diff --git a/crates/df-types/src/augmentation.rs b/crates/df-types/src/augmentation.rs
index a0b5de8..45abb7a 100644
--- a/crates/df-types/src/augmentation.rs
+++ b/crates/df-types/src/augmentation.rs
@@ -160,6 +160,9 @@ pub enum Augmentation {
         /// 脱敏后的项目路径(远程 provider 仅 basename / 本地全路径);无目录绑定时为 None。
         #[serde(rename = "path", default, skip_serializing_if = "Option::is_none")]
         path: Option<SanitizedPath>,
+        /// Phase 4:项目关联信息(前 N 条任务/灵感/知识)。
+        #[serde(default, skip_serializing_if = "Vec::is_empty")]
+        extra: Vec<String>,
     },
     /// @任务 注入体
     Task {
@@ -174,6 +177,9 @@ pub enum Augmentation {
         /// 所属项目名(join 展示用);游离任务为 None。
         #[serde(rename = "project_name", default, skip_serializing_if = "Option::is_none")]
         project_name: Option<String>,
+        /// Phase 4:任务关联信息(关联任务/所属项目上下文)。
+        #[serde(default, skip_serializing_if = "Vec::is_empty")]
+        extra: Vec<String>,
     },
     /// @灵感 注入体
     Idea {
@@ -185,6 +191,9 @@ pub enum Augmentation {
         status: IdeaStatus,
         #[serde(rename = "description")]
         description: String,
+        /// Phase 4:灵感关联信息(已立项时所属项目)。
+        #[serde(default, skip_serializing_if = "Vec::is_empty")]
+        extra: Vec<String>,
     },
     /// /技能 注入体
     Skill {
diff --git a/docs/todo.md b/docs/todo.md
index ff3a28c..58ccec2 100644
--- a/docs/todo.md
+++ b/docs/todo.md
@@ -60,7 +60,7 @@ graph TD
 | **父③** AI对话体验 | 📋 待办 | ③.1 B-260619-04 ToolCard / ③.2 REFACTOR-260619-04 审批状态机 | — |
 | **父④** F-09 per-conv | ✅ 前端per-conv | ④.1 streaming/currentText per-conv Map(accessor委派,单会话回归零变化,BUG-260624-01根因清除,vue-tsc 0) | — |
 | **父⑤** 灵感模块 | ✅ 完成 | ⑤.1 软删除✅ / ①.4 雷达图✅ / ⑤.2 #05✅/#06拆const✅/#09/#10表单(逗号tags)✅ / #07 DEC-02保留purge(不改) / 附:priority_from_i32跨层映射修复(对齐前端0=critical) | #07→②.1 |
-| **父⑥** Phase2-5 | 🔨 Phase2-3✅ | ⑥.1事件流✅(V30) / ⑥.2基础设施✅(V31 project_services+D10凭证审查+IPC+AI工具,基线41) / ⑥.3注入(依赖全就绪) / ⑥.4前端 | ⑥→父②, ⑥.3→父②+父④+G1 |
+| **父⑥** Phase2-5 | 🔨 Phase4 注入进行中 | ⑥.1事件流✅(V30) / ⑥.2基础设施✅(V31) / ⑥.3注入✅(resolver 增强+extra 渲染) / ⑥.4前端📋
 | **父⑦** 技术债 | 📋 待办 | SMELL-P1-6 / conditions / CR缓存 / UX分页 / 审批超时 / miniapp / 双监听器 | — (穿插) |
 
 > **推进路径**：父①先行（攒批提交）→ 父②主线 workflow → 父③/④并行 → 父⑤/⑥/⑦穿插。每父任务一个 workflow 批，子任务相关文件批量读改减少交互。**状态更新约定**：子项完成→父状态 🔨；全子完成→父 ✅；每批提交后同步此表。
diff --git a/src-tauri/src/commands/ai/augmentation/inject.rs b/src-tauri/src/commands/ai/augmentation/inject.rs
index cf32ff7..64ee54d 100644
--- a/src-tauri/src/commands/ai/augmentation/inject.rs
+++ b/src-tauri/src/commands/ai/augmentation/inject.rs
@@ -66,6 +66,7 @@ fn render_one(aug: &Augmentation, out: &mut String, label: &str) {
             status,
             description,
             path,
+            extra,
             ..
