diff --git a/src/tool/fs/delete.rs b/src/tool/fs/delete.rs
new file mode 100644
index 0000000..bd2c5b2
--- /dev/null
+++ b/src/tool/fs/delete.rs
@@ -0,0 +1,63 @@
+use std::fs;
+use std::path::PathBuf;
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+use super::super::resolve_path;
+use super::helpers::arg_str;
+
+pub struct Delete;
+
+impl Tool for Delete {
+    fn name(&self) -> &'static str {
+        "delete"
+    }
+
+    fn description(&self) -> &'static str {
+        "Delete a file or empty directory. Will not delete non-empty directories."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "path": {
+                    "type": "string",
+                    "description": "Path to the file or directory to delete (relative to workspace root)"
+                }
+            },
+            "required": ["path"]
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let rel = arg_str(args, "path")?;
+        let path: PathBuf = resolve_path(&ctx.workspaces, &rel)?;
+
+        if !path.exists() {
+            return Ok(format!("path '{}' does not exist (resolved to {})", rel, path.display()));
+        }
+
+        let metadata = path.metadata()
+            .map_err(|e| anyhow!("failed to read metadata for '{}': {}", rel, e))?;
+
+        if metadata.is_dir() {
+            let is_empty = fs::read_dir(&path)
+                .map_err(|e| anyhow!("failed to read directory '{}': {}", rel, e))?
+                .next()
+                .is_none();
+            if is_empty {
+                fs::remove_dir(&path)
+                    .map_err(|e| anyhow!("failed to remove directory '{}': {}", rel, e))?;
+                Ok(format!("removed empty directory {}", rel))
+            } else {
+                anyhow::bail!("directory '{}' is not empty (refusing to delete)", rel);
+            }
+        } else {
+            fs::remove_file(&path)
+                .map_err(|e| anyhow!("failed to delete '{}': {}", rel, e))?;
+            Ok(format!("deleted {}", rel))
+        }
+    }
+}
diff --git a/src/tool/fs/mod.rs b/src/tool/fs/mod.rs
index b838267..4633e67 100644
--- a/src/tool/fs/mod.rs
+++ b/src/tool/fs/mod.rs
@@ -1,3 +1,4 @@
+pub mod delete;
 pub mod edit;
 pub mod helpers;
 pub mod read;
diff --git a/src/tool/memory/forget.rs b/src/tool/memory/forget.rs
new file mode 100644
index 0000000..3386c1b
--- /dev/null
+++ b/src/tool/memory/forget.rs
@@ -0,0 +1,41 @@
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+use crate::model::memory::Memory;
+
+pub struct Forget;
+
+impl Tool for Forget {
+    fn name(&self) -> &'static str {
+        "forget"
+    }
+
+    fn description(&self) -> &'static str {
+        "Remove a specific memory entry by its name. Use recall first to find the exact name if unsure."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "name": {
+                    "type": "string",
+                    "description": "Name of the memory to remove (use recall to find exact names)"
+                }
+            },
+            "required": ["name"]
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let name = args.get("name")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: name"))?;
+
+        Memory::remove(&ctx.memory_dir, name)
+            .map_err(|e| anyhow!("failed to remove memory '{}': {}", name, e))?;
+
+        Ok(format!("removed memory '{}'", name))
+    }
+}
diff --git a/src/tool/memory/mod.rs b/src/tool/memory/mod.rs
new file mode 100644
index 0000000..f649cc6
--- /dev/null
+++ b/src/tool/memory/mod.rs
@@ -0,0 +1,3 @@
+pub mod forget;
+pub mod recall;
+pub mod remember;
diff --git a/src/tool/memory/recall.rs b/src/tool/memory/recall.rs
new file mode 100644
index 0000000..488a099
--- /dev/null
+++ b/src/tool/memory/recall.rs
@@ -0,0 +1,65 @@
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+use crate::model::memory::Memory;
+
+pub struct Recall;
+
+impl Tool for Recall {
+    fn name(&self) -> &'static str {
+        "recall"
+    }
+
+    fn description(&self) -> &'static str {
+        "Read memory entries. Pass a name to read a specific entry, or omit name to list all entries in the memory index. The memory index is also automatically injected into your system prompt."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "name": {
+                    "type": "string",
+                    "description": "Optional: exact name of a specific memory entry to read. If omitted, lists all entries."
+                }
+            }
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        if let Some(name) = args.get("name").and_then(|v| v.as_str()) {
+            if name.is_empty() {
+                return list_all(ctx);
+            }
+            let memory = Memory::read(&ctx.memory_dir, name)
+                .map_err(|e| anyhow!("memory '{}' not found: {}", name, e))?;
+            Ok(format!(
+                "---\nname: {}\ndescription: {}\nkind: {}\nlifecycle: {}\n---\n\n{}",
+                memory.name,
+                memory.description,
+                memory.kind,
+                memory.lifecycle,
+                memory.content,
+            ))
+        } else {
+            list_all(ctx)
+        }
+    }
+}
+
+fn list_all(ctx: &ToolCtx) -> Result<String> {
+    let names = Memory::list(&ctx.memory_dir);
+    if names.is_empty() {
+        return Ok("(no memory entries)".to_string());
+    }
+    let mut lines = format!("Memory index ({} entries):\n", names.len());
+    for name in &names {
+        if let Ok(mem) = Memory::read(&ctx.memory_dir, name) {
+            lines.push_str(&format!("- {} [{}]: {}\n", name, mem.kind, mem.description));
+        } else {
+            lines.push_str(&format!("- {}\n", name));
+        }
+    }
+    Ok(lines)
+}
diff --git a/src/tool/memory/remember.rs b/src/tool/memory/remember.rs
new file mode 100644
index 0000000..c4e67af
--- /dev/null
+++ b/src/tool/memory/remember.rs
@@ -0,0 +1,79 @@
+use serde_json::{json, Value};
+use anyhow::{Result, anyhow};
+use super::super::Tool;
+use super::super::ToolCtx;
+use crate::model::memory::Memory;
+
+pub struct Remember;
+
+impl Tool for Remember {
+    fn name(&self) -> &'static str {
+        "remember"
+    }
+
+    fn description(&self) -> &'static str {
+        "Save a piece of information to persistent project memory. Memory entries are injected into future conversations via the system prompt, so use this to record conventions, preferences, and important context."
