New: 98,000+ skills indexed from GitHub repos with 100+ stars · every skill safety-checkedBrowse top skillsTop skills
Esc to closeBrowse all skills
Submit a skillBrowse skills
Submit a skillBrowse skills

Agent skill

Polylith Migrate Extract Standalone Modules

by DavidVujic in DavidVujic/python-polylith

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

MITAuto-check passed

Install Polylith Migrate Extract Standalone Modules

skills CLI
$ npx skills add DavidVujic/python-polylith --skill polylith-migrate-extract-standalone-modules -a claude-code

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

GitHub CLI
$ gh skill install DavidVujic/python-polylith polylith-migrate-extract-standalone-modules --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-extract-standalone-modules .claude/skills/polylith-migrate-extract-standalone-modules && 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-extract-standalone-modules
GitHub stars
553
Token cost
~964 tokens
SKILL.md length
423 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 3 steps: Analyze the Residual Component → Extract Modules in Dependency Order → For Each Extraction
  • SKILL.md covers Goal, Inputs, Steps and Verify, plus 2 more sections
  • Calls git

What it does

Polylith Migrate Extract Standalone Modules 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.] Extract foundational modules (e.g., consts.py, exceptions.py, or similar) from the residual component into standalone components.

Its SKILL.md is about 960 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

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

Example prompts

  • “/polylith-migrate-extract-standalone-modules”

Workflow steps

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

  1. Analyze the Residual Component
  2. Extract Modules in Dependency Order
  3. For Each Extraction

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 Extract Standalone Modules loads about 964 tokens when it runs. Until then it costs about 82 tokens; SKILL.md has 423 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~82
When it runs · the whole SKILL.md, loaded when a task matches
~964

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). 423 words, ~964 tokens.

Download SKILL.mdSave it as .claude/skills/polylith-migrate-extract-standalone-modules/SKILL.md (or your agent's skills folder).
name
polylith-migrate-extract-standalone-modules
description
[Internal sub-skill of `polylith-migrate-orchestrator`. Do not load directly — load `polylith-migrate-orchestrator` first, which drives all phases.] Extract foundational modules (e.g., `consts.py`, `exceptions.py`, or similar) from the residual component into standalone components.

Skill: polylith-migrate-extract-standalone-modules

Goal

Extract foundational modules (e.g., consts.py, exceptions.py, models.py) from the residual component into standalone components. This skill is for zero-dependency or low-dependency modules that serve as building blocks for other components.

Inputs

From migration/<PROJECT>/state.md:

  • TARGET_TOP_NS
  • INITIAL_BASE_NAME
  • Verification commands.

From migration/<PROJECT>/manifest.md:

  • Current module map, including what remains in the residual component.

All inputs from state.md are assumed to satisfy the validation rules in polylith-migrate-discover (### Validation rules). Validate before proceeding.

Steps

1. Analyze the Residual Component
  • Use directory_tree and grep to list modules remaining in the residual component.
  • Classify each module:
    • Zero internal deps: Modules with only stdlib/third-party imports (e.g., exceptions.py, consts.py).
    • Low internal deps: Modules that depend on already extracted or zero-dep modules (e.g., models.py).
    • App-wiring: Modules that compose infrastructure setup. These stay in the residual.
2. Extract Modules in Dependency Order
  • Extract zero-dep modules first, followed by modules that depend on them.
3. For Each Extraction
  1. Check for naming collisions.
  2. Create the component directory with __init__.py and core.py.
  3. Update imports in all consumers.
  4. Add the new brick to pyproject.toml.
  5. Run verification.
  6. Delete the original module from the residual component.

Verify

  • RUN_TEST_CMD succeeds.
  • If set, RUN_LINT_CMD and RUN_TYPECHECK_CMD succeed.
  • Run POLY_CMD_PREFIX check to validate the workspace structure.
  • Run POLY_CMD_PREFIX sync to synchronize the [tool.polylith.bricks] table with actual imports.
Show full SKILL.md (208 more words)Show less

Common failure modes

SymptomLikely causeRemediation
Module classified as zero-dep actually pulls in a transitive runtime dependency (e.g., reads an env var via the residual's config module)The classification missed an indirect import.Reclassify as low-dep, extract the config module first, then retry.
Two consumers now import the same constant via different paths (e.g., from <ns>.consts and from <ns>.<INITIAL_BASE_NAME>.consts)The original module wasn't deleted from the residual after extraction.Delete the original from the residual (step 3.6), pick one canonical import path, and update every caller. Verify with grep -r '<ns>.<INITIAL_BASE_NAME>.consts'.
Extracting exceptions.py causes except clauses elsewhere to stop catching what they used toException classes are identity-based: two definitions are two different classes.Ensure the new standalone module is the only definition. Delete the residual copy and update every raise/except site.
Verification fails and you can't quickly diagnosePhase commit not yet made.git reset --hard HEAD to roll back to the previous phase's commit and consult the user.

Commit

After verification passes, commit this phase to the migration branch:

bash
git add -A && git commit -m "migrate(<PROJECT>): phase <N> — extract-standalone-modules"

Substitute <PROJECT>, <N>, and <phase-name> from state.md and the orchestrator's phase table. Do not proceed to the next phase without a clean commit — the per-phase commit is the rollback point for the next phase's failure-mode tables.

© 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-extract-standalone-modules of DavidVujic/python-polylith.

