feat(plugins): expose llm input/output hook payloads (openclaw#16724) thanks @SecondThread

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: SecondThread <18317476+SecondThread@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/plugins/types.ts

@@ -297,6 +297,8 @@ export type PluginDiagnostic = {
 
 export type PluginHookName =
   | "before_agent_start"
+  | "llm_input"
+  | "llm_output"
   | "agent_end"
   | "before_compaction"
   | "after_compaction"
@@ -332,6 +334,35 @@ export type PluginHookBeforeAgentStartResult = {
   prependContext?: string;
 };
 
+// llm_input hook
+export type PluginHookLlmInputEvent = {
+  runId: string;
+  sessionId: string;
+  provider: string;
+  model: string;
+  systemPrompt?: string;
+  prompt: string;
+  historyMessages: unknown[];
+  imagesCount: number;
+};
+
+// llm_output hook
+export type PluginHookLlmOutputEvent = {
+  runId: string;
+  sessionId: string;
+  provider: string;
+  model: string;
+  assistantTexts: string[];
+  lastAssistant?: unknown;
+  usage?: {
+    input?: number;
+    output?: number;
+    cacheRead?: number;
+    cacheWrite?: number;
+    total?: number;
+  };
+};
+
 // agent_end hook
 export type PluginHookAgentEndEvent = {
   messages: unknown[];
@@ -498,6 +529,11 @@ export type PluginHookHandlerMap = {
     event: PluginHookBeforeAgentStartEvent,
     ctx: PluginHookAgentContext,
   ) => Promise<PluginHookBeforeAgentStartResult | void> | PluginHookBeforeAgentStartResult | void;
+  llm_input: (event: PluginHookLlmInputEvent, ctx: PluginHookAgentContext) => Promise<void> | void;
+  llm_output: (
+    event: PluginHookLlmOutputEvent,
+    ctx: PluginHookAgentContext,
+  ) => Promise<void> | void;
   agent_end: (event: PluginHookAgentEndEvent, ctx: PluginHookAgentContext) => Promise<void> | void;
   before_compaction: (
     event: PluginHookBeforeCompactionEvent,