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MergeAgentHandlerTool

The MergeAgentHandlerTool enables CrewAI agents to securely access third-party integrations through Merge’s Agent Handler platform. Agent Handler provides pre-built, secure connectors to popular tools like Linear, GitHub, Slack, Notion, and hundreds more—all with built-in authentication, permissions, and monitoring.

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Installation

uv pip install 'crewai[tools]'

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Requirements

  • Merge Agent Handler account with a configured Tool Pack
  • Agent Handler API key
  • At least one registered user linked to your Tool Pack
  • Third-party integrations configured in your Tool Pack

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Getting Started with Agent Handler

  1. Sign up for a Merge Agent Handler account at ah.merge.dev/signup
  2. Create a Tool Pack and configure the integrations you need
  3. Register users who will authenticate with the third-party services
  4. Get your API key from the Agent Handler dashboard
  5. Set environment variable: export AGENT_HANDLER_API_KEY='your-key-here'
  6. Start building with the MergeAgentHandlerTool in CrewAI

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Notes

  • Tool Pack IDs and Registered User IDs can be found in your Agent Handler dashboard or created via API
  • The tool uses the Model Context Protocol (MCP) for communication with Agent Handler
  • Session IDs are automatically generated but can be customized for context persistence
  • All tool calls are logged and auditable through the Agent Handler platform
  • Tool parameters are dynamically discovered from the Agent Handler API and validated automatically

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Usage

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Single Tool Usage

Here’s how to use a specific tool from your Tool Pack: 
from crewai import Agent, Task, Crew
from crewai_tools import MergeAgentHandlerTool

# Create a tool for Linear issue creation
linear_create_tool = MergeAgentHandlerTool.from_tool_name(
    tool_name="linear__create_issue",
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa"
)

# Create a CrewAI agent that uses the tool
project_manager = Agent(
    role='Project Manager',
    goal='Manage project tasks and issues efficiently',
    backstory='I am an expert at tracking project work and creating actionable tasks.',
    tools=[linear_create_tool],
    verbose=True
)

# Create a task for the agent
create_issue_task = Task(
    description="Create a new high-priority issue in Linear titled 'Implement user authentication' with a detailed description of the requirements.",
    agent=project_manager,
    expected_output="Confirmation that the issue was created with its ID"
)

# Create a crew with the agent
crew = Crew(
    agents=[project_manager],
    tasks=[create_issue_task],
    verbose=True
)

# Run the crew
result = crew.kickoff()
print(result)

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Loading Multiple Tools from a Tool Pack

You can load all available tools from your Tool Pack at once: 
from crewai import Agent, Task, Crew
from crewai_tools import MergeAgentHandlerTool

# Load all tools from the Tool Pack
tools = MergeAgentHandlerTool.from_tool_pack(
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa"
)

# Create an agent with access to all tools
automation_expert = Agent(
    role='Automation Expert',
    goal='Automate workflows across multiple platforms',
    backstory='I can work with any tool in the toolbox to get things done.',
    tools=tools,
    verbose=True
)

automation_task = Task(
    description="Check for any high-priority issues in Linear and post a summary to Slack.",
    agent=automation_expert
)

crew = Crew(
    agents=[automation_expert],
    tasks=[automation_task],
    verbose=True
)

result = crew.kickoff()

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Loading Specific Tools Only

Load only the tools you need: 
from crewai import Agent, Task, Crew
from crewai_tools import MergeAgentHandlerTool

# Load specific tools from the Tool Pack
selected_tools = MergeAgentHandlerTool.from_tool_pack(
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa",
    tool_names=["linear__create_issue", "linear__get_issues", "slack__post_message"]
)

developer_assistant = Agent(
    role='Developer Assistant',
    goal='Help developers track and communicate about their work',
    backstory='I help developers stay organized and keep the team informed.',
    tools=selected_tools,
    verbose=True
)

daily_update_task = Task(
    description="Get all issues assigned to the current user in Linear and post a summary to the #dev-updates Slack channel.",
    agent=developer_assistant
)

crew = Crew(
    agents=[developer_assistant],
    tasks=[daily_update_task],
    verbose=True
)

result = crew.kickoff()

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Tool Arguments

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from_tool_name() Method

ArgumentTypeRequiredDefaultDescription
tool_namestrYesNoneName of the specific tool to use (e.g., “linear__create_issue”)
tool_pack_idstrYesNoneUUID of your Agent Handler Tool Pack
registered_user_idstrYesNoneUUID or origin_id of the registered user
base_urlstrNo”https://ah-api.merge.dev”Base URL for Agent Handler API
session_idstrNoAuto-generatedMCP session ID for maintaining context

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from_tool_pack() Method

ArgumentTypeRequiredDefaultDescription
tool_pack_idstrYesNoneUUID of your Agent Handler Tool Pack
registered_user_idstrYesNoneUUID or origin_id of the registered user
tool_nameslist[str]NoNoneSpecific tool names to load. If None, loads all available tools
base_urlstrNo”https://ah-api.merge.dev”Base URL for Agent Handler API

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Environment Variables

AGENT_HANDLER_API_KEY=your_api_key_here  # Required for authentication

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Advanced Usage

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Multi-Agent Workflow with Different Tool Access

from crewai import Agent, Task, Crew, Process
from crewai_tools import MergeAgentHandlerTool

