Codex Exec

Autonomous task execution via the codex CLI. Runs non-interactively. Progress streams to stderr; final result on stdout.

codex exec --skip-git-repo-check "task description" < /dev/null

For large context, pipe it via stdin. The prompt stays as the argument, context is passed as <stdin> automatically:

cat context.txt | codex exec --skip-git-repo-check "question about the context"

Route text you did not author through this channel whatever its size — a diff, file contents, a code comment, a plan or spec, third-party feedback, command output. Write the context file with the Write tool so nothing is interpreted on the way in. Keep backticks, $, and straight double quotes out of the quoted argument even in text you wrote: the first two stay live inside it, and a double quote ends it. When the prompt itself must carry any of them, as when it quotes a title or a passage, write the whole prompt and its context to one file with the Write tool and pass -, so stdin is the entire prompt:

cat prompt.txt | codex exec --skip-git-repo-check -