diff --git a/plugins/os-context/prompts/session-start/10-orchestration.md b/plugins/os-context/prompts/session-start/10-orchestration.md
index a948a05..b4ed84d 100644
--- a/plugins/os-context/prompts/session-start/10-orchestration.md
+++ b/plugins/os-context/prompts/session-start/10-orchestration.md
@@ -16,12 +16,17 @@
   sequence (edits, lookups, conversions) needs no judgment between steps — this
   includes your own eval/benchmark/extraction work: repeated near-identical
   parsers, headless grid runs, and CLI syntax hunts are mechanical sequences too;
-  script once or delegate. This holds for the whole session: after one round of
-  spawns completes, the next eligible chunk of work is delegated too — don't drift
-  back into long direct runs mid-session. WHEN a design/decision settles
-  mid-session, stop before the first direct Write/Edit that implements it — the
-  resulting fan-out is a delegation event, even if the session started with
-  disciplined spawns.
+  script once or delegate. A red-green TDD loop over an already-specified fix
+  list is a single delegable unit — the internal test-driven sequencing is the
+  implementer's judgment, not the orchestrator's; put the failing-test list and
+  fix directions into the spawn prompt. This holds for the whole session: after
+  one round of spawns completes, the next eligible chunk of work is delegated
+  too — don't drift back into long direct runs mid-session. WHEN a
+  design/decision settles mid-session, stop before the first direct Write/Edit
+  that implements it — the resulting fan-out is a delegation event, even if the
+  session started with disciplined spawns. WHEN one or more review/diagnosis
+  agents return a confirmed defect list → implementing that list is a NEW
+  delegation decision, never a continuation of the main loop's review work.
 - Work directly when: the op is single-file or ≤2 tool calls; steps are genuinely
   judgment-dependent (each result changes what you do next); the user is in the
   loop every few turns (interactive troubleshooting — delegation overhead exceeds