{
  "mcpServers": {
    "graylog": {
      "command": "npx",
      "args": ["-y", "mcp-server-graylog@1.0.3"],
      "env": {
        "BASE_URL": "https://your-graylog-instance.example.com",
        "API_TOKEN": "your_graylog_api_token"
      }
    }
  }
}

To get your API token: Graylog Web UI > System > Users > Edit your user > Tokens > Create Token.

Verify

echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0.0"}}}' | BASE_URL=https://your-graylog.example.com API_TOKEN=your_token npx mcp-server-graylog@1.0.3

You should see a JSON response with protocolVersion and capabilities.

Overview

This skill provides 4 MCP tools for searching and monitoring Graylog:

Tool	Description
`search_logs_absolute`	Search logs between specific timestamps (ISO 8601)
`search_logs_relative`	Search recent logs (last N seconds, default: 15 min)
`list_streams`	Discover available application streams and their IDs
`get_system_info`	Check Graylog version, health, and processing status

Core Tasks

"Search for ERROR logs in the last 15 minutes"
"Find all 500 errors from the payment service between 2pm and 3pm today"
"List available Graylog streams so I can filter by application"
"Check if Graylog is healthy and processing logs"
"Search for timeout errors in the API stream from the last hour"

Environment Variable Contract

Variable	Required	Description
`BASE_URL`	Yes	Full URL to your Graylog instance (e.g., `https://graylog.example.com`)
`API_TOKEN`	Yes	Graylog API token for authentication (Basic Auth)

Query Syntax

Uses Elasticsearch query syntax:

level:ERROR - Filter by log level
source:api-server - Filter by source
"connection timeout" - Exact phrase match
status:>=500 - Numeric range
message:*exception* - Wildcard match
level:ERROR AND source:payment - Boolean operators

Security & Guardrails

Read-only access: No write operations to Graylog - only searches and listing
Credential isolation: API token stored in environment variables, never in code or logs
Request timeout: 30-second timeout prevents hanging requests
Result limits: Queries capped at 1000 messages maximum, 50 by default
Input validation: All parameters validated before API calls (query, timestamps, stream IDs, limits)
Error sanitization: Error messages never expose API tokens or sensitive internal details
Time range bounds: Relative searches limited to 24 hours maximum

Troubleshooting

Error	Solution
"Missing environment variables"	Set `BASE_URL` and `API_TOKEN` in your MCP config
"Authentication failed"	Verify your API token is valid in Graylog UI
"Cannot reach Graylog"	Check BASE_URL and network/VPN connectivity
"Invalid query"	Check Elasticsearch query syntax
"Endpoint not found"	Verify BASE_URL includes the correct Graylog URL (no trailing `/api`)

Release Notes

v1.0.3 (2026-04-08)

Extracted shared helpers for testable imports
Fixed credential leak in git history
54 tests passing, all MCP protocol verified

v1.0.0 (2025-10-23)

First stable release with 4 tools
Fixed 5 critical bugs from initial implementation
Comprehensive test suite and documentation

Publisher

@Pranavj17

graylog-log-search

Graylog Log Search Skill

Quick Start

Install

Configure