dev10x-py-uv

name	Dev10x:py-uv
description	Guide UV installation and migrate Python scripts from legacy shebangs to UV inline metadata (PEP 723). TRIGGER when: migrating scripts to uv, setting up uv for the first time, or converting shebangs to PEP 723 format. DO NOT TRIGGER when: uv is already configured, or user is writing standard Python packages (not standalone scripts).
user-invocable	true
invocation-name	Dev10x:py-uv
allowed-tools	["Bash(${CLAUDE_PLUGIN_ROOT}/skills/py-uv/scripts/:*)","WebFetch(https://docs.astral.sh/uv/getting-started/installation/:*)","AskUserQuestion","Read(~/.claude/**)","Edit(~/.claude/**)","Bash(chmod:*)"]

UV Python Script Manager

Orchestration

This skill follows references/task-orchestration.md patterns. Create a task at invocation, mark completed when done:

REQUIRED: Create a task at invocation. Execute at startup:

1. TaskCreate(subject="Configure UV for Python", activeForm="Configuring UV")

Mark completed when done: TaskUpdate(taskId, status="completed")

Detect UV installation status, guide installation from official docs, and migrate legacy #!/usr/bin/env python3 scripts to self-executing UV scripts with PEP 723 inline metadata.

Workflow

1. Detect

Run the check script to assess current state:

${CLAUDE_PLUGIN_ROOT}/skills/py-uv/scripts/check-uv.sh

Parse the structured output:

• === UV_STATUS === — is UV installed?
• === PACKAGE_MANAGERS === — which installers are available?
• === SCRIPT_AUDIT === — which scripts need migration?

Branch based on exit code:

• Exit 0 → Report "UV installed, all scripts migrated" and stop.
• Exit 1 → Go to step 2 (Install).
• Exit 2 → Go to step 3 (Migrate).

2. Install (if UV missing)

1. Fetch the official installation page:

   WebFetch URL=https://docs.astral.sh/uv/getting-started/installation/
   prompt="Extract all installation methods with their exact commands. For each method list: method name, command to run, and any prerequisites."
   

2. Cross-reference with detected package managers from step 1 output.

3. Present ranked options via AskUserQuestion:

   • Rank by maintenance burden (lowest first): system package manager > pipx > standalone installer > curl
   • Only show options where the prerequisite tool is available
   • Include the exact command for each option

4. Do NOT execute the install command. Tell the user the command and let them run it. After the user confirms installation, re-run check-uv.sh to verify.

5. If UV is now installed and scripts need migration → continue to step 3. If no scripts need migration → report success and stop.

3. Migrate (if legacy scripts found)

For each file reported with WRONG_SHEBANG in the audit:

1. Read the script and identify all imports.
2. Classify imports as stdlib or third-party.
3. Build PEP 723 metadata block (see Migration Reference below).
4. Replace the shebang line (and any existing encoding declaration) with the UV shebang + metadata block.
5. Ensure executable: chmod +x <script>.
6. Update wrappers: find any .sh wrapper that calls python3 <script> and remove the python3 prefix so it uses exec "$SCRIPT_DIR/<script>" "$@".

4. Verify

Re-run check-uv.sh. Confirm:

• Exit code is 0
• wrong_shebang_count=0
• not_executable_count=0

Report the final status to the user.

---

Migration Reference

PEP 723 Template

#!/usr/bin/env -S uv run --script
# /// script
# requires-python = ">=3.12"
# dependencies = [
#     "requests>=2.31",
# ]
# ///

For stdlib-only scripts, use an empty dependency list:

#!/usr/bin/env -S uv run --script
# /// script
# requires-python = ">=3.12"
# dependencies = []
# ///

Common Mistakes

Mistake	Fix
Missing -S flag in shebang	Use #!/usr/bin/env -S uv run --script — -S enables multi-arg passing to env
Forgetting --script flag	Without it, uv run treats the file as a module, not a script
Wrong dependency names	PyPI names may differ from import names (e.g., import yaml → PyYAML)
Leaving python3 in wrappers	Wrapper scripts must exec the .py directly — UV shebang handles the rest
File not executable	Always chmod +x after migration
Existing # -*- coding: utf-8 -*- line	Remove encoding declarations — they go between old shebang and imports, conflicting with PEP 723 block placement