio.

## Suggested Prompts

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

## 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.

## Installation and MCP Setup

### Path 1: SDK Installation

#### Path 1, Step 1: Install Composio

Install the Composio SDK
```python
pip install composio_openai
```

```typescript
npm install @composio/openai
```

#### Path 1, Step 2: Initialize Composio and Create Tool Router Session

Import and initialize Composio client, then create a Tool Router session
```python
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
openai = OpenAI()
session = composio.create(user_id='your-user-id')
```

```typescript
import OpenAI from 'openai';
import { Composio } from '@composio/core';
import { OpenAIResponsesProvider } from '@composio/openai';

const composio = new Composio({
  provider: new OpenAIResponsesProvider(),
});
const openai = new OpenAI({});
const session = await composio.create('your-user-id');
```

#### Path 1, Step 3: Execute Harness Tools via Tool Router with Your Agent

Get tools from Tool Router session and execute Harness actions with your Agent
```python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'YOUR_SPECIFIC_PROMPT_HERE'
  }]
)
result = composio.provider.handle_tool_calls(
  response=response,
  user_id='your-user-id'
)
print(result)
```

```typescript
const tools = session.tools;
const response = await openai.responses.create({
  model: 'gpt-4.1',
  tools: tools,
  input: [{
    role: 'user',
    content: 'YOUR_SPECIFIC_PROMPT_HERE'
  }],
});
const result = await composio.provider.handleToolCalls(
  'your-user-id',
  response.output
);
console.log(result);
```

### Path 2: MCP Server Setup

#### Path 2, Step 1: Install Composio

Install the Composio SDK for Python or TypeScript
```python
pip install composio claude-agent-sdk
```

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

#### Path 2, Step 2: Initialize Client and Create Tool Router Session

Import and initialize the Composio client, then create a Tool Router session for Harness
```python
from composio import Composio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions

composio = Composio(api_key='your-composio-api-key')
session = composio.create(user_id='your-user-id')
url = session.mcp.url
```

```typescript
import { Composio } from '@composio/core';

const composio = new Composio({ apiKey: 'your-api-key' });
const session = await composio.create('your-user-id');
console.log(`Tool Router session created: ${session.mcp.url}`);
```

#### Path 2, Step 3: Connect to AI Agent

Use the MCP server with your AI agent (Anthropic Claude or Mastra)
```python
import asyncio

options = ClaudeAgentOptions(
    permission_mode='bypassPermissions',
    mcp_servers={
        'tool_router': {
            'type': 'http',
            'url': url,
            'headers': {
                'x-api-key': 'your-composio-api-key'
            }
        }
    },
    system_prompt='You are a helpful assistant with access to Harness tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('YOUR_SPECIFIC_PROMPT_HERE')
        async for message in client.receive_response():
            if hasattr(message, 'content'):
                for block in message.content:
                    if hasattr(block, 'text'):
                        print(block.text)

asyncio.run(main())
```

```typescript
import { openai } from '@ai-sdk/openai';
import { experimental_createMCPClient as createMCPClient } from '@ai-sdk/mcp';
import { generateText } from 'ai';

const client = await createMCPClient({
  transport: {
    type: 'http',
    url: session.mcp.url,
    headers: {
      'x-api-key': 'your-composio-api-key',
    },
  },
});

const tools = await client.tools();
const { text } = await generateText({
  model: openai('gpt-4o'),
  tools,
  messages: [{
    role: 'user',
    content: 'YOUR_SPECIFIC_PROMPT_HERE'
  }],
  maxSteps: 5,
});

console.log(`Agent: ${text}`);
```

## Why Use Composio?

### 1. AI Native Harness Integration

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

### 2. Managed Auth

- Built-in API key handling with secure storage
- Central place to manage, scope, and revoke Harness access
- Per user and per environment credentials instead of hard-coded keys

### 3. 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

### 4. Enterprise Grade Security

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

## Use Harness with any AI Agent Framework

Choose a framework you want to connect 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)
- [Atomic Agent](https://composio.dev/toolkits/harness/framework/atomic-agent)

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## Frequently Asked Questions

### Do I need my own developer credentials to use Harness with Composio?

Yes, Harness requires you to configure your own API key credentials. Once set up, Composio handles secure credential storage and API request handling for you.

### Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. [Learn more](https://docs.composio.dev/tool-router/overview).

### Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. [Learn more](https://trust.composio.dev).

### What if the API changes?

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

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)