diff --git a/src/soul_protocol/spec/decisions.py b/src/soul_protocol/spec/decisions.py
index 969e78b..5afa3ad 100644
--- a/src/soul_protocol/spec/decisions.py
+++ b/src/soul_protocol/spec/decisions.py
@@ -1,4 +1,9 @@
 # decisions.py — Decision trace payload types and helpers for the Org Journal.
+# Updated: feat/rfc07-decision-outcome-attached — extend the
+# ``trace_decision_chain`` decision-action filter to include
+# ``decision.outcome_attached`` so post-close outcome mutations
+# (introduced by RFC 07) surface in the trace alongside the chain
+# proper.
 # Created: feat/decision-traces — Workstream D of the Org Architecture RFC (PR #164).
 #
 # Every agent proposal a human edits or rejects becomes a structured, auditable
@@ -211,7 +216,15 @@ def trace_decision_chain(journal, correlation_id: UUID) -> list[EventEntry]:
     the same correlation_id are filtered out.
     """
     events = journal.query(correlation_id=correlation_id, limit=10_000)
-    decision_actions = {"agent.proposed", "human.corrected", "decision.graduated"}
+    decision_actions = {
+        "agent.proposed",
+        "human.corrected",
+        "decision.graduated",
+        # RFC 07: outcome-attachment events update an already-emitted
+        # Decision's outcome and belong in the chain so traces surface
+        # the full lifecycle, including post-close mutations.
+        "decision.outcome_attached",
+    }
     chain = [e for e in events if e.action in decision_actions]
     chain.sort(key=lambda e: e.ts)
     return chain
diff --git a/src/soul_protocol/spec/journal.py b/src/soul_protocol/spec/journal.py
index b0aed20..8795117 100644
--- a/src/soul_protocol/spec/journal.py
+++ b/src/soul_protocol/spec/journal.py
@@ -1,4 +1,10 @@
 # journal.py — Org Journal primitives (Actor, DataRef, EventEntry).
+# Updated: feat/rfc07-decision-outcome-attached — register
+# ``decision.outcome_attached`` in ACTION_NAMESPACES. RFC 07 introduces
+# this action as a projection-update event that mutates a Decision's
+# outcome after first emit. The hash chain excludes ``outcome``, which
+# is what makes the mutation safe; this is the only spec action that
+# mutates a prior projection record.
 # Updated: feat/0.3.2-spike — add EventEntry.seq (backend-assigned, None until
 # committed). Journal.append now returns the committed EventEntry so callers
 # can thread seq through idempotency/pagination without racing MAX(seq) or
@@ -100,6 +106,12 @@ def _encode_bytes(v: bytes | None) -> str | None:
     "agent.proposed",
     "human.corrected",
     "decision.graduated",
+    # RFC 07 (Decision Graph Query Layer): projection-update event that
+    # mutates an already-emitted Decision's ``outcome`` field after the
+    # chain has closed. The hash chain excludes ``outcome``, so this
+    # post-hoc update is safe — it is the only event in the spec that
+    # mutates a prior projection record.
+    "decision.outcome_attached",
     # Credentials & Zero-Copy
     "credential.acquired",
     "credential.used",
diff --git a/tests/test_spec/test_decisions.py b/tests/test_spec/test_decisions.py
index 10102fd..3623483 100644
--- a/tests/test_spec/test_decisions.py
+++ b/tests/test_spec/test_decisions.py
@@ -152,6 +152,10 @@ def test_namespaces_include_decision_actions():
     assert "agent.proposed" in ACTION_NAMESPACES
     assert "human.corrected" in ACTION_NAMESPACES
     assert "decision.graduated" in ACTION_NAMESPACES
+    # RFC 07 — projection-update event that mutates an already-emitted
+    # Decision's outcome field. Registered additively in the journal's
+    # action catalog so the chain projection can recognize it.
+    assert "decision.outcome_attached" in ACTION_NAMESPACES
 
 
 def test_build_proposal_event_shape(drafter: Actor):