fix: use full inputSchema for tool definitions instead of flattened parameters

The issue was that tools with complex nested parameters (like arrays of objects)
were losing their structure when converted to Zod schemas. The LLM would then
pass stringified JSON instead of actual arrays.

- Import jsonSchema from AI SDK
- Check if tool.inputSchema exists (full JSON Schema from executor)
- Use jsonSchema() wrapper to preserve nested array/object structures
- Fall back to legacy tpmjsParamsToZodSchema only if inputSchema is missing

This fixes the changelog tool and similar tools with complex parameter types.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/web/src/lib/ai-agent/tool-executor-agent.ts

@@ -6,7 +6,7 @@
 import { openai } from '@ai-sdk/openai';
 import type { Package, Tool } from '@tpmjs/db';
 import type { ExecutorConfig } from '@tpmjs/types/executor';
-import { type ModelMessage, generateText } from 'ai';
+import { generateText, jsonSchema, type ModelMessage } from 'ai';
 import { z } from 'zod';
 
 import { executeWithExecutor } from '../executors';
@@ -101,21 +101,24 @@ export function createToolDefinition(
   tool: Tool & { package: Package },
   executorConfig?: ExecutorConfig | null
 ) {
-  const parameters = Array.isArray(tool.parameters)
-    ? (tool.parameters as unknown as TPMJSParameter[])
-    : [];
-
   console.log('[createToolDefinition] Tool:', tool.package.npmPackageName, '/', tool.name);
-  console.log('[createToolDefinition] Parameters array:', JSON.stringify(parameters));
-  console.log('[createToolDefinition] Parameters length:', parameters.length);
 
-  // Ensure we have a valid schema - if no parameters, use an empty object
+  // Prefer full inputSchema if available (has nested object/array structures)
+  // Fall back to legacy parameters array conversion if not
   const inputSchema =
-    parameters.length > 0
-      ? tpmjsParamsToZodSchema(parameters)
-      : z.object({}).describe('No parameters required');
-
-  console.log('[createToolDefinition] Created Zod schema:', inputSchema);
+    tool.inputSchema && typeof tool.inputSchema === 'object'
+      ? // Use full JSON Schema directly - preserves nested array/object structures
+        jsonSchema(tool.inputSchema as Parameters<typeof jsonSchema>[0])
+      : // Legacy: convert flattened parameters array to Zod schema
+        (() => {
+          const parameters = Array.isArray(tool.parameters)
+            ? (tool.parameters as unknown as TPMJSParameter[])
+            : [];
+          console.log('[createToolDefinition] Using legacy parameters:', parameters.length);
+          return parameters.length > 0
+            ? tpmjsParamsToZodSchema(parameters)
+            : z.object({}).describe('No parameters required');
+        })();
 
   const sanitizedName = sanitizeToolName(`${tool.package.npmPackageName}-${tool.name}`);