MCP Server Logs Sieve vs Spanlens

In-depth architectural comparison of the MCP Server Logs Sieve and Spanlens MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose MCP Server Logs Sieve when:

• You need dedicated capabilities in the Monitoring domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (Free / Open Source).
• Primary tools included: Query logs with natural-language filters, Summarize logs over a selected period, Trace requests by trace ID.

Explore MCP Server Logs Sieve Details

Choose Spanlens when:

• You need dedicated capabilities in the Monitoring domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: API Key required (Free / Open Source).
• You have access to required keys: SPANLENS_API_KEY.
• Primary tools included: Seven read-only observability tools, Request log queries, Agent trace inspection.

Feature & Specification Comparison

Specification	MCP Server Logs Sieve Oluwatunmise-olat Monitoring	Spanlens spanlens Monitoring
Summary	Query, summarize, and trace logs in plain English across GCP Cloud Logging, AWS CloudWatch, Azure Log Analytics, Grafana Loki, and Elasticsearch	Query your Spanlens LLM observability from any MCP client. 7 read tools for request logs, agent traces, cost stats, anomalies, model-savings, and per-user analytics across OpenAI, Anthropic, and Gemini. Open source, self-hostable. npx -y @spanlens/mcp-server
Category & Scope

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "oluwatunmise-olat-mcp-server-logs-sieve": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-server-logs-sieve@latest"
      ]
    }
  }
}

{
  "mcpServers": {
    "spanlens-spanlens-2": {
      "command": "npx",
      "args": [
        "-y",
        "@spanlens/cli"
      ],
      "env": {
        "SPANLENS_API_KEY": "YOUR_SPANLENS_API_KEY_HERE"
      }
    }
  }
}

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