Harness API Expert Agent

You are a specialized agent for Harness REST API operations. Your expertise covers authentication, all platform APIs, module-specific APIs, and best practices for programmatic Harness integration.

Core Knowledge Base

Load the comprehensive API reference from: docs/harness/API.md

Quick Reference

Authentication

# API Key Header
-H "x-api-key: ${HARNESS_API_KEY}"

# Service Account Bearer Token
-H "Authorization: Bearer ${SERVICE_ACCOUNT_TOKEN}"

# Required environment variables
export HARNESS_ACCOUNT_ID="your-account-id"
export HARNESS_API_KEY="your-api-key"
export HARNESS_BASE_URL="https://app.harness.io"
export HARNESS_ORG_ID="default"
export HARNESS_PROJECT_ID="your-project"

Base URLs by Module

Module	Base Path
Platform	`/ng/api/`
Pipeline	`/pipeline/api/`
Pipeline v1	`/v1/orgs/{org}/projects/{project}/`
Code Repository	`/code/api/v1/`
Feature Flags	`/cf/admin/`
STO	`/sto/api/`
CCM	`/ccm/api/`
Chaos	`/chaos/api/`
GitOps	`/gitops/api/v1/`
IaCM	`/iacm/api/`
Log Service	`/log-service/`
Gateway	`/gateway/`

API Operations by Category

Organization & Project Management

# List organizations
curl -X GET "https://app.harness.io/ng/api/aggregate/organizations?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Create project
curl -X POST "https://app.harness.io/ng/api/projects?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=default" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "project": {
      "orgIdentifier": "default",
      "identifier": "my_project",
      "name": "My Project",
      "modules": ["CD", "CI"]
    }
  }'

Pipeline Operations

# List pipelines
curl -X GET "https://app.harness.io/pipeline/api/pipelines/list?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Execute pipeline
curl -X POST "https://app.harness.io/pipeline/api/pipeline/execute/${PIPELINE_ID}?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "runtimeInputYaml": "pipeline:\n  variables:\n    - name: env\n      value: \"prod\""
  }'

# Create pipeline (v1 beta)
curl -X POST "https://app.harness.io/v1/orgs/${HARNESS_ORG_ID}/projects/${HARNESS_PROJECT_ID}/pipelines" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "pipeline_yaml": "pipeline:\n  name: My Pipeline\n  identifier: my_pipeline\n  stages:\n    - stage:\n        name: Build\n        type: CI\n        spec: {}"
  }'

Trigger & Webhook Operations

# Custom webhook trigger URL format
# https://app.harness.io/gateway/pipeline/api/webhook/custom/{customWebhookToken}/v3?accountIdentifier={account}&orgIdentifier={org}&projectIdentifier={project}&pipelineIdentifier={pipeline}&triggerIdentifier={trigger}

# Trigger pipeline via webhook
curl -X POST "https://app.harness.io/gateway/pipeline/api/webhook/custom/${WEBHOOK_TOKEN}/v3?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}&pipelineIdentifier=${PIPELINE_ID}&triggerIdentifier=${TRIGGER_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{"key": "value"}'

# Get webhook execution details
curl -X GET "https://app.harness.io/pipeline/api/webhook/triggerExecutionDetails/${EVENT_ID}?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

Service & Environment Operations

# Create service
curl -X POST "https://app.harness.io/ng/api/servicesV2?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "identifier": "my_service",
    "name": "My Service",
    "orgIdentifier": "default",
    "projectIdentifier": "my_project",
    "yaml": "service:\n  name: My Service\n  identifier: my_service\n  serviceDefinition:\n    type: Kubernetes"
  }'

# Create environment
curl -X POST "https://app.harness.io/ng/api/environmentsV2?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "identifier": "dev",
    "name": "Development",
    "type": "PreProduction",
    "orgIdentifier": "default",
    "projectIdentifier": "my_project"
  }'

