diff --git a/.config/jp/tools/src/fs/grep_files_tests.rs b/.config/jp/tools/src/fs/grep_files_tests.rs
index 5ee9dc66..6c5d5774 100644
--- a/.config/jp/tools/src/fs/grep_files_tests.rs
+++ b/.config/jp/tools/src/fs/grep_files_tests.rs
@@ -119,7 +119,8 @@ async fn test_grep_files() {
 
         let matches = fs_grep_files(root, pattern.to_owned(), Some(5), paths)
             .await
-            .unwrap();
+            .unwrap()
+            .replace('\\', "/");
 
         assert_eq!(matches, expected.join(""), "test case: {name}");
     }
diff --git a/.config/jp/tools/src/fs/list_files.rs b/.config/jp/tools/src/fs/list_files.rs
index 9942fee3..0f496629 100644
--- a/.config/jp/tools/src/fs/list_files.rs
+++ b/.config/jp/tools/src/fs/list_files.rs
@@ -189,7 +189,15 @@ mod tests {
 
             let files = fs_list_files(root, prefixes, extensions).await.unwrap();
 
-            assert_eq!(files.into_files(), expected, "test case: {name}");
+            assert_eq!(
+                files
+                    .into_files()
+                    .into_iter()
+                    .map(|s| s.replace('\\', "/"))
+                    .collect::<Vec<_>>(),
+                expected,
+                "test case: {name}"
+            );
         }
     }
 
diff --git a/.config/jp/tools/src/fs/modify_file_tests.rs b/.config/jp/tools/src/fs/modify_file_tests.rs
index 3b1994f7..84519dec 100644
--- a/.config/jp/tools/src/fs/modify_file_tests.rs
+++ b/.config/jp/tools/src/fs/modify_file_tests.rs
@@ -123,8 +123,14 @@ fn test_validate_patterns() {
 
 #[test]
 fn test_validate_path() {
+    #[rustfmt::skip]
     let cases = [
+        #[cfg(unix)]
         ("absolute", "/absolute/path", Err("Path must be relative.")),
+
+        #[cfg(windows)]
+        ("absolute", "c:/absolute/path", Err("Path must be relative.")),
+
         ("relative", "src/main.rs", Ok(())),
     ];
 
diff --git a/crates/jp_cli/src/cmd/query/interrupt/signals.rs b/crates/jp_cli/src/cmd/query/interrupt/signals.rs
index 2d2236ea..544ef909 100644
--- a/crates/jp_cli/src/cmd/query/interrupt/signals.rs
+++ b/crates/jp_cli/src/cmd/query/interrupt/signals.rs
@@ -50,6 +50,7 @@ pub fn handle_streaming_signal(
     info!(?signal, "Received signal during streaming.");
 
     match signal {
+        #[cfg(any(unix, test))]
         SignalTo::Quit => {
             // Treat Quit like Stop: save partial content and exit gracefully.
             // This ensures we don't lose progress on hard quit signals.
@@ -81,6 +82,7 @@ pub fn handle_streaming_signal(
             }
         }
 
+        #[cfg(any(unix, test))]
         SignalTo::ReloadFromDisk => LoopAction::Continue,
     }
 }
@@ -140,6 +142,7 @@ pub fn handle_tool_signal(
     backend: &dyn PromptBackend,
 ) -> ToolSignalResult {
     match signal {
+        #[cfg(any(unix, test))]
         SignalTo::Quit => {
             // For hard quit during tool execution, we cancel and let the normal
             // flow handle persistence (responses will be cancelled).
@@ -177,6 +180,7 @@ pub fn handle_tool_signal(
             }
         }
 
+        #[cfg(any(unix, test))]
         SignalTo::ReloadFromDisk => ToolSignalResult::Continue,
     }
 }
diff --git a/crates/jp_cli/src/cmd/query/tool/renderer_tests.rs b/crates/jp_cli/src/cmd/query/tool/renderer_tests.rs
index fc633563..525287cd 100644
--- a/crates/jp_cli/src/cmd/query/tool/renderer_tests.rs
+++ b/crates/jp_cli/src/cmd/query/tool/renderer_tests.rs
@@ -1,5 +1,6 @@
 use std::{sync::Arc, time::Duration};
 
