diff --git a/.agent/harness/hooks/_provenance.py b/.agent/harness/hooks/_provenance.py
index 0228697..65a0b00 100644
--- a/.agent/harness/hooks/_provenance.py
+++ b/.agent/harness/hooks/_provenance.py
@@ -5,6 +5,7 @@
 
 _CACHED_COMMIT = None
 _CACHED_RUN_ID = None
+_CACHED_PROFILE = None
 
 
 def run_id():
@@ -14,6 +15,41 @@ def run_id():
     return _CACHED_RUN_ID
 
 
+def profile():
+    """Return the active harness profile name, or "default" when unknown.
+
+    Harnesses that run multiple isolated agent identities against the same
+    portable brain (e.g. Hermes's --profile flag spawning distinct
+    specialist agents) should set ``AGENT_PROFILE`` to the active name so
+    every episodic entry is tagged. Enables cross-profile clustering and
+    per-specialist retrospectives in the dream cycle.
+
+    Fallback detection covers known harnesses without code changes there:
+      * ``AGENT_PROFILE``  - canonical, any harness.
+      * ``HERMES_HOME``    - if it points under ``<...>/profiles/<name>``
+                             use that name; otherwise "default".
+    """
+    global _CACHED_PROFILE
+    if _CACHED_PROFILE is not None:
+        return _CACHED_PROFILE
+
+    explicit = os.environ.get("AGENT_PROFILE", "").strip()
+    if explicit:
+        _CACHED_PROFILE = explicit
+        return _CACHED_PROFILE
+
+    hermes_home = os.environ.get("HERMES_HOME", "").rstrip("/")
+    if hermes_home:
+        if "/profiles/" in hermes_home:
+            _CACHED_PROFILE = hermes_home.rsplit("/", 1)[-1]
+        else:
+            _CACHED_PROFILE = "default"
+        return _CACHED_PROFILE
+
+    _CACHED_PROFILE = "default"
+    return _CACHED_PROFILE
+
+
 def commit_sha():
     global _CACHED_COMMIT
     if _CACHED_COMMIT is None:
@@ -30,4 +66,9 @@ def commit_sha():
 
 
 def build_source(skill):
-    return {"skill": skill, "run_id": run_id(), "commit_sha": commit_sha()}
+    return {
+        "skill": skill,
+        "profile": profile(),
+        "run_id": run_id(),
+        "commit_sha": commit_sha(),
+    }