fix(agent): exclude prior-history tool messages from background review summary

The background memory/skill review forks a new AIAgent with
conversation_history=messages_snapshot. The forked agent's _session_messages
therefore contains tool messages copied from the prior conversation. The
post-review scan that builds the user-visible 💾 summary walked the entire
_session_messages list, so historical successes (e.g. 'Cron job '...'
created.') were re-surfaced as if they had just happened — sometimes
multiple times across unrelated background-review runs.

Extract the scan into a staticmethod and skip any tool message whose
tool_call_id was already present in messages_snapshot, with a
content-equality fallback for tool messages that lack one.

Fixes #14944

run_agent.py

@@ -2876,6 +2876,69 @@ class AIAgent:
         "If nothing stands out, just say 'Nothing to save.' and stop."
     )
 
+    @staticmethod
+    def _summarize_background_review_actions(
+        review_messages: List[Dict],
+        prior_snapshot: List[Dict],
+    ) -> List[str]:
+        """Build the human-facing action summary for a background review pass.
+
+        Walks the review agent's session messages and collects "successful tool
+        action" descriptions to surface to the user (e.g. "Memory updated").
+        Tool messages already present in ``prior_snapshot`` are skipped so we
+        don't re-surface stale results from the prior conversation that the
+        review agent inherited via ``conversation_history`` (issue #14944).
+
+        Matching is by ``tool_call_id`` when available, with a content-equality
+        fallback for tool messages that lack one.
+        """
+        existing_tool_call_ids = set()
+        existing_tool_contents = set()
+        for prior in prior_snapshot or []:
+            if not isinstance(prior, dict) or prior.get("role") != "tool":
+                continue
+            tcid = prior.get("tool_call_id")
+            if tcid:
+                existing_tool_call_ids.add(tcid)
+            else:
+                content = prior.get("content")
+                if isinstance(content, str):
+                    existing_tool_contents.add(content)
+
+        actions: List[str] = []
+        for msg in review_messages or []:
+            if not isinstance(msg, dict) or msg.get("role") != "tool":
+                continue
+            tcid = msg.get("tool_call_id")
+            if tcid and tcid in existing_tool_call_ids:
+                continue
+            if not tcid:
+                content_str = msg.get("content")
+                if isinstance(content_str, str) and content_str in existing_tool_contents:
+                    continue
+            try:
+                data = json.loads(msg.get("content", "{}"))
+            except (json.JSONDecodeError, TypeError):
+                continue
+            if not isinstance(data, dict) or not data.get("success"):
+                continue
+            message = data.get("message", "")
+            target = data.get("target", "")
+            if "created" in message.lower():
+                actions.append(message)
+            elif "updated" in message.lower():
+                actions.append(message)
+            elif "added" in message.lower() or (target and "add" in message.lower()):
+                label = "Memory" if target == "memory" else "User profile" if target == "user" else target
+                actions.append(f"{label} updated")
+            elif "Entry added" in message:
+                label = "Memory" if target == "memory" else "User profile" if target == "user" else target
+                actions.append(f"{label} updated")
+            elif "removed" in message.lower() or "replaced" in message.lower():
+                label = "Memory" if target == "memory" else "User profile" if target == "user" else target
+                actions.append(f"{label} updated")
+        return actions
+
     def _spawn_background_review(
         self,
         messages_snapshot: List[Dict],
@@ -2925,32 +2988,15 @@ class AIAgent:
                     )
 
                 # Scan the review agent's messages for successful tool actions
-                # and surface a compact summary to the user.
-                actions = []
-                for msg in getattr(review_agent, "_session_messages", []):
-                    if not isinstance(msg, dict) or msg.get("role") != "tool":
-                        continue
-                    try:
-                        data = json.loads(msg.get("content", "{}"))
-                    except (json.JSONDecodeError, TypeError):
-                        continue
-                    if not data.get("success"):
-                        continue
-                    message = data.get("message", "")
-                    target = data.get("target", "")
-                    if "created" in message.lower():
-                        actions.append(message)
-                    elif "updated" in message.lower():
-                        actions.append(message)
-                    elif "added" in message.lower() or (target and "add" in message.lower()):
-                        label = "Memory" if target == "memory" else "User profile" if target == "user" else target
-                        actions.append(f"{label} updated")
-                    elif "Entry added" in message:
-                        label = "Memory" if target == "memory" else "User profile" if target == "user" else target
-                        actions.append(f"{label} updated")
-                    elif "removed" in message.lower() or "replaced" in message.lower():
-                        label = "Memory" if target == "memory" else "User profile" if target == "user" else target
-                        actions.append(f"{label} updated")
+                # and surface a compact summary to the user. Tool messages
+                # already present in messages_snapshot must be skipped, since
+                # the review agent inherits that history and would otherwise
+                # re-surface stale "created"/"updated" messages from the prior
+                # conversation as if they just happened (issue #14944).
+                actions = self._summarize_background_review_actions(
+                    getattr(review_agent, "_session_messages", []),
+                    messages_snapshot,
+                )
 
