Upgrade dependencies in brownfield applications while preserving spec-driven control.
npx skills add https://github.com/jschulte/stackshift --skill modernize
Please help me install this Agent Skill. Skill: modernize Source: https://github.com/jschulte/stackshift/tree/main/skills/modernize Command: npx skills add https://github.com/jschulte/stackshift --skill modernize
Brownfield upgrades are risky and time-consuming. This Skill automates upgrading all dependencies and modernizing the application while preserving spec-driven control, reducing manual toil and preserving validated behavior.
Run this Skill after Gear 6 with the modernize flag enabled to upgrade dependencies, refresh tests, and synchronize specs. The workflow includes pre-upgrade audit, dependency upgrades, breaking-change handling, and spec alignment.
High-intent search queries and answers about installing and using this skill.
Spec-driven modernization upgrades all dependencies across your tech stack while preserving validated behavior through existing tests and specs. After Gear 6 completion with the modernize flag enabled, the Skill automatically detects package managers, audits current versions, executes stack-specific upgrade commands, runs tests, remediates breaking changes guided by specs, and re-validates 85%+ test coverage to ensure alignment.
Breaking changes are identified during test execution and remediated using your specs as the source of truth. The Skill captures failures, applies spec-guided fixes, synchronizes specs to reflect necessary changes, and verifies that test coverage remains above 85% before completing the upgrade.
Yes. The Skill automatically detects and handles multiple package managers within your brownfield project, applying stack-specific upgrade commands to all supported stacks simultaneously while maintaining spec-driven control across the entire application.
Complete Gear 6 first and enable the modernize flag. Your project must have existing specs and tests in place; the Skill requires 85%+ test coverage and alignment with /speckit.analyze to ensure validated behavior is preserved during upgrades.
Specs act as guardrails for acceptable behavior. The Skill uses them to guide breaking-change fixes, validate upgrades against documented requirements, and prevent drift between code and specification. Post-upgrade verification confirms test coverage and alignment with specs before completion.
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