diff --git a/.agents/configs/fallback-chain-config.json.txt b/.agents/configs/fallback-chain-config.json.txt
index 41bdb7c51..ff575e89a 100644
--- a/.agents/configs/fallback-chain-config.json.txt
+++ b/.agents/configs/fallback-chain-config.json.txt
@@ -3,45 +3,36 @@
   "_docs": "See .agents/tools/ai-assistants/fallback-chains.md for full documentation",
 
   "chains": {
-    "_comment": "Per-tier fallback chains. Models tried in order. Only use providers configured in OpenCode (anthropic, google). Never use openrouter (expensive gateway).",
+    "_comment": "Per-tier fallback chains. Anthropic ONLY. Never use openrouter, openai, or google providers for worker dispatch.",
 
     "haiku": [
-      "anthropic/claude-haiku-4-5",
-      "google/gemini-2.5-flash"
+      "anthropic/claude-haiku-4-5"
     ],
     "flash": [
-      "google/gemini-2.5-flash",
       "anthropic/claude-haiku-4-5"
     ],
     "sonnet": [
-      "anthropic/claude-sonnet-4-5",
-      "google/gemini-2.5-pro"
+      "anthropic/claude-sonnet-4-5"
     ],
     "pro": [
-      "google/gemini-2.5-pro",
       "anthropic/claude-sonnet-4-5"
     ],
     "opus": [
-      "anthropic/claude-opus-4-6",
-      "google/gemini-2.5-pro"
+      "anthropic/claude-opus-4-6"
     ],
     "coding": [
       "anthropic/claude-opus-4-6",
-      "anthropic/claude-sonnet-4-5",
-      "google/gemini-2.5-pro"
+      "anthropic/claude-sonnet-4-5"
     ],
     "eval": [
-      "anthropic/claude-sonnet-4-5",
-      "google/gemini-2.5-flash"
+      "anthropic/claude-sonnet-4-5"
     ],
     "health": [
-      "anthropic/claude-sonnet-4-5",
-      "google/gemini-2.5-flash"
+      "anthropic/claude-sonnet-4-5"
     ],
 
     "default": [
-      "anthropic/claude-sonnet-4-5",
-      "google/gemini-2.5-pro"
+      "anthropic/claude-sonnet-4-5"
     ]
   },
 
diff --git a/.agents/scripts/fallback-chain-helper.sh b/.agents/scripts/fallback-chain-helper.sh
index 3ad4418e4..f8e6cba86 100755
--- a/.agents/scripts/fallback-chain-helper.sh
+++ b/.agents/scripts/fallback-chain-helper.sh
@@ -257,14 +257,14 @@ get_chain_for_tier() {
     # Use the existing model-availability-helper.sh tier mapping
     local tier_spec=""
     case "$tier" in
-        haiku)  tier_spec='["anthropic/claude-haiku-4-5","google/gemini-2.5-flash"]' ;;
-        flash)  tier_spec='["google/gemini-2.5-flash","anthropic/claude-haiku-4-5"]' ;;
-        sonnet) tier_spec='["anthropic/claude-sonnet-4-5","google/gemini-2.5-pro"]' ;;
-        pro)    tier_spec='["google/gemini-2.5-pro","anthropic/claude-sonnet-4-5"]' ;;
-        opus)   tier_spec='["anthropic/claude-opus-4-6","google/gemini-2.5-pro"]' ;;
-        coding) tier_spec='["anthropic/claude-opus-4-6","google/gemini-2.5-pro"]' ;;
-        eval)   tier_spec='["anthropic/claude-sonnet-4-5","google/gemini-2.5-flash"]' ;;
-        health) tier_spec='["anthropic/claude-sonnet-4-5","google/gemini-2.5-flash"]' ;;
+        haiku)  tier_spec='["anthropic/claude-haiku-4-5"]' ;;
+        flash)  tier_spec='["anthropic/claude-haiku-4-5"]' ;;
+        sonnet) tier_spec='["anthropic/claude-sonnet-4-5"]' ;;
+        pro)    tier_spec='["anthropic/claude-sonnet-4-5"]' ;;
+        opus)   tier_spec='["anthropic/claude-opus-4-6"]' ;;
+        coding) tier_spec='["anthropic/claude-opus-4-6","anthropic/claude-sonnet-4-5"]' ;;
+        eval)   tier_spec='["anthropic/claude-sonnet-4-5"]' ;;
+        health) tier_spec='["anthropic/claude-sonnet-4-5"]' ;;
         *)
             print_error "Unknown tier: $tier"
             return 1
diff --git a/.agents/scripts/supervisor-helper.sh b/.agents/scripts/supervisor-helper.sh
index 49bc990da..a80e58d6b 100755
--- a/.agents/scripts/supervisor-helper.sh
+++ b/.agents/scripts/supervisor-helper.sh
@@ -2817,14 +2817,11 @@ resolve_model() {
         sonnet|eval|health)
             echo "anthropic/claude-sonnet-4-5"
             ;;
-        haiku)
+        haiku|flash)
             echo "anthropic/claude-haiku-4-5"
             ;;
-        flash)
-            echo "google/gemini-2.5-flash"
-            ;;
         pro)
-            echo "google/gemini-2.5-pro"
+            echo "anthropic/claude-sonnet-4-5"
             ;;
         *)
             # Unknown tier — treat as coding tier default