fix: don't write to node_modules. NPM doesn't like it

[fjakobs]

I'm getting errors like this:

$ databricks experimental aitools tools validate ./ --profile dais
Error: install failed (duration: 0.9s)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔍 Databricks AI Tools MCP server: Validating your app
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Validation Progress:
🔄 Starting Node.js validation: build + typecheck + tests
⏳ Step 1/6: Running Install...
❌ Install failed (0.9s)

❌ Failed to install dependencies

Exit code: 190

Stdout:


Stderr:
npm error code ENOTEMPTY
npm error syscall rename
npm error path /Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/appkit
npm error dest /Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/.appkit-guYJj7r0
npm error errno -66
npm error ENOTEMPTY: directory not empty, rename '/Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/appkit' -> '/Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/.appkit-guYJj7r0'
npm error A complete log of this run can be found in: /Users/fabian.jakobs/.npm/_logs/2026-01-12T10_22_57_769Z-debug-0.log

Error: validation failed

[MarioCadenas]

I'm getting errors like this:

$ databricks experimental aitools tools validate ./ --profile dais
Error: install failed (duration: 0.9s)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔍 Databricks AI Tools MCP server: Validating your app
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Validation Progress:
🔄 Starting Node.js validation: build + typecheck + tests
⏳ Step 1/6: Running Install...
❌ Install failed (0.9s)

❌ Failed to install dependencies

Exit code: 190

Stdout:


Stderr:
npm error code ENOTEMPTY
npm error syscall rename
npm error path /Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/appkit
npm error dest /Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/.appkit-guYJj7r0
npm error errno -66
npm error ENOTEMPTY: directory not empty, rename '/Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/appkit' -> '/Users/fabian.jakobs/Workspaces/skill-builder/nyc-taxi-viz/node_modules/@databricks/.appkit-guYJj7r0'
npm error A complete log of this run can be found in: /Users/fabian.jakobs/.npm/_logs/2026-01-12T10_22_57_769Z-debug-0.log

Error: validation failed

This is weird, it actually has nothing to do with the folder we are using to write the cache files

we write into node_modules/.databricks/ and this is erroring on node_modules/@databricks/.appkit which is strange, I don't think this code is the one making it fail

[MarioCadenas]

not needed in the end