One decision in Trillion: what was chosen, why, the next step, how you will know it worked, and the options it was weighed against.
How a decision runs
1
Your AI opens the decision
It calls
start_decision with the goal in your words, the facts it has so far (each fact gets a short name the answers can point back to), and at least two options. It can pick a method made for the subject, or leave that out and use the one that works for anything. Opening a decision decides nothing: it only returns the first question.2
It answers each question
Your AI answers one question at a time with
answer_question. Every answer has to point at the facts it rests on. When a question is about you (what you value, whether this is worth your time, what keeps you going), the method expects your own words and records that they came from you. If a fact turns out to be wrong, your AI corrects it or takes it back with revise_evidence, and every change is logged.3
It decides
When no question is left, your AI calls
decide with the option chosen, the reason, the facts behind it, the next action, and how success will be measured. Sending the same decision again changes nothing.4
You say how it went
Later, your AI records what actually happened with
report_result: it worked, it did not, or it is not known yet, in your words. A decision that did not work is not a dead end: the next decision starts from that finding.What the method checks
The method walks the same steps for any subject, from a business to a meal to a piece of software. Each step asks one thing:
The scope step picks which deeper checks apply. There are ten, such as “does something already exist that could do this?”, “could this hurt someone or be hard to undo?” and “will people read the words that come out of this?”. Leaving one out is allowed only with a reason that fits the decision. Behind those steps sit several hundred specific checks that your AI either handles or explains why they do not bear on this decision.
Methods for particular subjects
Besides the method for any decision, there are methods in the words of particular subjects: cooking, a relationship, changing software, and tennis. Your AI lists them withlist_methods. Each one keeps the same steps and checks.
Where decisions show up
Decisions
Every decision your AI made with Trillion, and what is waiting for your answer.
One decision
What was decided, its results and notes, and how it was worked through. Copy a summary, download a copy, or remove it.
Home and Progress
Home shows what is waiting for your answer and your recent decisions. Progress counts your decisions and how many hit their goal.
Every AI you use
Any AI signed in to your account can list your decisions, pick one up where it was left, or export it whole. With the decisions hook, Claude Code and Codex see new decisions at the start of each turn.
What you get on each plan
On the free plan your AI walks a few decisions a month through the method, and nothing is kept. A paid plan keeps every decision, note and result on your account, brings your past decisions back when a similar one comes up, and shows how other people’s similar decisions turned out (anonymous, never naming anyone).Decisions are also the gate in Decide before building, a hook that stops Claude Code or Codex from changing files until it has decided with Trillion in the same turn.