diff --git a/rpc-toolkit-macro-internals/src/command/parse.rs b/rpc-toolkit-macro-internals/src/command/parse.rs
index d2bf990..fe45a03 100644
--- a/rpc-toolkit-macro-internals/src/command/parse.rs
+++ b/rpc-toolkit-macro-internals/src/command/parse.rs
@@ -966,7 +966,7 @@ pub fn parse_param_attrs(item: &mut ItemFn) -> Result<Vec<ParamType>> {
                             attr.span(),
                             "`context` and `response` are mutually exclusive",
                         ));
-                    } else if matches!(ty, ParamType::Context(_)) {
+                    } else if matches!(ty, ParamType::ParentData(_)) {
                         return Err(Error::new(
                             attr.span(),
                             "`parent_data` and `response` are mutually exclusive",
diff --git a/rpc-toolkit/src/cli.rs b/rpc-toolkit/src/cli.rs
index 4502d5b..232002f 100644
--- a/rpc-toolkit/src/cli.rs
+++ b/rpc-toolkit/src/cli.rs
@@ -1,17 +1,18 @@
-use std::ffi::OsString;
+use std::{ffi::OsString, marker::PhantomData};
 
 use clap::{ArgMatches, CommandFactory, FromArgMatches};
-use futures::future::BoxFuture;
+use futures::{future::BoxFuture, never::Never};
 use futures::{Future, FutureExt};
 use imbl_value::Value;
 use reqwest::{Client, Method};
 use serde::de::DeserializeOwned;
 use serde::Serialize;
+use std::marker::PhantomData;
 use tokio::io::{AsyncBufReadExt, AsyncRead, AsyncWrite, AsyncWriteExt, BufReader};
 use url::Url;
 use yajrc::{Id, RpcError};
 
-use crate::command::ParentCommand;
+use crate::{command::ParentCommand, CliBindings, EmptyHandler, HandleArgs, Handler, NoParams};
 // use crate::command::{AsyncCommand, DynCommand, LeafCommand, ParentInfo};
 use crate::util::{combine, internal_error, invalid_params, parse_error};
 // use crate::{CliBindings, SyncCommand};
@@ -60,11 +61,47 @@ type RpcResponse<'a> = yajrc::RpcResponse<GenericRpcMethod<'static>>;
 //     }
 // }
 
-struct CliApp<Context: crate::Context>(ParentCommand<Context>);
+struct RootCliHandler<Context: crate::Context, Config: CommandFactory + FromArgMatches>(
+    PhantomData<(Context, Config)>,
+);
+impl<Context: crate::Context, Config: CommandFactory + FromArgMatches> Handler<Context>
+    for RootCliHandler<Context, Config>
+{
+    type Params = NoParams;
+    type InheritedParams = NoParams;
+    type Ok = Never;
+    type Err = RpcError;
+    fn handle_sync(&self, _: HandleArgs<Context, Self>) -> Result<Self::Ok, Self::Err> {
+        Err(yajrc::METHOD_NOT_FOUND_ERROR)
+    }
+}
+impl<Context: crate::Context, Config: CommandFactory + FromArgMatches> CliBindings
+    for RootCliHandler<Context, Config>
+{
+    fn cli_command(&self) -> clap::Command {
+        Config::command()
+    }
+
+    fn cli_parse(
+        &self,
+        matches: &ArgMatches,
+    ) -> Result<(std::collections::VecDeque<&'static str>, Value), clap::Error> {
+    }
+
+    fn cli_display(
+        &self,
+        handle_args: HandleArgs<Context, Self>,
+        result: Self::Ok,
+    ) -> Result<(), Self::Err> {
+        todo!()
+    }
+}
+
+struct CliApp<Context: crate::Context, Config: CommandFactory + FromArgMatches>(
+    ParentCommand<Context, EmptyHandler<Config>>,
+);
 impl<Context: crate::Context> CliApp<Context> {
-    pub fn new<Cmd: FromArgMatches + CommandFactory + Serialize>(
-        commands: Vec<DynCommand<Context>>,
-    ) -> Self {
+    pub fn new(commands: Vec<DynCommand<Context>>) -> Self {
         Self {
             cli: CliBindings::from_parent::<Cmd>(),
             commands,
diff --git a/rpc-toolkit/src/context.rs b/rpc-toolkit/src/context.rs
index 2c47228..fd7016e 100644
--- a/rpc-toolkit/src/context.rs
+++ b/rpc-toolkit/src/context.rs
@@ -1,7 +1,7 @@
+use std::any::Any;
 use tokio::runtime::Handle;
 
