diff --git a/.cursor/rules/git-commands.md b/.cursor/rules/git-commands.md
new file mode 100644
index 0000000..9b6f380
--- /dev/null
+++ b/.cursor/rules/git-commands.md
@@ -0,0 +1,31 @@
+# Git Commands
+
+Always use `--no-abbrev-commit` and proper formatting flags for all git terminal commands to avoid shell parsing issues.
+
+## Specific Commands to Use:
+
+**Instead of:**
+```bash
+git log --oneline
+git show --stat HEAD
+git branch -v
+```
+
+**Use:**
+```bash
+git log --pretty=format:"%h %s" --no-abbrev-commit
+git show --stat --no-abbrev-commit HEAD
+git branch --show-current
+```
+
+## Key Flags:
+- `--no-abbrev-commit` - Prevents abbreviated commit hashes
+- `--pretty=format:"..."` - Use explicit formatting
+- `--porcelain` - For cleaner output when available
+- `--no-color` - Remove ANSI color codes
+- `--show-current` - For branch operations
+
+## Common Patterns:
+- `git log master..HEAD` → `git log --pretty=format:"%h %s" --no-abbrev-commit master..HEAD`
+- `git status` → `git status --porcelain`
+- `git diff --name-only master` → `git diff --name-only master`
diff --git a/Cargo.lock b/Cargo.lock
index b78fce9..c060217 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1457,6 +1457,13 @@ dependencies = [
  "wit-bindgen-rt 0.42.1",
 ]
 
+[[package]]
+name = "plugin-tee"
+version = "0.1.0"
+dependencies = [
+ "wit-bindgen-rt 0.42.1",
+]
+
 [[package]]
 name = "plugin-weather"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index 0b7e2e7..3785940 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,7 @@ members = [
     "crates/plugin-ls",
     "crates/plugin-cat",
     "crates/plugin-weather",
+    "crates/plugin-tee",
     "crates/repl-logic-guest",
 ]
 
diff --git a/README.md b/README.md
index e4c0334..b830172 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,7 @@ pluginlab\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_echo.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_weather.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_cat.wasm\
+  --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_tee.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin-echo-c.wasm\
   --allow-all
 ```
@@ -106,6 +107,7 @@ pluginlab\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_echo.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_weather.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_cat.wasm\
+  --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_tee.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin-echo-c.wasm\
   --allow-all
 [Host] Starting REPL host...
@@ -115,6 +117,8 @@ pluginlab\
 [Host] Loading plugin: https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_echo.wasm
 [Host] Loading plugin: https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_weather.wasm
 [Host] Loading plugin: https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_cat.wasm
+[Host] Loading plugin: https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_tee.wasm
+[Host] Loading plugin: https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin-echo-c.wasm
 repl(0)> echo foo
 foo
 repl(0)> echo $ROOT/$USER
@@ -220,6 +224,7 @@ This will (see [justfile](./justfile)):
   --plugins ./target/wasm32-wasip1/debug/plugin_echo.wasm\
   --plugins ./target/wasm32-wasip1/debug/plugin_weather.wasm\
   --plugins ./target/wasm32-wasip1/debug/plugin_cat.wasm\
+  --plugins ./target/wasm32-wasip1/debug/plugin_tee.wasm\
   --plugins ./c_modules/plugin-echo/plugin-echo-c.wasm\
   --allow-all
 ```
@@ -378,13 +383,14 @@ When a git tag is pushed, a pre-release is prepared on github, linked to the tag
 
 ```sh
 pluginlab\
-  --repl-logic https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/repl_logic_guest.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_greet.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_ls.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_echo.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_weather.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_cat.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin-echo-c.wasm\
+  --repl-logic https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/repl_logic_guest.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_greet.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_ls.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_echo.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_weather.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_cat.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_tee.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin-echo-c.wasm\
   --allow-all
 ```
 
diff --git a/crates/plugin-tee/.gitignore b/crates/plugin-tee/.gitignore
new file mode 100644
index 0000000..4c8e258
--- /dev/null
+++ b/crates/plugin-tee/.gitignore
@@ -0,0 +1 @@
+src/bindings.rs
diff --git a/crates/plugin-tee/Cargo.toml b/crates/plugin-tee/Cargo.toml
new file mode 100644
index 0000000..30abe51
--- /dev/null
+++ b/crates/plugin-tee/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "plugin-tee"
+version = "0.1.0"
+edition = { workspace = true }
+publish = false
+description = "Example tee plugin for REPL based on WebAssembly Component Model - demonstrates file system access and modification"
+
+[dependencies]
+wit-bindgen-rt = { workspace = true, features = ["bitflags"] }
+
+[lib]
+crate-type = ["cdylib"]
+
+[package.metadata.component]
+package = "repl:api"
+target = { path = "../pluginlab/wit", world = "plugin-api" }
+
+[package.metadata.component.dependencies]
diff --git a/crates/plugin-tee/README.md b/crates/plugin-tee/README.md
new file mode 100644
index 0000000..2a68ffa
--- /dev/null
+++ b/crates/plugin-tee/README.md
@@ -0,0 +1,14 @@
+# plugin-tee
+
+Basic plugin for this REPL. Behaves like the `tee` command.
