diff --git a/src/converters/claude-to-opencode.ts b/src/converters/claude-to-opencode.ts
index ad8cc00..5e3cf71 100644
--- a/src/converters/claude-to-opencode.ts
+++ b/src/converters/claude-to-opencode.ts
@@ -209,9 +209,11 @@ function renderHookStatements(
 ): string[] {
   if (!matcher.hooks || matcher.hooks.length === 0) return []
   const tools = matcher.matcher
-    .split("|")
-    .map((tool) => tool.trim().toLowerCase())
-    .filter(Boolean)
+    ? matcher.matcher
+        .split("|")
+        .map((tool) => tool.trim().toLowerCase())
+        .filter(Boolean)
+    : []
 
   const useMatcher = useToolMatcher && tools.length > 0 && !tools.includes("*")
   const condition = useMatcher
@@ -232,10 +234,10 @@ function renderHookStatements(
       continue
     }
     if (hook.type === "prompt") {
-      statements.push(`// Prompt hook for ${matcher.matcher}: ${hook.prompt.replace(/\n/g, " ")}`)
+      statements.push(`// Prompt hook for ${matcher.matcher ?? "*"}: ${hook.prompt.replace(/\n/g, " ")}`)
       continue
     }
-    statements.push(`// Agent hook for ${matcher.matcher}: ${hook.agent}`)
+    statements.push(`// Agent hook for ${matcher.matcher ?? "*"}: ${hook.agent}`)
   }
 
   return statements
diff --git a/src/types/claude.ts b/src/types/claude.ts
index 4b1c050..a878274 100644
--- a/src/types/claude.ts
+++ b/src/types/claude.ts
@@ -79,7 +79,7 @@ export type ClaudeHookAgent = {
 export type ClaudeHookEntry = ClaudeHookCommand | ClaudeHookPrompt | ClaudeHookAgent
 
 export type ClaudeHookMatcher = {
-  matcher: string
+  matcher?: string
   hooks: ClaudeHookEntry[]
 }