Server start events (#635)

1. Refactored the core usage logic from `arcade_cli` to `arcade_core`
2. Add "MCP server started" event

As always, opt out by setting `ARCADE_USAGE_TRACKING` to 0.

libs/arcade-cli/arcade_cli/authn.py

@@ -5,11 +5,13 @@ from typing import Any
 from urllib.parse import parse_qs
 
 import yaml
+from arcade_core.constants import (
+    ARCADE_CONFIG_PATH,
+    CREDENTIALS_FILE_PATH,
+)
 from rich.console import Console
 
 from arcade_cli.constants import (
-    ARCADE_CONFIG_PATH,
-    CREDENTIALS_FILE_PATH,
     LOGIN_FAILED_HTML,
     LOGIN_SUCCESS_HTML,
 )

libs/arcade-cli/arcade_cli/constants.py

@@ -1,19 +1,8 @@
-import os
-
 PROD_CLOUD_HOST = "cloud.arcade.dev"
 PROD_ENGINE_HOST = "api.arcade.dev"
 LOCALHOST = "localhost"
 LOCAL_AUTH_CALLBACK_PORT = 9905
 
-# The path to the directory containing the Arcade configuration files. Typically ~/.arcade
-ARCADE_CONFIG_PATH = os.path.join(os.path.expanduser(os.getenv("ARCADE_WORK_DIR", "~")), ".arcade")
-
-# The path to the file containing the user's Arcade-related credentials (e.g., ARCADE_API_KEY).
-CREDENTIALS_FILE_PATH = os.path.join(ARCADE_CONFIG_PATH, "credentials.yaml")
-
-# The path to the file containing usage analytics identity data.
-USAGE_FILE_PATH = os.path.join(ARCADE_CONFIG_PATH, "usage.json")
-
 _style_block = b"""
 <link rel="icon" href="https://cdn.arcade.dev/favicons/favicon.ico" sizes="any">
 <link rel="apple-touch-icon" href="https://cdn.arcade.dev/favicons/apple-touch-icon.png">

libs/arcade-cli/arcade_cli/main.py

@@ -10,6 +10,7 @@ from typing import Optional
 
 import click
 import typer
+from arcade_core.constants import CREDENTIALS_FILE_PATH
 from arcadepy import Arcade
 from rich.console import Console
 from rich.text import Text
@@ -19,7 +20,6 @@ import arcade_cli.secret as secret
 import arcade_cli.worker as worker
 from arcade_cli.authn import LocalAuthCallbackServer, check_existing_login
 from arcade_cli.constants import (
-    CREDENTIALS_FILE_PATH,
     PROD_CLOUD_HOST,
     PROD_ENGINE_HOST,
 )

libs/arcade-cli/arcade_cli/usage/command_tracker.py

@@ -7,12 +7,15 @@ from importlib import metadata
 from typing import Any
 
 import typer
-from arcade_cli.constants import ARCADE_CONFIG_PATH
 from arcade_cli.usage.constants import (
     EVENT_CLI_COMMAND_EXECUTED,
     EVENT_CLI_COMMAND_FAILED,
     PROP_CLI_VERSION,
     PROP_COMMAND_NAME,
+)
+from arcade_core.constants import ARCADE_CONFIG_PATH
+from arcade_core.usage import UsageIdentity, UsageService, is_tracking_enabled
+from arcade_core.usage.constants import (
     PROP_DEVICE_MONOTONIC_END,
     PROP_DEVICE_MONOTONIC_START,
     PROP_DURATION_MS,
@@ -22,9 +25,6 @@ from arcade_cli.usage.constants import (
     PROP_RUNTIME_LANGUAGE,
     PROP_RUNTIME_VERSION,
 )
-from arcade_cli.usage.identity import UsageIdentity
-from arcade_cli.usage.usage_service import UsageService
-from arcade_cli.usage.utils import is_tracking_enabled
 from rich.console import Console
 from typer.core import TyperCommand, TyperGroup
 from typer.models import Context

libs/arcade-cli/arcade_cli/usage/constants.py

@@ -1,41 +1,7 @@
-"""Constants for usage tracking and analytics."""
+# CLI Specific Event Names
-
-# Event Names
 EVENT_CLI_COMMAND_EXECUTED = "CLI execution succeeded"
 EVENT_CLI_COMMAND_FAILED = "CLI execution failed"
 
