Update file-picker-max to use haiku for file listing as well

Author: jahooma

.agents/file-explorer/file-lister.ts

@@ -0,0 +1,34 @@
+import { publisher } from '../constants'
+import {
+  PLACEHOLDER,
+  type SecretAgentDefinition,
+} from '../types/secret-agent-definition'
+
+const definition: SecretAgentDefinition = {
+  id: 'file-lister',
+  displayName: 'Liszt the File Lister',
+  publisher,
+  model: 'anthropic/claude-haiku-4.5',
+  spawnerPrompt: 'Lists files that are relevant to the prompt',
+  inputSchema: {
+    prompt: {
+      type: 'string',
+      description: 'A coding task to complete',
+    },
+  },
+  outputMode: 'last_message',
+  includeMessageHistory: false,
+  toolNames: [],
+  spawnableAgents: [],
+
+  systemPrompt: `You are an expert at finding relevant files in a codebase and listing them out. ${PLACEHOLDER.FILE_TREE_PROMPT}`,
+  instructionsPrompt: `Instructions:
+- Do not use any tools.
+- Do not write any analysis.
+- List out the full paths of up to 12 files that are relevant to the prompt, separated by newlines.
+
+Do not write an introduction. Do not use any tools. Do not write anything else other than the file paths.
+  `.trim(),
+}
+
+export default definition

.agents/file-explorer/file-picker-max.ts

@@ -21,21 +21,43 @@ const definition: SecretAgentDefinition = {
   },
   outputMode: 'last_message',
   includeMessageHistory: false,
-  toolNames: [],
-  spawnableAgents: [],
+  toolNames: ['spawn_agents'],
+  spawnableAgents: ['file-lister'],
 
   systemPrompt: `You are an expert at finding relevant files in a codebase. ${PLACEHOLDER.FILE_TREE_PROMPT_SMALL}`,
   instructionsPrompt: `Instructions:
 - Don't use any tools.
-- Provide a short report of the locations in the codebase that could be helpful. Focus on the files that are most relevant to the user prompt.
+- Provide a short report of the locations in the codebase that could be helpful. Focus on the files that are most relevant to the user prompt. Leave out irrelevant locations.
 In your report, please give a very concise analysis that includes the full paths of files that are relevant and (briefly) how they could be useful.
   `.trim(),
 
-  handleSteps: function* ({ agentState, prompt, params }) {
-    yield {
-      toolName: 'find_files',
-      input: { prompt: prompt ?? '' },
+  handleSteps: function* ({ prompt, logger }) {
+    const { toolResult: fileListerResults } = yield {
+      toolName: 'spawn_agents',
+      input: {
+        agents: [
+          {
+            agent_type: 'file-lister',
+            prompt: prompt ?? '',
+          },
+        ],
+      },
     } satisfies ToolCall
+
+    const fileListerResult = fileListerResults?.[0]
+    const filesStr =
+      fileListerResult && fileListerResult.type === 'json'
+        ? ((fileListerResult.value as any)?.[0]?.value?.value as string)
+        : ''
+    const files = filesStr.split('\n').filter(Boolean)
+
+    yield {
+      toolName: 'read_files',
+      input: {
+        paths: files,
+      },
+    }
+
     yield 'STEP_ALL'
   },
 }