Open the folder on GitHubat commit a7a80f2

Compare with similar skills

Polylith Migrate Extract Standalone Modules 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 Extract Standalone Modules compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Polylith Migrate Extract Standalone Modules this skillDavidVujic/python-polylith553—~964Automated safety check: PassMIT
Extract ModuleJetBrains/intellij-community21k—~5.2kAutomated safety check: PassCustom licence
Migrate Internal Package into GhostTryGhost/Ghost56k—~3.8kAutomated safety check: PassMIT
Reversible MigrationJuliusBrussee/caveman111k1 repos~196Automated safety check: PassApache-2.0
Database Migrationsaffaan-m/ECC276k4 repos~3kAutomated safety check: PassMIT
Database Migrationsaffaan-m/ECC276k1 repos~2.4kAutomated safety check: PassMIT

Similar skills

  • Extract Module

    JetBrains/intellij-community

    Official

    Extract optional plugin dependencies into IntelliJ content modules.

    21k GitHub stars~5.2k tokensUpdated today
    MobileAuto-check passed

  • Migrate Internal Package into Ghost

    TryGhost/Ghost

    Moves a package from another TryGhost repository into Ghost as an internal workspace package while keeping its Git history, with checkpoints for the steps that need an administrator.

    56k GitHub stars~3.8k tokensUpdated today
    DevelopmentAuto-check passed

  • Reversible Migration

    JuliusBrussee/caveman

    Implement reversible compatibility-safe transitions. Use for schema, data, API, protocol, configuration, or dependency migrations requiring rollback and…

    111k GitHub starsUsed in 1 repo~196 tokens
    DevelopmentAuto-check passed

  • Database Migrations

    affaan-m/ECC

    Safe, reversible database migration patterns: forward-only production changes, expand-contract zero-downtime renames, concurrent indexes, batched backfills, and per-tool workflows for PostgreSQL…

    276k GitHub starsUsed in 4 repos~3k tokens
    DatabasesAuto-check passed

  • Database Migrations

    affaan-m/ECC

    Şema değişiklikleri, veri migration'ları, rollback'ler ve PostgreSQL, MySQL ve yaygın ORM'ler (Prisma, Drizzle, Django, TypeORM, golang-migrate) arasında sıfır kesinti deployment'ları için…

    276k GitHub starsUsed in 1 repo~2.4k tokens
    DatabasesAuto-check passed

  • Expo Migrate Module

    expo/skills

    Official

    Migrate an existing Apple/Swift Expo native module from the Expo Modules API 1.0 definition DSL to the 2.0 macro API (sometimes called v2) while preserving its JavaScript and TypeScript contract.

    2.7k GitHub stars~2.6k tokensUpdated 2 days ago
    MobileAuto-check passed

More from DavidVujic/python-polylith

All 37 skills in this repo

  • Polylith Base Creation

    DavidVujic/python-polylith

    Create a Polylith base with poly create base — the entry point of a deployable application (HTTP API, CLI, message-queue consumer, AWS Lambda handler, GCP Cloud Function, scheduled job).

    553 GitHub stars~757 tokensUpdated 5 days ago
    Auto-check passed

  • Polylith Check

    DavidVujic/python-polylith

    Validate a Polylith workspace with poly check — the canonical CI gate.

    553 GitHub stars~972 tokensUpdated 5 days ago
    Auto-check passed

  • Polylith Component Creation

    DavidVujic/python-polylith

    Create a Polylith component with poly create component — a reusable, isolated brick implementing business logic, a feature, a domain module, or a capability.

    553 GitHub stars~800 tokensUpdated 5 days ago
    Auto-check passed

  • Polylith Dependency Management

    DavidVujic/python-polylith

    Add or manage third-party dependencies in a Polylith workspace.

    553 GitHub stars~643 tokensUpdated 5 days ago
    Auto-check passed

  • Polylith Dependency Visualization

    DavidVujic/python-polylith

    Visualize brick × brick dependencies with poly deps — find circular dependencies, inspect a brick's public interface, and detect interface-bypass violations.

    553 GitHub stars~906 tokensUpdated 5 days ago
    Auto-check passed

  • Polylith Diff

    DavidVujic/python-polylith

    List Polylith bricks whose implementation changed since a git tag using poly diff.

    553 GitHub stars~1.1k tokensUpdated 5 days ago
    Auto-check passed

Questions about Polylith Migrate Extract Standalone Modules

What does Polylith Migrate Extract Standalone Modules do?

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

How do I install Polylith Migrate Extract Standalone Modules in Claude Code?

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

How do I install Polylith Migrate Extract Standalone Modules in Codex?

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

Can I use Polylith Migrate Extract Standalone Modules 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-extract-standalone-modules -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-extract-standalone-modules, .gemini/skills/polylith-migrate-extract-standalone-modules, .github/skills/polylith-migrate-extract-standalone-modules and .opencode/skills/polylith-migrate-extract-standalone-modules in your project.

What does Polylith Migrate Extract Standalone Modules need to run?

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

Does Polylith Migrate Extract Standalone Modules 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 Extract Standalone Modules 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 Extract Standalone Modules use?

Polylith Migrate Extract Standalone Modules 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 Extract Standalone Modules use?

About 964 tokens (SKILL.md is roughly 3.9k 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 Extract Standalone Modules?

Skills that share tags, products or a category with Polylith Migrate Extract Standalone Modules: Extract Module (JetBrains/intellij-community, 21k stars), Migrate Internal Package into Ghost (TryGhost/Ghost, 56k stars), Reversible Migration (JuliusBrussee/caveman, 111k stars) and Database Migrations (affaan-m/ECC, 276k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Polylith Migrate Extract Standalone Modules?

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.