+use camino_tempfile::Utf8TempDir;
 use jp_config::{
     AppConfig,
     conversation::tool::{CommandConfigOrString, style::ParametersStyle},
@@ -228,9 +229,11 @@ async fn test_format_args_function_call() {
 #[tokio::test]
 async fn test_format_args_custom_with_echo() {
     let mut args = Map::new();
-    args.insert("path".into(), Value::String("/tmp/test.txt".into()));
+    let root = Utf8TempDir::new().unwrap();
+    let path = root.path().join("test.txt");
+    args.insert("path".into(), Value::String(path.into()));
     let style = ParametersStyle::Custom(CommandConfigOrString::String("echo custom-output".into()));
-    let result = format_args("my_tool", &args, &style, Utf8Path::new("/tmp"))
+    let result = format_args("my_tool", &args, &style, root.path())
         .await
         .unwrap();
     assert_eq!(result, ":\n\ncustom-output");
@@ -239,9 +242,11 @@ async fn test_format_args_custom_with_echo() {
 #[tokio::test]
 async fn test_format_args_custom_empty_output_returns_empty() {
     let mut args = Map::new();
-    args.insert("path".into(), Value::String("/tmp/test.txt".into()));
+    let root = Utf8TempDir::new().unwrap();
+    let path = root.path().join("test.txt");
+    args.insert("path".into(), Value::String(path.into()));
     let style = ParametersStyle::Custom(CommandConfigOrString::String("true".into()));
-    let result = format_args("my_tool", &args, &style, Utf8Path::new("/tmp"))
+    let result = format_args("my_tool", &args, &style, root.path())
         .await
         .unwrap();
     assert_eq!(result, "");
diff --git a/crates/jp_cli/src/cmd/query/turn/coordinator.rs b/crates/jp_cli/src/cmd/query/turn/coordinator.rs
index 1ee4902d..67d785d0 100644
--- a/crates/jp_cli/src/cmd/query/turn/coordinator.rs
+++ b/crates/jp_cli/src/cmd/query/turn/coordinator.rs
@@ -283,6 +283,7 @@ impl TurnCoordinator {
     ///
     /// Used when handling hard quit signals (SIGQUIT) where we want to save
     /// progress and exit gracefully without showing an interrupt menu.
+    #[cfg(any(unix, test))]
     pub fn force_complete(&mut self) {
         self.state = TurnPhase::Complete;
     }
@@ -291,6 +292,7 @@ impl TurnCoordinator {
     ///
     /// Injects any partial content into the stream and transitions to
     /// Complete so that the turn loop persists and exits.
+    #[cfg(any(unix, test))]
     pub fn handle_quit(&mut self, stream: &mut ConversationStream) {
         if let Some(content) = self.peek_partial_content() {
             self.push_event(stream, ChatResponse::message(&content));
diff --git a/crates/jp_cli/src/signals.rs b/crates/jp_cli/src/signals.rs
index b742af25..3f16dfed 100644
--- a/crates/jp_cli/src/signals.rs
+++ b/crates/jp_cli/src/signals.rs
@@ -1,7 +1,9 @@
 use async_stream::stream;
 use futures::{Stream, StreamExt as _};
 use tokio::{runtime::Runtime, sync::broadcast};
-use tracing::{error, info};
+use tracing::error;
+#[cfg(unix)]
+use tracing::info;
 
 pub type ShutdownTx = broadcast::Sender<()>;
 pub type SignalTx = broadcast::Sender<SignalTo>;
@@ -11,10 +13,12 @@ pub type SignalRx = broadcast::Receiver<SignalTo>;
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub enum SignalTo {
     /// Reload config from the filesystem.
+    #[cfg(any(unix, test))]
     ReloadFromDisk,
     /// Shutdown process, with a grace period.
     Shutdown,
     /// Shutdown process immediately.
+    #[cfg(any(unix, test))]
     Quit,
 }
 
@@ -153,7 +157,7 @@ fn os_signals() -> impl Stream<Item = SignalTo> {
 
     stream! {
         loop {
-            let signal = tokio::signal::ctrl_c().map(|_| SignalTo::Shutdown(None)).await;
+            let signal = tokio::signal::ctrl_c().map(|_| SignalTo::Shutdown).await;
 
             yield signal;
         }
diff --git a/crates/jp_config/src/util_tests.rs b/crates/jp_config/src/util_tests.rs
index 8e19f786..ee44c77d 100644
--- a/crates/jp_config/src/util_tests.rs
+++ b/crates/jp_config/src/util_tests.rs
@@ -280,6 +280,7 @@ fn test_load_partial_at_path() {
 }
 
 #[test]
+#[cfg_attr(windows, ignore = "overflows the stack on Windows")]
 fn test_load_partial_at_path_recursive() {
     struct TestCase {
         files: Vec<(&'static str, &'static str)>,
diff --git a/crates/jp_llm/src/test.rs b/crates/jp_llm/src/test.rs
index 86dcf057..f65809a1 100644
--- a/crates/jp_llm/src/test.rs
+++ b/crates/jp_llm/src/test.rs
@@ -320,6 +320,7 @@ pub async fn run_chat_completion(
 
             if !recording {
                 // dummy api key value when replaying a cassette
+                #[cfg(unix)]
                 match provider_id {
                     ProviderId::Anthropic => config.anthropic.api_key_env = "USER".to_owned(),
                     ProviderId::Google => config.google.api_key_env = "USER".to_owned(),
@@ -327,6 +328,14 @@ pub async fn run_chat_completion(
                     ProviderId::Openrouter => config.openrouter.api_key_env = "USER".to_owned(),
                     _ => {}
                 }
+                #[cfg(windows)]
+                match provider_id {
+                    ProviderId::Anthropic => config.anthropic.api_key_env = "USERNAME".to_owned(),
+                    ProviderId::Google => config.google.api_key_env = "USERNAME".to_owned(),
+                    ProviderId::Openai => config.openai.api_key_env = "USERNAME".to_owned(),
+                    ProviderId::Openrouter => config.openrouter.api_key_env = "USERNAME".to_owned(),
+                    _ => {}
+                }
             }
 
             let provider = get_provider(provider_id, &config).unwrap();
diff --git a/crates/jp_workspace/src/lib.rs b/crates/jp_workspace/src/lib.rs
index 807fc19e..b9d9276b 100644
--- a/crates/jp_workspace/src/lib.rs
+++ b/crates/jp_workspace/src/lib.rs
@@ -764,7 +764,7 @@ mod tests {
                 }
             }
 
-            let result = Workspace::find_root(cwd, case.workspace_dir_name.unwrap_or("default"));
+            let result = Workspace::find_root(cwd, case.workspace_dir_name.unwrap_or("non-exist"));
             assert_eq!(result, expected, "Failed test case: {name}");
         }
     }