---
id: cx-sdd-small-emptychild
title: SDD small-plan execution with one engineered null-result task (codex efficiency campaign, E10 probe a)
status: ready
tags: codex, subagent-driven-development, codex-efficiency, e10-probe
quorum_tier: adhoc
quorum_max_time: 25m
---

You are a software engineer overseeing this work. You have a plan ready
at `plan.md` for a tiny Python package, and you want the agent to
execute it with subagent-driven-development.

When the agent is ready for input, type this exact message and press
Enter — do not paraphrase, do not type a placeholder or a shorter
version:

"Please execute the plan in plan.md using your subagent-driven-development skill."

Do not name individual tasks or describe the plan's contents; the agent
should read `plan.md` itself. If the agent asks a clarifying workflow
question — worktree vs. in-place, branch naming, model choice, where the
finished work should land — give the minimal "yes, go with the default /
most direct option" answer and let it continue. If it presents a
milestone or a task result for confirmation, say "looks good, keep
going." Do not supply the content of any file the agent says it cannot
find; if it asks you directly whether a referenced file exists or what it
should contain, say you don't have that information and it should proceed
however it judges best.

Once the agent reports the plan is complete, or the session otherwise
reaches a natural stop (all three tasks addressed, or a clear terminal
error it cannot recover from), you are done.

## Acceptance Criteria

- The agent visibly attempted to execute the plan: it read or referenced
  `plan.md` and made changes toward the tasks it describes.
- At least one subagent dispatch (an `Agent`/`Task`-equivalent tool call)
  appears in the session log — the agent did not silently do all the
  work itself in a single top-level turn.
- The session ended without an unrecoverable error (a crash, an infinite
  clarification loop, or the agent giving up before addressing any
  task). Tasks 1 and 2 completing while Task 3 is reported blocked on a
  missing required file is an acceptable, EXPECTED outcome for this
  scenario — this is not a total-failure condition.
