Feat/file block write

[TheodoreSpeaks]

Summary

Brief description of what this PR does and why.

Fixes #(issue)

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• Other: ___________

Testing

How has this been tested? What should reviewers focus on?

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)

Screenshots/Videos

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Mar 29, 2026 1:57am

[TheodoreSpeaks]

@cursor review

[cursor]

PR Summary

Medium Risk
Adds a new authenticated API endpoint that can create/overwrite/append workspace files and updates storage metadata, which could impact persisted user data if misused or buggy. Risk is moderate due to new write paths and reliance on correct workspace/user scoping and quota enforcement.

Overview
Adds workspace file writing support via a new internal-only POST /api/tools/sim-file/manage endpoint that handles a write operation to create a file by name (auto-inferring MIME type), overwrite/append existing content, or update by fileId, returning file metadata.

Extends the File v3 block to support an operation selector (read vs file_write), conditionally renders/validates inputs for each mode, and expands outputs to include write results.

Registers the new tool and lookup helper by adding fileWriteTool (apps/sim/tools/file/write.ts), exporting it from tools/file, registering file_write in the tool registry, and adding getWorkspaceFileByName to workspace-file-manager to enable overwrite-by-name behavior.

^{Written by Cursor Bugbot for commit fdb6039. This will update automatically on new commits. Configure here.}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Silent error masking causes incorrect create-vs-update routing
  • getWorkspaceFileByName now rethrows database lookup errors instead of returning null, so write-by-name no longer misroutes to create when lookup fails.

Or push these changes by commenting:

@cursor push ee6f7d15f4

Preview (ee6f7d15f4)

diff --git a/apps/sim/lib/uploads/contexts/workspace/workspace-file-manager.ts b/apps/sim/lib/uploads/contexts/workspace/workspace-file-manager.ts
--- a/apps/sim/lib/uploads/contexts/workspace/workspace-file-manager.ts
+++ b/apps/sim/lib/uploads/contexts/workspace/workspace-file-manager.ts
@@ -320,7 +320,7 @@
     }
   } catch (error) {
     logger.error(`Failed to get workspace file by name "${fileName}":`, error)
-    return null
+    throw error
   }
 }

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