jinja-expert

Author and debug Jinja2 templates for HuggingFace, Ansible, and Kubernetes workflows.

5|1|Updated Apr 19, 2026
One-click install
npx skills add https://github.com/air-gapped/skills --skill jinja-expert
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: jinja-expert
Source: https://github.com/air-gapped/skills/tree/main/.claude/skills/jinja-expert
Command: npx skills add https://github.com/air-gapped/skills --skill jinja-expert

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This skill helps developers author, read, and debug Jinja2 templates across the three places Jinja lives in 2026 — HuggingFace chat-template templates, Ansible playbooks, and Kubernetes workflows that embed Jinja around Go templates. It provides a concise map of the dialect differences and practical patterns to write safe, portable templates that render deterministically and survive engine quirks.

Core Features & Use Cases

  • Defensive patterns for cross-domain templating (namespace(), raise_exception, content-type guards) that prevent loop-scope leakage and tool-call misrendering.
  • Dialect-disambiguation guidance for HF chat templates, Ansible Jinja, and Helm-Go templates, including how to render values.yaml.j2 and Kubernetes manifests without conflating Go templates.
  • Debugging and parity techniques, including in-template debugging, engine-render parity checks, and reference to real-world incidents to illustrate common pitfalls.

Quick Start

Render a chat-template for a given messages payload using apply_chat_template and verify loop-scope, content-coercion, and tool-call handling across both string and dict argument shapes.

Frequently Asked Questions about jinja-expert

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I debug Jinja2 chat templates when tool-calling renders incorrectly?

Debug Jinja2 chat templates by applying in-template debugging techniques and engine-render parity checks. Defensive patterns like namespace(), raise_exception, and strict content-type guards prevent loop-scope leakage and tool-call misrendering across varying argument shapes.

What's the best way to handle whitespace control in HuggingFace chat templates?

Handle whitespace in HuggingFace chat templates using strict content-type checks and add_generation_prompt handling. Applying dialect-specific patterns ensures predictable rendering and prevents common engine quirks during prompt generation.

Does Jinja2 templating work the same way in Ansible playbooks and Kubernetes manifests?

Jinja2 templating differs across Ansible playbooks and Kubernetes workflows. Disambiguation guidance clarifies dialect differences, preventing the conflation of Jinja with Go templates when rendering values.yaml.j2 or Kubernetes manifests.

Why does variable scope leak in my Jinja2 loops and how do I prevent it?

Variable scope leaks in Jinja2 loops due to engine quirks. Prevent loop-scope leakage by using the namespace() pattern, which ensures predictable rendering and maintains state safely across iterations in chat templates and playbooks.

How do I ensure deterministic rendering when coercing content types in chat templates?

Ensure deterministic rendering by applying strict content-type checks and defensive coercion patterns in Jinja2 chat templates. These guards handle both string and dict argument shapes safely, preventing unpredictable rendering behavior.