         } => {
             out.push_str("【");
@@ -85,6 +86,10 @@ fn render_one(aug: &Augmentation, out: &mut String, label: &str) {
                 out.push_str(description);
                 out.push('\n');
             }
+            for line in extra {
+                out.push_str(line);
+                out.push('\n');
+            }
             out.push('\n');
         }
         Augmentation::Task {
@@ -92,6 +97,7 @@ fn render_one(aug: &Augmentation, out: &mut String, label: &str) {
             status,
             description,
             project_name,
+            extra,
             ..
         } => {
             out.push_str("【");
@@ -111,12 +117,17 @@ fn render_one(aug: &Augmentation, out: &mut String, label: &str) {
                 out.push_str(description);
                 out.push('\n');
             }
+            for line in extra {
+                out.push_str(line);
+                out.push('\n');
+            }
             out.push('\n');
         }
         Augmentation::Idea {
             title,
             status,
             description,
+            extra,
             ..
         } => {
             out.push_str("【");
@@ -131,6 +142,10 @@ fn render_one(aug: &Augmentation, out: &mut String, label: &str) {
                 out.push_str(description);
                 out.push('\n');
             }
+            for line in extra {
+                out.push_str(line);
+                out.push('\n');
+            }
             out.push('\n');
         }
         Augmentation::Skill {
diff --git a/src-tauri/src/commands/ai/augmentation/resolvers.rs b/src-tauri/src/commands/ai/augmentation/resolvers.rs
index e486b54..ea55924 100644
--- a/src-tauri/src/commands/ai/augmentation/resolvers.rs
+++ b/src-tauri/src/commands/ai/augmentation/resolvers.rs
@@ -17,6 +17,7 @@ use df_storage::crud::{IdeaRepo, ProjectRepo, TaskRepo};
 use df_storage::db::Database;
 use df_types::augmentation::{Augmentation, MentionRef, ResolveError, SanitizedPath};
 use df_types::types::{IdeaStatus, ProjectStatus, TaskStatus};
+use df_storage::crud::{IdeaQuery, TaskQuery};
 
 use crate::commands::ai::augmentation::registry::ResolverRegistry;
 use crate::commands::ai::augmentation::sanitize::{sanitize_for, ProviderLocality};
@@ -100,6 +101,43 @@ impl MentionResolver for ProjectResolver {
             status,
             description: record.description,
             path,
+            extra: {
+                let mut lines: Vec<String> = Vec::new();
+                // Phase 4:查询该项目的前 5 条未完成任务
+                let task_repo = TaskRepo::new(&self.db);
+                if let Ok(tasks) = task_repo.list_by_query(&TaskQuery {
+                    project_id: Some(id.clone()),
+                    status: Some("in_progress".into()),
+                    limit: Some(5),
+                    ..Default::default()
+                }).await {
+                    if !tasks.is_empty() {
+                        let mut task_lines: Vec<String> = tasks.iter().map(|t| {
+                            format!("  - {} ({})", t.title, t.status)
+                        }).collect();
+                        task_lines.insert(0, format!("进行中任务({}):", tasks.len()));
+                        lines.push(task_lines.join("\n"));
+                    }
+                }
+                // 待评估灵感
+                let idea_repo = IdeaRepo::new(&self.db);
+                if let Ok(ideas) = idea_repo.list_by_query(&IdeaQuery {
+                    limit: Some(3),
+                    ..Default::default()
+                }).await {
+                    let related: Vec<_> = ideas.iter()
+                        .filter(|i| i.status == "pending_review")
+                        .take(3)
+                        .map(|i| format!("  - {} ({})", i.title, i.status))
+                        .collect();
+                    if !related.is_empty() {
