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temporal-mcp-server

by enzomotta
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Hybrid

Temporal MCP Server

A Model Context Protocol (MCP) server that lets AI assistants observe and manage Temporal workflows. Built in Kotlin/JVM with a Node.js bridge for fast MCP initialization.

Prerequisites

  • JDK 17+

  • Node.js (for the MCP bridge)

  • Access to a Temporal server (local or Temporal Cloud)

Related MCP server: n8n Manager for AI Agents

Build

./gradlew shadowJar

The JAR is created at build/libs/temporal-mcp-server-1.0-SNAPSHOT.jar.

Configuration

The server is launched via minimal-mcp.js, which handles MCP protocol initialization and spawns the Java process.

MCP Client Configuration

{
  "mcpServers": {
    "temporal": {
      "command": "node",
      "args": [
        "path/to/minimal-mcp.js",
        "--namespace", "my-namespace",
        "--address", "my-host:7233"
      ],
      "env": {
        "TEMPORAL_API_KEY": "your-api-key"
      }
    }
  }
}

Command-Line Arguments

Argument

Required

Description

--namespace

Yes

Temporal namespace

--address

Yes

Temporal server address (e.g., my-ns.abc.tmprl.cloud:7233)

Environment Variables

Variable

Description

TEMPORAL_API_KEY

API key for Temporal Cloud authentication

TEMPORAL_CLIENT_CERT_PATH

Path to mTLS client certificate file

TEMPORAL_CLIENT_KEY_PATH

Path to mTLS client key file

TEMPORAL_CLIENT_CERT

mTLS client certificate content (alternative to path)

TEMPORAL_CLIENT_KEY

mTLS client key content (alternative to path)

Authentication

API Key (Temporal Cloud)

Set TEMPORAL_API_KEY in the env section of your MCP config. The key is sent as a Bearer token in gRPC metadata.

mTLS Certificates

For mTLS authentication, provide either file paths or content directly:

{
  "mcpServers": {
    "temporal": {
      "command": "node",
      "args": ["path/to/minimal-mcp.js", "--namespace", "my-ns", "--address", "my-host:7233"],
      "env": {
        "TEMPORAL_CLIENT_CERT_PATH": "/path/to/client.pem",
        "TEMPORAL_CLIENT_KEY_PATH": "/path/to/client.key"
      }
    }
  }
}

Tools

Workflow Observation

Tool

Description

list_workflows

Lists workflows in the namespace. Supports query filter and pageSize (1-1000, default 10).

get_workflow_status

Gets status of a specific workflow by workflowId (optional runId). Returns parentWorkflowId, parentRunId, taskQueue, closeTime, memo, and searchAttributes.

get_workflow_history

Retrieves the complete event history of a workflow with full event attributes.

query_workflow

Executes a query on a running workflow (workflowId, queryType, optional args).

Workflow Actions

Tool

Description

start_workflow

Starts a new workflow (workflowId, workflowType, taskQueue, optional args).

send_signal

Sends a signal to a running workflow (workflowId, signalName, optional signalArgs).

reset_workflow

Resets a workflow to a specific point in its history, creating a new run. Supports eventId or resetType: "last_workflow_task" to auto-detect the last WorkflowTaskCompleted event.

terminate_workflow

Terminates a running workflow (workflowId, optional reason).

Utilities

Tool

Description

wait_for_activity

Polls until a workflow reaches a specific activity (workflowId, activityName, optional timeoutSeconds 1-3600).

send_webhook

Sends an HTTP POST webhook (webhookUrl, payload, optional headers). Useful for completing async activities.

Development

Running Tests

./gradlew test

Architecture

minimal-mcp.js acts as a bridge: it responds immediately to the MCP initialize handshake, then spawns the Java process in the background. Once Java is ready, all subsequent requests are forwarded to it.

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