diff --git a/assets/oh-my-opencode.schema.json b/assets/oh-my-opencode.schema.json
index e5ff4c3ed..bcc1f09bf 100644
--- a/assets/oh-my-opencode.schema.json
+++ b/assets/oh-my-opencode.schema.json
@@ -91,7 +91,8 @@
           "delegate-task-retry",
           "prometheus-md-only",
           "sisyphus-junior-notepad",
-          "sisyphus-gpt-hephaestus-reminder",
+          "no-sisyphus-gpt",
+          "no-hephaestus-non-gpt",
           "start-work",
           "atlas",
           "unstable-agent-babysitter",
@@ -99,10 +100,11 @@
           "task-resume-info",
           "stop-continuation-guard",
           "tasks-todowrite-disabler",
+          "runtime-fallback",
           "write-existing-file-guard",
           "anthropic-effort",
-          "runtime-fallback",
-          "hashline-read-enhancer"
+          "hashline-read-enhancer",
+          "hashline-edit-diff-enhancer"
         ]
       }
     },
@@ -127,6 +129,9 @@
         "type": "string"
       }
     },
+    "hashline_edit": {
+      "type": "boolean"
+    },
     "agents": {
       "type": "object",
       "properties": {
@@ -136,6 +141,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -300,18 +318,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -322,6 +339,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -486,18 +516,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -508,6 +537,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -672,18 +714,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -694,6 +735,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -858,18 +912,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -880,6 +933,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -1044,18 +1110,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -1066,6 +1131,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -1230,18 +1308,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -1252,6 +1329,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -1416,18 +1506,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -1438,6 +1527,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -1602,18 +1704,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -1624,6 +1725,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -1788,18 +1902,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -1810,6 +1923,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -1974,18 +2100,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -1996,6 +2121,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -2160,18 +2298,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -2182,6 +2319,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -2346,18 +2496,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -2368,6 +2517,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -2532,18 +2694,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -2554,6 +2715,19 @@
             "model": {
               "type": "string"
             },
+            "fallback_models": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "array",
+                  "items": {
+                    "type": "string"
+                  }
+                }
+              ]
+            },
             "variant": {
               "type": "string"
             },
@@ -2718,18 +2892,17 @@
               "type": "object",
               "additionalProperties": {}
             },
-            "fallback_models": {
-              "anyOf": [
-                {
+            "ultrawork": {
+              "type": "object",
+              "properties": {
+                "model": {
                   "type": "string"
                 },
-                {
-                  "type": "array",
-                  "items": {
-                    "type": "string"
-                  }
+                "variant": {
+                  "type": "string"
                 }
-              ]
+              },
+              "additionalProperties": false
             }
           },
           "additionalProperties": false
@@ -2748,6 +2921,19 @@
           "model": {
             "type": "string"
           },
+          "fallback_models": {
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "array",
+                "items": {
+                  "type": "string"
+                }
+              }
+            ]
+          },
           "variant": {
             "type": "string"
           },
@@ -2812,19 +2998,6 @@
           "is_unstable_agent": {
             "type": "boolean"
           },
-          "fallback_models": {
-            "anyOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "array",
-                "items": {
-                  "type": "string"
-                }
-              }
-            ]
-          },
           "disable": {
             "type": "boolean"
           }
@@ -3030,7 +3203,7 @@
         "safe_hook_creation": {
           "type": "boolean"
         },
-        "hashline_edit": {
+        "disable_omo_env": {
           "type": "boolean"
         }
       },
diff --git a/src/config/schema/oh-my-opencode-config.ts b/src/config/schema/oh-my-opencode-config.ts
index ddbbf7249..283d71a3f 100644
--- a/src/config/schema/oh-my-opencode-config.ts
+++ b/src/config/schema/oh-my-opencode-config.ts
@@ -54,7 +54,6 @@ export const OhMyOpenCodeConfigSchema = z.object({
   websearch: WebsearchConfigSchema.optional(),
   tmux: TmuxConfigSchema.optional(),
   sisyphus: SisyphusConfigSchema.optional(),
-  runtime_fallback: RuntimeFallbackConfigSchema.optional(),
   /** Migration history to prevent re-applying migrations (e.g., model version upgrades) */
   _migrations: z.array(z.string()).optional(),
 })
diff --git a/src/plugin/event.ts b/src/plugin/event.ts
index 56baa9875..41f7683e4 100644
--- a/src/plugin/event.ts
+++ b/src/plugin/event.ts
@@ -20,16 +20,20 @@ type FirstMessageVariantGate = {
   clear: (sessionID: string) => void
 }
 
+type EventInput = Parameters<
+  NonNullable<NonNullable<CreatedHooks["writeExistingFileGuard"]>["event"]>
+>[0]
+
 export function createEventHandler(args: {
   ctx: PluginContext
   pluginConfig: OhMyOpenCodeConfig
   firstMessageVariantGate: FirstMessageVariantGate
   managers: Managers
   hooks: CreatedHooks
-}): (input: { event: { type: string; properties?: Record<string, unknown> } }) => Promise<void> {
+}): (input: EventInput) => Promise<void> {
   const { ctx, firstMessageVariantGate, managers, hooks } = args
 
-  const dispatchToHooks = async (input: { event: { type: string; properties?: Record<string, unknown> } }): Promise<void> => {
+  const dispatchToHooks = async (input: EventInput): Promise<void> => {
     await Promise.resolve(hooks.autoUpdateChecker?.event?.(input))
     await Promise.resolve(hooks.claudeCodeHooks?.event?.(input))
     await Promise.resolve(hooks.backgroundNotificationHook?.event?.(input))
@@ -45,7 +49,7 @@ export function createEventHandler(args: {
     await Promise.resolve(hooks.runtimeFallback?.event?.(input))
     await Promise.resolve(hooks.agentUsageReminder?.event?.(input))
     await Promise.resolve(hooks.categorySkillReminder?.event?.(input))
-    await Promise.resolve(hooks.interactiveBashSession?.event?.(input))
+    await Promise.resolve(hooks.interactiveBashSession?.event?.(input as EventInput))
     await Promise.resolve(hooks.ralphLoop?.event?.(input))
     await Promise.resolve(hooks.stopContinuationGuard?.event?.(input))
     await Promise.resolve(hooks.compactionTodoPreserver?.event?.(input))
@@ -88,7 +92,7 @@ export function createEventHandler(args: {
         return
       }
       recentSyntheticIdles.set(sessionID, Date.now())
-      await dispatchToHooks(syntheticIdle)
+      await dispatchToHooks(syntheticIdle as EventInput)
     }
 
     const { event } = input
diff --git a/src/shared/model-resolver.ts b/src/shared/model-resolver.ts
index 9618b15ed..e2e02fce3 100644
--- a/src/shared/model-resolver.ts
+++ b/src/shared/model-resolver.ts
@@ -7,17 +7,6 @@ export type ModelResolutionInput = {
 	systemDefault?: string
 }
 
-/**
- * Normalizes fallback_models to an array.
- * Handles single string or array input, returns undefined for falsy values.
- */
-export function normalizeFallbackModels(
-	fallbackModels: string | string[] | undefined | null
-): string[] | undefined {
-	if (!fallbackModels) return undefined
-	return Array.isArray(fallbackModels) ? fallbackModels : [fallbackModels]
-}
-
 export type ModelSource =
 	| "override"
 	| "category-default"