diff --git a/.changeset/export-anon-function-tool.md b/.changeset/export-anon-function-tool.md
new file mode 100644
index 000000000..de8347601
--- /dev/null
+++ b/.changeset/export-anon-function-tool.md
@@ -0,0 +1,5 @@
+---
+'@livekit/agents': patch
+---
+
+Export the `AnonFunctionTool` type so callers can annotate return types for name-less `tool()` factories used in object-map tool registration.
diff --git a/agents/src/llm/index.ts b/agents/src/llm/index.ts
index 4773501dc..721fb0395 100644
--- a/agents/src/llm/index.ts
+++ b/agents/src/llm/index.ts
@@ -18,6 +18,7 @@ export {
   Toolset,
   toToolContext,
   type AgentHandoff,
+  type AnonFunctionTool,
   type DuplicateMode,
   type FunctionTool,
   type Tool,
diff --git a/agents/src/llm/tool_context.ts b/agents/src/llm/tool_context.ts
index 6b947a021..215ea7f4f 100644
--- a/agents/src/llm/tool_context.ts
+++ b/agents/src/llm/tool_context.ts
@@ -223,6 +223,10 @@ export interface FunctionTool<
   [FUNCTION_TOOL_SYMBOL]: true;
 }
 
+/**
+ * A function tool without `id`/`name`. Returned by {@link tool} when `name` is omitted; the
+ * containing object key supplies the name when registered via an object-map tool definition.
+ */
 export type AnonFunctionTool<
   Parameters extends JSONObject = JSONObject,
   UserData = UnknownUserData,