diff --git a/session/changes.md b/session/changes.md
new file mode 100644
index 0000000..e69de29
diff --git a/tools/engine.py b/tools/engine.py
index 677d8f3..3c5e0c1 100644
--- a/tools/engine.py
+++ b/tools/engine.py
@@ -31,6 +31,7 @@ AMBIENCE_PATH = SESSION_DIR / 'ambience.md'
 LOG_DIR = SESSION_DIR / 'log'
 LLM_LOG_PATH = SESSION_DIR / 'llm.log'
 AMBIENCE_OPTIONS_PATH = SESSION_DIR / "ambience_options.md"
+CHANGES_PATH = SESSION_DIR / "changes.md"
 AUDIO_DIR = SESSION_DIR / "audio"
 TODAY = date.today().isoformat()
 
@@ -59,6 +60,7 @@ class TurnResult:
     log_entry: Optional[str] = None
     error: Optional[str] = None
     debug_info: str = ""
+    changes: list[str] = field(default_factory=list)
 
 
 # ── DM System Prompt Template ──────────────────────────────────────────────
@@ -653,6 +655,42 @@ class GameEngine:
             desc = f"using {tool_name}"
         return f"DM is {desc}..."
 
+    @staticmethod
+    def _describe_change(tool_name: str, args: dict) -> str:
+        """Build a compact human-readable change description from a tool call."""
+        if tool_name == "modify_vitals":
+            parts = []
+            for k, v in args.items():
+                label = k.replace("_", " ").title()
+                parts.append(f"{label}: {v}")
+            return f"⚡ {', '.join(parts)}" if parts else ""
+        elif tool_name == "modify_traits":
+            parts = []
+            for k, v in args.items():
+                parts.append(f"{k.upper()}: {v}")
+            return f"⚡ {', '.join(parts)}"
+        elif tool_name == "add_to_inventory":
+            return f"+ {args.get('item', '?')}"
+        elif tool_name == "remove_from_inventory":
+            return f"− {args.get('item', '?')}"
+        elif tool_name == "replace_gear":
+            return f"↻ {args.get('before', '?')} → {args.get('after', '?')}"
+        elif tool_name == "add_note":
+            note = args.get("note", "?")
+            return f"📝 {note[:60]}{'…' if len(note) > 60 else ''}"
+        elif tool_name == "replace_note":
+            return f"📝 {args.get('before', '?')[:40]} → {args.get('after', '?')[:40]}"
+        elif tool_name == "world_update":
+            return "🌍 World updated"
+        elif tool_name == "journal_update":
+            parts = []
+            for a in args.get("add", []):
+                parts.append(f"📋 {a}")
+            for d in args.get("done", []):
+                parts.append(f"✅ {d}")
+            return "; ".join(parts) if parts else ""
+        return ""
+
     def _execute_tool(self, tool_name: str, args: dict) -> str:
         fn_map = {
             "roll": self._tool_roll,
@@ -815,6 +853,7 @@ class GameEngine:
         user_prompt = self._auto_prompt("")
         ambience = None
         debug_info = ""
+        changes = []
 
         for outer_attempt in range(3):
             # ── Phase 1: Prose ────────────────────────────────────────────
@@ -969,6 +1008,7 @@ class GameEngine:
                     on_debug("phase", {"phase": 3, "status": "tools_found", "tools": names, "has_finalize": fin})
 
                 errors = []
+                attempt_changes = []
                 for tc in tool_calls:
                     name = tc.get("tool", "?")
                     args = tc.get("args", {})
@@ -993,12 +1033,17 @@ class GameEngine:
 
                     if result.startswith("**Error:") or result.startswith("Tool error") or result.startswith("Unknown"):
                         errors.append(f"{name}: {result}")
+                    else:
+                        desc = self._describe_change(name, args)
+                        if desc:
+                            attempt_changes.append(desc)
                     if on_debug:
                         on_debug("tool_result", {"round": p3_attempt + 1, "tool": name, "result": result})
 
                 if not errors:
                     phase3_ok = True
                     debug_info = ""
+                    changes = attempt_changes
                     if on_debug:
                         on_debug("phase", {"phase": 3, "status": "done", "applied": len([tc for tc in tool_calls if tc.get("tool") != "finalize_turn"])})
                     break
@@ -1053,6 +1098,7 @@ class GameEngine:
             user_prompt=user_prompt,
             ambience=ambience,
             debug_info=debug_info,
+            changes=changes,
         )
 
     @staticmethod
@@ -1206,6 +1252,10 @@ class GameEngine:
         """Write state changes from a TurnResult to disk."""
         if result.ambience:
             AMBIENCE_PATH.write_text(result.ambience.strip().lower() + "\n")
+        if result.changes:
+            CHANGES_PATH.write_text("\n".join(result.changes) + "\n")
+        else:
+            CHANGES_PATH.write_text("")
 
     def archive_turn(self, narrative: str) -> None:
         """Append the narrative as a new turn in book.md."""
diff --git a/tools/run.py b/tools/run.py
index ff290b6..7f49596 100755
--- a/tools/run.py
+++ b/tools/run.py
@@ -46,6 +46,7 @@ AMBIENCE_PATH = SESSION / 'ambience.md'
 AMBIENCE_OPTIONS_PATH = SESSION / 'ambience_options.md'
 BOOK_PATH = SESSION / 'book.md'
 LAST_PROMPT_PATH = SESSION / 'last_prompt.md'
+CHANGES_PATH = SESSION / 'changes.md'
 AUDIO_DIR = SESSION / 'audio'
 TODAY = date.today().isoformat()
 LOG_PATH = LOG_DIR / f'{TODAY}.md'
@@ -697,6 +698,11 @@ class ChaosTUI(App):
                 parts = []
                 if pages:
                     parts.append(pages[-1])
+                if CHANGES_PATH.exists():
+                    changes = [l for l in CHANGES_PATH.read_text().splitlines() if l.strip()]
+                    if changes:
+                        changes_text = "\n".join(f"> {c}" for c in changes)
+                        parts.append(f"> **Last turn changes:**\n{changes_text}")
                 parts.append(f"---\n\n{saved}")
                 self._set_narrative("\n\n".join(parts))
                 self._enable_input()
@@ -987,6 +993,9 @@ class ChaosTUI(App):
         parts = []
         if result.book_log:
             parts.append(result.book_log)
+        if result.changes:
+            changes_text = "\n".join(f"> {c}" for c in result.changes)
+            parts.append(f"> **Changes:**\n{changes_text}")
         if result.user_prompt:
             parts.append(f"---\n\n{result.user_prompt}")
         self._set_narrative("\n\n".join(parts) if parts else "")