+
+## Notes
+
+This crate was initialized with `cargo component new`.
+
+The building process is handled by the [`justfile`](../../justfile) in the root of the project.
+
+The `cargo component build` command is used to build the plugin.
+
+- It generates the `src/bindings.rs` file, based on the `package.metadata.component` section in the `Cargo.toml` file that describes where to find the component definition (wit files).
+- It then compiles the plugin to WebAssembly.
diff --git a/crates/plugin-tee/src/lib.rs b/crates/plugin-tee/src/lib.rs
new file mode 100644
index 0000000..b0230ac
--- /dev/null
+++ b/crates/plugin-tee/src/lib.rs
@@ -0,0 +1,99 @@
+#[allow(warnings)]
+mod bindings;
+
+use std::io::Write;
+
+use crate::bindings::exports::repl::api::plugin::Guest;
+use crate::bindings::repl::api::host_state_plugin;
+use crate::bindings::repl::api::transport;
+
+struct Component;
+
+impl Guest for Component {
+    fn name() -> String {
+        "tee".to_string()
+    }
+
+    fn man() -> String {
+        r#"
+NAME
+    tee - Copy $0 content to a file (built with Rust🦀)
+
+USAGE
+    tee <file>
+    tee -a <file>
+
+OPTIONS
+    -a, --append  Append to the file instead of overwriting it
+
+DESCRIPTION
+    Copy $0 content to a file.
+
+        "#
+        .to_string()
+    }
+
+    fn run(payload: String) -> Result<transport::PluginResponse, ()> {
+        match run_inner(payload) {
+            Ok(content) => Ok(transport::PluginResponse {
+                status: transport::ReplStatus::Success,
+                stdout: Some(format!("{}", content)),
+                stderr: None,
+            }),
+            Err(e) => {
+                // e.kind() - verify if the error is a permission error
+                return Ok(transport::PluginResponse {
+                    status: transport::ReplStatus::Error,
+                    stdout: None,
+                    stderr: Some(format!("{}", e)),
+                });
+            }
+        }
+    }
+}
+
+fn run_inner(payload: String) -> Result<String, String> {
+    let is_append = payload.starts_with("-a") || payload.starts_with("--append");
+    let filepath = if is_append {
+        let Some((_, filepath)) = payload.split_once(" ") else {
+            return Err("Invalid arguments. Usage: tee <file> or tee -a <file>".to_string());
+        };
+        filepath.to_string()
+    } else {
+        payload
+    };
+
+    let content = host_state_plugin::get_repl_var("0").unwrap_or("".to_string());
+    let content_as_bytes = content.as_bytes();
+
+    if !is_append {
+        let mut file = std::fs::File::create(&filepath)
+            .map_err(|e| enhanced_error(e, format!("Failed to create file '{}'", filepath)))?;
+        file.write_all(content_as_bytes)
+            .map_err(|e| enhanced_error(e, format!("Failed to write to file '{}'", filepath)))?;
+        return Ok(content);
+    } else {
+        let mut file = std::fs::File::options()
+            .append(true)
+            .open(&filepath)
+            .map_err(|e| {
+                enhanced_error(
+                    e,
+                    format!("Failed to open file in append mode '{}'", filepath),
+                )
+            })?;
+        // Add a newline before the content in append mode
+        file.write_all(b"\n").map_err(|e| {
+            enhanced_error(e, format!("Failed to write newline to file '{}'", filepath))
+        })?;
+        file.write_all(content_as_bytes)
+            .map_err(|e| enhanced_error(e, format!("Failed to write to file '{}'", filepath)))?;
+        return Ok(content);
+    }
+}
+
+fn enhanced_error(e: std::io::Error, more_info: String) -> String {
+    format!("{} - {} - {}", e.kind(), more_info, e.to_string())
+}
+
+bindings::export!(Component with_types_in bindings);
diff --git a/crates/pluginlab/README.md b/crates/pluginlab/README.md
index 2000ab9..f9d3a9f 100644
--- a/crates/pluginlab/README.md
+++ b/crates/pluginlab/README.md
@@ -61,6 +61,7 @@ pluginlab\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_echo.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_weather.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_cat.wasm\
+  --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_tee.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin-echo-c.wasm\
   --allow-all
 ```
@@ -85,6 +86,7 @@ pluginlab\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_echo.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_weather.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_cat.wasm\
+  --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin_tee.wasm\
   --plugins https://topheman.github.io/webassembly-component-model-experiments/plugins/plugin-echo-c.wasm\
   --allow-all
 [Host] Starting REPL host...