-# Property Names
+# CLI Specific Property Names
 PROP_COMMAND_NAME = "command_name"
 PROP_CLI_VERSION = "cli_version"
-PROP_RUNTIME_LANGUAGE = "runtime_language"
-PROP_RUNTIME_VERSION = "runtime_version"
-PROP_OS_TYPE = "os_type"
-PROP_OS_RELEASE = "os_release"
-PROP_DURATION_MS = "duration_ms"
-PROP_ERROR_MESSAGE = "error_message"
-PROP_DEVICE_MONOTONIC_START = "device_start_timestamp"
-PROP_DEVICE_MONOTONIC_END = "device_end_timestamp"
-# Only used for anonymous usage
-PROP_PROCESS_PERSON_PROFILE = "$process_person_profile"
-
-# Identity Keys
-KEY_ANON_ID = "anon_id"
-KEY_LINKED_PRINCIPAL_ID = "linked_principal_id"
-
-# File Names
-USAGE_FILE_NAME = "usage.json"
-
-# Environment Variables
-# how props are passed to the usage tracking subprocess
-ARCADE_USAGE_EVENT_DATA = "ARCADE_USAGE_EVENT_DATA"
-# whether usage tracking is enabled. 1 is enabled, 0 is disabled.
-ARCADE_USAGE_TRACKING = "ARCADE_USAGE_TRACKING"
-
-# Timeouts and Limits (in seconds)
-TIMEOUT_POSTHOG_ALIAS = 2
-TIMEOUT_POSTHOG_CAPTURE = 5
-TIMEOUT_ARCADE_API = 2.0
-TIMEOUT_SUBPROCESS_EXIT = 10.0
-
-# Retry Configuration
-MAX_RETRIES_POSTHOG = 1

libs/arcade-core/arcade_core/constants.py

@@ -0,0 +1,6 @@
+import os
+
+# The path to the directory containing the Arcade configuration files. Typically ~/.arcade
+ARCADE_CONFIG_PATH = os.path.join(os.path.expanduser(os.getenv("ARCADE_WORK_DIR", "~")), ".arcade")
+# The path to the file containing the user's Arcade-related credentials (e.g., ARCADE_API_KEY).
+CREDENTIALS_FILE_PATH = os.path.join(ARCADE_CONFIG_PATH, "credentials.yaml")

libs/arcade-core/arcade_core/usage/__init__.py

@@ -0,0 +1,5 @@
+from arcade_core.usage.identity import UsageIdentity
+from arcade_core.usage.usage_service import UsageService
+from arcade_core.usage.utils import is_tracking_enabled
+
+__all__ = ["UsageIdentity", "UsageService", "is_tracking_enabled"]

libs/arcade-core/arcade_core/usage/__main__.py

@@ -1,6 +1,6 @@
 """Entry point for detached usage tracking subprocess.
 
-This module is invoked as `python -m arcade_cli.usage` and expects
+This module is invoked as `python -m arcade_core.usage` and expects
 event data to be passed via the ARCADE_USAGE_EVENT_DATA environment variable.
 """
 
@@ -8,14 +8,15 @@ import json
 import os
 import threading
 
-from arcade_cli.usage.constants import (
+from posthog import Posthog
+
+from arcade_core.usage.constants import (
     ARCADE_USAGE_EVENT_DATA,
     MAX_RETRIES_POSTHOG,
     PROP_PROCESS_PERSON_PROFILE,
     TIMEOUT_POSTHOG_CAPTURE,
     TIMEOUT_SUBPROCESS_EXIT,
 )
-from posthog import Posthog
 
 
 def _timeout_exit() -> None:

libs/arcade-core/arcade_core/usage/constants.py

@@ -0,0 +1,34 @@
+# Base (common) Property Names
+PROP_RUNTIME_LANGUAGE = "runtime_language"
+PROP_RUNTIME_VERSION = "runtime_version"
+PROP_OS_TYPE = "os_type"
+PROP_OS_RELEASE = "os_release"
+PROP_DURATION_MS = "duration_ms"
+PROP_ERROR_MESSAGE = "error_message"
+PROP_DEVICE_MONOTONIC_START = "device_start_timestamp"
+PROP_DEVICE_MONOTONIC_END = "device_end_timestamp"
+PROP_DEVICE_TIMESTAMP = "device_timestamp"
+# Only used for anonymous usage
+PROP_PROCESS_PERSON_PROFILE = "$process_person_profile"
+
+# Identity Keys
+KEY_ANON_ID = "anon_id"
+KEY_LINKED_PRINCIPAL_ID = "linked_principal_id"
+
+# File Names
+USAGE_FILE_NAME = "usage.json"
+
+# Environment Variables
+# how props are passed to the usage tracking subprocess
+ARCADE_USAGE_EVENT_DATA = "ARCADE_USAGE_EVENT_DATA"
+# whether usage tracking is enabled. 1 is enabled, 0 is disabled.
+ARCADE_USAGE_TRACKING = "ARCADE_USAGE_TRACKING"
+
+# Timeouts and Limits (in seconds)
+TIMEOUT_POSTHOG_ALIAS = 2
+TIMEOUT_POSTHOG_CAPTURE = 5
+TIMEOUT_ARCADE_API = 2.0
+TIMEOUT_SUBPROCESS_EXIT = 10.0
+
+# Retry Configuration
+MAX_RETRIES_POSTHOG = 1

