One step's recorded output from one past run

Returns the output the named step produced in that run — or the run's trigger payload when step addresses the trigger. Large payloads that were offloaded to object storage are rehydrated transparently.

"No data" is a 404, not an empty object. A caller must be able to tell "this run has nothing for that step" apart from "this step genuinely returned {}", so the empty case is refused rather than answered with a value that would silently mislead a mapping tree.

Values under secret-looking keys are redacted before the payload leaves the server.

Note the shape: the payload sits at data.data — the outer data is the success envelope, the inner data is this endpoint's own field name.