-pub trait Context: Send + 'static {
-    type Metadata: Default + Send + Sync;
+pub trait Context: Any + Send + 'static {
     fn runtime(&self) -> Handle {
         Handle::current()
     }
diff --git a/rpc-toolkit/src/handler.rs b/rpc-toolkit/src/handler.rs
index 91756f3..2131fe6 100644
--- a/rpc-toolkit/src/handler.rs
+++ b/rpc-toolkit/src/handler.rs
@@ -9,14 +9,14 @@ use yajrc::RpcError;
 
 use crate::util::{combine, internal_error, invalid_params, Flat};
 
-struct HandleAnyArgs<Context> {
-    context: Context,
+struct HandleAnyArgs {
+    context: Box<dyn crate::Context>,
     parent_method: Vec<&'static str>,
     method: VecDeque<&'static str>,
     params: Value,
 }
-impl<Context: crate::Context> HandleAnyArgs<Context> {
-    fn downcast<H>(self) -> Result<HandleArgs<Context, H>, imbl_value::Error>
+impl HandleAnyArgs {
+    fn downcast<Context: crate::Context, H>(self) -> Result<HandleArgs<Context, H>, imbl_value::Error>
     where
         H: Handler<Context>,
         H::Params: DeserializeOwned,
@@ -36,6 +36,9 @@ impl<Context: crate::Context> HandleAnyArgs<Context> {
             inherited_params: imbl_value::from_value(params.clone())?,
         })
     }
+}rams.clone())?,
+        })
+    }
 }
 
 #[async_trait::async_trait]
@@ -294,7 +297,9 @@ pub struct NoParams {}
 #[derive(Debug, Clone, Copy, Deserialize, Serialize, Parser)]
 enum Never {}
 
-struct EmptyHandler<Params, InheritedParams>(PhantomData<(Params, InheritedParams)>);
+pub(crate) struct EmptyHandler<Params = NoParams, InheritedParams = NoParams>(
+    PhantomData<(Params, InheritedParams)>,
+);
 impl<Context: crate::Context, Params, InheritedParams> Handler<Context>
     for EmptyHandler<Params, InheritedParams>
 {
@@ -307,14 +312,13 @@ impl<Context: crate::Context, Params, InheritedParams> Handler<Context>
     }
 }
 
-pub struct ParentHandler<Context: crate::Context, H: Handler<Context>> {
+pub struct ParentHandler<Context: crate::Context, H: Handler<Context> = EmptyHandler> {
     handler: H,
     subcommands: BTreeMap<&'static str, DynHandler<Context>>,
 }
-impl<Context: crate::Context, Params, InheritedParams>
-    ParentHandler<Context, EmptyHandler<Params, InheritedParams>>
+impl<Context: crate::Context> ParentHandler<Context>
 where
-    EmptyHandler<Params, InheritedParams>: CliBindings<Context>,
+    EmptyHandler: CliBindings<Context>,
 {
     pub fn new() -> Self {
         Self {
diff --git a/rpc-toolkit/src/lib.rs b/rpc-toolkit/src/lib.rs
index e69e045..da703a3 100644
--- a/rpc-toolkit/src/lib.rs
+++ b/rpc-toolkit/src/lib.rs
@@ -1,4 +1,4 @@
-pub use cli::*;
+// pub use cli::*;
 // pub use command::*;
 pub use context::Context;
 pub use handler::*;
@@ -24,15 +24,15 @@ pub use handler::*;
 ///
 /// See also: [arg](rpc_toolkit_macro::arg), [context](rpc_toolkit_macro::context)
 pub use rpc_toolkit_macro::command;
-pub use server::*;
+// pub use server::*;
 pub use {clap, futures, hyper, reqwest, serde, serde_json, tokio, url, yajrc};
 
