python/google-adk the sample is not working on agents playground

[TarunReddy-msft]

Description

• Attempted to run the Google ADK Python sample agent and test it using Agent Playground.

• The agent loads correctly in the Playground interface and accepts user input.

• However, after sending a message, the agent does not return any response.

• The chat UI works as expected:

  • Input box accepts messages
  • Messages appear in the conversation

• But the agent never generates or displays a reply.

• This appears to be related to the runtime execution of the Python sample agent, rather than the Agent Playground interface itself.

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Expected Behavior

• After sending a message in Agent Playground (e.g., "Hi"), the agent should process the input and return a response.

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Actual Behavior

• The message is accepted in the Playground interface.
• No response is generated or displayed from the agent.

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Environment

• Runtime: Python
• OS: Windows 11
• Interface: Agent Playground

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Steps to Reproduce

• Clone the Google ADK repository.
• Navigate to the Python sample agent.
• Create and activate a Python virtual environment.
• Install the required dependencies.
• Start the agent locally.
• Open Agent Playground.
• Select the Python sample agent.
• Send a message such as "Hi".

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Logs / Error Output

wait-on(37540) Timed out waiting for: https://localhost:3978/api/messages; exiting with error

Telemetry: agents-playground-server/error
Error: Timed out waiting for: https://localhost:3978/api/messages

Events recording disabled.
Telemetry: agents-playground-server/eventsRecording {"enabled":"false"}

Telemetry: agents-playground-server/getConfig
{
  "locale": "en-IN",
  "localTimezone": "Asia/Calcutta",
  "channelId": "emulator",
  "debugConfig": {
    "eventsRecordingEnabled": false
  }
}

Telemetry: agents-playground-server/error
Error: write EPROTO E4940000:error:0A0000C6:SSL routines:tls_get_more_records:packet length too long

InternalServiceError: write EPROTO E4940000:error:0A0000C6:SSL routines:tls_get_more_records:packet length too long:openssl\ssl\record\methods\tls_common.c:661:

    at exports.UserBotError (C:\Users\v-ttetali\AppData\Roaming\npm\node_modules\@microsoft\teams-app-test-tool\dist\index.js)
    at ConversationUpdateUserBotAccessor.handleAxiosError
    at ConversationUpdateUserBotAccessor.sendActivity
    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
    at async ConversationUpdateUserBotAccessor.sendInstallationMemberAddedActivity

Code: UserBotError

Result

• The message is submitted successfully in Agent Playground.
• The agent does not return any response.

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Additional Context

• If needed, I can provide console logs or additional configuration details to help diagnose the issue.