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Suggests converting Dockerfiles that build artifacts in a single stage into a multi-stage build to reduce the final image size and avoid shipping build tooling in the runtime image. This rule is informational by default and is intended to be used together with the AI AutoFix flow.

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What it looks for (heuristics)

The rule triggers only when the Dockerfile has exactly one FROM stage and the stage contains at least one of:
  • A package-manager install likely related to building (e.g. apt-get install build-essential, apk add gcc)
  • A build step (e.g. go build, cargo build, npm run build, dotnet publish)
  • A download+install pattern (e.g. curl ... | tar ..., wget ... | sh)

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Auto-fix

When triggered, the rule emits an unsafe, async SuggestedFix that requires:
  • --fix --fix-unsafe
  • A configured ACP-capable agent in the config file (see the top-level [ai] section)
The resolver returns a single edit that replaces the entire Dockerfile content.

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Configuration

[rules.tally.prefer-multi-stage-build]
min-score = 4
fix = "explicit"
  • min-score (default: 4): minimum heuristic score required to trigger.
  • fix = "explicit" is recommended to avoid accidentally running AI fixes when using --fix-unsafe broadly.