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Model Context Protocol

Anthropic's Model Context Protocol is a standard for connecting AI assistants to the systems where data lives, including content repositories, business tools, and development environments.

Website: modelcontextprotocol.io

Phoenix MCP Server

Connect to your Phoenix instance using MCP

MCP Tracing

Trace your MCP Clients and Servers in a unified view

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Phoenix MCP Server

Phoenix MCP Server is an implementation of the Model Context Protocol for the Arize Phoenix platform. It provides a unified interface to Phoenix's capabilites.

Phoenix MCP Server supports:

  • Prompts Management: Create, list, update, and iterate on prompts

  • Datasets: Explore datasets, and synthesize new examples

  • Experiments: Pull experiment results and visualize them with the help of an LLM

Connecting the Phoenix MCP Server

Via Cursor Deeplink:

Manually:

From the Cursor Settings page, navigate to the MCP section, and click "Add new global MCP server"

Add the following code to your MCP config file:

{
  "mcpServers": {
    "phoenix": {
      "command": "npx",
      "args": [
        "-y",
        "@arizeai/phoenix-mcp@latest",
        "--baseUrl",
        "https://my-phoenix.com",
        "--apiKey",
        "your-api-key"
      ]
    }
  }

Replacing:

  • https://my-phoenix.com with your Phoenix collector endpoint

  • your-api-key with your Phoenix API key

After saving your config file, you should see the Phoenix server enabled:

You can access Phoenix prompts, experiments, and datasets through Cursor!

From the Claude Desktop settings window, navigate to the Developer Section, and click "Edit Config"

Open your config file and add the following code:

{
  "mcpServers": {
    "phoenix": {
      "command": "npx",
      "args": [
        "-y",
        "@arizeai/phoenix-mcp@latest",
        "--baseUrl",
        "https://my-phoenix.com",
        "--apiKey",
        "your-api-key"
      ]
    }
  }

Replacing:

  • https://my-phoenix.com with your Phoenix collector endpoint

  • your-api-key with your Phoenix API key

Save your file and relaunch Claude Desktop. You should now see your new tools ready for use in Claude!

Add the following code to your MCP config file:

{
  "mcpServers": {
    "phoenix": {
      "command": "npx",
      "args": [
        "-y",
        "@arizeai/phoenix-mcp@latest",
        "--baseUrl",
        "https://my-phoenix.com",
        "--apiKey",
        "your-api-key"
      ]
    }
  }

Replacing:

  • https://my-phoenix.com with your Phoenix collector endpoint

  • your-api-key with your Phoenix API key

Using the Phoenix MCP Server

The MCP server can be used to interact with Prompts, Experiments, and Datasets. It can be used to retrieve information about each item, and can create and update Prompts.

Some good questions to try:

  1. What prompts do I have in Phoenix?

  2. Create a new prompt in Phoenix that classifies user intent

  3. Update my classification prompt in Phoenix with these new options

  4. Summarize the Phoenix experiments run on my agent inputs dataset

  5. Visualize the results of my jailbreak dataset experiments in Phoenix

Hoping to see additional functionality?

@arizeai/phoenix-mcp is open-source! Issues and PRs welcome.

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MCP Tracing

Phoenix provides tracing for MCP clients and servers through OpenInference. This includes the unique capability to trace client to server interactions under a single trace in the correct hierarchy.

The openinference-instrumentation-mcp instrumentor is unique compared to other OpenInference instrumentors. It does not generate any of its own telemetry. Instead, it enables context propagation between MCP clients and servers to unify traces. You still need generate OpenTelemetry traces in both the client and server to see a unified trace.

Install

pip install openinference-instrumentation-mcp

Because the MCP instrumentor does not generate its own telemetry, you must use it alongside other instrumentation code to see traces.

The example code below uses OpenAI agents, which you can instrument using:

pip install openinference-instrumentation-openai_agents

Add Tracing to your MCP Client

import asyncio

from agents import Agent, Runner
from agents.mcp import MCPServer, MCPServerStdio
from dotenv import load_dotenv

from phoenix.otel import register

load_dotenv()

# Connect to your Phoenix instance
tracer_provider = register(auto_instrument=True)


async def run(mcp_server: MCPServer):
    agent = Agent(
        name="Assistant",
        instructions="Use the tools to answer the users question.",
        mcp_servers=[mcp_server],
    )
    while True:
        message = input("\n\nEnter your question (or 'exit' to quit): ")
        if message.lower() == "exit" or message.lower() == "q":
            break
        print(f"\n\nRunning: {message}")
        result = await Runner.run(starting_agent=agent, input=message)
        print(result.final_output)


async def main():
    async with MCPServerStdio(
        name="Financial Analysis Server",
        params={
            "command": "fastmcp",
            "args": ["run", "./server.py"],
        },
        client_session_timeout_seconds=30,
    ) as server:
        await run(server)
        
if __name__ == "__main__":
    asyncio.run(main())

