From the code you ship

Understand the code you ship

Writing code got cheap. Understanding it did not. Point this at a repo or a PR and learn the change from the real files, so you can steer the next one.

Why we exist Explore public communities (no login) Tech Professor home

tech-professor / tp_answers.sql reading

1 <section class="rls">

2 create policy "answers

3 personal" on tp_answers

4 using (uid()=row)

5 fn diff(range)->Pkg

6 read_only(repo).scan()

7 </section>

generate

Tour generated

1 Reading the diff

2 Reading the repo, safely

3 Materialising sessions

Quiz generated

Where do answers stay personal?

RLS on tp_answers

A shared record

Flashcards generated

What is SM-2?

AgainHardGoodEasy

Learn from a repo, PR, or docs

github.com/org/repo PR #284 v1.4.0..HEAD docs/*.md a website URL a PDF

Why

Understanding is the bottleneck

Tools write and check code faster than anyone can read it. What you learn from this change decides how well you steer the next one.

Read our purpose

1.A change ships

A tool writes it, checks it, and you merge.
2.You learn what it does

A tour and a quiz from the real files.
3.You steer the next one

Better prompts, sharper reviews, faster fixes.

How it works

From a repo or a PR

Tours, quizzes, playgrounds, exams, flashcards. A course if you want them in order.

Tours

A walkthrough of the files

Each step points at a file and line in the repo or PR.

6 steps · cites 9 files Preview

Quizzes

Questions from the code

Each question has an explanation and a link to the source.

5 questions · 3 levels Preview

Playgrounds

A coding exercise

You write against the real APIs in the repo.

hidden tests Preview

Exams

Multiple choice plus a playground

You answer questions and write code.

questions + playgrounds Preview

Flashcards

A deck on a schedule

You grade how well you remembered. The deck decides when the card returns.

24 cards · spaced recall Preview

Courses

In a set order

Tours, quizzes, playgrounds, and exams. Same material for everyone. Each person has their own progress.

ordered steps · own progress Preview

Courses

A path, not a pile

A course is an ordered set of tours, quizzes, playgrounds, and exams. Same material for everyone. Each person has their own progress.

Ordered steps Own progress per person Learn · Practice · Exam

Payments onboarding

Platform Team · 6 steps

3/6 done

Your progress 50%

Learn
Tour

Payment retries, end to end

9 steps
Quiz

Retry logic essentials

12 questions
Practice
Playground

Make the charge idempotent

1 problem
4

Flashcards Up next

Idempotency gotchas

18 cards
Exam
5

Exam

Payments onboarding exam

10 items
6

Syllabus

Charge API reading list

3 documents

Payments onboarding exam

8 items · mixed

4/8 done · score 50%

12457 Summary

Item 4 of 8 multiple choice

How should the charge API make retries safe?

A Retry every failed charge immediately

B Key each attempt by a client-supplied idempotency token

C Deduplicate only inside the same HTTP connection

Previous Submit answer

Next up · hands-on exercise

Make the charge idempotent

Exams

Questions plus code

An exam mixes multiple-choice with playgrounds. You have to reason about the change and make the code work.

Questions + playgrounds Live score Hands-on code

How it is built

Watch the run

Each run moves through reading the diff, scanning the repo, planning, generating, and saving. Jobs keep running if you leave.

Read-only

Secret files stay out. Size caps apply before anything is processed.

Starts from a commit or PR

It looks at what changed, not the whole tree.

Runs in the background

Stack jobs and keep working. The tracker follows you around the app.

Generation queue

External ingest API · quiz + playground + exam

58%

Reading the diff

done

Scanning repo

done

Planning topics

done

Calling the model…

Parsing the package

Materializing sessions

Runs in the background. Leave or keep working.