@@ -133,13 +135,14 @@ The plugins are also versioned in [github releases](https://github.com/topheman/
     <summary>Example of running the CLI host with old versions of the plugins (if you have an old version of <code>pluginlab</code></summary>
     <pre>
 pluginlab\
-  --repl-logic https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/repl_logic_guest.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_greet.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_ls.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_echo.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_weather.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_cat.wasm\
-  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin-echo-c.wasm\
+  --repl-logic https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/repl_logic_guest.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_greet.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_ls.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_echo.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_weather.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_cat.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_tee.wasm\
+  --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin-echo-c.wasm\
   --allow-all
     </pre>
 </summary>
@@ -163,7 +166,7 @@ pluginlab\
 [Host] You are most likely trying to use a plugin not compatible with pluginlab@0.4.1
 [Host]
 [Host] Try using a compatible version of the plugin by passing the following flag:
-[Host] --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.4.1/plugin_echo.wasm
+[Host] --plugins https://github.com/topheman/webassembly-component-model-experiments/releases/download/pluginlab@0.5.0/plugin_echo.wasm
 [Host]
 [Host] If it doesn't work, make sure to use the latest version of pluginlab: `cargo install pluginlab`
 [Host]
diff --git a/crates/pluginlab/src/engine.rs b/crates/pluginlab/src/engine.rs
index 10d2731..3a00671 100644
--- a/crates/pluginlab/src/engine.rs
+++ b/crates/pluginlab/src/engine.rs
@@ -1,7 +1,7 @@
 use crate::cli::Cli;
 use crate::permissions::NetworkPermissions;
 use anyhow::Result;
-use std::collections::HashMap;
+
 use std::path::Path;
 use wasmtime::component::{Component, Linker as ComponentLinker, ResourceTable};
 use wasmtime::{Config, Engine, Store};
@@ -120,6 +120,9 @@ impl WasmEngine {
 
     /// Create a new store with WASI context
     pub fn create_store(&self, wasi_ctx: WasiCtx, cli: &Cli) -> Store<WasiState> {
+        let repl_vars =
+            std::sync::Arc::new(std::sync::Mutex::new(std::collections::HashMap::new()));
+
         Store::new(
             &self.engine,
             WasiState {
@@ -127,8 +130,9 @@ impl WasmEngine {
                 table: ResourceTable::new(),
                 plugin_host: PluginHost {
                     network_permissions: NetworkPermissions::from(cli),
+                    repl_vars: repl_vars.clone(),
                 },
-                repl_vars: HashMap::new(),
+                repl_vars,
                 plugins_names: Vec::new(),
             },
         )
diff --git a/crates/pluginlab/src/helpers.rs b/crates/pluginlab/src/helpers.rs
index 5fb8ab0..452e626 100644
--- a/crates/pluginlab/src/helpers.rs
+++ b/crates/pluginlab/src/helpers.rs
@@ -1,22 +1,32 @@
 use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
 
 /// Handles setting exit status codes in REPL variables
 pub struct StatusHandler;
 
 impl StatusHandler {
     /// Set the exit status in the REPL variables
-    pub fn set_exit_status(repl_vars: &mut HashMap<String, String>, success: bool) {
+    pub fn set_exit_status(repl_vars: &mut Arc<Mutex<HashMap<String, String>>>, success: bool) {
         let status = if success { "0" } else { "1" };
-        repl_vars.insert("?".to_string(), status.to_string());
+        repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock")
+            .insert("?".to_string(), status.to_string());
     }
 }
 
 pub struct StdoutHandler;
 