+    }
+
+    fn parameters(&self) -> Value {
+        json!({
+            "type": "object",
+            "properties": {
+                "name": {
+                    "type": "string",
+                    "description": "Short unique name for the memory (kebab-case, e.g. 'testing-conventions')"
+                },
+                "description": {
+                    "type": "string",
+                    "description": "One-line summary shown in the memory index"
+                },
+                "content": {
+                    "type": "string",
+                    "description": "The memory content body"
+                },
+                "kind": {
+                    "type": "string",
+                    "description": "Type of memory: 'project', 'reference', 'lesson', or 'feedback'",
+                    "enum": ["project", "reference", "lesson", "feedback"]
+                }
+            },
+            "required": ["name", "description", "content", "kind"]
+        })
+    }
+
+    fn run(&self, ctx: &ToolCtx, args: &Value) -> Result<String> {
+        let name = args.get("name")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: name"))?;
+        let description = args.get("description")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: description"))?;
+        let content = args.get("content")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: content"))?;
+        let kind = args.get("kind")
+            .and_then(|v| v.as_str())
+            .ok_or_else(|| anyhow!("missing required argument: kind"))?;
+
+        if Memory::slugify(name).is_none() {
+            anyhow::bail!("invalid memory name: must produce a valid slug (alphanumeric + hyphens, 1-80 chars)");
+        }
+
+        let now = chrono::Utc::now().timestamp_millis();
+        let memory = Memory {
+            name: name.to_string(),
+            description: description.to_string(),
+            content: content.to_string(),
+            kind: kind.to_string(),
+            created_at: now,
+            updated_at: now,
+            outcome: None,
+            lifecycle: "new".to_string(),
+        };
+
+        memory.write(&ctx.memory_dir)
+            .map_err(|e| anyhow!("failed to write memory '{}': {}", name, e))?;
+
+        Ok(format!("saved memory '{}' ({})", name, kind))
+    }
+}
diff --git a/src/tool/mod.rs b/src/tool/mod.rs
index 488881a..f40689b 100644
--- a/src/tool/mod.rs
+++ b/src/tool/mod.rs
@@ -8,11 +8,13 @@ pub mod git_cred;
 pub mod git_operator;
 pub mod git_worktree;
 pub mod internet;
+pub mod memory;
 pub mod plan;
 pub mod search;
 pub mod seqthink;
 pub mod shell;
 pub mod shell_filter;
+pub mod utility;
 pub mod workflow;
 
 pub trait Tool: Send + Sync {
@@ -116,6 +118,7 @@ pub fn all_tools() -> Vec<Box<dyn Tool>> {
         Box::new(super::tool::fs::read::Read),
         Box::new(super::tool::fs::write::Write),
         Box::new(super::tool::fs::edit::Edit),
+        Box::new(super::tool::fs::delete::Delete),
         Box::new(super::tool::search::Grep),
         Box::new(super::tool::search::Glob),
         Box::new(super::tool::bash_tools::BashOutput),
@@ -131,6 +134,14 @@ pub fn all_tools() -> Vec<Box<dyn Tool>> {
         Box::new(super::tool::internet::fetch::Fetch),
         Box::new(super::tool::internet::download::Download),
         Box::new(super::tool::internet::search::Search),
+        Box::new(super::tool::memory::remember::Remember),
+        Box::new(super::tool::memory::forget::Forget),
+        Box::new(super::tool::memory::recall::Recall),
+        Box::new(super::tool::utility::cd::Cd),
+        Box::new(super::tool::utility::dir_list::DirList),
+        Box::new(super::tool::utility::dir_cache_update::DirCacheUpdate),
+        Box::new(super::tool::utility::pong::Pong),
+        Box::new(super::tool::utility::todowrite::Todowrite),
     ]
 }
 
diff --git a/src/tool/utility/cd.rs b/src/tool/utility/cd.rs
new file mode 100644
index 0000000..271b567
--- /dev/null
+++ b/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()))
+    }
+}
diff --git a/src/tool/utility/dir_cache_update.rs b/src/tool/utility/dir_cache_update.rs
new file mode 100644
index 0000000..104108e
--- /dev/null
+++ b/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
+}
diff --git a/src/tool/utility/dir_list.rs b/src/tool/utility/dir_list.rs
new file mode 100644
index 0000000..1cdfb0b
--- /dev/null
+++ b/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"))
+        }
+    }
+}
diff --git a/src/tool/utility/mod.rs b/src/tool/utility/mod.rs
new file mode 100644
index 0000000..adc8ac7
--- /dev/null
+++ b/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;
diff --git a/src/tool/utility/pong.rs b/src/tool/utility/pong.rs
new file mode 100644
index 0000000..bd7cbf3
--- /dev/null
+++ b/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))
+    }
+}
diff --git a/src/tool/utility/todowrite.rs b/src/tool/utility/todowrite.rs
new file mode 100644
index 0000000..e5c113c
--- /dev/null
+++ b/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;