GitHub Actions "set-output command is deprecated and disabled"

The "::set-output name=...::" workflow command was deprecated and is now disabled for security. Steps still using it silently fail to set outputs, breaking downstream references.

What this error means

A step prints a deprecation warning (or its output is simply empty), and later steps that read the output get nothing.

Warning: The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files.

Common causes

Legacy ::set-output:: still in use

A run step or older action echoes "::set-output::", which the runner no longer honors.

How to fix it

Write to GITHUB_OUTPUT instead

1. Replace each "::set-output name=key::value" with "echo \"key=value\" >> $GITHUB_OUTPUT".
2. Update any third-party actions to versions that use environment files.
3. Re-run and confirm downstream references resolve.

- id: meta
  run: echo "sha=${GITHUB_SHA}" >> "${GITHUB_OUTPUT}"
- run: echo "built ${{ steps.meta.outputs.sha }}"

How to prevent it

• Use GITHUB_OUTPUT environment files for all step outputs.
• Keep third-party actions updated past their set-output deprecation.

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