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Simplification guardrail: sequence removal before construction when evolving a system; build on the simpler base. Adapted from the pstack skills (MIT, (c) Lauren Tan, https://github.com/cursor/plugins), Cursor-specific tooling removed.
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Part of a 10-PR series contributing the agent-guardrail skill stack (prove-it-works, blast-radius, fix-root-causes, subtract-before-you-add, correct, interrogate, show-me-your-work, create-verification-skill, maintain-verification-skill, property-based-testing). Each PR is independent, adds exactly one single-skill plugin, and can be reviewed and merged in any order; adjacent additions to
marketplace.json/README.mdmay show trivial conflicts with sibling PRs.What
Adds the
subtract-before-you-addplugin: a simplification guardrail that sequences removal before construction when evolving a system — remove dead code, redundant validators, and stub references first, then build on the simpler base.Why
The marketplace ships code-review, security, and runtime-verification guardrails (
droid-control's/verify), but nothing covering behavioral verification discipline for the agent itself. This stack was built and battle-tested in a hackathon repo's quality gates; we are contributing it back.Provenance and license
Adapted from the pstack skills by Lauren Tan (cursor/plugins, MIT License, commit
c742dd6), with Cursor-specific machinery removed and Droid conventions applied. Made model-invocable so Droid applies it proactively.Checklist
plugins/subtract-before-you-add/with.factory-plugin/plugin.jsonskills/(per the check-skills CI).factory-plugin/marketplace.jsonentry added