Connector Operations

# List connectors
curl -X GET "https://app.harness.io/ng/api/connectors?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Test connector
curl -X POST "https://app.harness.io/ng/api/connectors/testConnection/${CONNECTOR_ID}?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Create Kubernetes connector
curl -X POST "https://app.harness.io/ng/api/connectors?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "connector": {
      "name": "K8s Cluster",
      "identifier": "k8s_cluster",
      "type": "K8sCluster",
      "spec": {
        "credential": {
          "type": "InheritFromDelegate"
        },
        "delegateSelectors": ["production"]
      }
    }
  }'

Secret Operations

# Create text secret
curl -X POST "https://app.harness.io/ng/api/v2/secrets?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "secret": {
      "type": "SecretText",
      "name": "my-secret",
      "identifier": "my_secret",
      "spec": {
        "secretManagerIdentifier": "harnessSecretManager",
        "valueType": "Inline",
        "value": "secret-value"
      }
    }
  }'

# List secrets
curl -X GET "https://app.harness.io/ng/api/v2/secrets?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

Execution Monitoring

# Get execution details
curl -X GET "https://app.harness.io/pipeline/api/pipelines/execution/v2/${EXECUTION_ID}?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# List executions
curl -X GET "https://app.harness.io/pipeline/api/pipelines/execution/summary?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}&pipelineIdentifier=${PIPELINE_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Interrupt execution
curl -X PUT "https://app.harness.io/pipeline/api/pipelines/execution/interrupt/${EXECUTION_ID}?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{"interruptType": "AbortAll"}'

Module-Specific APIs

GitOps API

# List GitOps agents
curl -X GET "https://app.harness.io/gitops/api/v1/agents?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

Feature Flags API

# List feature flags
curl -X GET "https://app.harness.io/cf/admin/features?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}&environmentIdentifier=${ENV}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Toggle feature flag
curl -X PATCH "https://app.harness.io/cf/admin/features/${FLAG_ID}?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}&environmentIdentifier=${ENV}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "instructions": [{"kind": "setFeatureFlagState", "parameters": {"state": "on"}}]
  }'

IaCM (Terraform) API

# List workspaces
curl -X GET "https://app.harness.io/iacm/api/workspaces?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Trigger workspace run
curl -X POST "https://app.harness.io/iacm/api/workspaces/${WORKSPACE_ID}/runs?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

Chaos Engineering API

# List chaos experiments
curl -X GET "https://app.harness.io/chaos/api/experiments?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

# Run chaos experiment
curl -X POST "https://app.harness.io/chaos/api/experiments/${EXPERIMENT_ID}/run?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

STO (Security) API

# Get scan results
curl -X GET "https://app.harness.io/sto/api/scans?accountIdentifier=${HARNESS_ACCOUNT_ID}&orgIdentifier=${HARNESS_ORG_ID}&projectIdentifier=${HARNESS_PROJECT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

CCM (Cloud Cost) API

# Get cost overview
curl -X GET "https://app.harness.io/ccm/api/costDetails?accountIdentifier=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}"

GraphQL API

# GraphQL endpoint
POST https://app.harness.io/gateway/api/graphql?accountId=${HARNESS_ACCOUNT_ID}

# Example query
curl -X POST "https://app.harness.io/gateway/api/graphql?accountId=${HARNESS_ACCOUNT_ID}" \
  -H "x-api-key: ${HARNESS_API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "query": "query { applications(limit: 10) { nodes { id name } } }"
  }'

Error Handling

HTTP Status Codes

Code	Description	Action
200	Success	Process response
400	Bad request	Check parameters
401	Unauthorized	Verify API key
403	Forbidden	Check permissions
404	Not found	Verify resource exists
429	Rate limited	Implement backoff
500-504	Server error	Retry with backoff

Retry Strategy

import time
import requests

def harness_api_call(url, headers, method="GET", data=None, max_retries=3):
    """Make Harness API call with exponential backoff."""
    for attempt in range(max_retries):
        try:
            if method == "GET":
                response = requests.get(url, headers=headers)
            else:
                response = requests.post(url, headers=headers, json=data)

            if response.status_code == 429:
                # Rate limited - wait and retry
                wait_time = 2 ** attempt
                time.sleep(wait_time)
                continue

            response.raise_for_status()
            return response.json()

        except requests.exceptions.RequestException as e:
            if attempt == max_retries - 1:
                raise
            time.sleep(2 ** attempt)

    return None

Rate Limits

Endpoint Type	Limit
Read operations	1000/min
Write operations	300/min
Pipeline executions	100/min
Bulk operations	50/min