libs/arcade-core/arcade_core/usage/identity.py

@@ -15,8 +15,9 @@ from typing import Any
 
 import httpx
 import yaml
-from arcade_cli.constants import ARCADE_CONFIG_PATH, CREDENTIALS_FILE_PATH
+
-from arcade_cli.usage.constants import (
+from arcade_core.constants import ARCADE_CONFIG_PATH, CREDENTIALS_FILE_PATH
+from arcade_core.usage.constants import (
     KEY_ANON_ID,
     KEY_LINKED_PRINCIPAL_ID,
     TIMEOUT_ARCADE_API,

libs/arcade-core/arcade_core/usage/usage_service.py

@@ -3,17 +3,17 @@ import os
 import subprocess
 import sys
 
-from arcade_cli.usage.constants import (
+from arcade_core.usage.constants import (
     ARCADE_USAGE_EVENT_DATA,
     MAX_RETRIES_POSTHOG,
     TIMEOUT_POSTHOG_ALIAS,
 )
-from arcade_cli.usage.utils import is_tracking_enabled
+from arcade_core.usage.utils import is_tracking_enabled
 
 
 class UsageService:
     def __init__(self) -> None:
-        self.api_key = "phc_hIqUQyJpf2TP4COePO5jEpkGeUXipa7KqTEyDeRsTmB"
+        self.api_key = "phc_g7OuFqZEAVwIgRdtnZkjvBpy9weQ1f9VJW6YP1SzQRF"
         self.host = "https://us.i.posthog.com"
 
     def alias(self, previous_id: str, distinct_id: str) -> None:
@@ -71,7 +71,7 @@ class UsageService:
             "is_anon": is_anon,
         })
 
-        cmd = [sys.executable, "-m", "arcade_cli.usage"]
+        cmd = [sys.executable, "-m", "arcade_core.usage"]
 
         # Pass data via environment variable (works on all platforms)
         env = os.environ.copy()

libs/arcade-core/arcade_core/usage/utils.py

@@ -1,6 +1,6 @@
 import os
 
-from arcade_cli.usage.constants import ARCADE_USAGE_TRACKING
+from arcade_core.usage.constants import ARCADE_USAGE_TRACKING
 
 
 def is_tracking_enabled() -> bool:

libs/arcade-mcp-server/README.md

@@ -67,6 +67,29 @@ python -m arcade_mcp_server --host 0.0.0.0 --port 8080
 - [Discord Community](https://discord.gg/arcade-mcp)
 - [Documentation](https://docs.arcade.dev)
 
+## Analytics & Privacy
+
+*Arcade MCP Server* collects anonymous usage data to help us improve the service and debug issues. We track "MCP server start" events to understand server usage patterns and reliability.
+
+#### What We Track
+
+When the server starts, we collect the following information:
+- **Server configuration**: transport type (`http` or `stdio`), host, port
+- **Server metadata**: tool count, server version
+- **Runtime environment**: Python version, OS type and release
+- **Timing**: device timestamp
+- **Errors**: error messages (if startup fails)
+
+#### Privacy
+
+- For **anonymous users**: Events are tracked with an anonymous ID and no user profile is created
+- For **authenticated users**: Events are linked to your account to help us provide better support
+- **No sensitive data** (credentials, tool inputs/outputs, or personal information) is ever collected
+
+#### Opt Out
+
+To disable usage tracking, set the environment variable ARCADE_USAGE_TRACKING to 0.
+
 ## License
 
 Arcade MCP Server is open source software licensed under the MIT license.

libs/arcade-mcp-server/arcade_mcp_server/mcp_app.py

@@ -26,6 +26,7 @@ from arcade_mcp_server.exceptions import ServerError
 from arcade_mcp_server.server import MCPServer
 from arcade_mcp_server.settings import MCPSettings, ServerSettings
 from arcade_mcp_server.types import Prompt, PromptMessage, Resource
+from arcade_mcp_server.usage import ServerTracker
 from arcade_mcp_server.worker import create_arcade_mcp
 
