Add file-picker-max which uses Haiku 4.5

Author: jahooma

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

@@ -0,0 +1,43 @@
+import { ToolCall } from 'types/agent-definition'
+import { publisher } from '../constants'
+
+import {
+  PLACEHOLDER,
+  type SecretAgentDefinition,
+} from '../types/secret-agent-definition'
+
+const definition: SecretAgentDefinition = {
+  id: 'file-picker',
+  displayName: 'Fletcher the File Fetcher',
+  publisher,
+  model: 'anthropic/claude-haiku-4.5',
+  spawnerPrompt:
+    'Spawn to find relevant files in a codebase related to the prompt. Cannot do string searches on the codebase.',
+  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. ${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.
+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 ?? '' },
+    } satisfies ToolCall
+    yield 'STEP_ALL'
+  },
+}
+
+export default definition