diff --git a/conductor/tracks/on_demand_def_lookup_20260306/plan.md b/conductor/tracks/on_demand_def_lookup_20260306/plan.md
index 467b98d..83c127a 100644
--- a/conductor/tracks/on_demand_def_lookup_20260306/plan.md
+++ b/conductor/tracks/on_demand_def_lookup_20260306/plan.md
@@ -33,35 +33,17 @@ Focus: Use existing MCP tool to get definitions
        return None
       ```
 
-## Phase 3: Inline Display
+## Phase 3: Inline Display [checkpoint: 7ea833e]
 Focus: Display definition in discussion
 
-- [~] Task 3.1: Inject definition as context
-    - WHERE: `src/gui_2.py` `_send_callback()`
-    - WHAT: Append definition to message
-    - HOW:
-      ```python
-      symbols = parse_symbols(user_message)
-      for symbol in symbols:
-       result = get_symbol_definition(symbol, self.project_files)
-       if result:
-        file_path, definition = result
-        user_message += f"\n\n[Definition: {symbol} from {file_path}]\n```python\n{definition}\n```"
-      ```
+- [x] Task 3.1: Inject definition as context (7ea833e)
 
-## Phase 4: Click Navigation
+## Phase 4: Click Navigation [checkpoint: 7ea833e]
 Focus: Allow clicking definition to open file
 
-- [ ] Task 4.1: Store file/line metadata with definition
-    - WHERE: Discussion entry structure
-    - WHAT: Track source location
-    - HOW: Add to discussion entry dict
+- [x] Task 4.1: Store file/line metadata with definition (7ea833e)
+- [x] Task 4.2: Add click handler (7ea833e)
 
-- [ ] Task 4.2: Add click handler
-    - WHERE: `src/gui_2.py` discussion rendering
-    - WHAT: On click, scroll to definition
-    - HOW: Use selectable text with callback
-
-## Phase 5: Testing
-- [ ] Task 5.1: Write unit tests for parsing
-- [ ] Task 5.2: Conductor - Phase Verification
+## Phase 5: Testing [checkpoint: 7ea833e]
+- [x] Task 5.1: Write unit tests for parsing (7ea833e)
+- [x] Task 5.2: Conductor - Phase Verification (7ea833e)