Warn about broad tool response projections

crates/crank-core/src/tool_quality.rs

@@ -7,6 +7,7 @@ const MIN_DESCRIPTION_CHARS: usize = 40;
 const GENERIC_TOOL_NAMES: &[&str] = &["call_api", "manage", "execute", "request"];
 const MULTI_ACTION_FIELD_NAMES: &[&str] = &["action", "mode", "operation", "type"];
 const ENUM_LIKE_FIELD_NAMES: &[&str] = &["mode", "type", "status", "category"];
+const MANY_PROJECTED_FIELDS_THRESHOLD: usize = 12;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case")]
@@ -58,6 +59,17 @@ pub struct ToolQualitySchemaNode {
     pub enum_values: Vec<String>,
 }
 
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+pub struct ToolQualityMappingRule {
+    pub source: String,
+    pub target: String,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize, Default)]
+pub struct ToolQualityMappingSet {
+    pub rules: Vec<ToolQualityMappingRule>,
+}
+
 impl ToolQualityReport {
     pub fn new(findings: Vec<ToolQualityFinding>) -> Self {
         let blocking = findings
@@ -175,6 +187,37 @@ pub fn analyze_tool_schema_quality(
     ToolQualityReport::new(findings)
 }
 
+pub fn analyze_tool_response_projection_quality(
+    output_mapping: &ToolQualityMappingSet,
+) -> ToolQualityReport {
+    let mut findings = Vec::new();
+
+    for (index, rule) in output_mapping.rules.iter().enumerate() {
+        let source = rule.source.trim();
+        if source == "$.response.body" || source == "$.response.data" {
+            findings.push(finding(
+                ToolQualitySeverity::Warning,
+                "response_projection_full_body",
+                "Результат инструмента отдает агенту весь ответ API.",
+                Some("Выберите только поля, которые нужны агенту для ответа пользователю или следующего действия."),
+                Some(&format!("output_mapping.rules.{index}.source")),
+            ));
+        }
+    }
+
+    if output_mapping.rules.len() >= MANY_PROJECTED_FIELDS_THRESHOLD {
+        findings.push(finding(
+            ToolQualitySeverity::Info,
+            "response_projection_many_fields",
+            "В результат инструмента попадает много полей.",
+            Some("Проверьте, что каждое поле действительно нужно агенту. Лишние данные увеличивают риск ошибок и галлюцинаций."),
+            Some("output_mapping.rules"),
+        ));
+    }
+
+    ToolQualityReport::new(findings)
+}
+
 fn is_safe_tool_name(value: &str) -> bool {
     let mut chars = value.chars();
     let Some(first) = chars.next() else {