 impl StdoutHandler {
-    pub fn print_and_set_last_result(repl_vars: &mut HashMap<String, String>, result: String) {
+    pub fn print_and_set_last_result(
+        repl_vars: &mut Arc<Mutex<HashMap<String, String>>>,
+        result: String,
+    ) {
         println!("{}", result);
-        repl_vars.insert("0".to_string(), result);
+        repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock")
+            .insert("0".to_string(), result);
     }
 }
 
diff --git a/crates/pluginlab/src/lib.rs b/crates/pluginlab/src/lib.rs
index 045867c..211f2c7 100644
--- a/crates/pluginlab/src/lib.rs
+++ b/crates/pluginlab/src/lib.rs
@@ -57,22 +57,33 @@ pub async fn run_async() -> Result<()> {
         eprintln!("[Host][Debug] Loaded plugins config: {:?}", plugins_config);
     }
 
-    host.store
-        .data_mut()
-        .repl_vars
-        .insert("ROOT".to_string(), "/Users".to_string());
-    host.store
-        .data_mut()
-        .repl_vars
-        .insert("USER".to_string(), "Tophe".to_string());
-    host.store
-        .data_mut()
-        .repl_vars
-        .insert("?".to_string(), "0".to_string());
+    {
+        let mut repl_vars = host
+            .store
+            .data_mut()
+            .repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock");
+        repl_vars.insert("ROOT".to_string(), "/Users".to_string());
+    }
+    {
+        let mut repl_vars = host
+            .store
+            .data_mut()
+            .repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock");
+        repl_vars.insert("USER".to_string(), "Tophe".to_string());
+        repl_vars.insert("?".to_string(), "0".to_string());
+    }
     if debug {
         eprintln!(
             "[Host][Debug] Loaded env vars: {:?}",
-            host.store.data().repl_vars
+            host.store
+                .data()
+                .repl_vars
+                .lock()
+                .expect("Failed to acquire repl_vars lock")
         );
     }
 
@@ -82,7 +93,14 @@ pub async fn run_async() -> Result<()> {
 
     loop {
         let mut line = String::new();
-        match host.store.data().repl_vars.get("?") {
+        match host
+            .store
+            .data()
+            .repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock")
+            .get("?")
+        {
             Some(last_status) => {
                 print!("repl({})> ", last_status);
             }
diff --git a/crates/pluginlab/src/store.rs b/crates/pluginlab/src/store.rs
index 366f9d4..5b5996e 100644
--- a/crates/pluginlab/src/store.rs
+++ b/crates/pluginlab/src/store.rs
@@ -1,5 +1,6 @@
 use crate::permissions::NetworkPermissions;
 use std::collections::HashMap;
+use std::sync::{Arc, Mutex};
 use wasmtime::component::ResourceTable;
 use wasmtime_wasi::p2::{IoView, WasiCtx, WasiView};
 
@@ -30,7 +31,7 @@ pub struct WasiState {
     /// and shared with the guest via the Guest bindings
 
     /// Custom environment variables stored by the REPL
-    pub repl_vars: HashMap<String, String>,
+    pub repl_vars: Arc<Mutex<HashMap<String, String>>>,
 
     /// Names of the plugins loaded in the host
     pub plugins_names: Vec<String>,
@@ -40,6 +41,8 @@ pub struct WasiState {
 pub struct PluginHost {
     /// Network permissions
     pub network_permissions: NetworkPermissions,
+    /// Shared reference to repl_vars from WasiState
+    pub repl_vars: Arc<Mutex<HashMap<String, String>>>,
 }
 
 impl crate::api::plugin_api::repl::api::http_client::Host for PluginHost {
@@ -82,6 +85,17 @@ impl crate::api::plugin_api::repl::api::http_client::Host for PluginHost {
     }
 }
 
+///
+impl crate::api::plugin_api::repl::api::host_state_plugin::Host for PluginHost {
+    async fn get_repl_var(&mut self, key: String) -> Option<String> {
+        self.repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock")
+            .get(&key)
+            .cloned()
+    }
+}
+
 /// It is necessary to implement this trait on PluginHost because other parts rely on it.
