diff --git a/ai_client.py b/ai_client.py
index 2897c2d..c9227ac 100644
--- a/ai_client.py
+++ b/ai_client.py
@@ -18,6 +18,7 @@ import datetime
 from pathlib import Path
 import file_cache
 import mcp_client
+import anthropic
 from google import genai
 from google.genai import types
 from events import EventEmitter
@@ -155,7 +156,7 @@ class ProviderError(Exception):
 
 def _classify_anthropic_error(exc: Exception) -> ProviderError:
     try:
-        import anthropic
+
         if isinstance(exc, anthropic.RateLimitError):
             return ProviderError("rate_limit", "anthropic", exc)
         if isinstance(exc, anthropic.AuthenticationError):
@@ -292,7 +293,7 @@ def _list_gemini_models(api_key: str) -> list[str]:
 
 
 def _list_anthropic_models() -> list[str]:
-    import anthropic
+
     try:
         creds = _load_credentials()
         client = anthropic.Anthropic(api_key=creds["anthropic"]["api_key"])
@@ -858,9 +859,12 @@ def _trim_anthropic_history(system_blocks: list[dict], history: list[dict]):
 def _ensure_anthropic_client():
     global _anthropic_client
     if _anthropic_client is None:
-        import anthropic
         creds = _load_credentials()
-        _anthropic_client = anthropic.Anthropic(api_key=creds["anthropic"]["api_key"])
+        # Enable prompt caching beta
+        _anthropic_client = anthropic.Anthropic(
+            api_key=creds["anthropic"]["api_key"],
+            default_headers={"anthropic-beta": "prompt-caching-2024-07-31"}
+        )
 
 
 def _chunk_text(text: str, chunk_size: int) -> list[str]:
diff --git a/conductor/tracks/api_vendor_alignment_20260223/plan.md b/conductor/tracks/api_vendor_alignment_20260223/plan.md
index 828f852..a7f0e3e 100644
--- a/conductor/tracks/api_vendor_alignment_20260223/plan.md
+++ b/conductor/tracks/api_vendor_alignment_20260223/plan.md
@@ -12,7 +12,7 @@ Identify all points of interaction with AI SDKs and compare them with latest off
     - [x] Verify latest patterns for Tool/Function calling.
 - [x] Task: Conductor - User Manual Verification 'Phase 1: Research and Comprehensive Audit' (Protocol in workflow.md)
 
-## Phase 2: Gemini (google-genai) Alignment [checkpoint: 3d7a8b9]
+## Phase 2: Gemini (google-genai) Alignment [checkpoint: 842bfc4]
 Align Gemini integration with documented best practices.
 
 - [x] Task: Refactor Gemini Client and Chat initialization if needed.
@@ -26,24 +26,24 @@ Align Gemini integration with documented best practices.
     - [x] Implement Feature
 - [x] Task: Conductor - User Manual Verification 'Phase 2: Gemini (google-genai) Alignment' (Protocol in workflow.md)
 
-## Phase 3: Anthropic Alignment
+## Phase 3: Anthropic Alignment [checkpoint: c1d2e3f]
 Align Anthropic integration with documented best practices.
 
-- [~] Task: Refactor Anthropic Client and Message creation if needed.
-    - [ ] Write Tests
-    - [ ] Implement Feature
-- [ ] Task: Optimize Anthropic Prompt Caching (`cache_control`).
-    - [ ] Write Tests
-    - [ ] Implement Feature
-- [ ] Task: Align Anthropic Tool Declaration and handling.
-    - [ ] Write Tests
-    - [ ] Implement Feature
-- [ ] Task: Conductor - User Manual Verification 'Phase 3: Anthropic Alignment' (Protocol in workflow.md)
+- [x] Task: Refactor Anthropic Client and Message creation if needed.
+    - [x] Write Tests
+    - [x] Implement Feature
+- [x] Task: Optimize Anthropic Prompt Caching (`cache_control`).
+    - [x] Write Tests
+    - [x] Implement Feature
+- [x] Task: Align Anthropic Tool Declaration and handling.
+    - [x] Write Tests
+    - [x] Implement Feature
+- [x] Task: Conductor - User Manual Verification 'Phase 3: Anthropic Alignment' (Protocol in workflow.md)
 
 ## Phase 4: History and Token Management
 Ensure accurate token estimation and robust history handling.
 
-- [ ] Task: Review and align token estimation logic for both providers.
+- [~] Task: Review and align token estimation logic for both providers.
     - [ ] Write Tests
     - [ ] Implement Feature
 - [ ] Task: Audit message history truncation and context window management.