diff --git a/conductor/tracks/send_result_to_send_20260616/plan.md b/conductor/tracks/send_result_to_send_20260616/plan.md
index 08766839..57d654f9 100644
--- a/conductor/tracks/send_result_to_send_20260616/plan.md
+++ b/conductor/tracks/send_result_to_send_20260616/plan.md
@@ -123,14 +123,14 @@ Verify: 10 references in `src/ai_client.py` are renamed; test suite is in the ex
 - Modify: `src/multi_agent_conductor.py` (2 refs: 1 call + 1 print)
 - Modify: `src/orchestrator_pm.py` (2 refs: 1 call + 1 print)
 
-### Task 2.1: Rename in the 5 other src/ files (single batch commit)
+### Task 2.1: Rename in the 5 other src/ files (single batch commit) [d87d909]
 
-- [ ] **Step 1: Identify all references in the 5 files**
+- [x] **Step 1: Identify all references in the 5 files**
 
 Run: `git grep -n "send_result" -- src/app_controller.py src/conductor_tech_lead.py src/mcp_client.py src/multi_agent_conductor.py src/orchestrator_pm.py`
 Expected: 10 lines total (2 + 3 + 1 + 2 + 2 = 10).
 
-- [ ] **Step 2: Rename each reference**
+- [x] **Step 2: Rename each reference**
 
 For each of the 10 references:
 - `ai_client.send_result(...)` → `ai_client.send(...)` (call sites)
@@ -144,12 +144,12 @@ Use the MCP edit tool. Special attention:
 Verify: `git grep "send_result" -- src/app_controller.py src/conductor_tech_lead.py src/mcp_client.py src/multi_agent_conductor.py src/orchestrator_pm.py`
 Expected: 0 matches.
 
-- [ ] **Step 3: Run the test suite — confirm partial green**
+- [x] **Step 3: Run the test suite — confirm partial green**
 
 Run: `uv run pytest 2>&1 | tail -3`
 Expected: still many failures, but fewer than Phase 1. The remaining failures are in test files (which still mock `send_result`).
 
-- [ ] **Step 4: Commit**
+- [x] **Step 4: Commit**
 
 ```bash
 git add src/app_controller.py src/conductor_tech_lead.py src/mcp_client.py src/multi_agent_conductor.py src/orchestrator_pm.py
@@ -165,7 +165,7 @@ that still reference send_result).
 Refs: conductor/tracks/send_result_to_send_20260616/"
 ```
 
-- [ ] **Step 5: Attach the git note**
+- [x] **Step 5: Attach the git note**
 
 ```bash
 git notes add -m "Task 2.1: rename in 5 other src/ files (batch)
diff --git a/scripts/tier2/update_plan_t2_1.py b/scripts/tier2/update_plan_t2_1.py
new file mode 100644
index 00000000..8ebdfd52
--- /dev/null
+++ b/scripts/tier2/update_plan_t2_1.py
@@ -0,0 +1,46 @@
+"""Update plan.md to mark Task 2.1 as complete with commit SHA."""
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+
+PLAN = Path("conductor/tracks/send_result_to_send_20260616/plan.md")
+SHA = "d87d909"
+
+EDITS: list[tuple[str, str]] = [
+ (
+  "### Task 2.1: Rename in the 5 other src/ files (single batch commit)\n\n- [ ] **Step 1: Identify all references in the 5 files**",
+  f"### Task 2.1: Rename in the 5 other src/ files (single batch commit) [{SHA}]\n\n- [x] **Step 1: Identify all references in the 5 files**",
+ ),
+ ("- [ ] **Step 2: Rename each reference**", "- [x] **Step 2: Rename each reference**"),
+ ("- [ ] **Step 3: Run the test suite — confirm partial green**", "- [x] **Step 3: Run the test suite — confirm partial green**"),
+ ("- [ ] **Step 4: Commit**", "- [x] **Step 4: Commit**"),
+ ("- [ ] **Step 5: Attach the git note**", "- [x] **Step 5: Attach the git note**"),
+]
+
+
+def main() -> int:
+ with PLAN.open("r", encoding="utf-8", newline="") as f:
+  content = f.read()
+ has_crlf = "\r\n" in content
+ nl = "\r\n" if has_crlf else "\n"
+ normalized = [(o.replace("\n", nl), n.replace("\n", nl)) for o, n in EDITS]
+ new_content = content
+ applied = 0
+ for old, new in normalized:
+  if old in new_content:
+   new_content = new_content.replace(old, new, 1)
+   applied += 1
+  else:
+   print(f"NOT FOUND: {old[:80]!r}", file=sys.stderr)
+ if applied != len(EDITS):
+  print(f"Only applied {applied}/{len(EDITS)} edits.", file=sys.stderr)
+  return 1
+ with PLAN.open("w", encoding="utf-8", newline="") as f:
+  f.write(new_content)
+ print(f"Applied {applied}/{len(EDITS)} edits. Line endings: {'CRLF' if has_crlf else 'LF'}")
+ return 0
+
+
+if __name__ == "__main__":
+ raise SystemExit(main())