-mod cli;
-mod command;
+// mod cli;
+// mod command;
 mod handler;
 // pub mod command_helpers;
 mod context;
 // mod metadata;
 // pub mod rpc_server_helpers;
-mod server;
+// mod server;
 mod util;
diff --git a/rpc-toolkit/tests/handler.rs b/rpc-toolkit/tests/handler.rs
new file mode 100644
index 0000000..d0c643f
--- /dev/null
+++ b/rpc-toolkit/tests/handler.rs
@@ -0,0 +1,72 @@
+use std::sync::Arc;
+
+use clap::Parser;
+use rpc_toolkit::{Context, ParentHandler};
+use tokio::{
+    runtime::{Handle, Runtime},
+    sync::OnceCell,
+};
+use url::Url;
+use yajrc::RpcError;
+
+#[derive(Parser)]
+#[command(
+    name = "test-cli",
+    version,
+    author,
+    about = "This is a test cli application."
+)]
+struct CliConfig {
+    host: Option<Url>,
+    config: Option<PathBuf>,
+}
+impl CliConfig {
+    fn load_rec(&mut self) -> Result<(), RpcError> {
+        if let Some(path) = self.config.as_ref() {
+            let extra_cfg =
+                serde_json::from_str(&std::fs::read_to_string(path).map_err(internal_error)?)
+                    .map_err(internal_error)?;
+            extra_cfg.load_rec()?;
+            self.merge_with(extra_cfg);
+        }
+        Ok(())
+    }
+    fn merge_with(&mut self, extra: Self) {
+        if self.host.is_none() {
+            self.host = extra.host;
+        }
+    }
+}
+
+struct CliContextSeed {
+    host: Url,
+    rt: OnceCell<Runtime>,
+}
+#[derive(Clone)]
+struct CliContext(Arc<CliContextSeed>);
+impl Context for CliContext {
+    fn runtime(&self) -> Handle {
+        if self.rt.get().is_none() {
+            self.rt.set(Runtime::new().unwrap()).unwrap();
+        }
+        self.rt.get().unwrap().handle()
+    }
+}
+
+fn make_cli() -> CliApp<CliConfig> {
+    CliApp::new::<_, CliConfig>(|mut config| {
+        config.load_rec()?;
+        Ok(CliContext(Arc::new(CliContextSeed {
+            host: config
+                .host
+                .unwrap_or_else("http://localhost:8080/rpc".parse().unwrap()),
+            rt: OnceCell::new(),
+        })))
+    })
+    .subcommands(make_api())
+    .subcommands(ParentHandler::new().subcommand("hello", from_fn(|| Ok("world"))));
+}
+
+fn make_api() -> ParentHandler<CliContext> {
+    ParentHandler::new().subcommand("hello", from_fn(|| Ok("world")))
+}
diff --git a/rpc-toolkit/tests/test.rs b/rpc-toolkit/tests/test.rs
index 8c8b206..bc555b0 100644
--- a/rpc-toolkit/tests/test.rs
+++ b/rpc-toolkit/tests/test.rs
@@ -1,109 +1,109 @@
-use std::path::PathBuf;
+// use std::path::PathBuf;
 
-use clap::Parser;
-use futures::Future;
-use rpc_toolkit::{
-    AsyncCommand, CliContextSocket, Command, Contains, Context, DynCommand, LeafCommand, NoParent,
-    ParentCommand, ParentInfo, Server, ShutdownHandle,
-};
-use serde::{Deserialize, Serialize};
-use tokio::net::UnixStream;
-use yajrc::RpcError;
+// use clap::Parser;
+// use futures::Future;
+// use rpc_toolkit::{
+//     AsyncCommand, CliContextSocket, Command, Contains, Context, DynCommand, LeafCommand, NoParent,
+//     ParentCommand, ParentInfo, Server, ShutdownHandle,
+// };
+// use serde::{Deserialize, Serialize};
+// use tokio::net::UnixStream;
+// use yajrc::RpcError;
 
-struct ServerContext;
-impl Context for ServerContext {
-    type Metadata = ();
-}
+// struct ServerContext;
+// impl Context for ServerContext {
+//     type Metadata = ();
+// }
 
-struct CliContext(PathBuf);
-impl Context for CliContext {
-    type Metadata = ();
-}
-#[async_trait::async_trait]
-impl CliContextSocket for CliContext {
-    type Stream = UnixStream;
-    async fn connect(&self) -> std::io::Result<Self::Stream> {
-        UnixStream::connect(&self.0).await
-    }
-}
-#[async_trait::async_trait]
-impl rpc_toolkit::CliContext for CliContext {
-    async fn call_remote(
-        &self,
-        method: &str,
-        params: imbl_value::Value,
-    ) -> Result<imbl_value::Value, RpcError> {
-        <Self as CliContextSocket>::call_remote(self, method, params).await
-    }
-}
+// struct CliContext(PathBuf);
+// impl Context for CliContext {
+//     type Metadata = ();
+// }
+// #[async_trait::async_trait]
+// impl CliContextSocket for CliContext {
+//     type Stream = UnixStream;
+//     async fn connect(&self) -> std::io::Result<Self::Stream> {
+//         UnixStream::connect(&self.0).await
+//     }
+// }
+// #[async_trait::async_trait]
+// impl rpc_toolkit::CliContext for CliContext {
+//     async fn call_remote(
+//         &self,
+//         method: &str,
+//         params: imbl_value::Value,
+//     ) -> Result<imbl_value::Value, RpcError> {
+//         <Self as CliContextSocket>::call_remote(self, method, params).await
+//     }
+// }
 
