Fix missing tool_result blocks in AI messages

[devin-ai-integration]

Fix missing tool_result blocks in AI messages

This PR adds validation and automatic fixing of AI messages where tool_use blocks don't have corresponding tool_result blocks immediately after them. This resolves the error: "messages.1: tool_use ids were found without tool_result blocks immediately after".

Changes

• Added a new validateAndFixToolMessages method to the ChatConversationImpl class in both studio and web client
• The method checks each assistant message for tool calls and ensures they have corresponding tool results
• If a tool call is missing its result, a stub tool_result message is created with an empty result object and isError flag
• Added console warnings when stub tool results are automatically created
• Implemented in both the studio app and web client for consistency

Testing

The changes have been tested to ensure they properly identify and fix missing tool_result messages.

Link to Devin run: https://app.devin.ai/sessions/53cefc79f3894347853c2b872ac2c908
Requested by: [email protected]

[devin-ai-integration]

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[devin-ai-integration]

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[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add "(aside)" to your comment to have me ignore it.
• Look at CI failures and help fix them

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