diff --git a/scarb/src/compiler/plugin/proc_macro/ffi.rs b/scarb/src/compiler/plugin/proc_macro/ffi.rs
index bb358ade9..62c4eb1da 100644
--- a/scarb/src/compiler/plugin/proc_macro/ffi.rs
+++ b/scarb/src/compiler/plugin/proc_macro/ffi.rs
@@ -134,6 +134,15 @@ impl ProcMacroInstance {
             .collect()
     }
 
+    pub fn inline_macros(&self) -> Vec<String> {
+        self.get_expansions()
+            .iter()
+            .filter(|e| e.kind == ExpansionKind::Inline)
+            .map(|e| e.name.clone())
+            .map(Into::into)
+            .collect()
+    }
+
     /// Apply expansion to token stream.
     ///
     /// This function implements the actual calls to functions from the dynamic library.
diff --git a/scarb/src/compiler/plugin/proc_macro/host.rs b/scarb/src/compiler/plugin/proc_macro/host.rs
index c32ff0eed..4708b18b1 100644
--- a/scarb/src/compiler/plugin/proc_macro/host.rs
+++ b/scarb/src/compiler/plugin/proc_macro/host.rs
@@ -1101,4 +1101,8 @@ impl ProcMacroHost {
     pub fn into_plugin(self) -> Result<ProcMacroHostPlugin> {
         ProcMacroHostPlugin::try_new(self.macros)
     }
+
+    pub fn macros(&self) -> &[Arc<ProcMacroInstance>] {
+        &self.macros
+    }
 }
diff --git a/scarb/src/ops/proc_macro_server/json_rpc.rs b/scarb/src/ops/proc_macro_server/json_rpc.rs
index e63d8ae2a..ceee14bd8 100644
--- a/scarb/src/ops/proc_macro_server/json_rpc.rs
+++ b/scarb/src/ops/proc_macro_server/json_rpc.rs
@@ -1,4 +1,12 @@
+use crate::compiler::plugin::proc_macro::ProcMacroHost;
+use anyhow::Result;
+use proc_macro_server_api::Method;
 use serde::Serialize;
+use std::sync::Arc;
+
+pub trait Handler: Method {
+    fn handle(proc_macros: Arc<ProcMacroHost>, params: Self::Params) -> Result<Self::Response>;
+}
 
 #[derive(Serialize)]
 pub struct ErrResponse {
diff --git a/scarb/src/ops/proc_macro_server/methods/defined_macros.rs b/scarb/src/ops/proc_macro_server/methods/defined_macros.rs
new file mode 100644
index 000000000..097f88d09
--- /dev/null
+++ b/scarb/src/ops/proc_macro_server/methods/defined_macros.rs
@@ -0,0 +1,27 @@
+use crate::{
+    compiler::plugin::proc_macro::ProcMacroHost, ops::proc_macro_server::json_rpc::Handler,
+};
+use anyhow::Result;
+use proc_macro_server_api::methods::defined_macros::{DefinedMacros, DefinedMacrosResponse};
+use std::sync::Arc;
+
+impl Handler for DefinedMacros {
+    fn handle(proc_macros: Arc<ProcMacroHost>, _params: Self::Params) -> Result<Self::Response> {
+        let mut response: DefinedMacrosResponse = proc_macros
+            .macros()
+            .into_iter()
+            .map(|e| DefinedMacrosResponse {
+                attributes: e.declared_attributes(),
+                inline_macros: e.inline_macros(),
+                derives: e.declared_derives(),
+                executables: e.executable_attributes(),
+            })
+            .sum();
+
+        response
+            .attributes
+            .retain(|attr| !response.executables.contains(attr));
+
+        Ok(response)
+    }
+}
diff --git a/scarb/src/ops/proc_macro_server/methods/mod.rs b/scarb/src/ops/proc_macro_server/methods/mod.rs
new file mode 100644
index 000000000..fea512b83
--- /dev/null
+++ b/scarb/src/ops/proc_macro_server/methods/mod.rs
@@ -0,0 +1 @@
+pub mod defined_macros;
diff --git a/scarb/src/ops/proc_macro_server/mod.rs b/scarb/src/ops/proc_macro_server/mod.rs
index 9b18af89d..1450b9620 100644
--- a/scarb/src/ops/proc_macro_server/mod.rs
+++ b/scarb/src/ops/proc_macro_server/mod.rs
@@ -1,25 +1,32 @@
 use crate::compiler::plugin::proc_macro::ProcMacroHost;
 use anyhow::{anyhow, Result};
 use connection::Connection;
-use json_rpc::ErrResponse;
-use proc_macro_server_api::RpcResponse;
+use json_rpc::{ErrResponse, Handler};
+use proc_macro_server_api::{methods::defined_macros::DefinedMacros, Method, RpcResponse};
+use serde_json::Value;
+use std::sync::Arc;
 
 mod connection;
 mod json_rpc;
+mod methods;
 
 pub fn start_proc_macro_server(proc_macros: ProcMacroHost) -> Result<()> {
     let connection = Connection::new();
+    let proc_macros = Arc::new(proc_macros);
 
     for i in 0..4 {
         let receiver = connection.receiver.clone();
         let sender = connection.sender.clone();
+        let proc_macros = proc_macros.clone();
 
         std::thread::Builder::new()
             .name(format!("proc-macro-server-worker-thread-{i}"))
             .spawn(move || {
                 for request in receiver {
                     let response = match request.method.as_str() {
-                        //TODO add method handlers
+                        DefinedMacros::METHOD => {
+                            run_handler::<DefinedMacros>(proc_macros.clone(), request.value)
+                        }
                         _ => Err(anyhow!("method not found")),
                     };
 
@@ -41,3 +48,8 @@ pub fn start_proc_macro_server(proc_macros: ProcMacroHost) -> Result<()> {
 
     Ok(())
 }
+
+fn run_handler<M: Handler>(proc_macros: Arc<ProcMacroHost>, value: Value) -> Result<Value> {
+    M::handle(proc_macros.clone(), serde_json::from_value(value).unwrap())
+        .map(|res| serde_json::to_value(res).unwrap())
+}