diff --git a/crates/agent_ui/src/agent_ui.rs b/crates/agent_ui/src/agent_ui.rs
index 29a4f38487b34e134218b72e824b1d3aba439cb9..0ba3d07f99622c6bf1f0263d7181b8da80659b53 100644
--- a/crates/agent_ui/src/agent_ui.rs
+++ b/crates/agent_ui/src/agent_ui.rs
@@ -92,6 +92,7 @@ actions!(
 
 #[derive(Default, Clone, PartialEq, Deserialize, JsonSchema, Action)]
 #[action(namespace = agent)]
+#[serde(deny_unknown_fields)]
 pub struct NewThread {
     #[serde(default)]
     from_thread_id: Option<ThreadId>,
@@ -99,6 +100,7 @@ pub struct NewThread {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = agent)]
+#[serde(deny_unknown_fields)]
 pub struct ManageProfiles {
     #[serde(default)]
     pub customize_tools: Option<AgentProfileId>,
diff --git a/crates/git/src/git.rs b/crates/git/src/git.rs
index bb8f39f127f7bb3edae553844daf1635fb6b312d..d64d35b789415b2dda821693ee7e9d19193a5de4 100644
--- a/crates/git/src/git.rs
+++ b/crates/git/src/git.rs
@@ -65,6 +65,7 @@ actions!(
 
 #[derive(Clone, Debug, Default, PartialEq, Deserialize, JsonSchema, Action)]
 #[action(namespace = git, deprecated_aliases = ["editor::RevertFile"])]
+#[serde(deny_unknown_fields)]
 pub struct RestoreFile {
     #[serde(default)]
     pub skip_prompt: bool,
diff --git a/crates/gpui/tests/action_macros.rs b/crates/gpui/tests/action_macros.rs
index f601639fc8dbc05afaeed997a0c0b17c5dfa5ea7..7bff3a97b1c3d22e6c0e9841a26f2adf5d7f3a70 100644
--- a/crates/gpui/tests/action_macros.rs
+++ b/crates/gpui/tests/action_macros.rs
@@ -16,9 +16,11 @@ fn test_action_macros() {
 
     #[derive(PartialEq, Clone, Deserialize, JsonSchema, Action)]
     #[action(namespace = test_only)]
-    struct AnotherSomeAction;
+    #[serde(deny_unknown_fields)]
+    struct AnotherAction;
 
     #[derive(PartialEq, Clone, gpui::private::serde_derive::Deserialize)]
+    #[serde(deny_unknown_fields)]
     struct RegisterableAction {}
 
     register_action!(RegisterableAction);
diff --git a/crates/settings_ui/src/settings_ui.rs b/crates/settings_ui/src/settings_ui.rs
index b3fb10c5e6848c80c55117dadc750db7b70a58ea..28ffb1ab4a3ce6b300c16df545daeacba66887a0 100644
--- a/crates/settings_ui/src/settings_ui.rs
+++ b/crates/settings_ui/src/settings_ui.rs
@@ -31,6 +31,7 @@ impl FeatureFlag for SettingsUiFeatureFlag {
 
 #[derive(Copy, Clone, Debug, Default, PartialEq, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct ImportVsCodeSettings {
     #[serde(default)]
     pub skip_prompt: bool,
@@ -38,6 +39,7 @@ pub struct ImportVsCodeSettings {
 
 #[derive(Copy, Clone, Debug, Default, PartialEq, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct ImportCursorSettings {
     #[serde(default)]
     pub skip_prompt: bool,
diff --git a/crates/workspace/src/workspace.rs b/crates/workspace/src/workspace.rs
index 38532292435fdfa5948835cdf0d332c70bec3aa8..7c5355bfd1be10609ff8bcab9e7cd9cd3e7f7bc6 100644
--- a/crates/workspace/src/workspace.rs
+++ b/crates/workspace/src/workspace.rs
@@ -288,6 +288,7 @@ actions!(
 
 #[derive(Default, PartialEq, Eq, Clone, Deserialize, JsonSchema, Action)]
 #[action(namespace = file_finder, name = "Toggle")]
+#[serde(deny_unknown_fields)]
 pub struct ToggleFileFinder {
     #[serde(default)]
     pub separate_history: bool,
diff --git a/crates/zed_actions/src/lib.rs b/crates/zed_actions/src/lib.rs
index b8c52e27e83ffbdc152e94ea514f30b4c5df8223..fa852084d60b1e4eff913b6560a86bd0bf701cbd 100644
--- a/crates/zed_actions/src/lib.rs
+++ b/crates/zed_actions/src/lib.rs
@@ -58,6 +58,7 @@ pub enum ExtensionCategoryFilter {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct Extensions {
     /// Filters the extensions page down to extensions that are in the specified category.
     #[serde(default)]
@@ -66,6 +67,7 @@ pub struct Extensions {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct DecreaseBufferFontSize {
     #[serde(default)]
     pub persist: bool,
@@ -73,6 +75,7 @@ pub struct DecreaseBufferFontSize {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct IncreaseBufferFontSize {
     #[serde(default)]
     pub persist: bool,
@@ -80,6 +83,7 @@ pub struct IncreaseBufferFontSize {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct ResetBufferFontSize {
     #[serde(default)]
     pub persist: bool,
@@ -87,6 +91,7 @@ pub struct ResetBufferFontSize {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct DecreaseUiFontSize {
     #[serde(default)]
     pub persist: bool,
@@ -94,6 +99,7 @@ pub struct DecreaseUiFontSize {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct IncreaseUiFontSize {
     #[serde(default)]
     pub persist: bool,
@@ -101,6 +107,7 @@ pub struct IncreaseUiFontSize {
 
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
 pub struct ResetUiFontSize {
     #[serde(default)]
     pub persist: bool,