 impl crate::api::plugin_api::repl::api::transport::Host for PluginHost {
     // This trait has no methods, so no implementation needed
@@ -124,25 +138,14 @@ impl crate::api::host_api::repl::api::host_state::Host for WasiState {
         self.plugins_names.clone()
     }
 
-    async fn set_repl_vars(
-        &mut self,
-        vars: wasmtime::component::__internal::Vec<
-            crate::api::host_api::repl::api::transport::ReplVar,
-        >,
-    ) {
-        // Store environment variables in the WasiState
-        for var in vars {
-            self.repl_vars.insert(var.key.clone(), var.value.clone());
-            println!("Setting repl var: {} = {}", var.key, var.value);
-        }
-    }
-
     async fn get_repl_vars(
         &mut self,
     ) -> wasmtime::component::__internal::Vec<crate::api::host_api::repl::api::transport::ReplVar>
     {
         // Return the stored environment variables
         self.repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock")
             .iter()
             .map(
                 |(key, value)| crate::api::host_api::repl::api::transport::ReplVar {
@@ -155,6 +158,9 @@ impl crate::api::host_api::repl::api::host_state::Host for WasiState {
 
     async fn set_repl_var(&mut self, var: crate::api::host_api::repl::api::transport::ReplVar) {
         // Set a single environment variable
-        self.repl_vars.insert(var.key.clone(), var.value.clone());
+        self.repl_vars
+            .lock()
+            .expect("Failed to acquire repl_vars lock")
+            .insert(var.key.clone(), var.value.clone());
     }
 }
diff --git a/crates/pluginlab/tests/e2e_cli_host.rs b/crates/pluginlab/tests/e2e_cli_host.rs
index a068bc7..5c07b69 100644
--- a/crates/pluginlab/tests/e2e_cli_host.rs
+++ b/crates/pluginlab/tests/e2e_cli_host.rs
@@ -89,6 +89,40 @@ mod e2e_cli_host {
             .expect("Didn't get expected error output");
     }
 
+    #[test]
+    fn test_without_permission_allow_all() {
+        let project_root = find_project_root();
+        println!("Setting current directory to: {:?}", project_root);
+        std::env::set_current_dir(&project_root).unwrap();
+        let mut session = spawn(
+            &format!(
+                "{} --dir tmp/filesystem --allow-write",
+                &build_command(
+                    &["target/wasm32-wasip1/debug/plugin_tee.wasm"],
+                    "repl_logic_guest.wasm"
+                )
+            ),
+            Some(TEST_TIMEOUT),
+        )
+        .expect("Can't launch pluginlab");
+
+        session
+            .exp_string("[Host] Starting REPL host...")
+            .expect("Didn't see startup message");
+        session
+            .exp_string("[Host] Loading plugin:")
+            .expect("Didn't see plugin loading message");
+        session
+            .exp_string("repl(0)>")
+            .expect("Didn't see REPL prompt");
+        session
+            .send_line("tee documents/work/projects/alpha/.gitkeep")
+            .expect("Failed to send command");
+        session
+            .exp_string("permission denied - Failed to create file 'documents/work/projects/alpha/.gitkeep' - Operation not permitted (os error 63)\r\nrepl(1)>")
+            .expect("Didn't get expected output from tee plugin");
+    }
+
     #[test]
     fn test_with_wrong_version_of_plugin() {
         let crate_version = env!("CARGO_PKG_VERSION");
diff --git a/crates/pluginlab/tests/e2e_rust_plugins.rs b/crates/pluginlab/tests/e2e_rust_plugins.rs
index cc3959b..1f8ceb2 100644
--- a/crates/pluginlab/tests/e2e_rust_plugins.rs
+++ b/crates/pluginlab/tests/e2e_rust_plugins.rs
@@ -173,4 +173,142 @@ mod e2e_rust_plugins {
             .exp_string("# Documents")
             .expect("Didn't get expected contents of README.md");
     }
+
+    #[test]
+    fn test_tee_plugin_new_file() {
+        let project_root = find_project_root();
+        println!("Setting current directory to: {:?}", project_root);
+        std::env::set_current_dir(&project_root).unwrap();
+        let mut session = spawn(
+            &format!(
+                "{} --dir tmp/filesystem --allow-all",
+                &build_command(
+                    &["plugin_tee.wasm", "plugin_echo.wasm", "plugin_cat.wasm"],
+                    "repl_logic_guest.wasm"
+                )
+            ),
+            Some(TEST_TIMEOUT),
+        )
+        .expect("Can't launch pluginlab with plugin greet");
+
+        session
+            .exp_string("[Host] Starting REPL host...")
