diff --git a/rust/crates/api/src/client.rs b/rust/crates/api/src/client.rs
index 8a9c286..b596777 100644
--- a/rust/crates/api/src/client.rs
+++ b/rust/crates/api/src/client.rs
@@ -1,5 +1,5 @@
 use crate::error::ApiError;
-use crate::providers::claw_provider::{self, ClawApiClient, AuthSource};
+use crate::providers::claw_provider::{self, AuthSource, ClawApiClient};
 use crate::providers::openai_compat::{self, OpenAiCompatClient, OpenAiCompatConfig};
 use crate::providers::{self, Provider, ProviderKind};
 use crate::types::{MessageRequest, MessageResponse, StreamEvent};
diff --git a/rust/crates/api/src/lib.rs b/rust/crates/api/src/lib.rs
index 2b2584a..3306f53 100644
--- a/rust/crates/api/src/lib.rs
+++ b/rust/crates/api/src/lib.rs
@@ -9,7 +9,7 @@ pub use client::{
     resolve_startup_auth_source, MessageStream, OAuthTokenSet, ProviderClient,
 };
 pub use error::ApiError;
-pub use providers::claw_provider::{ClawApiClient, ClawApiClient as ApiClient, AuthSource};
+pub use providers::claw_provider::{AuthSource, ClawApiClient, ClawApiClient as ApiClient};
 pub use providers::openai_compat::{OpenAiCompatClient, OpenAiCompatConfig};
 pub use providers::{
     detect_provider_kind, max_tokens_for_model, resolve_model_alias, ProviderKind,
diff --git a/rust/crates/api/src/providers/claw_provider.rs b/rust/crates/api/src/providers/claw_provider.rs
index 55d7f37..d9046cd 100644
--- a/rust/crates/api/src/providers/claw_provider.rs
+++ b/rust/crates/api/src/providers/claw_provider.rs
@@ -652,7 +652,7 @@ mod tests {
 
     use super::{
         now_unix_timestamp, oauth_token_is_expired, resolve_saved_oauth_token,
-        resolve_startup_auth_source, ClawApiClient, AuthSource, OAuthTokenSet,
+        resolve_startup_auth_source, AuthSource, ClawApiClient, OAuthTokenSet,
     };
     use crate::types::{ContentBlockDelta, MessageRequest};
 
diff --git a/rust/crates/api/tests/client_integration.rs b/rust/crates/api/tests/client_integration.rs
index ae810b8..3b6a3c3 100644
--- a/rust/crates/api/tests/client_integration.rs
+++ b/rust/crates/api/tests/client_integration.rs
@@ -290,8 +290,7 @@ async fn live_stream_smoke_test() {
     let client = ApiClient::from_env().expect("ANTHROPIC_API_KEY must be set");
     let mut stream = client
         .stream_message(&MessageRequest {
-            model: std::env::var("CLAW_MODEL")
-                .unwrap_or_else(|_| "claude-sonnet-4-6".to_string()),
+            model: std::env::var("CLAW_MODEL").unwrap_or_else(|_| "claude-sonnet-4-6".to_string()),
             max_tokens: 32,
             messages: vec![InputMessage::user_text(
                 "Reply with exactly: hello from rust",
diff --git a/rust/crates/claw-cli/src/init.rs b/rust/crates/claw-cli/src/init.rs
index 69095cd..f4db53a 100644
--- a/rust/crates/claw-cli/src/init.rs
+++ b/rust/crates/claw-cli/src/init.rs
@@ -386,8 +386,7 @@ mod tests {
         let root = temp_dir();
         fs::create_dir_all(&root).expect("create root");
         fs::write(root.join("CLAW.md"), "custom guidance\n").expect("write existing claw md");
-        fs::write(root.join(".gitignore"), ".claw/settings.local.json\n")
-            .expect("write gitignore");
+        fs::write(root.join(".gitignore"), ".claw/settings.local.json\n").expect("write gitignore");
 
         let first = initialize_repo(&root).expect("first init should succeed");
         assert!(first
diff --git a/rust/crates/claw-cli/src/main.rs b/rust/crates/claw-cli/src/main.rs
index 0abaad5..d0b90f7 100644
--- a/rust/crates/claw-cli/src/main.rs
+++ b/rust/crates/claw-cli/src/main.rs
@@ -16,7 +16,7 @@ use std::thread;
 use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
 
 use api::{
-    resolve_startup_auth_source, ClawApiClient, AuthSource, ContentBlockDelta, InputContentBlock,
+    resolve_startup_auth_source, AuthSource, ClawApiClient, ContentBlockDelta, InputContentBlock,
     InputMessage, MessageRequest, MessageResponse, OutputContentBlock,
     StreamEvent as ApiStreamEvent, ToolChoice, ToolDefinition, ToolResultContentBlock,
 };
@@ -2037,8 +2037,7 @@ fn render_memory_report() -> Result<String, Box<dyn std::error::Error>> {
     if project_context.instruction_files.is_empty() {
         lines.push("Discovered files".to_string());
         lines.push(
-            "  No CLAW instruction files discovered in the current directory ancestry."
-                .to_string(),
+            "  No CLAW instruction files discovered in the current directory ancestry.".to_string(),
         );
     } else {
         lines.push("Discovered files".to_string());
@@ -2790,7 +2789,8 @@ fn build_runtime(
     allowed_tools: Option<AllowedToolSet>,
     permission_mode: PermissionMode,
     progress_reporter: Option<InternalPromptProgressReporter>,
-) -> