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diff --git a/Omni/Agent/Core.hs b/Omni/Agent/Core.hs
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+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE NoImplicitPrelude #-}
+
+module Omni.Agent.Core where
+
+import Alpha
+import Data.Aeson (FromJSON, ToJSON)
+
+-- | Engine/provider selection for agent
+data EngineType
+  = EngineOpenRouter
+  | EngineOllama
+  | EngineAmp
+  deriving (Show, Eq, Generic)
+
+instance ToJSON EngineType
+
+instance FromJSON EngineType
+
+-- | Status of a worker agent
+data WorkerStatus
+  = Idle
+  | Syncing
+  | -- | Task ID
+    Working Text
+  | -- | Task ID
+    Submitting Text
+  | -- | Error message
+    Error Text
+  deriving (Show, Eq, Generic)
+
+instance ToJSON WorkerStatus
+
+instance FromJSON WorkerStatus
+
+-- | Representation of a worker agent
+data Worker = Worker
+  { workerName :: Text,
+    workerPid :: Maybe Int,
+    workerStatus :: WorkerStatus,
+    workerPath :: FilePath,
+    workerQuiet :: Bool, -- Disable ANSI status bar (for loop mode)
+    workerEngine :: EngineType -- Which LLM backend to use
+  }
+  deriving (Show, Eq, Generic)
+
+instance ToJSON Worker
+
+instance FromJSON Worker