+            .expect("Didn't see startup message");
+        session
+            .exp_string("[Host] Loading plugin:")
+            .expect("Didn't see plugin loading message");
+        session
+            .exp_string("repl(0)>")
+            .expect("Didn't see REPL prompt");
+        session
+            .send_line("echo hello")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected output from echo plugin");
+        session
+            .send_line("tee hello.txt")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected output from tee plugin");
+        session
+            .send_line("cat hello.txt")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected contents of hello.txt");
+    }
+
+    #[test]
+    fn test_tee_plugin_replace_file() {
+        let project_root = find_project_root();
+        println!("Setting current directory to: {:?}", project_root);
+        std::env::set_current_dir(&project_root).unwrap();
+        let mut session = spawn(
+            &format!(
+                "{} --dir tmp/filesystem --allow-all",
+                &build_command(
+                    &["plugin_tee.wasm", "plugin_echo.wasm", "plugin_cat.wasm"],
+                    "repl_logic_guest.wasm"
+                )
+            ),
+            Some(TEST_TIMEOUT),
+        )
+        .expect("Can't launch pluginlab with plugin greet");
+
+        session
+            .exp_string("[Host] Starting REPL host...")
+            .expect("Didn't see startup message");
+        session
+            .exp_string("[Host] Loading plugin:")
+            .expect("Didn't see plugin loading message");
+        session
+            .exp_string("repl(0)>")
+            .expect("Didn't see REPL prompt");
+        session
+            .send_line("echo hello")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected output from echo plugin");
+        session
+            .send_line("tee documents/notes.txt")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected output from tee plugin");
+        session
+            .send_line("cat documents/notes.txt")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected contents of hello.txt");
+    }
+
+    #[test]
+    fn test_tee_plugin_append_file() {
+        let project_root = find_project_root();
+        println!("Setting current directory to: {:?}", project_root);
+        std::env::set_current_dir(&project_root).unwrap();
+        let mut session = spawn(
+            &format!(
+                "{} --dir tmp/filesystem --allow-all",
+                &build_command(
+                    &["plugin_tee.wasm", "plugin_echo.wasm", "plugin_cat.wasm"],
+                    "repl_logic_guest.wasm"
+                )
+            ),
+            Some(TEST_TIMEOUT),
+        )
+        .expect("Can't launch pluginlab with plugin greet");
+
+        session
+            .exp_string("[Host] Starting REPL host...")
+            .expect("Didn't see startup message");
+        session
+            .exp_string("[Host] Loading plugin:")
+            .expect("Didn't see plugin loading message");
+        session
+            .exp_string("repl(0)>")
+            .expect("Didn't see REPL prompt");
+        session
+            .send_line("echo hello")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected output from echo plugin");
+        session
+            .send_line("tee -a documents/work/projects/alpha/.gitkeep")
+            .expect("Failed to send command");
+        session
+            .exp_string("hello\r\nrepl(0)>")
+            .expect("Didn't get expected output from tee plugin");
+        session
+            .send_line("cat documents/work/projects/alpha/.gitkeep")
+            .expect("Failed to send command");
+        session
+            .exp_string("# This file ensures the alpha directory is tracked in git\r\n# Deep nested directory for testing\r\n\r\nhello\r\nrepl(0)>")
+            .expect("Didn't get expected contents of .gitkeep");
+    }
 }
diff --git a/crates/pluginlab/wit/host-api.wit b/crates/pluginlab/wit/host-api.wit
index ae9e483..df765d0 100644
--- a/crates/pluginlab/wit/host-api.wit
+++ b/crates/pluginlab/wit/host-api.wit
@@ -5,7 +5,6 @@ interface host-state {
   use transport.{repl-var};
 
   get-plugins-names: func() -> list<string>;