# Create specialized tools for different agents
github_tools = MergeAgentHandlerTool.from_tool_pack(
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa",
    tool_names=["github__create_pull_request", "github__get_pull_requests"]
)

linear_tools = MergeAgentHandlerTool.from_tool_pack(
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa",
    tool_names=["linear__create_issue", "linear__update_issue"]
)

slack_tool = MergeAgentHandlerTool.from_tool_name(
    tool_name="slack__post_message",
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa"
)

# Create specialized agents
code_reviewer = Agent(
    role='Code Reviewer',
    goal='Review pull requests and ensure code quality',
    backstory='I am an expert at reviewing code changes and providing constructive feedback.',
    tools=github_tools
)

task_manager = Agent(
    role='Task Manager',
    goal='Track and update project tasks based on code changes',
    backstory='I keep the project board up to date with the latest development progress.',
    tools=linear_tools
)

communicator = Agent(
    role='Team Communicator',
    goal='Keep the team informed about important updates',
    backstory='I make sure everyone knows what is happening in the project.',
    tools=[slack_tool]
)

# Create sequential tasks
review_task = Task(
    description="Review all open pull requests in the 'api-service' repository and identify any that need attention.",
    agent=code_reviewer,
    expected_output="List of pull requests that need review or have issues"
)

update_task = Task(
    description="Update Linear issues based on the pull request review findings. Mark completed PRs as done.",
    agent=task_manager,
    expected_output="Summary of updated Linear issues"
)

notify_task = Task(
    description="Post a summary of today's code review and task updates to the #engineering Slack channel.",
    agent=communicator,
    expected_output="Confirmation that the message was posted"
)

# Create a crew with sequential processing
crew = Crew(
    agents=[code_reviewer, task_manager, communicator],
    tasks=[review_task, update_task, notify_task],
    process=Process.sequential,
    verbose=True
)

result = crew.kickoff()

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Custom Session Management

Maintain context across multiple tool calls using session IDs: 
from crewai import Agent, Task, Crew
from crewai_tools import MergeAgentHandlerTool

# Create tools with the same session ID to maintain context
session_id = "project-sprint-planning-2024"

create_tool = MergeAgentHandlerTool(
    name="linear_create_issue",
    description="Creates a new issue in Linear",
    tool_name="linear__create_issue",
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa",
    session_id=session_id
)

update_tool = MergeAgentHandlerTool(
    name="linear_update_issue",
    description="Updates an existing issue in Linear",
    tool_name="linear__update_issue",
    tool_pack_id="134e0111-0f67-44f6-98f0-597000290bb3",
    registered_user_id="91b2b905-e866-40c8-8be2-efe53827a0aa",
    session_id=session_id
)

sprint_planner = Agent(
    role='Sprint Planner',
    goal='Plan and organize sprint tasks',
    backstory='I help teams plan effective sprints with well-defined tasks.',
    tools=[create_tool, update_tool],
    verbose=True
)

planning_task = Task(
    description="Create 5 sprint tasks for the authentication feature and set their priorities based on dependencies.",
    agent=sprint_planner
)

crew = Crew(
    agents=[sprint_planner],
    tasks=[planning_task],
    verbose=True
)

result = crew.kickoff()

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Use Cases

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Unified Integration Access

  • Access hundreds of third-party tools through a single unified API without managing multiple SDKs
  • Enable agents to work with Linear, GitHub, Slack, Notion, Jira, Asana, and more from one integration point
  • Reduce integration complexity by letting Agent Handler manage authentication and API versioning

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Secure Enterprise Workflows

  • Leverage built-in authentication and permission management for all third-party integrations
  • Maintain enterprise security standards with centralized access control and audit logging
  • Enable agents to access company tools without exposing API keys or credentials in code

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Cross-Platform Automation

  • Build workflows that span multiple platforms (e.g., create GitHub issues from Linear tasks, sync Notion pages to Slack)
  • Enable seamless data flow between different tools in your tech stack
  • Create intelligent automation that understands context across different platforms

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Dynamic Tool Discovery

  • Load all available tools at runtime without hardcoding integration logic
  • Enable agents to discover and use new tools as they’re added to your Tool Pack
  • Build flexible agents that can adapt to changing tool availability

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User-Specific Tool Access

  • Different users can have different tool permissions and access levels
  • Enable multi-tenant workflows where agents act on behalf of specific users
  • Maintain proper attribution and permissions for all tool actions

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Available Integrations

Merge Agent Handler supports hundreds of integrations across multiple categories:
  • Project Management: Linear, Jira, Asana, Monday.com, ClickUp
  • Code Management: GitHub, GitLab, Bitbucket
  • Communication: Slack, Microsoft Teams, Discord
  • Documentation: Notion, Confluence, Google Docs
  • CRM: Salesforce, HubSpot, Pipedrive
  • And many more…
Visit the Merge Agent Handler documentation for a complete list of available integrations.

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Error Handling

The tool provides comprehensive error handling:
  • Authentication Errors: Invalid or missing API keys
  • Permission Errors: User lacks permission for the requested action
  • API Errors: Issues communicating with Agent Handler or third-party services
  • Validation Errors: Invalid parameters passed to tool methods
All errors are wrapped in MergeAgentHandlerToolError for consistent error handling.