A thread you can test
Tools
3 notes move from the word to a real choice at work — understand it first, then decide whether to use it.
Each note stands alone, or becomes the next step in this thread.
THE QUESTION THIS PAGE ANSWERS
ANSWER FIRSTWhat is Tools, and which AI decisions does it change?
Codex plans the tool list per sample: identity trims sources, exposure decides visible vs searchable, then the result freezes into StepContext This page keeps the related concepts, common mistakes, and practical notes in one reading thread.
First decide whether you are blocked by a definition, a choice, or verification; then choose the closest of the 3 notes below.
Start with “The tool list the model sees is computed for one sample,” then restate the conclusion using your own task.
Do not treat every method in a topic as interchangeable. The answer changes with the input, risk, and acceptance bar.
THIS QUESTION THREAD
Put the word back inside the choice it changes.
The tool list the model sees is computed for one sample
Codex plans the tool list per sample: identity trims sources, exposure decides visible vs searchable, then the result freezes into StepContext
Tell the model it can go parallel — a lock keeps the floor
The model is allowed to emit several tool calls at once. A request flag, a per-tool boolean, and one read-write lock work separately; history still books in emit order
One door: a command forks by features
After a command enters the unified exec door, it forks by tty, remote env, and a 150ms window: PTY, pipe, exec-server — and only an early death can retry by policy