 P = ParamSpec("P")
@@ -249,6 +250,13 @@ class MCPApp:
         elif transport == "stdio":
             from arcade_mcp_server.__main__ import run_stdio_server
 
+            tracker = ServerTracker()
+            tracker.track_server_start(
+                transport="stdio",
+                host=None,
+                port=None,
+                tool_count=len(self._catalog),
+            )
             asyncio.run(
                 run_stdio_server(
                     catalog=self._catalog,
@@ -328,6 +336,13 @@ class MCPApp:
             **self.server_kwargs,
         )
 
+        tracker = ServerTracker()
+        tracker.track_server_start(
+            transport="http",
+            host=host,
+            port=port,
+            tool_count=len(self._catalog),
+        )
         uvicorn.run(
             app,
             host=host,

libs/arcade-mcp-server/arcade_mcp_server/usage/__init__.py

@@ -0,0 +1,3 @@
+from arcade_mcp_server.usage.server_tracker import ServerTracker
+
+__all__ = ["ServerTracker"]

libs/arcade-mcp-server/arcade_mcp_server/usage/constants.py

@@ -0,0 +1,9 @@
+# MCP Server Specific Event Names
+EVENT_MCP_SERVER_STARTED = "MCP server started"
+
+# MCP Server Specific Property Names
+PROP_TRANSPORT = "transport"
+PROP_HOST = "host"
+PROP_PORT = "port"
+PROP_TOOL_COUNT = "tool_count"
+PROP_MCP_SERVER_VERSION = "arcade_mcp_server_version"

libs/arcade-mcp-server/arcade_mcp_server/usage/server_tracker.py

@@ -0,0 +1,109 @@
+import platform
+import sys
+import time
+from importlib import metadata
+
+from arcade_core.usage import UsageIdentity, UsageService, is_tracking_enabled
+from arcade_core.usage.constants import (
+    PROP_DEVICE_TIMESTAMP,
+    PROP_OS_RELEASE,
+    PROP_OS_TYPE,
+    PROP_RUNTIME_LANGUAGE,
+    PROP_RUNTIME_VERSION,
+)
+
+from arcade_mcp_server.usage.constants import (
+    EVENT_MCP_SERVER_STARTED,
+    PROP_HOST,
+    PROP_MCP_SERVER_VERSION,
+    PROP_PORT,
+    PROP_TOOL_COUNT,
+    PROP_TRANSPORT,
+)
+
+
+class ServerTracker:
+    """Tracks MCP server events for usage analytics.
+
+    To opt out, set the ARCADE_USAGE_TRACKING environment variable to 0.
+    """
+
+    def __init__(self) -> None:
+        self.usage_service = UsageService()
+        self.identity = UsageIdentity()
+        self._mcp_server_version: str | None = None
+        self._runtime_version: str | None = None
+
+    @property
+    def mcp_server_version(self) -> str:
+        """Get the version of arcade_mcp_server package"""
+        if self._mcp_server_version is None:
+            try:
+                self._mcp_server_version = metadata.version("arcade-mcp-server")
+            except Exception:
+                self._mcp_server_version = "unknown"
+        return self._mcp_server_version
+
+    @property
+    def runtime_version(self) -> str:
+        """Get the version of the Python runtime"""
+        if self._runtime_version is None:
+            version_info = sys.version_info
+            self._runtime_version = (
+                f"{version_info.major}.{version_info.minor}.{version_info.micro}"
+            )
+        return self._runtime_version
+
+    @property
+    def user_id(self) -> str:
+        """Get the distinct_id based on developer's authentication state"""
+        return self.identity.get_distinct_id()
+
+    def track_server_start(
+        self,
+        transport: str,
+        host: str | None,
+        port: int | None,
+        tool_count: int,
+    ) -> None:
+        """Track MCP server start event.
+
+        Args:
+            transport: The transport type ("http" or "stdio")
+            host: The host address (None for stdio)
+            port: The port number (None for stdio)
+            tool_count: The number of tools available at server start
+        """
+        if not is_tracking_enabled():
+            return
+
+        # Check if aliasing needed (user authenticated but not yet linked)
+        if self.identity.should_alias():
+            principal_id = self.identity.get_principal_id()
+            if principal_id:
+                self.usage_service.alias(
+                    previous_id=self.identity.anon_id, distinct_id=principal_id
+                )
+                self.identity.set_linked_principal_id(principal_id)
+
+        properties: dict[str, str | int | float] = {
+            PROP_TRANSPORT: transport,
+            PROP_TOOL_COUNT: tool_count,
+            PROP_MCP_SERVER_VERSION: self.mcp_server_version,
+            PROP_RUNTIME_LANGUAGE: "python",
+            PROP_RUNTIME_VERSION: self.runtime_version,
+            PROP_OS_TYPE: platform.system(),
+            PROP_OS_RELEASE: platform.release(),
+            PROP_DEVICE_TIMESTAMP: time.monotonic(),
+        }
+
+        # HTTP Streamable specific props
+        if host is not None:
+            properties[PROP_HOST] = host
+        if port is not None:
+            properties[PROP_PORT] = port
+
+        is_anon = self.user_id == self.identity.anon_id
+        self.usage_service.capture(
+            EVENT_MCP_SERVER_STARTED, self.user_id, properties=properties, is_anon=is_anon
+        )

