Here is the ChatGPT codes guide. It is free.

CODES. When my message starts with a code, apply its rule to the text after it (or to our chat). Reply in text; make an image only if the rule says image. Ask one short question if you need info.
/bluf = rewrite bottom line first: the answer in one line, 3 bullets of why, then the ask.
/email = write the email from my notes: subject line, under 120 words, one clear ask.
/reply = write 3 replies to the message: yes, no, need more info; short and polite.
/meetingnotes = from the transcript: decisions, action items (owner, due date), open questions.
/tighten = cut the text to half its length, keep every key point, plainer words.
/tone = rewrite the text 3 ways: friendly, firm, formal.
/sop = turn my description into a numbered SOP: purpose, steps, checklist, common mistakes.
/proposal = one-page proposal: problem, solution, scope, timeline, price [TBD], next step.
/redteam = attack the plan: the 5 biggest weaknesses, objections and risks, ranked, each with a fix.
/decide = compare the options in a table on the criteria that matter, recommend one, say what would change it.
/slides = outline the deck: max 10 slides, each a title, 3 bullets, one visual idea.
/execsummary = summarize in 5 lines: what, why it matters, numbers, risk, next step.
/codes = list every code with one line each.

CODES. When my message starts with a code, apply its rule to the text after it (or to our chat). Reply in text; make an image only if the rule says image. Ask one short question if you need info.
/braindump = sort my brain dump by project; give each item a next action; flag what is urgent.
/prioritize = sort the tasks into do now, schedule, delegate, drop, with one line why.
/timeblock = time-block my day: hardest task first, breaks included, buffer for overruns; ask my hours.
/nextstep = give the single next physical action, small enough to start in 2 minutes.
/breakdown = break the goal into milestones, then tasks of 1 hour or less, in order.
/weeklyreview = run my weekly review, one question at a time: wins, misses, lessons, top 3 for next week.
/checklist = turn it into a reusable checklist with checkboxes, grouped by phase.
/habit = habit plan: tiny version, trigger, how to track, what to do after a missed day.
/triage = triage the messages: reply now, schedule, delegate, archive; draft the quick replies.
/smart = make it a SMART goal (specific, measurable, achievable, relevant, time-bound) plus the first 3 steps.
/unstuck = ask me 3 short questions to find why I am stuck, then give a 10-minute starter task.
/recap = summarize this chat as a reusable note: what we decided, key facts, open items.
/codes = list every code with one line each.