Add layer-awareness guidance to test-affected-find skill#1623
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…uidance Agent-Logs-Url: https://github.com/usethis-python/usethis-python/sessions/9e51f485-9335-42b3-91a8-d11390dd4db4 Co-authored-by: nathanjmcdougall <18602289+nathanjmcdougall@users.noreply.github.com>
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[WIP] Fix agent heuristics for lower-level layer modifications
Add layer-awareness guidance to test-affected-find skill
Mar 28, 2026
nathanjmcdougall
approved these changes
Mar 28, 2026
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Agents modifying low-level layers (e.g.
_file) were not running tests for higher-level layers that depend on them, causing regressions likeTestAddAuthor.test_appendto slip through undetected.Changes
usethis-python-test-affected-findskill (v1.0 → v1.1).importlinterbefore identifying tests to run[importlinter:contract:usethis]and the rule: when modifying a layer, run tests for every layer above it tooThe layer hierarchy (lowest → highest):
Modifying
_file(e.g.TOMLFileManager) requires running tests all the way up through_core,_ui, etc. — not justtests/usethis/_file/.💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.