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/hooks.ts

@@ -14,6 +14,8 @@ import type {
   PluginHookBeforeAgentStartEvent,
   PluginHookBeforeAgentStartResult,
   PluginHookBeforeCompactionEvent,
+  PluginHookLlmInputEvent,
+  PluginHookLlmOutputEvent,
   PluginHookBeforeResetEvent,
   PluginHookBeforeToolCallEvent,
   PluginHookBeforeToolCallResult,
@@ -41,6 +43,8 @@ export type {
   PluginHookAgentContext,
   PluginHookBeforeAgentStartEvent,
   PluginHookBeforeAgentStartResult,
+  PluginHookLlmInputEvent,
+  PluginHookLlmOutputEvent,
   PluginHookAgentEndEvent,
   PluginHookBeforeCompactionEvent,
   PluginHookBeforeResetEvent,
@@ -212,6 +216,24 @@ export function createHookRunner(registry: PluginRegistry, options: HookRunnerOp
     return runVoidHook("agent_end", event, ctx);
   }
 
+  /**
+   * Run llm_input hook.
+   * Allows plugins to observe the exact input payload sent to the LLM.
+   * Runs in parallel (fire-and-forget).
+   */
+  async function runLlmInput(event: PluginHookLlmInputEvent, ctx: PluginHookAgentContext) {
+    return runVoidHook("llm_input", event, ctx);
+  }
+
+  /**
+   * Run llm_output hook.
+   * Allows plugins to observe the exact output payload returned by the LLM.
+   * Runs in parallel (fire-and-forget).
+   */
+  async function runLlmOutput(event: PluginHookLlmOutputEvent, ctx: PluginHookAgentContext) {
+    return runVoidHook("llm_output", event, ctx);
+  }
+
   /**
    * Run before_compaction hook.
    */
@@ -458,6 +480,8 @@ export function createHookRunner(registry: PluginRegistry, options: HookRunnerOp
   return {
     // Agent hooks
     runBeforeAgentStart,
+    runLlmInput,
+    runLlmOutput,
     runAgentEnd,
     runBeforeCompaction,
     runAfterCompaction,