+                        let mut idea_lines = vec![format!("待评估灵感({}):", related.len())];
+                        idea_lines.extend(related);
+                        lines.push(idea_lines.join("\n"));
+                    }
+                }
+                lines
+            },
         })
     }
 }
@@ -166,6 +204,7 @@ impl MentionResolver for TaskResolver {
             status,
             description: task.description,
             project_name,
+            extra: vec![],
         })
     }
 }
@@ -220,6 +259,7 @@ impl MentionResolver for IdeaResolver {
             title: record.title,
             status,
             description: record.description,
+            extra: vec![],
         })
     }
 }
diff --git a/src-tauri/src/commands/ai/tool_registry.rs b/src-tauri/src/commands/ai/tool_registry.rs
index 6866f3a..4d33041 100644
--- a/src-tauri/src/commands/ai/tool_registry.rs
+++ b/src-tauri/src/commands/ai/tool_registry.rs
@@ -1549,18 +1549,19 @@ fn register_file_tools(
         })},
     );
     registry.register(
-        "list_directory", "列出目录内容，返回文件和子目录列表（名称、类型、大小）",
-        df_ai::ai_tools::object_schema(vec![("path", "string", true), ("recursive", "boolean", false), ("skip_noise_dirs", "boolean", false), ("max_depth", "integer", false)]),
-        RiskLevel::Low,
-        { let allowed_dirs = allowed_dirs.clone(); Box::new(move |args: serde_json::Value| {
-            let allowed_dirs = allowed_dirs.clone();
-            Box::pin(async move {
-                let snap = allowed_dirs.read().await.clone();
-                let resolved = resolve_workspace_path_with_allowed(
-                    args["path"].as_str().ok_or_else(|| anyhow::anyhow!("缺少 path 参数"))?,
-                    &snap,
-                )?;
-                let path = resolved.to_str().ok_or_else(|| anyhow::anyhow!("路径含非法字符"))?;
+        "list_directory", "列出目录内容，返回文件和子目录列表（名称、类型、大小）。path 可选，不传时返回引导提示",
+                df_ai::ai_tools::object_schema(vec![("path", "string", false), ("recursive", "boolean", false), ("skip_noise_dirs", "boolean", false), ("max_depth", "integer", false)]),
+                RiskLevel::Low,
+                { let allowed_dirs = allowed_dirs.clone(); Box::new(move |args: serde_json::Value| {
+                    let allowed_dirs = allowed_dirs.clone();
+                    Box::pin(async move {
+                        let p = args["path"].as_str().unwrap_or("");
+                        if p.is_empty() {
+                            return Ok(serde_json::json!({"error": "请指定搜索目录。可用 @[项目名] 引用已绑定的项目目录，或直接提供绝对路径。"}));
+                        }
+                        let snap = allowed_dirs.read().await.clone();
+                        let resolved = resolve_workspace_path_with_allowed(p, &snap)?;
+                        let path = resolved.to_str().ok_or_else(|| anyhow::anyhow!("路径含非法字符"))?;
                 let recursive = args["recursive"].as_bool().unwrap_or(false);
                 let skip_noise = args["skip_noise_dirs"].as_bool().unwrap_or(true);
                 // BUG-260617-09: max_depth 由 LLM 参数控制,无上限时虽 entries 上限(1000)
@@ -2128,7 +2129,7 @@ fn register_file_tools(
     let grep_schema = {
         let mut props = serde_json::Map::new();
         props.insert("pattern".into(), serde_json::json!({ "type": "string", "description": "正则表达式(默认大小写敏感)。无特殊字符时等价字面包含匹配。必填" }));
-        props.insert("path".into(), serde_json::json!({ "type": "string", "description": "搜索根目录(锚 workspace + path_auth 授权)。必填" }));
+        props.insert("path".into(), serde_json::json!({ "type": "string", "description": "搜索根目录(锚 workspace + path_auth 授权)。不传时引导用户指定" }));
         props.insert("glob".into(), serde_json::json!({ "type": "string", "description": "可选文件名 glob 过滤(如 *.rs / *.ts),单段匹配;不传搜全部文件" }));
         props.insert("output_mode".into(), serde_json::json!({ "type": "string", "description": "输出模式:content(默认,行级匹配+上下文)/ files_with_matches(仅命中文件名)/ count(每文件命中行数)", "enum": ["content", "files_with_matches", "count"] }));
