Spanlens

@spanlens

About Spanlens

Open source LLM observability and monitoring. Drop-in proxy for OpenAI, Anthropic, and Gemini with request logging, cost tracking, and agent tracing. Self-host with one Docker command. MIT.

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "Spanlens": {
      "command": "npx",
      "args": [
        "@spanlens/cli",
        "init"
      ]
    }
  }
}

Tools

No tools detected

Fetch the live tool list by running this server in a temporary sandbox using the button above.

Overview

What is Spanlens?

Open source LLM observability and monitoring. Drop-in proxy for OpenAI, Anthropic, and Gemini with request logging, cost tracking, and agent tracing. Self-host with one Docker command. MIT.

How to use Spanlens?

The README includes setup instructions such as npx @spanlens/cli init.

Key features of Spanlens

Helicone was acquired and its roadmap is uncertain
Langfuse is powerful but complex to set up and expensive to scale
The audit log (Settings → Audit log) records every membership / role / invitation event with actor + timestamp
Dashboard: http://localhost:3000
API / proxy: http://localhost:3001

Use cases of Spanlens

Connect an MCP-compatible client to this repository's service.
Review the README-backed setup before enabling it in production.

FAQ from Spanlens

Where is the source code for Spanlens?

The source code is linked from the repository URL on this page.

Does Spanlens include a standard MCP config?

If the README contains a parseable MCP configuration block, it is shown in the Config tab.

Frequently asked questions

Where is the source code for Spanlens?

The source code is linked from the repository URL on this page.

Does Spanlens include a standard MCP config?

If the README contains a parseable MCP configuration block, it is shown in the Config tab.

Comments

Basic information

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