Platform Team

8 members · shared by default

Your seat: Write

Jordan DaleYou

41 sessions · 92% acc

Owner

Mara Lin

47 sessions · 89% acc

Admin

Devon Park

38 sessions · 94% acc

Write

Priya Nair

33 sessions · 87% acc

Read

Sam Okafor

29 sessions · 81% acc

Read

Teams

Share the material

A team is a shared space. Everyone works through the same sessions. Each person keeps their own progress.

Anyone with the link can join

tech-professor.com/j/platform-9f3a

New members join as Readers. Free, no seat required. They get their own account and their own saved progress.

Communities

Or make it public

A public team is a community. Anyone can join as a Reader. No seat required.

Browse Discover

Quiz 482

Postgres RLS, from scratch

supabase/supabase

14 questions · @mara Join

Tour 310

Reading a Rust tool loop

tokio-rs/tokio

9 steps · @devon Join

Flashcards 690

Svelte 5 runes in practice

sveltejs/svelte

30 cards · @priya Join

Playground 254

Idempotent charge API

acme/payments

1 challenge · @jordan Join

Exam 188

Payments onboarding exam

acme/payments

12 items · @sam Join

Course 521

New hire: payments path

acme/payments

6 steps · @mara Join

Pull requests

Learning attached to the PR

A green check is not understanding. Tech Professor turns the diff into a quiz or a tour. You can see who has been through it.

Open

Add idempotency keys to the charge API #128

acme/payments @mara wants to merge feat/idempotency main

CI · all checks have passed

Vercel · deployment ready

TechProfessor Ready

Quiz, tour, playground, and exam for this change.

Details

Idempotency quiz

8 questions

What changed, a tour

5 stops

Make the charge idempotent

1 playground

Idempotency exam

6 items

Completed by

JDMLDP

3 of 5

Generate quiz Generate tour

Tutor

Help with the line you are on

The Tutor searches the repo, opens the files, and cites the line. It will not take the quiz for you.

Searches your repo Cites real files & lines Read-only & grounded

Tutor · Sharing & Permissions · Q4

Why do shared sessions keep my progress separate from my teammates?

search_repo(tp_answers RLS policy) · 3 matches

read_file(tp_answers.sql · L1–L40) · read 40 lines

The sharing model splits reads from writes. A share grants org members read access to the content via RLS, but every write is keyed to auth.uid(), so answers only ever belong to you.

tp_answers.sql · L12

Ask about this line…

MCP

From the tool that shipped it

Connect the Tech Professor MCP server. Your coding tool can turn a merged change into a tour, a quiz, and a course. It writes the material. You do the learning, and bring it to the next change.

One command to connect

$ claude mcp add-json techprofessor '{"type":"http",…}'

Claude Code and other MCP clients Scoped by your API token Tours, quizzes, playgrounds & courses

Your agent · techprofessor mcp connected

We just merged the payment-retry rework. Build the team an onboarding course for it.

Reading the merged diff now. I'll write a tour, quiz, playground, and exam, then assemble them into a course in Tech Professor.

push_artifact (type: "tour" · Payment retries, end to end) · 9 steps

push_artifact (type: "quiz" · Retry logic essentials) · 12 questions

push_artifact (type: "playground" · Make the charge idempotent) · 1 challenge

push_artifact (type: "exam" · Payments onboarding exam) · 10 items

create_course (title: "Payments onboarding") · course created

add_course_item (tour + quiz + playground + exam) · 4 steps added

Done. Payments onboarding is live for your team.

Payments onboarding

4 steps · tour → quiz → playground → exam

live

mcp: techprofessor · 6 tool calls · scoped to your token

Progress

Who learned what

Leaderboards and coverage maps for a private team or a public community.

Leaderboard by points

Mara Lin

331 answered

3,420

Devon Park

254 answered

3,290

Jordan Dale

286 answered

3,180

Priya Nair

219 answered

2,540

Sam Okafor

198 answered

2,210

Repo coverage

Architecture 88%

Data & RLS 81%

Frontend 64%

Auth & OAuth 52%

Security 71%

Keep learning from the code you ship.

Browse without login

Public sessions. Nothing is saved.

Open