How do I install the spanlens mcp server?

Use a recorded configuration for your client, replace example credential values and paths, and verify the documented runtime. Restart or reconnect the client, then inspect the available tools.

What credentials does it need?

It reads `SPANLENS_API_KEY`, `RESEND_API_KEY`, `NEXT_PUBLIC_SUPABASE_URL`, `NEXT_PUBLIC_SUPABASE_ANON_KEY`, `SUPABASE_URL`, `SUPABASE_ANON_KEY`, `SUPABASE_SERVICE_ROLE_KEY`, `ENCRYPTION_KEY` from the environment. Store these in your client's env block or a secrets manager — never commit them to a repository — and grant the narrowest scope that still covers your use case.

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Spanlens MCP Server

Spanlens SDK for Python. Agent tracing, LLM usage capture, and cost observability.

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What is the Spanlens MCP Server?

Spanlens SDK for Python. Agent tracing, LLM usage capture, and cost observability.

The short version

Installs @spanlens/sdk with your package manager (npm / pnpm / yarn / bun) 2. Writes SPANLENS_API_KEY to .env.local 3. Rewrites every new OpenAI({ apiKey, baseURL }) into createOpenAI()

Helicone — was acquired and its roadmap is uncertain
Langfuse — is powerful but complex to set up and expensive to scale

More MCP options

Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.

Maintainer setup documentation.

How to install the Spanlens MCP Server

{
  "mcpServers": {
    "spanlens": {
      "command": "npx",
      "args": ["-y", "@spanlens/cli"],
      "env": {
        "SPANLENS_API_KEY": "your-value",
        "RESEND_API_KEY": "your-value",
        "NEXT_PUBLIC_SUPABASE_URL": "your-value",
        "NEXT_PUBLIC_SUPABASE_ANON_KEY": "your-value",
        "SUPABASE_URL": "your-value",
        "SUPABASE_ANON_KEY": "your-value",
        "SUPABASE_SERVICE_ROLE_KEY": "your-value",
        "ENCRYPTION_KEY": "your-value"
      }
    }
  }
}

Add to claude_desktop_config.json, then restart Claude Desktop.

Configuration

Variable	Description	Required
SPANLENS_API_KEY	Credential the server authenticates with.	Yes
RESEND_API_KEY	Credential the server authenticates with.	Yes
NEXT_PUBLIC_SUPABASE_URL	Endpoint or connection string the server talks to.	Yes
NEXT_PUBLIC_SUPABASE_ANON_KEY	Credential the server authenticates with.	Yes
SUPABASE_URL	Endpoint or connection string the server talks to.	Yes
SUPABASE_ANON_KEY	Credential the server authenticates with.	Yes
SUPABASE_SERVICE_ROLE_KEY	Credential the server authenticates with.	Yes
ENCRYPTION_KEY	Credential the server authenticates with.	Yes

Frequently asked questions

Spanlens SDK for Python. Agent tracing, LLM usage capture, and cost observability. Confirm the tools offered by your installed version in the connected client. Tool availability and permissions depend on the server and account configuration.

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