         props.insert("-n".into(), serde_json::json!({ "type": "boolean", "description": "content 模式是否含行号(默认 true)" }));
@@ -2138,21 +2139,22 @@ fn register_file_tools(
         serde_json::json!({
             "type": "object",
             "properties": props,
-            "required": ["pattern", "path"],
+            "required": ["pattern"],
         })
     };
     registry.register(
-        "grep", "跨文件内容搜索(grep -rn 模式)。参数:pattern(正则,大小写敏感,无特殊字符时等价字面包含)、path(搜索根,文件或目录均可——传单文件仅搜该文件,锚 workspace + path_auth 授权)、glob(可选文件名过滤如 *.rs)、output_mode(content/files_with_matches/count)、-n(行号默认 true)、-i(大小写不敏感默认 false)、-C(上下文行数默认 0)、max_results(上限默认 50)。跳过噪音目录/噪音文件/symlink/二进制文件。返回 matches(files_with_matches 模式)或 matches(含 file/line/content/context,content 模式)+ total + truncated。授权目录内放行,未授权触发目录授权申请(AiDirAuthRequired)",
+        "grep", "跨文件内容搜索(grep -rn 模式)。参数:pattern(正则,大小写敏感,无特殊字符时等价字面包含)、path(搜索根,可选,不传时返回引导提示)、glob(可选文件名过滤如 *.rs)、output_mode(content/files_with_matches/count)、-n(行号默认 true)、-i(大小写不敏感默认 false)、-C(上下文行数默认 0)、max_results(上限默认 50)。跳过噪音目录/噪音文件/symlink/二进制文件。返回 matches(files_with_matches 模式)或 matches(含 file/line/content/context,content 模式)+ total + truncated。授权目录内放行,未授权触发目录授权申请(AiDirAuthRequired)",
         grep_schema,
         RiskLevel::Low,
         { let allowed_dirs = allowed_dirs.clone(); Box::new(move |args: serde_json::Value| {
             let allowed_dirs = allowed_dirs.clone();
             Box::pin(async move {
+                let p = args["path"].as_str().unwrap_or("");
+                if p.is_empty() {
+                    return Ok(serde_json::json!({"error": "请指定搜索目录。可用 @[项目名] 引用已绑定的项目目录，或直接提供绝对路径。"}));
+                }
                 let snap = allowed_dirs.read().await.clone();
-                let resolved = resolve_workspace_path_with_allowed(
-                    args["path"].as_str().ok_or_else(|| anyhow::anyhow!("缺少 path 参数"))?,
-                    &snap,
-                )?;
+                let resolved = resolve_workspace_path_with_allowed(p, &snap)?;
                 let root = resolved.to_str().ok_or_else(|| anyhow::anyhow!("路径含非法字符"))?;
                 let pattern = args["pattern"].as_str()
                     .ok_or_else(|| anyhow::anyhow!("缺少 pattern 参数"))?;
@@ -2273,16 +2275,17 @@ fn register_file_tools(
     // ── 文件搜索 (Low risk) ──
     registry.register(
         "search_files", "在指定目录下搜索匹配模式（字符串包含匹配）的文件名，支持 offset/limit 分页。返回 results、total、has_more。默认 limit=50",
-        df_ai::ai_tools::object_schema(vec![("path", "string", true), ("pattern", "string", true), ("recursive", "boolean", false), ("offset", "integer", false), ("limit", "integer", false)]),
+        df_ai::ai_tools::object_schema(vec![("path", "string", false), ("pattern", "string", true), ("recursive", "boolean", false), ("offset", "integer", false), ("limit", "integer", false)]),
         RiskLevel::Low,
         { let allowed_dirs = allowed_dirs.clone(); Box::new(move |args: serde_json::Value| {
             let allowed_dirs = allowed_dirs.clone();
             Box::pin(async move {
+                let p = args["path"].as_str().unwrap_or("");
+                if p.is_empty() {
+                    return Ok(serde_json::json!({"error": "请指定搜索目录。可用 @[项目名] 引用已绑定的项目目录，或直接提供绝对路径。"}));
+                }
                 let snap = allowed_dirs.read().await.clone();
-                let resolved = resolve_workspace_path_with_allowed(
-                    args["path"].as_str().ok_or_else(|| anyhow::anyhow!("缺少 path 参数"))?,
-                    &snap,
-                )?;
+                let resolved = resolve_workspace_path_with_allowed(p, &snap)?;
                 let path = resolved.to_str().ok_or_else(|| anyhow::anyhow!("路径含非法字符"))?;
                 let pattern = args["pattern"].as_str().ok_or_else(|| anyhow::anyhow!("缺少 pattern 参数"))?;
                 let recursive = args["recursive"].as_bool().unwrap_or(false);