How to integrate Harness MCP with Hermes

Connect Hermes 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.

Harness logoHarness
Api Key

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.

7 Tools

Introduction

Hermes is a 24/7 autonomous agent that lives on your computer or server — it remembers what it learns and evolves as your usage grows.

This guide explains the easiest and most robust way to connect your Harness account to Hermes. You can do this through either Composio Connect CLI or Composio Connect MCP. For personal use we recommend the CLI, but you won't go wrong with MCP either.

Also integrate Harness with

What is Composio Connect?

Composio Connect is a consumer offering that lets anyone plug 1,500+ applications directly into their agent harness — including Hermes. It can:

  • Search and load tools from relevant toolkits on-demand, reducing context usage.
  • Chain multiple tools to accomplish complex workflows via a remote workbench, without excessive back-and-forth with the LLM.
  • Manage app authentication end-to-end with zero manual overhead.

Integrating Harness with Hermes

Using Composio Connect CLI

1. Install the Composio CLI

Run the install script directly, or paste https://composio.dev/hermes into your Hermes chat box to have it installed for you.

bash
curl -fsSL https://composio.dev/install | bash
Hermes authenticating with Composio

2. Authenticate

Once the CLI is installed, ask Hermes to authenticate with Composio.

3. Connect to Harness

Ask your agent to connect to Harness, or simply request any Harness-related task. Hermes will prompt you to authenticate and authorize access.

4. Done. You're all set with a new Harness connection.


Using Composio Connect MCP

1. Get your MCP URL and API Key

Go to dashboard.composio.dev and copy your Connect MCP URL and API key.

Copy MCP URL and API key from Composio dashboard

2. Open the Hermes config file

bash
nano ~/.hermes/config.yaml

3. Add the Composio Connect MCP server

bash
mcp_servers:
  composio:
    url: "https://connect.composio.dev/mcp"
    headers:
      x-consumer-api-key: "YOUR_COMPOSIO_API_KEY"
    connect_timeout: 60
    timeout: 180

Save with Ctrl + O, Enter, then exit with Ctrl + X.

4. Restart your Hermes agent

Once restarted, ask your agent to connect to Harness or request any Harness-related task. It will prompt you to authenticate and authorize access.

5. Done!

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.

Way Forward

With Harness connected, Hermes can now act on your behalf whenever it detects a relevant task or you ask it to.

From here, you can extend Hermes further:

  • Connect more apps: Calendar, Slack, Notion, Linear, and hundreds of others are available through the same Composio Connect setup. Each new integration compounds what Hermes can do for you.
  • Build workflows across tools: Once multiple apps are connected, Hermes can chain actions together — turn an email into a calendar invite, a Slack message into a Linear ticket, or a meeting note into a follow-up draft.
  • Let it learn your patterns: The more you use Hermes, the better it gets at anticipating how you'd handle recurring tasks. Give it feedback on drafts and decisions, and it will adapt.

If you run into trouble or want to share what you've built, join the community or check out the Docs for deeper configuration options.

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.

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. Hermes 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.

Start with Harness.It takes 30 seconds.

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

Start building