René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Mixed Frontend and Backend Tool Execution Fails with OpenAI BadRequestError","articleBody":"### Description\n\nWhen executing both frontend and backend tools in a single user request, CopilotKit throws an OpenAI API error related to tool call ID validation. This issue affects both the deprecated `coagents-starter` example and the newer `with-langgraph-python` example.\n\nThe error occurs when a user requests actions that require both server-side execution (e.g., `get_weather`) and frontend UI updates (e.g., `change_color`) in the same prompt.\n\n### Examples Affected\n\n- `coagents-starter` ([original](https://github.com/CopilotKit/CopilotKit/tree/main/examples/coagents-starter) example)\n- `with-langgraph-python` (modernized example)\n\n### Steps to Reproduce\n\n1. Run this example\n2. In the chat interface, enter a prompt that triggers both frontend and backend tools:\n   ```\n   Get the weather in SF, and change the color to brown\n   ```\n\n### Expected Behavior\n\nBoth tools should execute successfully:\n1. The backend `get_weather` tool should fetch weather data for San Francisco\n2. The frontend `change_color` tool should update the UI color to brown\n3. The assistant should provide a response summarizing both actions\n\n### Actual Behavior\n\nThe request fails with an OpenAI API error:\n\n```\nopenai.BadRequestError: Error code: 400 - {\n  'error': {\n    'message': \"Invalid parameter: 'tool_call_id' of 'call_qhvIZb4R9Jzv59TZPYBPnDih' not found in 'tool_calls' of previous message.\", \n    'type': 'invalid_request_error', \n    'param': 'messages.[26].tool_call_id', \n    'code': None\n  }\n}\n```\n\n\n----\n\nIt seems that some message sequencing / ordering issue is happening when generating the requests to the LLM is triggering the issue.\n\nMay be related to https://github.com/CopilotKit/CopilotKit/issues/561\n\nThis looks to be not a problem with the example per se, but with how its using copilotkit sdk or a copilotkit issue.\n\nThanks! \n","author":{"url":"https://github.com/kittenkill","@type":"Person","name":"kittenkill"},"datePublished":"2025-07-24T18:34:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/3/with-langgraph-python/issues/3"}