Get result of action in Stackstorm

I am creating a Stackstorm workflow where I want to get the stdout result from one task and compare it in an other task.
But I can’t manage to retreive the result value of my action.
Sample code:

actions/workflow/do_stuff.yaml

version: 1.0
description: do_stuff.

input:
  - stuff

tasks:
  do_stuff:
    action: "core.local"
    input:
      cmd: "/usr/bin/do_stuff '{{ ctx('stuff') }}'"
      timeout: 600

    next:
      - publish:
        - stdout: "{{ result()['stdout'] }}"
        - stderr: "{{ result()['stderr'] }}"
      - when: <% failed() %>
        do: fail


output:
  - stdout: "{{ ctx('stdout') }}"
  - stderr: "{{ ctx('stderr') }}"

actions/do_stuff.yaml

---
name: do_stuff
pack: stuff_pack
description: do some stuff
runner_type: orquesta
entry_point: workflows/do_stuff.yaml
enabled: true
parameters:
  stuff:
    required: true
    type: "string"
    description: "the stuff"

actions/workflow/lifecycle.yaml

version: 1.0

description: The stuff workflow

vars:
  - stuff_result_stdout: null

tasks:

  first_task:
    action: "stuff_pack.do_stuff"
    input:
      stuff: "parameter"

    next:
      - publish:
          - stuff_result_stdout: <% result().stdout %>
      - when: "{{ succeeded() }}"
        do:
          - "second_task"

  second_task:
      action: core.echo message="msg-{{ ctx().stuff_result_stdout }}-"

On the Stackstorm web UI, i clearly see the output of my command (/usr/bin/do_stuff)

with this line stuff_result_stdout: <% result().stdout %>
I have the error YaqlEvaluationException: Unable to resolve key 'stdout' in expression '<%result().stdout %>' from context.

and when I try to get only result(), and print it, I have None.

How do I retreive the output of my action in first_task?

You might be looking in the wrong place for your error.

What is the result() in the do_stuff task in the do_stuff workflow? What is the value of result()['stdout'] from that task?

I had a small error in my lifecycle.yaml:
if you publish and then do a when, the published variable is innacessible

you have to do

first_task:
    action: "stuff_pack.do_stuff"
    input:
      stuff: "parameter"

    next:
      - when: "{{ succeeded() }}"
        publish:
          - stuff_result_stdout: <% result().stdout %>
        do:
          - "second_task"

and then on next task you can get ctx().stuff_result_stdout

I didn’t found much documentation about this context and when variables are accessible or not, which made me do a lot of trial and error.