fix(copilot): streaming

[Sg312]

Summary

Fixes copilot streaming, checkpoints, depths, etc

Type of Change

• New feature

Testing

Manual

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
sim	Ready	Preview	Comment	Aug 19, 2025 5:49am

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Skipped			Aug 19, 2025 5:49am

[greptile-apps]

Greptile Summary

This PR implements comprehensive fixes for the copilot streaming functionality, addressing several key areas including depth configuration, prefetch behavior, UI interactions, and data consistency. The changes introduce a new agent configuration system that separates depth levels (0-3) from a new agentPrefetch boolean flag, replacing the previous system that encoded prefetch behavior using negative depth values (-2, -1). The API route maintains backward compatibility by mapping these negative depths to their positive equivalents with prefetch enabled.

The PR enhances user experience through several UI improvements: the ThinkingBlock component now auto-expands during streaming and collapses when finished, the copilot chat implements sophisticated scroll state tracking to prevent auto-scroll from interfering with user reading, and the user input component features a redesigned slider-based interface with clearer labeling (Fast/Balanced/Advanced/Expert). A checkpoint system has been added to diff controls, creating restore points before accepting copilot changes.

Critical data consistency fixes ensure the copilot has access to the most recent workflow state by merging subblock values from the store into both the workflow retrieval tool and diff engine baseline. This prevents user edits from being lost during copilot operations. The streaming system now includes comprehensive tool call progress tracking to only persist conversation IDs at safe checkpoints where no tools are mid-execution.

Confidence score: 2/5

• This PR requires careful review due to complex state management changes and a critical duplicate file issue
• Score lowered significantly due to an empty duplicate store file that could cause import conflicts and build issues
• Pay close attention to apps/sim/apps/sim/stores/copilot/store.ts which is an empty duplicate that needs removal

_{15 files reviewed, 3 comments}

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