diff --git a/.github/workflows/actions-budget-watchdog.yml b/.github/workflows/actions-budget-watchdog.yml
index a5f0bbc..d221622 100644
--- a/.github/workflows/actions-budget-watchdog.yml
+++ b/.github/workflows/actions-budget-watchdog.yml
@@ -25,23 +25,12 @@ name: 'Actions Budget Watchdog'
     # deprioritises the congested boundaries first, and every schedule in this
     # estate that fires reliably sits off them.
     - cron: '41 */6 * * *'
+  # No inputs. The callee declares these as `type: number`, and forwarding a
+  # dispatch input through `${{ ... }}` yields a string, which the caller
+  # rejects before any job is created -- a zero-job run that reads exactly like
+  # an exhausted quota. The thresholds are set as literal YAML numbers below,
+  # where they are also easier to find.
   workflow_dispatch:
-    inputs:
-      allowance-minutes:
-        description: 'Included standard-runner minutes per month (GitHub Team is 3000).'
-        required: false
-        type: number
-        default: 3000
-      warn-percent:
-        description: 'Warn at or above this percentage of the allowance.'
-        required: false
-        type: number
-        default: 70
-      critical-percent:
-        description: 'Fail and raise the alert at or above this percentage.'
-        required: false
-        type: number
-        default: 85
 
 permissions:
   contents: 'read'
@@ -54,9 +43,11 @@ jobs:
   budget:
     uses: 'JorisJonkers-dev/github-workflows/.github/workflows/actions-budget-watchdog.yml@main'
     with:
-      allowance-minutes: "${{ inputs.allowance-minutes || 3000 }}"
-      warn-percent: "${{ inputs.warn-percent || 70 }}"
-      critical-percent: "${{ inputs.critical-percent || 85 }}"
+      # Literal numbers, not interpolated expressions: these inputs are
+      # `type: number` on the callee.
+      allowance-minutes: 3000
+      warn-percent: 70
+      critical-percent: 85
       # The alert lands here rather than in the offending repo: the budget is
       # an org-level fact, and when it is exhausted the private repos are
       # exactly the ones that cannot run anything.