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Add mutation score badge support - #549

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rxdt wants to merge 3 commits into
boxed:mainfrom
rxdt:codex/mutation-badge
Open

Add mutation score badge support#549
rxdt wants to merge 3 commits into
boxed:mainfrom
rxdt:codex/mutation-badge

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@rxdt

@rxdt rxdt commented Aug 8, 2026

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Adds a mutation score badge users can put in their GitHub README to show the latest mutmut mutation score, as long as they have a JSON file the badge can read from.

Why this is useful:

  • users get a simple public signal for test strength
  • mutmut gets more visibility in READMEs
  • teams can track score changes over time
  • it brings mutmut closer to what Stryker already offers

Stryker does this with a hosted service: CI uploads the score, and the badge reads it back from Stryker. Mutmut does not have a server, so the right place for this code is in mutmut itself. It generates the badge JSON, and the user can host that file wherever they want.

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