diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
index 8929fdbdc4..db55fcc7b8 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
@@ -1710,8 +1710,8 @@ function Read(props: ToolProps<typeof ReadTool>) {
     if (props.part.state.status !== "completed") return []
     if (props.part.state.time.compacted) return []
     const value = props.metadata.loaded
-    if (!value) return []
-    return Array.isArray(value) ? value : [value]
+    if (!value || !Array.isArray(value)) return []
+    return value.filter((p): p is string => typeof p === "string")
   })
   return (
     <>
diff --git a/packages/opencode/src/session/instruction.ts b/packages/opencode/src/session/instruction.ts
index 7ea65e86c2..d413e80f69 100644
--- a/packages/opencode/src/session/instruction.ts
+++ b/packages/opencode/src/session/instruction.ts
@@ -120,11 +120,9 @@ export namespace InstructionPrompt {
         if (part.type === "tool" && part.tool === "read" && part.state.status === "completed") {
           if (part.state.time.compacted) continue
           const loaded = part.state.metadata?.loaded
-          if (!loaded) continue
-          if (Array.isArray(loaded)) {
-            loaded.forEach((p) => paths.add(p))
-          } else {
-            paths.add(loaded)
+          if (!loaded || !Array.isArray(loaded)) continue
+          for (const p of loaded) {
+            if (typeof p === "string") paths.add(p)
           }
         }
       }