GitHub Actions reusable workflow nesting limit exceeded in CI

GitHub limits how deeply reusable workflows can call other reusable workflows. A call chain past the allowed depth is rejected because the nested job exceeds the maximum nesting level.

What this error means

A run fails when a reusable workflow calls another that calls another past the limit, reporting that the nesting level was exceeded.

error parsing called workflow
".github/workflows/c.yml":
job 'deploy' calls a reusable workflow which exceeds the max reusable workflow nesting level

Common causes

Too many chained workflow_call layers

Workflow A calls B which calls C which calls D, going past the supported nesting depth.

A shared workflow itself calls deeply

A commonly reused workflow already nests internally, so calling it from a deep chain pushes over the limit.

How to fix it

Flatten the call chain

1. Map the chain of uses: reusable-workflow calls.
2. Collapse intermediate layers so the depth fits within the limit.
3. Have the top workflow call leaf workflows directly where possible.

jobs:
  build:
    uses: ./.github/workflows/build.yml
  deploy:
    needs: build
    uses: ./.github/workflows/deploy.yml

Replace a layer with a composite action

Move shared step logic into a composite action so it does not consume a reusable-workflow nesting level.

How to prevent it

• Keep reusable-workflow chains shallow.
• Prefer composite actions for shared step sequences.
• Document the nesting depth of shared workflows.

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