feat: 添加技能匹配摘要功能，优化技能提示信息，明确技能与工具的区别

Co-authored-by: Copilot <copilot@github.com>

src/agent/agent_loop.rs

@@ -529,6 +529,10 @@ pub trait EmittedMessageHandler: Send + Sync + 'static {
 
 pub trait SkillProvider: Send + Sync + 'static {
     fn system_index_prompt(&self) -> Option<String>;
+
+    fn matching_skill_summary(&self, _name: &str) -> Option<String> {
+        None
+    }
 }
 
 #[derive(Default)]
@@ -1024,9 +1028,17 @@ impl AgentLoop {
             Some(t) => t,
             None => {
                 tracing::warn!(tool = %tool_call.name, "Tool not found");
+                let skill_hint = self.skills.matching_skill_summary(&tool_call.name);
+                let error = match skill_hint {
+                    Some(summary) => format!(
+                        "Tool '{}' not found. A skill with the same name exists: {}. Skills are not tools. Call skill_activate with {{\"name\": \"{}\"}} first.",
+                        tool_call.name, summary, tool_call.name
+                    ),
+                    None => format!("Tool '{}' not found", tool_call.name),
+                };
                 return ToolExecutionOutcome::failure(
-                    format!("Error: Tool '{}' not found", tool_call.name),
+                    format!("Error: {}", error),
-                    Some(format!("Tool '{}' not found", tool_call.name)),
+                    Some(error),
                 );
             }
         };
@@ -1073,6 +1085,7 @@ impl AgentLoop {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::config::LLMProviderConfig;
     use crate::observability::{MultiObserver, Observer};
     use tempfile::tempdir;
 
@@ -1098,6 +1111,63 @@ mod tests {
         }
     }
 
+    struct TestSkillProvider;
+
+    impl SkillProvider for TestSkillProvider {
+        fn system_index_prompt(&self) -> Option<String> {
+            None
+        }
+
+        fn matching_skill_summary(&self, name: &str) -> Option<String> {
+            (name == "baidu-search").then(|| "用于百度搜索和天气查询的技能".to_string())
+        }
+    }
+
+    fn test_runtime_config() -> LLMProviderConfig {
+        LLMProviderConfig {
+            provider_type: "openai".to_string(),
+            name: "test".to_string(),
+            base_url: "http://localhost".to_string(),
+            api_key: "test-key".to_string(),
+            extra_headers: std::collections::HashMap::new(),
+            llm_timeout_secs: 120,
+            model_id: "test-model".to_string(),
+            temperature: Some(0.0),
+            max_tokens: Some(32),
+            context_window_tokens: None,
+            model_extra: std::collections::HashMap::new(),
+            max_tool_iterations: 1,
+            tool_result_max_chars: 20_000,
+            context_tool_result_trim_chars: 20_000,
+        }
+    }
+
+    #[tokio::test]
+    async fn test_missing_tool_with_same_name_skill_returns_activation_hint() {
+        let loop_instance = AgentLoop::with_tools_and_skill_provider(
+            test_runtime_config(),
+            Arc::new(ToolRegistry::new()),
+            Arc::new(TestSkillProvider),
+        )
+        .unwrap();
+
+        let outcome = loop_instance
+            .execute_tool_internal(&ToolCall {
+                id: "call-1".to_string(),
+                name: "baidu-search".to_string(),
+                arguments: serde_json::json!({
+                    "queries": "佛山今天几点下雨"
+                }),
+            })
+            .await;
+
+        assert_eq!(outcome.state, ToolExecutionState::Completed);
+        assert!(!outcome.success);
+        assert!(outcome.output.contains("技能"));
+        assert!(outcome.output.contains("skill_activate"));
+        assert!(outcome.output.contains("baidu-search"));
+    }
+
     #[tokio::test]
     async fn test_observer_receives_tool_events() {
         // Verify MultiObserver works

src/gateway/default_agent_prompt.md

@@ -47,3 +47,4 @@
 
 - 回答应以帮助用户完成当前目标为中心。
 - 在信息不足时先补关键前提，在信息充分时直接执行。
+- Skill 不是工具名。看到可用 Skill 时，不能直接调用 Skill 名称；必须先调用 skill_activate，并传入对应的 name。

src/gateway/memory_maintenance_system_prompt.md

@@ -1 +1,30 @@
-你是 PicoBot 的后台记忆整理器。你必须根据输入的候选记忆做语义整理，并严格返回 JSON，不要输出 Markdown 代码块，不要输出额外解释。输出 JSON 字段必须包含：user_facts, preferences, behavior_patterns, merges, conflicts, low_value_ids, managed_markdown。user_facts、preferences、behavior_patterns 是字符串数组。merges 是对象数组，每个对象必须包含 source_ids、namespace、memory_key、content。conflicts 是对象数组，每个对象必须包含 source_ids、note。low_value_ids 是需要删除的候选记忆 id 数组。只能引用输入里出现过的候选 id。managed_markdown 必须是 Markdown 文本，且只保留稳定模式，不写一次性事件。
+你是 PicoBot 的后台记忆整理器。
+
+你的任务是：
+
+- 根据输入的候选记忆做语义整理。
+- 严格返回 JSON。
+- 不要输出 Markdown 代码块。
+- 不要输出额外解释。
+
+输出 JSON 必须包含以下字段：
+
+- user_facts
+- preferences
+- behavior_patterns
+- merges
+- conflicts
+- low_value_ids
+- managed_markdown
+
+字段要求如下：
+
+- user_facts、preferences、behavior_patterns：字符串数组。
+- merges：对象数组。每个对象必须包含 source_ids、namespace、memory_key、content。
+- conflicts：对象数组。每个对象必须包含 source_ids、note。
+- low_value_ids：需要删除的候选记忆 id 数组。
+- managed_markdown：必须是 Markdown 文本，且只保留稳定模式，不写一次性事件。
+
+额外约束：
+
+- 只能引用输入里出现过的候选 id。

src/skills/mod.rs

@@ -226,6 +226,10 @@ impl crate::agent::SkillProvider for SkillRuntime {
     fn system_index_prompt(&self) -> Option<String> {
         SkillRuntime::system_index_prompt(self)
     }
+
+    fn matching_skill_summary(&self, name: &str) -> Option<String> {
+        self.get_skill(name).map(|skill| skill.description)
+    }
 }
 
 impl SkillSource {
@@ -319,7 +323,7 @@ impl SkillCatalog {
         }
 
         let mut prompt = String::from(
-            "You have access to skills discovered from local skill directories. Use a skill only when the user's request clearly matches the skill description.\nIf a skill is needed, call tool skill_activate with {\"name\": \"<skill-name>\"}.\nAvailable skills:\n",
+            "You have access to skills discovered from local skill directories. Use a skill only when the user's request clearly matches the skill description.\nSkills are not tools. Never call a skill name directly as a tool, even if the skill name looks tool-like.\nIf a skill is needed, you must call tool skill_activate with {\"name\": \"<skill-name>\"} before using the skill instructions.\nDo not call <skill-name> directly. Always call skill_activate first.\nAvailable skills:\n",
         );
 
         for skill in self.skills.iter().take(self.max_listed_skills) {