-  set-repl-vars: func(vars: list<repl-var>);
   get-repl-vars: func() -> list<repl-var>;
   set-repl-var: func(var: repl-var);
 }
diff --git a/crates/pluginlab/wit/plugin-api.wit b/crates/pluginlab/wit/plugin-api.wit
index 211a0b4..df40892 100644
--- a/crates/pluginlab/wit/plugin-api.wit
+++ b/crates/pluginlab/wit/plugin-api.wit
@@ -23,7 +23,12 @@ interface http-client {
   get: func(url: string, headers: list<http-header>) -> result<http-response, string>;
 }
 
+interface host-state-plugin {
+  get-repl-var: func(key: string) -> option<string>;
+}
+
 world plugin-api {
   import http-client;
+  import host-state-plugin;
   export plugin;
 }
diff --git a/packages/web-host/package.json b/packages/web-host/package.json
index b6b9878..50bd797 100644
--- a/packages/web-host/package.json
+++ b/packages/web-host/package.json
@@ -14,6 +14,7 @@
     "preview": "vite preview --host",
     "lint": "biome check .",
     "lint:fix": "biome check --write .",
+    "list-public-wasm-names": "ls -1 public/plugins/*.wasm|sed 's/.wasm//'|sed 's#public/plugins/##'",
     "typecheck": "tsc --noEmit -p tsconfig.app.json",
     "prepareVirtualFs": "node --experimental-strip-types --no-warnings ./clis/prepareFilesystem.ts --path fixtures/filesystem --format ts > src/wasm/virtualFs.ts; biome format --write ./src/wasm/virtualFs.ts",
     "test:e2e:all": "playwright test",
@@ -22,14 +23,7 @@
     "test:e2e:ui:preview": "BASE_URL=http://localhost:4173/webassembly-component-model-experiments npm run test:e2e:ui",
     "test:e2e:report": "playwright show-report",
     "test:e2e:like-in-ci": "CI=true GITHUB_ACTIONS=true WAIT_FOR_SERVER_AT_URL=http://localhost:4173/webassembly-component-model-experiments/ npm run test:e2e:all:preview",
-    "wasm:transpile:plugin-echo": "jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/plugin_echo.wasm -o ./src/wasm/generated/plugin_echo/transpiled",
-    "wasm:transpile:plugin-weather": "jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/plugin_weather.wasm -o ./src/wasm/generated/plugin_weather/transpiled",
-    "wasm:transpile:plugin-greet": "jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/plugin_greet.wasm -o ./src/wasm/generated/plugin_greet/transpiled",
-    "wasm:transpile:plugin-ls": "jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/plugin_ls.wasm -o ./src/wasm/generated/plugin_ls/transpiled",
-    "wasm:transpile:plugin-cat": "jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/plugin_cat.wasm -o ./src/wasm/generated/plugin_cat/transpiled",
-    "wasm:transpile:plugin-echoc": "jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/plugin-echo-c.wasm -o ./src/wasm/generated/plugin-echo-c/transpiled",
-    "wasm:transpile:repl-logic-guest": "jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/repl_logic_guest.wasm -o ./src/wasm/generated/repl_logic_guest/transpiled",
-    "wasm:transpile": "npm run wasm:transpile:plugin-echo && npm run wasm:transpile:plugin-weather && npm run wasm:transpile:plugin-greet && npm run wasm:transpile:plugin-ls && npm run wasm:transpile:plugin-cat && npm run wasm:transpile:plugin-echoc && npm run wasm:transpile:repl-logic-guest",
+    "wasm:transpile": "npm run list-public-wasm-names --silent|xargs -I {} jco transpile --no-nodejs-compat --no-namespaced-exports public/plugins/{}.wasm -o ./src/wasm/generated/{}/transpiled",
     "wit-types:host-api": "jco types --world-name host-api --out-dir ./src/types/generated ../../crates/pluginlab/wit",
     "wit-types:plugin-api": "jco types --world-name plugin-api --out-dir ./src/types/generated ../../crates/pluginlab/wit",
     "wit-types": "npm run wit-types:clean && npm run wit-types:host-api && npm run wit-types:plugin-api && biome format --write ./src/types/generated",
diff --git a/packages/web-host/src/types/generated/interfaces/repl-api-host-state-plugin.d.ts b/packages/web-host/src/types/generated/interfaces/repl-api-host-state-plugin.d.ts
new file mode 100644
index 0000000..fb9ff85
--- /dev/null
+++ b/packages/web-host/src/types/generated/interfaces/repl-api-host-state-plugin.d.ts
@@ -0,0 +1,2 @@
+/** @module Interface repl:api/host-state-plugin **/
+export function getReplVar(key: string): string | undefined;
