agent_engines: TypeError: cannot pickle '_contextvars.Context' object

Not specified by the original author.

TL;DR

Deploying an ADK agent to agentengines failing with "TypeError: cannot pickle 'contextvars.Context' object": the maintainer confirmed deployment works when you pass the full requirements to agentengines.create: remoteapp = agentengines.create(app, requirements=["google-cloud-aiplatform[agentengines,adk]", "google-adk"]).

TypeError: cannot pickle '_contextvars.Context' object

Steps

1. Deploying an ADK agent to agentengines failing with "TypeError: cannot pickle 'contextvars.Context' object": the maintainer confirmed deployment works when you pass the full requirements to agentengines.create: remoteapp = agentengines.create(app, requirements=["google-cloud-aiplatform[agentengines,adk]", "google-adk"]). The agent_engines extra on google-cloud-aiplatform is what pulls in the fixed serialization path.

When to use

You are seeing this: Issue google/adk-python#856 (closed, 18 comments): I'm encountering an error when trying to deploy an agent to agentengines. Use this skill when you run into "agentengines: TypeError: cannot pickle '_contextvars.Context' object".

When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.

Sources

• https://example.com/"
• https://github.com/google/adk-python/issues/856

In https://github.com/google/adk-python/issues/856, the reporter asked: Issue google/adk-python#856 (closed, 18 comments): I'm encountering an error when trying to deploy an agent to agentengines. The deployment fails with the following traceback: TypeError: cannot pickle 'contextvars.Context' object My code is: ```python from toolboxcore import ToolboxSyncClient from google.adk.agents import Agent from typing import Optional import requests import json import os toolbox = ToolboxSyncClient("https://example.com/") toolstoolbox = toolbox.loadtoolset('megatoy-bigquery-toolset') INSTRUCTION = """ You are "XXX," the primary AI assistant for MegaToy, a wholesale company specializing in home goods and general merchandise. The verified answer: Deploying an ADK agent to agentengines failing with "TypeError: cannot pickle 'contextvars.Context' object": the maintainer confirmed deployment works when you pass the full requirements to agentengines.create: remoteapp = agentengines.create(app, requirements=["google-cloud-aiplatform[agentengines,adk]", "google-adk"]). The agentengines extra on google-cloud-aiplatform is what pulls in the fixed serialization path. Source thread: https://github.com/google/adk-python/issues/856