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title: Write Mutalog in pure SWI-Prolog status: accepted tags:
- decision
- packaging
origin: kind: import ref: plan:open-decisions/language-of-the-tool recorded_at: '2026-10-29T16:05:44.597Z' id: ADR-packaging-pure-swi-prolog type: adr --- ## Context
The design plan weighed a pure SWI-Prolog pack against a plugin for an existing JavaScript mutation testing tool that shells out to swipl. A plugin would reuse existing reporters for free, but would tie Mutalog to the Node ecosystem and to another tool's plugin API.
Decision
Mutalog is a pure SWI-Prolog pack with no dependencies outside the SWI-Prolog distribution, installable with pack_install. Report compatibility comes from writing JSON in the open mutation-testing-report-schema instead.
Consequences
Prolog users install it like any other pack. Development tooling in this repository (package.json, used only for the knowledge base and its report) is not part of the pack and is never a runtime dependency.