fix(tag-dropdown): exclude downstream blocks in loops and parallel siblings

[waleedlatif1]

Summary

• Fixed tag dropdown (< reference picker) showing downstream blocks when editing a block inside a loop
• Loop nodes are now filtered to only include blocks that are genuinely upstream (already in ancestorIds)
• Parallel sibling nodes are excluded entirely — they run simultaneously, not before the current block

Type of Change

• Bug fix

Testing

Tested manually

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)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Feb 23, 2026 10:15pm

[greptile-apps]

Greptile Summary

Fixes tag dropdown to exclude downstream blocks in loops and parallel siblings. Previously, blocks inside loops could reference downstream blocks in the same loop, and blocks inside parallels could reference sibling blocks that run simultaneously. The fix consistently applies across both frontend tag picker and copilot tools by only adding loop/parallel container IDs rather than all child nodes. Also removes unused accessibleBlocksMap calculation from serializer and calculateAccessibleBlocksForWorkflow from block path calculator.

Confidence Score: 5/5

• Safe to merge - focused bug fix with consistent logic across frontend and backend
• Clean refactor that removes genuinely unused code and fixes a logical bug where downstream/parallel blocks were incorrectly accessible. Changes are consistent across both frontend and backend codepaths.
• No files require special attention

Important Files Changed

Filename	Overview
apps/sim/app/workspace/[workspaceId]/w/[workflowId]/hooks/use-accessible-reference-prefixes.ts	Correctly removes downstream loop/parallel nodes from accessible references, only adds container IDs
apps/sim/lib/copilot/orchestrator/tool-executor/workflow-tools/queries.ts	Applies same fix to copilot tool - only adds loop/parallel container IDs, not child nodes

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