feat: add memory management tools and utility commands

src/tool/utility/cd.rs

@@ -0,0 +1,47 @@
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+
+pub struct Cd;
+
+impl Tool for Cd {
+    fn name(&self) -> &'static str {
+        "cd"
+    }
+
+    fn description(&self) -> &'static str {
+        "Check if a directory exists within the workspace and print its resolved path. Use this to verify a directory path before running other commands there."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "path": {
+                    "type": "string",
+                    "description": "Directory path (relative to workspace root)"
+                }
+            },
+            "required": ["path"]
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let rel = args.get("path")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: path"))?;
+
+        let path = super::super::resolve_path(&ctx.workspaces, rel)?;
+
+        if !path.exists() {
+            return Ok(format!("path '{}' does not exist (resolved to {})", rel, path.display()));
+        }
+        if !path.is_dir() {
+            return Ok(format!("path '{}' is not a directory (resolved to {})", rel, path.display()));
+        }
+
+        let canon = path.canonicalize().unwrap_or(path);
+        Ok(format!("{}", canon.display()))
+    }
+}

src/tool/utility/dir_cache_update.rs

@@ -0,0 +1,64 @@
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+
+pub struct DirCacheUpdate;
+
+impl Tool for DirCacheUpdate {
+    fn name(&self) -> &'static str {
+        "dir_cache_update"
+    }
+
+    fn description(&self) -> &'static str {
+        "Update the cached directory listing for a path. The directory cache is used by other tools for faster path resolution."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "path": {
+                    "type": "string",
+                    "description": "Directory path to cache (relative to workspace root)"
+                }
+            },
+            "required": ["path"]
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let rel = args.get("path")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: path"))?;
+
+        let path = super::super::resolve_path(&ctx.workspaces, rel)?;
+
+        if !path.exists() {
+            return Ok(format!("path '{}' does not exist (resolved to {})", rel, path.display()));
+        }
+
+        let entries = walk_directory(&path);
+        let count = entries.len();
+        let dc = ctx.dir_cache.clone();
+
+        let rt = tokio::runtime::Handle::try_current()
+            .map_err(|e| anyhow!("no tokio runtime available: {}", e))?;
+        rt.block_on(async move {
+            let cache = dc.write().await;
+            cache.set(entries).await;
+        });
+
+        Ok(format!("cached {} entries for {}", count, rel))
+    }
+}
+
+fn walk_directory(path: &std::path::Path) -> Vec<std::path::PathBuf> {
+    let mut result = Vec::new();
+    if let Ok(entries) = std::fs::read_dir(path) {
+        for entry in entries.flatten() {
+            result.push(entry.path());
+        }
+    }
+    result
+}

src/tool/utility/dir_list.rs

@@ -0,0 +1,67 @@
+use std::fs;
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+
+pub struct DirList;
+
+impl Tool for DirList {
+    fn name(&self) -> &'static str {
+        "dir_list"
+    }
+
+    fn description(&self) -> &'static str {
+        "List files and directories in a directory. Use this to explore the workspace structure."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "path": {
+                    "type": "string",
+                    "description": "Directory path to list (relative to workspace root)"
+                }
+            },
+            "required": ["path"]
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let rel = args.get("path")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: path"))?;
+
+        let path = super::super::resolve_path(&ctx.workspaces, rel)?;
+
+        if !path.exists() {
+            return Ok(format!("path '{}' does not exist (resolved to {})", rel, path.display()));
+        }
+        if !path.is_dir() {
+            return Ok(format!("path '{}' is not a directory (resolved to {})", rel, path.display()));
+        }
+
+        let entries: Vec<String> = fs::read_dir(&path)
+            .map_err(|e| anyhow!("failed to read directory '{}': {}", rel, e))?
+            .filter_map(|e| e.ok())
+            .map(|e| {
+                let name = e.file_name().to_string_lossy().to_string();
+                let is_dir = e.file_type().map(|t| t.is_dir()).unwrap_or(false);
+                if is_dir {
+                    format!("{}/", name)
+                } else {
+                    name
+                }
+            })
+            .collect();
+
+        let canon = path.canonicalize().unwrap_or(path);
+        let header = format!("{} entries in {}:\n", entries.len(), canon.display());
+        if entries.is_empty() {
+            Ok(format!("{} (empty directory)", header.trim()))
+        } else {
+            Ok(header + &entries.join("\n"))
+        }
+    }
+}

src/tool/utility/mod.rs

@@ -0,0 +1,5 @@
+pub mod cd;
+pub mod dir_cache_update;
+pub mod dir_list;
+pub mod pong;
+pub mod todowrite;

src/tool/utility/pong.rs

@@ -0,0 +1,35 @@
+use serde_json::{json, Value};
+use anyhow::Result;
+use super::super::Tool;
+use super::super::ToolCtx;
+
+pub struct Pong;
+
+impl Tool for Pong {
+    fn name(&self) -> &'static str {
+        "pong"
+    }
+
+    fn description(&self) -> &'static str {
+        "Simple connectivity check. Echoes back any input for health checks and latency testing."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "message": {
+                    "type": "string",
+                    "description": "Message to echo back"
+                }
+            }
+        })
+    }
+
+    fn run(&self, _ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let msg = args.get("message")
+            .and_then(|v| v.as_str())
+            .unwrap_or("pong");
+        Ok(format!("pong: {}", msg))
+    }
+}

src/tool/utility/todowrite.rs

@@ -0,0 +1,54 @@
+use std::fs;
+use std::path::PathBuf;
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+
+pub struct Todowrite;
+
+impl Tool for Todowrite {
+    fn name(&self) -> &'static str {
+        "todowrite"
+    }
+
+    fn description(&self) -> &'static str {
+        "Append a task to the session todo list. The todo persists in the session directory and is visible in the Todo panel."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "task": {
+                    "type": "string",
+                    "description": "Task description to add"
+                }
+            },
+            "required": ["task"]
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let task = args.get("task")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: task"))?;
+
+        let path: PathBuf = ctx.session_dir.join("todo.md");
+        let now = chrono::Utc::now();
+        let timestamp = now.format("%Y-%m-%d %H:%M:%S");
+        let line = format!("- [ ] {} ({})\n", task, timestamp);
+
+        fs::OpenOptions::new()
+            .create(true)
+            .append(true)
+            .open(&path)
+            .map_err(|e| anyhow!("failed to open todo.md: {}", e))?
+            .write_all(line.as_bytes())
+            .map_err(|e| anyhow!("failed to write to todo.md: {}", e))?;
+
+        Ok(format!("added task to todo.md: {}", task))
+    }
+}
+
+use std::io::Write;