diff --git a/Cargo.lock b/Cargo.lock
index df93630..43bf35c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -24,6 +24,7 @@ dependencies = [
  "tokio-util",
  "tracing",
  "uuid",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index bb9c62d..10be4ce 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -80,6 +80,7 @@ rustc-hash = "2.1.1"
 shell-words = "1.1"
 strip-ansi-escapes = "0.2"
 tower-http = "0.6"
+windows-sys = "0.61"
 
 
 # Proc macros
diff --git a/src/agent-client-protocol/Cargo.toml b/src/agent-client-protocol/Cargo.toml
index cee6a44..1c657b3 100644
--- a/src/agent-client-protocol/Cargo.toml
+++ b/src/agent-client-protocol/Cargo.toml
@@ -54,6 +54,9 @@ async-process.workspace = true
 blocking.workspace = true
 shell-words.workspace = true
 
+[target.'cfg(windows)'.dependencies]
+windows-sys = { workspace = true, features = ["Win32_System_Threading"] }
+
 [dev-dependencies]
 agent-client-protocol-test.workspace = true
 clap.workspace = true
diff --git a/src/agent-client-protocol/src/acp_agent.rs b/src/agent-client-protocol/src/acp_agent.rs
index 1a1b2f0..e435051 100644
--- a/src/agent-client-protocol/src/acp_agent.rs
+++ b/src/agent-client-protocol/src/acp_agent.rs
@@ -162,6 +162,12 @@ impl AcpAgent {
                 for env_var in &stdio.env {
                     cmd.env(&env_var.name, &env_var.value);
                 }
+                #[cfg(windows)]
+                {
+                    use async_process::windows::CommandExt as _;
+
+                    cmd.creation_flags(windows_sys::Win32::System::Threading::CREATE_NO_WINDOW);
+                }
                 cmd.stdin(std::process::Stdio::piped())
                     .stdout(std::process::Stdio::piped())
                     .stderr(std::process::Stdio::piped());