feat(blueprints): emit per-field wire-format spec to guide MCP agents

src/Mcp/Exceptions/FieldFormatException.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Cboxdk\StatamicMcp\Mcp\Exceptions;
+
+use InvalidArgumentException;
+
+/**
+ * Thrown when MCP-supplied field data does not match the expected wire format.
+ *
+ * Messages from this class are considered safe for direct exposure to clients
+ * because the content is curated by this addon (field paths, expected shape).
+ * The base BaseStatamicTool error handler allow-lists this class so messages
+ * survive the production sanitization step.
+ */
+class FieldFormatException extends InvalidArgumentException {}