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Agent skill

Polylith Migrate Generate Shim

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 Generate Shim

skills CLI
$ npx skills add DavidVujic/python-polylith --skill polylith-migrate-generate-shim -a claude-code

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

GitHub CLI
$ gh skill install DavidVujic/python-polylith polylith-migrate-generate-shim --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-generate-shim .claude/skills/polylith-migrate-generate-shim && 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-generate-shim
GitHub stars
553
Token cost
~816 tokens
SKILL.md length
256 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: List symbols exported by the new base… → Generate the shim → Verify the shim
  • SKILL.md covers Goal, Inputs, Steps and Output, plus 2 more sections
  • Calls git

What it does

Polylith Migrate Generate Shim 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.] Generate a compatibility shim that re-exports all symbols from the new base location to maintain backward compatibility during namespace migration.

Its SKILL.md is about 820 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-generate-shim”

Requirements

  • Python 3

Workflow steps

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

  1. List symbols exported by the new base location
  2. Generate the shim
  3. Verify the shim

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 Generate Shim loads about 816 tokens when it runs. Until then it costs about 82 tokens; SKILL.md has 256 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
~816

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). 256 words, ~816 tokens.

Download SKILL.mdSave it as .claude/skills/polylith-migrate-generate-shim/SKILL.md (or your agent's skills folder).
name
polylith-migrate-generate-shim
description
[Internal sub-skill of `polylith-migrate-orchestrator`. Do not load directly — load `polylith-migrate-orchestrator` first, which drives all phases.] Generate a compatibility shim that re-exports all symbols from the new base location to maintain backward compatibility during namespace migration.

Skill: polylith-migrate-generate-shim

⛓ Conditional phase (4b). Runs only when SHIM_STRATEGY=shim (chosen in polylith-migrate-analyze-imports). On the shimless path this phase is skipped — the namespace rewrite in polylith-migrate-automate-import-updates (phase 4) covers base internals, external consumers, and tests directly, leaving no shim to maintain or remove. See the polylith-migrate-orchestrator workflow.

Goal

Generate a compatibility shim (projects/<project-name>/<original_namespace>/__init__.py) that re-exports all symbols from the new base location to maintain backward compatibility during namespace migration.

Inputs

  • Project name (from migration/<project-name>/state.md)
  • Original namespace (from migration/<project-name>/state.md)
  • New namespace (from migration/<project-name>/state.md)
  • Import analysis report (from migration/<project-name>/import_analysis.md)

Steps

1. List symbols exported by the new base location
  1. Inspect the new base location's __init__.py (at bases/${TARGET_TOP_NS}/${INITIAL_BASE_NAME}/__init__.py) to list all public symbols.
  2. Compare with the symbols exported by the original namespace from the import analysis report.
2. Generate the shim
  1. Create a shim file at projects/${PROJECT}/${ORIG_TOP_NS}/__init__.py.
  2. Add re-export statements for all symbols from the new base location using from ${TARGET_TOP_NS}.${INITIAL_BASE_NAME}.<module> import <symbol>.
  3. Include an __all__ list with all re-exported symbols.

Example shim content:

python
# Compatibility shim for the migration from `${ORIG_TOP_NS}` to `${TARGET_TOP_NS}.${INITIAL_BASE_NAME}`.
# This module re-exports all public symbols from the new base location.

from ${TARGET_TOP_NS}.${INITIAL_BASE_NAME}.core import MyClass
from ${TARGET_TOP_NS}.${INITIAL_BASE_NAME}.utils import my_function

__all__ = [
    "MyClass",
    "my_function",
]
3. Verify the shim
  1. Ensure the shim's __all__ includes all symbols exported by the new base location.
  2. Record any missing symbols in migration/${PROJECT}/shim_report.md.

Output

  • A shim file: projects/<project-name>/<original_namespace>/__init__.py
  • A report file: migration/<project-name>/shim_report.md listing all re-exported symbols

Verify

  1. Confirm that projects/<project-name>/<original_namespace>/__init__.py exists and is not empty.
  2. Verify that migration/<project-name>/shim_report.md exists and lists all re-exported symbols.
  3. Ensure the shim's __all__ includes all symbols exported by the new base location.

Commit

bash
git add projects/${PROJECT}/${ORIG_TOP_NS}/__init__.py
git add migration/${PROJECT}/shim_report.md
git commit -m "migrate(${PROJECT}): phase <N> — generate-shim"

<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-generate-shim of DavidVujic/python-polylith.

Open the folder on GitHubat commit a7a80f2

Compare with similar skills

Polylith Migrate Generate Shim 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 Generate Shim compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Polylith Migrate Generate Shim this skillDavidVujic/python-polylith553—~816Automated safety check: PassMIT
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
Safe Database Migration Patternsaffaan-m/ECC276k—~3.3kAutomated safety check: PassMIT

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More from DavidVujic/python-polylith

All 37 skills in this repo

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Questions about Polylith Migrate Generate Shim

What does Polylith Migrate Generate Shim do?

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

How do I install Polylith Migrate Generate Shim in Claude Code?

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

How do I install Polylith Migrate Generate Shim in Codex?

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

Can I use Polylith Migrate Generate Shim 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-generate-shim -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-generate-shim, .gemini/skills/polylith-migrate-generate-shim, .github/skills/polylith-migrate-generate-shim and .opencode/skills/polylith-migrate-generate-shim in your project.

What does Polylith Migrate Generate Shim need to run?

Going by SKILL.md and its folder, Polylith Migrate Generate Shim needs the command-line tools its instructions call (git). Our summary lists: Python 3.

Does Polylith Migrate Generate Shim 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 Generate Shim 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 Generate Shim use?

Polylith Migrate Generate Shim 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 Generate Shim use?

About 816 tokens (SKILL.md is roughly 3.3k 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 Generate Shim?

Skills that share tags, products or a category with Polylith Migrate Generate Shim: Migrate Internal Package into Ghost (TryGhost/Ghost, 56k stars), Reversible Migration (JuliusBrussee/caveman, 111k stars), Database Migrations (affaan-m/ECC, 276k 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 Generate Shim?

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.