# Variable injection via deploy webhooks for Applications (parity with Sites)

**Project:** Servers | **Board:** Live | **Votes:** 2
**URL:** https://roadmap.ploi.io/projects/1-server-level-requests/items/1468-variable-injection-via-deploy-webhooks-for-applications-parity-with-sites

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Sites already support passing variables through deploy webhooks:

POST /webhooks/servers/{id}/sites/{id}/deploy
Body: {"variables": {"tag": "2026.03.16.3"}}
→ $TAG is available in the deploy script ✅

The same pattern doesn't work for Applications:

POST /webhooks/servers/{id}/applications/{id}/deploy
Body: {"variables": {"tag": "2026.03.16.3"}}
→ $TAG is empty in the deploy script ❌

**Use case:** We use deploy webhooks to trigger versioned deploys from CI — passing a git tag as a variable so the deploy script can run `git checkout tags/$TAG`. This works great for sites but blocks us from doing the same for applications.

**Ask:** Bring the /applications/ webhook endpoint to parity with /sites/ for variable injection. No new interface needed — just the same body parsing behavior already implemented for sites.

This unlocks proper tag-based deploys for application servers via external CI triggers.