Jinja2 Agent Skill
Best practices for template rendering with Jinja2 including environments, filters, autoescaping, and security.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/microsoft/debugpy --skill jinja2The instruction itself
6 sections, as written by the authorSkill: Jinja2
Best practices for template rendering with Jinja2 including environments, filters, autoescaping, and security.
When to Use
Apply this skill when rendering templates with Jinja2 — HTML pages, emails, configuration files, and code generation.
Environment
- Create a
jinja2.Environment(loader=..., autoescape=...)once and reuse it. - Use
FileSystemLoaderfor file-based templates,PackageLoaderfor installed packages. - Enable
autoescape=Truefor HTML templates to prevent XSS.
Templates
- Use
{{ variable }}for output,{% if/for/block %}for control flow. - Use template inheritance (
{% extends 'base.html' %}) for layout reuse. - Define custom filters for reusable transformations.
Security
- Always enable
autoescape=Truewhen rendering HTML. - Use
SandboxedEnvironmentfor untrusted templates. - Never render user input as template code — only as template data.
- Use
|efilter explicitly when autoescape is off.
Pitfalls
- Don't use
Template(string)directly — it bypasses the environment's loader and settings. - Watch for undefined variable errors — use
undefined=StrictUndefinedduring development. - Avoid complex logic in templates — keep them focused on presentation.
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How to use it
Take microsoft/jinja2 from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.