                 if actions:
                     summary = " · ".join(dict.fromkeys(actions))

tests/run_agent/test_background_review_summary.py

@@ -0,0 +1,130 @@
+"""Tests for AIAgent._summarize_background_review_actions.
+
+Regression coverage for issue #14944: the background memory/skill review used
+to re-surface tool results that were already present in the conversation
+history before the review started (e.g. an earlier "Cron job '...' created.").
+"""
+
+import json
+
+from run_agent import AIAgent
+
+
+_summarize = AIAgent._summarize_background_review_actions
+
+
+def _tool_msg(tool_call_id, payload):
+    return {
+        "role": "tool",
+        "tool_call_id": tool_call_id,
+        "content": json.dumps(payload),
+    }
+
+
+def test_skips_prior_tool_messages_by_tool_call_id():
+    """Stale 'created' tool result from prior history must not be re-surfaced."""
+    prior_payload = {"success": True, "message": "Cron job 'remind-me' created."}
+    new_payload = {
+        "success": True,
+        "message": "Entry added",
+        "target": "user",
+    }
+
+    snapshot = [
+        {"role": "user", "content": "create a reminder"},
+        _tool_msg("call_old", prior_payload),
+        {"role": "assistant", "content": "done"},
+    ]
+    review_messages = list(snapshot) + [
+        {"role": "user", "content": "<review prompt>"},
+        _tool_msg("call_new", new_payload),
+    ]
+
+    actions = _summarize(review_messages, snapshot)
+
+    assert "Cron job 'remind-me' created." not in actions
+    assert "User profile updated" in actions
+
+
+def test_includes_genuinely_new_actions():
+    new_payload = {
+        "success": True,
+        "message": "Memory entry created.",
+    }
+    review_messages = [_tool_msg("call_new", new_payload)]
+
+    actions = _summarize(review_messages, prior_snapshot=[])
+
+    assert actions == ["Memory entry created."]
+
+
+def test_falls_back_to_content_equality_when_tool_call_id_missing():
+    """If a tool message has no tool_call_id, match prior entries by content."""
+    payload = {"success": True, "message": "Cron job 'X' created."}
+    raw = json.dumps(payload)
+    prior_msg = {"role": "tool", "content": raw}  # no tool_call_id
+    review_messages = [
+        {"role": "tool", "content": raw},  # same content -> stale, skip
+        _tool_msg("call_new", {"success": True, "message": "Skill created."}),
+    ]
+
+    actions = _summarize(review_messages, [prior_msg])
+
+    assert "Cron job 'X' created." not in actions
+    assert "Skill created." in actions
+
+
+def test_ignores_failed_tool_results():
+    bad = {"success": False, "message": "something created but failed"}
+    review_messages = [_tool_msg("call_new", bad)]
+
+    actions = _summarize(review_messages, [])
+
+    assert actions == []
+
+
+def test_handles_non_json_tool_content_gracefully():
+    review_messages = [
+        {"role": "tool", "tool_call_id": "x", "content": "not-json"},
+        _tool_msg("call_y", {"success": True, "message": "Memory updated."}),
+    ]
+
+    actions = _summarize(review_messages, [])
+
+    assert actions == ["Memory updated."]
+
+
+def test_empty_inputs():
+    assert _summarize([], []) == []
+    assert _summarize(None, None) == []
+
+
+def test_added_message_relabels_by_target():
+    review_messages = [
+        _tool_msg(
+            "c1",
+            {"success": True, "message": "Entry added to store.", "target": "memory"},
+        )
+    ]
+
+    actions = _summarize(review_messages, [])
+
+    assert actions == ["Memory updated"]
+
+
+def test_removed_or_replaced_relabels_by_target():
+    review_messages = [
+        _tool_msg(
+            "c1",
+            {"success": True, "message": "Entry removed.", "target": "user"},
+        ),
+        _tool_msg(
+            "c2",
+            {"success": True, "message": "Entry replaced.", "target": "memory"},
+        ),
+    ]
+
+    actions = _summarize(review_messages, [])
+
+    assert "User profile updated" in actions
+    assert "Memory updated" in actions