MCP Server for Splunk

A Go implementation of the MCP server for Splunk. Supports STDIO and SSE (Server-Sent Events HTTP API). Uses github.com/mark3labs/mcp-go SDK.

MCP Tools implemented

• list_splunk_saved_searches
  • Parameters:
    • count (number, optional): Number of results to return (max 100, default 100)
    • offset (number, optional): Offset for pagination (default 0)
• list_splunk_alerts
  • Parameters:
    • count (number, optional): Number of results to return (max 100, default 10)
    • offset (number, optional): Offset for pagination (default 0)
    • title (string, optional): Case-insensitive substring to filter alert titles
• list_splunk_fired_alerts
  • Parameters:
    • count (number, optional): Number of results to return (max 100, default 10)
    • offset (number, optional): Offset for pagination (default 0)
    • ss_name (string, optional): Search name pattern to filter alerts (default “*”)
    • earliest (string, optional): Time range to look back (default “-24h”)
• list_splunk_indexes
  • Parameters:
    • count (number, optional): Number of results to return (max 100, default 10)
    • offset (number, optional): Offset for pagination (default 0)
• list_splunk_macros
  • Parameters:
    • count (number, optional): Number of results to return (max 100, default 10)
    • offset (number, optional): Offset for pagination (default 0)

MCP Prompts and Resources

• internal/splunk/prompt.go implements an MCP Prompt to find Splunk alerts for a specific keyword (e.g. GitHub or OKTA) and instructs Cursor to utilise multiple MCP tools to review all Splunk alerts, indexes and macros first to provide the best answer.
• cmd/mcp/server/main.go implements MCP Resource in the form of local CSV file with Splunk related content, providing further context to the chat.

Usage

STDIO mode (default)

export SPLUNK_URL=https://your-splunk-instance:8089
export SPLUNK_TOKEN=your-splunk-token

# List available tools
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | go run cmd/mcp-server-splunk/main.go | jq

# Call list_splunk_saved_searches tool
echo '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"list_splunk_saved_searches","arguments":{}}}' | go run cmd/mcp-server-splunk/main.go | jq

SSE mode (Server-Sent Events HTTP API)

export SPLUNK_URL=https://your-splunk-instance:8089
export SPLUNK_TOKEN=your-splunk-token

# Start the server
go run cmd/mcp-server-splunk/main.go -transport sse -port 3001

# Call the server and get Session ID from the output. Do not terminate the session.
curl http://localhost:3001/sse

# Keep session running and and use different terminal window for the final MCP call
curl -X POST "http://localhost:3001/message?sessionId=YOUR_SESSION_ID" 
  -H "Content-Type: application/json" 
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | jq

Installing via Smithery

Dockerfile and smithery.yaml are used to support hosting this MCP server at [Smithery](https://smithery.ai/server/@jkosik/.

Local Docker build and run

docker build -t mcp-server-splunk .

echo '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}' | 
docker run --rm -i 
  -e SPLUNK_URL=https://your-splunk-instance:8089 
  -e SPLUNK_TOKEN=your-splunk-token 
  mcp-server-splunk | jq

Cursor integration

By configuring MCP Settings in Cursor, you can include remote data directly into the LLM context.

Integrate STDIO or SSE MCP Servers (see below) and use Cursor Chat. Cursor will automatically try to use MCP Tools, Prompts or Re Sample prompts:

• How many MCP tools for Splunk are available?
• How many Splunk indexes do we have?
• Can you list first 5 Splunk macros including underlying queries?
• How many alers with "Alert_CRITICAL" in the name were fired in the last day?
• Read the MCP Resource "Data Dictionary" and find the contact person for the Splunk index XYZ.

STDIO mode

Build the server:

go build -o cmd/mcp-server-splunk/mcp-server-splunk cmd/mcp-server-splunk/main.go

Update ~/.cursor/mcp.json

{
  "mcpServers": {
    "splunk_stdio": {
      "name": "Splunk MCP Server (STDIO)",
      "description": "MCP server for Splunk integration",
      "type": "stdio",
      "command": "/Users/juraj/data/github.com/jkosik/mcp-server-splunk/cmd/mcp-server-splunk/mcp-server-splunk",
      "env": {
        "SPLUNK_URL": "https://your-splunk-instance:8089",
        "SPLUNK_TOKEN": "your-splunk-token"
      }
    }
  }
}

SSE mode

Start the server:

export SPLUNK_URL=https://your-splunk-instance:8089
export SPLUNK_TOKEN=your-splunk-token

# Start the server
go run cmd/mcp-server-splunk/main.go -transport sse -port 3001

Update ~/.cursor/mcp.json

{
  "mcpServers": {
    "splunk_sse": {
      "name": "Splunk MCP Server (SSE)",
      "description": "MCP server for Splunk integration (SSE mode)",
      "type": "sse",
      "url": "http://localhost:3001/sse"
    }
  }
}