diff --git a/packages/web-host/src/types/generated/interfaces/repl-api-host-state.d.ts b/packages/web-host/src/types/generated/interfaces/repl-api-host-state.d.ts
index d53a2ee..79284e2 100644
--- a/packages/web-host/src/types/generated/interfaces/repl-api-host-state.d.ts
+++ b/packages/web-host/src/types/generated/interfaces/repl-api-host-state.d.ts
@@ -1,6 +1,5 @@
 /** @module Interface repl:api/host-state **/
 export function getPluginsNames(): Array<string>;
-export function setReplVars(vars: Array<ReplVar>): void;
 export function getReplVars(): Array<ReplVar>;
 export function setReplVar(var_: ReplVar): void;
 export type ReadlineResponse =
diff --git a/packages/web-host/src/types/generated/plugin-api.d.ts b/packages/web-host/src/types/generated/plugin-api.d.ts
index bf02cd4..f9ac334 100644
--- a/packages/web-host/src/types/generated/plugin-api.d.ts
+++ b/packages/web-host/src/types/generated/plugin-api.d.ts
@@ -1,4 +1,5 @@
 // world repl:api/plugin-api
+export type * as ReplApiHostStatePlugin from "./interfaces/repl-api-host-state-plugin.js"; // import repl:api/host-state-plugin
 export type * as ReplApiHttpClient from "./interfaces/repl-api-http-client.js"; // import repl:api/http-client
 export type * as ReplApiTransport from "./interfaces/repl-api-transport.js"; // import repl:api/transport
 export * as plugin from "./interfaces/repl-api-plugin.js"; // export repl:api/plugin
diff --git a/packages/web-host/src/wasm/host/host-state-plugin.ts b/packages/web-host/src/wasm/host/host-state-plugin.ts
new file mode 100644
index 0000000..9d29fc3
--- /dev/null
+++ b/packages/web-host/src/wasm/host/host-state-plugin.ts
@@ -0,0 +1,5 @@
+import { getReplVars } from "./host-state";
+
+export function getReplVar(key: string): string | undefined {
+  return getReplVars().find((replVar) => replVar.key === key)?.value;
+}
diff --git a/packages/web-host/src/wasm/host/host-state.ts b/packages/web-host/src/wasm/host/host-state.ts
index 4d7e1e4..188d1cf 100644
--- a/packages/web-host/src/wasm/host/host-state.ts
+++ b/packages/web-host/src/wasm/host/host-state.ts
@@ -23,9 +23,3 @@ export function getReplVars(): ReplVar[] {
 export function setReplVar({ key, value }: { key: string; value: string }) {
   internalState.replVars.set(key, value);
 }
-
-export function setReplVars(vars: ReplVar[]) {
-  for (const { key, value } of vars) {
-    internalState.replVars.set(key, value);
-  }
-}
diff --git a/packages/web-host/tsconfig.app.json b/packages/web-host/tsconfig.app.json
index 3e90edf..3a2dc0f 100644
--- a/packages/web-host/tsconfig.app.json
+++ b/packages/web-host/tsconfig.app.json
@@ -24,7 +24,8 @@
     "noUncheckedSideEffectImports": true,
     "paths": {
       "repl:api/host-state": ["./src/wasm/host/host-state.ts"],
-      "repl:api/http-client": ["./src/wasm/host/http-client.ts"]
+      "repl:api/http-client": ["./src/wasm/host/http-client.ts"],
+      "repl:api/host-state-plugin": ["./src/wasm/host/host-state-plugin.ts"]
     }
   },
   "include": ["src", "clis"]
diff --git a/packages/web-host/vite.config.ts b/packages/web-host/vite.config.ts
index 9032152..c0730a9 100644
--- a/packages/web-host/vite.config.ts
+++ b/packages/web-host/vite.config.ts
@@ -1,6 +1,6 @@
+import path from "node:path";
 import tailwindcss from "@tailwindcss/vite";
 import react from "@vitejs/plugin-react";
-import path from "path";
 import { defineConfig } from "vite";
 
 // https://vite.dev/config/
@@ -16,6 +16,10 @@ export default defineConfig({
         __dirname,
         "./src/wasm/host/host-state.ts",
       ),
+      "repl:api/host-state-plugin": path.resolve(
+        __dirname,
+        "./src/wasm/host/host-state-plugin.ts",
+      ),
     },
   },
   base: "/webassembly-component-model-experiments/",
diff --git a/scripts/prepare-wasm-files.sh b/scripts/prepare-wasm-files.sh
index 94ac01f..0650c5f 100755
--- a/scripts/prepare-wasm-files.sh
+++ b/scripts/prepare-wasm-files.sh
@@ -40,6 +40,7 @@ prepare_wasm_files() {
         "target/wasm32-wasip1/$mode/plugin_ls.wasm"
         "target/wasm32-wasip1/$mode/plugin_cat.wasm"
         "target/wasm32-wasip1/$mode/plugin_weather.wasm"
+        "target/wasm32-wasip1/$mode/plugin_tee.wasm"
         "c_modules/plugin-echo/plugin-echo-c.wasm"
         "target/wasm32-wasip1/$mode/repl_logic_guest.wasm"
     )