What is the key difference between Opik MCP and Spanlens?

Opik MCP belongs to the Monitoring category with local stdio execution, while Spanlens belongs to the Monitoring category with local stdio execution.

How do I install Opik MCP or Spanlens in Claude Desktop or Cursor?

Copy the mcpServers JSON configuration snippet provided on this page into your claude_desktop_config.json or ~/.cursor/mcp.json file and restart your AI client.

Are Opik MCP and Spanlens free or paid?

Opik MCP operates under a BYOK (Pay Provider Direct) model (API Key required). Spanlens operates under a Freemium model (API Key required).

Which MCP server has more tools and community activity?

Opik MCP lists 6 tools with 1 views and 217 GitHub stars. Spanlens lists 6 tools with 2 views and 12 GitHub stars.

Can I use both Opik MCP and Spanlens together in the same MCP host?

Yes! MCP hosts like Claude Desktop, Cursor, Windsurf, Cline, and VS Code support configuring multiple servers under the mcpServers object simultaneously.

Side-by-Side Model Context Protocol Comparison

Opik MCP vs Spanlens

In-depth architectural comparison of the Opik MCP 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.

At a Glance & Executive Verdict

Opik MCP

Monitoring · Local stdio

Quality: 63/100 (Good) | Auth: API Key required

Spanlens

Monitoring · Local stdio

Quality: 55/100 (Good) | Auth: API Key required

Verdict Summary: Choose Opik MCP if you need specialized Monitoring tools running via a local process. Choose Spanlens if your workspace requires Monitoring integration with local subprocess execution. Both servers can be configured concurrently in your client's mcpServers manifest.

Which MCP Server Should You Choose?

Choose Opik MCP when:

You need dedicated capabilities in the Monitoring domain.
You prefer local stdio subprocess transport architecture.
Your security boundary fits: API Key required (BYOK (Pay Provider Direct)).
You have access to required keys: OPIK_API_KEY, OPIK_WORKSPACE, COMET_WORKSPACE, COMET_URL_OVERRIDE, OPIK_URL, OPIK_MCP_ANALYTICS_SOURCE.
Primary tools included: read, list, ask_ollie.

Explore Opik MCP 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 (Freemium).
You have access to required keys: SPANLENS_API_KEY.
Primary tools included: Request logging with full prompt and response details, Cost tracking and spend forecasting, Agent tracing for multi-step LLM workflows.

Feature & Specification Comparison

Specification	Opik MCP Comet-ML Monitoring	Spanlens spanlens Monitoring
Summary	Use natural language to explore LLM observability, traces, and monitoring data captured by Opik.	Query Spanlens LLM observability from Claude Desktop, Cursor, or Continue: request logs, costs, agent traces, anomalies, and user analytics with a read-only API key.
Category & Scope	Monitoring

Tools & Capabilities Breakdown

Opik MCP Tools (6)

read

One tool for any "show me X" question. Takes an `entity_type` plus an `id`

list

Browse a collection with optional name filter and pagination. Project-scoped

ask_ollie

For investigative questions, cross-entity synthesis, or anything that needs

write

Universal write dispatcher. Pass `operation` + `data` and the dispatcher

schema

Inspect the exact JSON shape and required fields of any write operation before

run_experiment

Run an evaluation experiment end-to-end via Ollie. Takes a single

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).

Opik MCP Configuration

mcpServers (Claude Desktop / Cursor)

{
  "mcpServers": {
    "comet-ml-opik-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "opik-mcp"
      ],
      "env": {
        "OPIK_API_KEY": "YOUR_OPIK_API_KEY_HERE",
        "OPIK_WORKSPACE": "YOUR_OPIK_WORKSPACE_HERE",
        "COMET_WORKSPACE": "YOUR_COMET_WORKSPACE_HERE",
        "COMET_URL_OVERRIDE": "YOUR_COMET_URL_OVERRIDE_HERE",
        "OPIK_URL": "YOUR_OPIK_URL_HERE",
        "OPIK_MCP_ANALYTICS_SOURCE": "YOUR_OPIK_MCP_ANALYTICS_SOURCE_HERE"
      }
    }
  }
}

Spanlens Configuration

mcpServers (Claude Desktop / Cursor)

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

Frequently Asked Questions

Opik MCP is categorized under Monitoring and uses a local stdio subprocess. In contrast, Spanlens belongs to Monitoring using local stdio subprocess. Select Opik MCP when you need capabilities focused on monitoring and Spanlens when you require tools for monitoring.

More alternatives to Opik MCP More alternatives to Spanlens Monitoring category hub