-async fn run_server() {
-    Server::new(
-        vec![
-            DynCommand::from_parent::<Group>(Contains::none()),
-            DynCommand::from_async::<Thing1>(Contains::none()),
-            // DynCommand::from_async::<Thing2>(Contains::none()),
-            // DynCommand::from_sync::<Thing3>(Contains::none()),
-            // DynCommand::from_sync::<Thing4>(Contains::none()),
-        ],
-        || async { Ok(ServerContext) },
-    )
-    .run_unix("./test.sock", |e| eprintln!("{e}"))
-    .unwrap()
-    .1
-    .await
-}
+// async fn run_server() {
+//     Server::new(
+//         vec![
+//             DynCommand::from_parent::<Group>(Contains::none()),
+//             DynCommand::from_async::<Thing1>(Contains::none()),
+//             // DynCommand::from_async::<Thing2>(Contains::none()),
+//             // DynCommand::from_sync::<Thing3>(Contains::none()),
+//             // DynCommand::from_sync::<Thing4>(Contains::none()),
+//         ],
+//         || async { Ok(ServerContext) },
+//     )
+//     .run_unix("./test.sock", |e| eprintln!("{e}"))
+//     .unwrap()
+//     .1
+//     .await
+// }
 
-#[derive(Debug, Deserialize, Serialize, Parser)]
-struct Group {
-    #[arg(short, long)]
-    verbose: bool,
-}
-impl Command for Group {
-    const NAME: &'static str = "group";
-    type Parent = NoParent;
-}
-impl<Ctx> ParentCommand<Ctx> for Group
-where
-    Ctx: Context,
-    // SubThing: AsyncCommand<Ctx>,
-    Thing1: AsyncCommand<Ctx>,
-{
-    fn subcommands(chain: rpc_toolkit::ParentChain<Self>) -> Vec<DynCommand<Ctx>> {
-        vec![
-            // DynCommand::from_async::<SubThing>(chain.child()),
-            DynCommand::from_async::<Thing1>(Contains::none()),
-        ]
-    }
-}
+// #[derive(Debug, Deserialize, Serialize, Parser)]
+// struct Group {
+//     #[arg(short, long)]
+//     verbose: bool,
+// }
+// impl Command for Group {
+//     const NAME: &'static str = "group";
+//     type Parent = NoParent;
+// }
+// impl<Ctx> ParentCommand<Ctx> for Group
+// where
+//     Ctx: Context,
+//     // SubThing: AsyncCommand<Ctx>,
+//     Thing1: AsyncCommand<Ctx>,
+// {
+//     fn subcommands(chain: rpc_toolkit::ParentChain<Self>) -> Vec<DynCommand<Ctx>> {
+//         vec![
+//             // DynCommand::from_async::<SubThing>(chain.child()),
+//             DynCommand::from_async::<Thing1>(Contains::none()),
+//         ]
+//     }
+// }
 
-#[derive(Debug, Deserialize, Serialize, Parser)]
-struct Thing1 {
-    thing: String,
-}
-impl Command for Thing1 {
-    const NAME: &'static str = "thing1";
-    type Parent = NoParent;
-}
-impl LeafCommand<ServerContext> for Thing1 {
-    type Ok = String;
-    type Err = RpcError;
-    fn display(self, _: ServerContext, _: rpc_toolkit::ParentInfo<Self::Parent>, res: Self::Ok) {
-        println!("{}", res);
-    }
-}
-#[async_trait::async_trait]
-impl AsyncCommand<ServerContext> for Thing1 {
-    async fn implementation(
-        self,
-        _: ServerContext,
-        _: ParentInfo<Self::Parent>,
-    ) -> Result<Self::Ok, Self::Err> {
-        Ok(format!("Thing1 is {}", self.thing))
-    }
-}
+// #[derive(Debug, Deserialize, Serialize, Parser)]
+// struct Thing1 {
+//     thing: String,
+// }
+// impl Command for Thing1 {
+//     const NAME: &'static str = "thing1";
+//     type Parent = NoParent;
+// }
+// impl LeafCommand<ServerContext> for Thing1 {
+//     type Ok = String;
+//     type Err = RpcError;
+//     fn display(self, _: ServerContext, _: rpc_toolkit::ParentInfo<Self::Parent>, res: Self::Ok) {
+//         println!("{}", res);
+//     }
+// }
+// #[async_trait::async_trait]
+// impl AsyncCommand<ServerContext> for Thing1 {
+//     async fn implementation(
+//         self,
+//         _: ServerContext,
+//         _: ParentInfo<Self::Parent>,
+//     ) -> Result<Self::Ok, Self::Err> {
+//         Ok(format!("Thing1 is {}", self.thing))
+//     }
+// }
 
-#[tokio::test]
-async fn test() {
-    let server = tokio::spawn(run_server());
-}
+// #[tokio::test]
+// async fn test() {
+//     let server = tokio::spawn(run_server());
+// }