pdm-migration-specialist

Development

Migrate pyproject.toml from pre-PDM 2.0 syntax to modern PEP-compliant format. Focuses on dev-dependencies to dependency-groups conversion and PEP 621 project metadata. Integrates with Context7 for latest PDM documentation.

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PDM Migration Specialist

Focused skill for migrating pyproject.toml files from pre-PDM 2.0 legacy syntax to modern PEP-compliant format.

When to Use

Activate when the user:

Needs to migrate from [tool.pdm.dev-dependencies] to [dependency-groups]
Wants to update legacy pyproject.toml to PEP 621 standards
Asks about old vs new PDM syntax
Needs to understand modern dependency specification
Mentions PDM migration, legacy format, or pre-2.0 syntax
Encounters deprecated PDM configuration patterns

Core Capabilities

Dev Dependencies Migration: Convert [tool.pdm.dev-dependencies] → [dependency-groups]
PEP 621 Compliance: Migrate to standardized [project] table
Dependency Specification: Modern PEP 440/508 formats
Build Backend Updates: Migrate to pdm-backend
Local Dependencies: Convert to file:///${PROJECT_ROOT}/ syntax
Context7 Integration: Fetch latest PDM migration docs

Quick Migration Patterns

Development Dependencies (Most Common)

Old (Pre-2.0):

[tool.pdm.dev-dependencies]
test = ["pytest>=6.0", "pytest-cov"]
lint = ["flake8", "black"]

New (PEP 735):

[dependency-groups]
test = ["pytest>=6.0", "pytest-cov"]
lint = ["flake8", "black"]

Project Metadata

Old (Legacy):

[tool.pdm]
name = "myproject"
version = "1.0.0"

New (PEP 621):

[project]
name = "myproject"
version = "1.0.0"
dependencies = ["requests>=2.28.0"]
requires-python = ">=3.11"

Build Backend

Old:

[build-system]
requires = ["setuptools", "wheel"]
build-backend = "setuptools.build_meta"

New:

[build-system]
requires = ["pdm-backend"]
build-backend = "pdm.backend"

Key Differences

Aspect	Pre-2.0	Modern (2.0+)
Dev Dependencies	`[tool.pdm.dev-dependencies]`	`[dependency-groups]`
Project Metadata	`[tool.pdm]` or non-standard	`[project]` (PEP 621)
Optional Deps	Various formats	`[project.optional-dependencies]`
Local Paths	Relative paths	`file:///${PROJECT_ROOT}/`
Build Backend	setuptools/flit	`pdm-backend` preferred

CLI Changes

Adding Dev Dependencies:

# Old approach (still works but deprecated)
pdm add --dev pytest

# New approach (PEP 735)
pdm add -dG test pytest

Reference Documentation

Detailed Migration Guide: See reference.md in this directory
Real Migration Examples: See examples.md in this directory
Context7 Library ID: /pdm-project/pdm
Relevant PEPs: PEP 621 (project metadata), PEP 735 (dependency groups)