Free Course Tools
Hands-on practice for The Magic Codex's free video courses. The Prompt Simulator scores your prompts 0–10 across 18 scenarios, from vague emails to Socratic tutoring. The Agent Simulator trains agentic skills — planning, tool use, recovery, guardrails — across 8 scenarios, with a course certificate for the capstone. Every episode of the courses ends here: watch, practice, next episode.
Prompt Simulator
Practice prompt engineering: write prompts, get scored 0–10, see what vague vs. precise earns.
Open tool → LiveAgent Simulator
Practice AI agent design: design loops or walk the loop turn by turn, get scored 0–10, earn the course certificate.
Open tool →Related categories
More from the codex
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Every category on the codex, from study tools to ciphers — pick your starting point.
Browse → LivePrompt Simulator
Practice prompt engineering: write prompts, get scored 0–10.
Open tool → LiveGPA Calculator
Semester and cumulative GPA with weighted scales and a target planner.
Open tool →About these course tools
Every tool below is free, works in your browser, and needs no account.
- Are the simulators really free?
- Yes — every scenario is free, with no sign-up and no limits. Your best scores are saved in your own browser.
- Do I need to watch the video course first?
- No. Each scenario explains its own task, so you can practice cold. The videos teach the theory; the simulators build the reflex.
- Is my work sent anywhere?
- Nothing you type ever leaves your browser. Scoring is deterministic and runs locally — the same input always earns the same score.
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The Magic Codex is built by an independent developer. If these free tools saved you time, consider supporting future ones.
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