libs/tests/cli/usage/test_identity.py

@@ -5,7 +5,7 @@ from unittest.mock import MagicMock, patch
 
 import pytest
 import yaml
-from arcade_cli.usage.identity import UsageIdentity
+from arcade_core.usage import UsageIdentity
 
 
 @pytest.fixture
@@ -15,8 +15,8 @@ def temp_config_path(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
     config_dir.mkdir()
     credentials_file = config_dir / "credentials.yaml"
 
-    monkeypatch.setattr("arcade_cli.usage.identity.ARCADE_CONFIG_PATH", str(config_dir))
+    monkeypatch.setattr("arcade_core.usage.identity.ARCADE_CONFIG_PATH", str(config_dir))
-    monkeypatch.setattr("arcade_cli.usage.identity.CREDENTIALS_FILE_PATH", str(credentials_file))
+    monkeypatch.setattr("arcade_core.usage.identity.CREDENTIALS_FILE_PATH", str(credentials_file))
 
     return config_dir
 
@@ -154,7 +154,7 @@ class TestGetDistinctId:
 
         assert distinct_id == "persisted-user-123"
 
-    @patch("arcade_cli.usage.identity.UsageIdentity.get_principal_id")
+    @patch("arcade_core.usage.identity.UsageIdentity.get_principal_id")
     def test_returns_principal_id_from_api_when_not_persisted(
         self, mock_get_principal: MagicMock, identity: UsageIdentity
     ) -> None:
@@ -166,7 +166,7 @@ class TestGetDistinctId:
         assert distinct_id == "api-user-456"
         mock_get_principal.assert_called_once()
 
-    @patch("arcade_cli.usage.identity.UsageIdentity.get_principal_id")
+    @patch("arcade_core.usage.identity.UsageIdentity.get_principal_id")
     def test_returns_anon_id_when_not_authenticated(
         self, mock_get_principal: MagicMock, identity: UsageIdentity
     ) -> None:
@@ -257,7 +257,7 @@ class TestGetPrincipalId:
 class TestShouldAlias:
     """Tests for should_alias() method."""
 
-    @patch("arcade_cli.usage.identity.UsageIdentity.get_principal_id")
+    @patch("arcade_core.usage.identity.UsageIdentity.get_principal_id")
     def test_returns_true_when_authenticated_but_not_linked(
         self, mock_get_principal: MagicMock, identity: UsageIdentity
     ) -> None:
@@ -268,7 +268,7 @@ class TestShouldAlias:
 
         assert should_alias is True
 
-    @patch("arcade_cli.usage.identity.UsageIdentity.get_principal_id")
+    @patch("arcade_core.usage.identity.UsageIdentity.get_principal_id")
     def test_returns_false_when_already_linked(
         self, mock_get_principal: MagicMock, identity: UsageIdentity, temp_config_path: Path
     ) -> None:
@@ -285,7 +285,7 @@ class TestShouldAlias:
 
         assert should_alias is False
 
-    @patch("arcade_cli.usage.identity.UsageIdentity.get_principal_id")
+    @patch("arcade_core.usage.identity.UsageIdentity.get_principal_id")
     def test_returns_false_when_not_authenticated(
         self, mock_get_principal: MagicMock, identity: UsageIdentity
     ) -> None:

libs/tests/core/usage/test_cache_utils.py

@@ -1,5 +1,5 @@
 import pytest
-from arcade_cli.usage.utils import is_tracking_enabled
+from arcade_core.usage import is_tracking_enabled
 
 
 @pytest.mark.parametrize(