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jac-config

Configure jac.toml sections, dependencies, profiles, and CLI settings for Jac projects.

Updated Jul 26, 2026
Search Tags:#project setup#dependencies#cli#configuration#profiles#jac#jac.toml
One-click install
npx skills add https://github.com/PMN123/trapdoor --skill jac-config-pmn123
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: jac-config
Source: https://github.com/PMN123/trapdoor/tree/main/.agents/skills/jac-config
Command: npx skills add https://github.com/PMN123/trapdoor --skill jac-config-pmn123

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Jac projects centralize all settings in a single jac.toml file, but its many sections, per-key hyphen/underscore conventions, and CLI verbs are easy to get wrong, causing silently ignored settings and misconfigured builds. ## Core Features & Use Cases - Complete section reference: Documents every jac.toml table including [project], [dependencies], [serve], [run], [check.lint], [test], [byllm], [scale], [client], [desktop], and capability tables. - Dependency and config CLI verbs: Covers jac install/remove/update for PyPI, npm, and git packages plus jac config get/set/list for reading and writing settings. - Profiles and interpolation: Explains ${VAR} environment variable interpolation and JAC_PROFILE-based environment overrides with inheritance. - Use Case: When adding an AI model to a Jac app, consult this Skill to correctly write the [byllm.model] table with an interpolated API key, then run jac install to pull litellm into .jac/venv. ## Quick Start Ask the assistant to load the jac-config skill and help you add a production environment profile with caching enabled to your jac.toml.

Frequently Asked Questions about jac-config

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

FAQPage Schema
How do I configure jac.toml for a Jac project?▼

Edit jac.toml sections directly or use jac config set for individual keys, such as jac config set serve.port 3000. Generate the initial file with jac create, then verify any hand-edited key with jac config get since wrong key forms are silently ignored.

How do I install dependencies in a Jac project?▼

Run jac install <pkg> to install a PyPI package and record it in [dependencies] with an auto-pinned ~=major.minor spec. Use --dev for dev tools, --git for git URLs, and run jac install after editing dependency tables by hand.

How do environment profiles work in Jac?▼

Define [environments.<name>] tables in jac.toml and activate one with JAC_PROFILE=production or the --profile flag on jac run, start, or test. Profiles can inherit from each other via the inherits key and override any section values.

Why is my jac.toml setting being ignored?▼

Hyphen versus underscore usage is per-key and unforgiving: entry-point and requires-python use hyphens while fail_fast and base_route_app use underscores. A wrong form fails silently, so confirm the parsed value with jac config get <key>.

Can I use environment variables in jac.toml?▼

Yes, ${VAR} interpolation works in any string value, with ${VAR:-default} for fallbacks and ${VAR:?message} for required variables. A common use is storing API keys like api_key = "${OPENAI_API_KEY}" in [byllm.model].

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