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Agent skill

Polylith Migrate Verify Stability

by DavidVujic in DavidVujic/python-polylith

[Internal sub-skill of polylith-migrate-orchestrator. An agent skill from DavidVujic/python-polylith.

MITAuto-check passedDevelopment

Install Polylith Migrate Verify Stability

skills CLI
$ npx skills add DavidVujic/python-polylith --skill polylith-migrate-verify-stability -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install DavidVujic/python-polylith polylith-migrate-verify-stability --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/DavidVujic/python-polylith.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/polylith/migrate-project/polylith-migrate-verify-stability .claude/skills/polylith-migrate-verify-stability && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
polylith-migrate-verify-stability
GitHub stars
553
Token cost
~645 tokens
SKILL.md length
235 words
Files
1
Skills in repo
37
Repo updated
First seen
Licence
MIT

At a glance

[Internal sub-skill of polylith-migrate-orchestrator. An agent skill from DavidVujic/python-polylith.

  • Works in 4 steps: Run test discovery → Run a subset of tests → Check for circular imports → …
  • Development work in your project
  • SKILL.md covers Goal, Inputs, Steps and Output, plus 2 more sections
  • Calls git

What it does

Polylith Migrate Verify Stability is an agent skill from DavidVujic/python-polylith. [Internal sub-skill of polylith-migrate-orchestrator. Do not load directly — load polylith-migrate-orchestrator first, which drives all phases.] Verify that the migration did not break the project by running test discovery, checking for circular imports, and ensuring the compatibility shim covers all necessary symbols.

Its SKILL.md is about 650 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: Tooling support for the Polylith Architecture in Python. The licence is MIT.

When your agent uses it

  • Development work in your project

Example prompts

  • “/polylith-migrate-verify-stability”

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Run test discovery
  2. Run a subset of tests
  3. Check for circular imports
  4. Verify shim coverage

What it can do on your machine

Read from SKILL.md and the folder at commit a7a80f2. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Polylith Migrate Verify Stability loads about 645 tokens when it runs. Until then it costs about 90 tokens; SKILL.md has 235 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~90
When it runs · the whole SKILL.md, loaded when a task matches
~645

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from DavidVujic/python-polylith at commit a7a80f2, republished under its MIT licence (© DavidVujic). 235 words, ~645 tokens.

Download SKILL.mdSave it as .claude/skills/polylith-migrate-verify-stability/SKILL.md (or your agent's skills folder).
name
polylith-migrate-verify-stability
description
[Internal sub-skill of `polylith-migrate-orchestrator`. Do not load directly — load `polylith-migrate-orchestrator` first, which drives all phases.] Verify that the migration did not break the project by running test discovery, checking for circular imports, and ensuring the compatibility shim covers all necessary symbols.

Skill: polylith-migrate-verify-stability

Goal

Verify that the migration did not break the project by:

  1. Running test discovery and comparing the test count with the baseline
  2. Checking for circular imports
  3. Ensuring the compatibility shim covers all necessary symbols

Inputs

  • Project name (from migration/<project-name>/state.md)
  • Test command (from migration/<project-name>/state.md)
  • Baseline test count (from migration/<project-name>/state.md)

Steps

1. Run test discovery
  1. Run the test discovery command from migration/${PROJECT}/state.md.
  2. Compare the test count with the baseline from migration/${PROJECT}/state.md.
  3. Record any discrepancies in migration/${PROJECT}/stability_report.md.
2. Run a subset of tests
  1. Run a representative subset of tests using the test command from migration/${PROJECT}/state.md.
  2. Record any test failures in migration/${PROJECT}/stability_report.md.
3. Check for circular imports
  1. Verify that no circular imports remain by reviewing migration/${PROJECT}/circular_imports_resolved.md.
  2. Record any remaining circular imports in migration/${PROJECT}/stability_report.md.
4. Verify shim coverage
  1. Ensure the compatibility shim (projects/${PROJECT}/${ORIG_TOP_NS}/__init__.py) covers all necessary symbols by comparing it with the original namespace's exports.
  2. Record any missing symbols in migration/${PROJECT}/stability_report.md.

Output

  • A report file: migration/<project-name>/stability_report.md summarizing:
    • Test count before and after migration
    • Test failures (if any)
    • Circular import status
    • Shim coverage status

Verify

  1. Confirm that migration/<project-name>/stability_report.md exists and is not empty.
  2. Verify that:
    • The test count matches the baseline
    • No test failures are reported
    • No circular imports remain
    • The shim covers all necessary symbols

Commit

bash
git add migration/${PROJECT}/stability_report.md
git commit -m "migrate(${PROJECT}): phase <N> — verify-stability"

<N> is this phase's number from the polylith-migrate-orchestrator table (the single source of truth) — do not hardcode it.

© DavidVujic, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/polylith/migrate-project/polylith-migrate-verify-stability of DavidVujic/python-polylith.

Open the folder on GitHubat commit a7a80f2

Compare with similar skills

Polylith Migrate Verify Stability next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Polylith Migrate Verify Stability compared with similar skills
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Polylith Migrate Verify Stability this skillDavidVujic/python-polylith553—~645Automated safety check: PassMIT
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PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Polylith Migrate Verify Stability

What does Polylith Migrate Verify Stability do?

[Internal sub-skill of polylith-migrate-orchestrator. An agent skill from DavidVujic/python-polylith. Polylith Migrate Verify Stability is an agent skill from DavidVujic/python-polylith. [Internal sub-skill of polylith-migrate-orchestrator.

When should I use Polylith Migrate Verify Stability?

Polylith Migrate Verify Stability fits situations like: development work in your project.

How do I install Polylith Migrate Verify Stability in Claude Code?

Run `npx skills add DavidVujic/python-polylith --skill polylith-migrate-verify-stability -a claude-code`. Or copy the skill folder (.agents/skills/polylith/migrate-project/polylith-migrate-verify-stability in DavidVujic/python-polylith) into .claude/skills/polylith-migrate-verify-stability in your project. Claude Code loads it when a task matches its description.

How do I install Polylith Migrate Verify Stability in Codex?

Run `npx skills add DavidVujic/python-polylith --skill polylith-migrate-verify-stability -a codex`. Or copy the skill folder (.agents/skills/polylith/migrate-project/polylith-migrate-verify-stability in DavidVujic/python-polylith) into .agents/skills/polylith-migrate-verify-stability in your project. Codex loads it when a task matches its description.

Can I use Polylith Migrate Verify Stability in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add DavidVujic/python-polylith --skill polylith-migrate-verify-stability -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/polylith-migrate-verify-stability, .gemini/skills/polylith-migrate-verify-stability, .github/skills/polylith-migrate-verify-stability and .opencode/skills/polylith-migrate-verify-stability in your project.

What does Polylith Migrate Verify Stability need to run?

Going by SKILL.md and its folder, Polylith Migrate Verify Stability needs the command-line tools its instructions call (git).

Does Polylith Migrate Verify Stability access the network?

SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Polylith Migrate Verify Stability safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Polylith Migrate Verify Stability use?

Polylith Migrate Verify Stability is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Polylith Migrate Verify Stability use?

About 645 tokens (SKILL.md is roughly 2.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Polylith Migrate Verify Stability?

Skills that share tags, products or a category with Polylith Migrate Verify Stability: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 296k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Polylith Migrate Verify Stability?

DavidVujic (a GitHub user) maintains it in DavidVujic/python-polylith, which has 553 GitHub stars. The repository holds 37 skills in this directory. The repository was last updated on October 4, 2026.

Source: DavidVujic/python-polylith on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.