Add Tracing to your MCP Server

import json
import os
from datetime import datetime, timedelta

import openai
from dotenv import load_dotenv
from mcp.server.fastmcp import FastMCP
from pydantic import BaseModel

from phoenix.otel import register

load_dotenv()

# You must also connect your MCP server to Phoenix
tracer_provider = register(auto_instrument=True)

# Get a tracer to add additional instrumentattion
tracer = tracer_provider.get_tracer("financial-analysis-server")

# Configure OpenAI client
client = openai.OpenAI(api_key=os.environ.get("OPENAI_API_KEY"))
MODEL = "gpt-4-turbo"

# Create MCP server
mcp = FastMCP("Financial Analysis Server")


class StockAnalysisRequest(BaseModel):
    ticker: str
    time_period: str = "short-term"  # short-term, medium-term, long-term


@mcp.tool()
@tracer.tool(name="MCP.analyze_stock") # this OpenInference call adds tracing to this method
def analyze_stock(request: StockAnalysisRequest) -> dict:
    """Analyzes a stock based on its ticker symbol and provides investment recommendations."""

    # Make LLM API call to analyze the stock
    prompt = f"""
    Provide a detailed financial analysis for the stock ticker: {request.ticker}
    Time horizon: {request.time_period}

    Please include:
    1. Company overview
    2. Recent financial performance
    3. Key metrics (P/E ratio, market cap, etc.)
    4. Risk assessment
    5. Investment recommendation

    Format your response as a JSON object with the following structure:
    {{
        "ticker": "{request.ticker}",
        "company_name": "Full company name",
        "overview": "Brief company description",
        "financial_performance": "Analysis of recent performance",
        "key_metrics": {{
            "market_cap": "Value in billions",
            "pe_ratio": "Current P/E ratio",
            "dividend_yield": "Current yield percentage",
            "52_week_high": "Value",
            "52_week_low": "Value"
        }},
        "risk_assessment": "Analysis of risks",
        "recommendation": "Buy/Hold/Sell recommendation with explanation",
        "time_horizon": "{request.time_period}"
    }}
    """

    response = client.chat.completions.create(
        model=MODEL,
        messages=[{"role": "user", "content": prompt}],
        response_format={"type": "json_object"},
    )

    analysis = json.loads(response.choices[0].message.content)
    return analysis

# ... define any additional MCP tools you wish

if __name__ == "__main__":
    mcp.run()

Observe

Now that you have tracing setup, all invocations of your client and server will be streamed to Phoenix for observability and evaluation, and connected in the platform.

Resources

  • End to end example

  • OpenInference package

Sign up for Phoenix:

  1. Sign up for an Arize Phoenix account at https://app.phoenix.arize.com/login

  2. Click Create Space, then follow the prompts to create and launch your space.

Install packages:

pip install arize-phoenix-otel

Set your Phoenix endpoint and API Key:

From your new Phoenix Space

  1. Create your API key from the Settings page

  2. Copy your Hostname from the Settings page

  3. In your code, set your endpoint and API key:

import os

os.environ["PHOENIX_API_KEY"] = "ADD YOUR PHOENIX API KEY"
os.environ["PHOENIX_COLLECTOR_ENDPOINT"] = "ADD YOUR PHOENIX HOSTNAME"

# If you created your Phoenix Cloud instance before June 24th, 2025,
# you also need to set the API key as a header:
# os.environ["PHOENIX_CLIENT_HEADERS"] = f"api_key={os.getenv('PHOENIX_API_KEY')}"

Having trouble finding your endpoint? Check out Finding your Phoenix Endpoint

Launch your local Phoenix instance:

pip install arize-phoenix
phoenix serve

For details on customizing a local terminal deployment, see Terminal Setup.

Install packages:

pip install arize-phoenix-otel

Set your Phoenix endpoint:

import os

os.environ["PHOENIX_COLLECTOR_ENDPOINT"] = "http://localhost:6006"

See Terminal for more details.

Pull latest Phoenix image from Docker Hub:

docker pull arizephoenix/phoenix:latest

Run your containerized instance:

docker run -p 6006:6006 arizephoenix/phoenix:latest

This will expose the Phoenix on localhost:6006

Install packages:

pip install arize-phoenix-otel

Set your Phoenix endpoint:

import os

os.environ["PHOENIX_COLLECTOR_ENDPOINT"] = "http://localhost:6006"

For more info on using Phoenix with Docker, see Docker.

Install packages:

pip install arize-phoenix

Launch Phoenix:

import phoenix as px
px.launch_app()

By default, notebook instances do not have persistent storage, so your traces will disappear after the notebook is closed. See self-hosting or use one of the other deployment options to retain traces.