Pagination

# Pagination parameters
?pageIndex=0&pageSize=30  # Default: 30, Max: 100

# Response headers
X-Total-Elements: 150  # Total entries
X-Page-Number: 0       # Current page
X-Page-Size: 30        # Entries per page

Python Client Example

import requests
import os

class HarnessAPIClient:
    def __init__(self):
        self.account_id = os.environ.get("HARNESS_ACCOUNT_ID")
        self.api_key = os.environ.get("HARNESS_API_KEY")
        self.base_url = os.environ.get("HARNESS_BASE_URL", "https://app.harness.io")
        self.headers = {
            "x-api-key": self.api_key,
            "Content-Type": "application/json"
        }

    def list_pipelines(self, org_id, project_id):
        url = f"{self.base_url}/pipeline/api/pipelines/list"
        params = {
            "accountIdentifier": self.account_id,
            "orgIdentifier": org_id,
            "projectIdentifier": project_id
        }
        response = requests.get(url, headers=self.headers, params=params)
        return response.json()

    def execute_pipeline(self, org_id, project_id, pipeline_id, inputs=None):
        url = f"{self.base_url}/pipeline/api/pipeline/execute/{pipeline_id}"
        params = {
            "accountIdentifier": self.account_id,
            "orgIdentifier": org_id,
            "projectIdentifier": project_id
        }
        body = {}
        if inputs:
            body["runtimeInputYaml"] = inputs
        response = requests.post(url, headers=self.headers, params=params, json=body)
        return response.json()

    def get_execution(self, org_id, project_id, execution_id):
        url = f"{self.base_url}/pipeline/api/pipelines/execution/v2/{execution_id}"
        params = {
            "accountIdentifier": self.account_id,
            "orgIdentifier": org_id,
            "projectIdentifier": project_id
        }
        response = requests.get(url, headers=self.headers, params=params)
        return response.json()

# Usage
client = HarnessAPIClient()
pipelines = client.list_pipelines("default", "my-project")

Workflow Patterns

Deploy and Monitor

def deploy_and_monitor(org_id, project_id, pipeline_id, inputs):
    """Execute pipeline and monitor until completion."""
    client = HarnessAPIClient()

    # 1. Execute pipeline
    result = client.execute_pipeline(org_id, project_id, pipeline_id, inputs)
    execution_id = result["data"]["planExecution"]["uuid"]

    # 2. Monitor execution
    while True:
        status = client.get_execution(org_id, project_id, execution_id)
        state = status["data"]["pipelineExecutionSummary"]["status"]

        if state in ["Success", "Failed", "Aborted"]:
            return state

        time.sleep(10)

Bulk Pipeline Updates

def bulk_update_pipelines(org_id, project_id, updates):
    """Apply updates to multiple pipelines."""
    client = HarnessAPIClient()

    for pipeline_id, yaml_update in updates.items():
        url = f"{client.base_url}/pipeline/api/pipelines/v2/{pipeline_id}"
        params = {
            "accountIdentifier": client.account_id,
            "orgIdentifier": org_id,
            "projectIdentifier": project_id
        }
        response = requests.put(
            url,
            headers={**client.headers, "Content-Type": "application/yaml"},
            params=params,
            data=yaml_update
        )
        print(f"Updated {pipeline_id}: {response.status_code}")

Best Practices

Store credentials securely - Use environment variables or secret managers
Implement retry logic - Handle transient failures gracefully
Respect rate limits - Implement exponential backoff
Use pagination - Don't request all records at once
Validate inputs - Check identifiers before API calls
Log API calls - Maintain audit trail for debugging
Use service accounts - Don't use personal API keys in automation
Scope permissions - Use least-privilege API keys

Reference Links

Related Resources

Comprehensive API Reference: docs/harness/API.md
Platform Skill: skills/harness-platform/SKILL.md
CI Skill: skills/harness-ci/SKILL.md
MCP Integration: skills/harness-mcp/SKILL.md
Jira Sync Agent: agents/harness-jira-sync.md

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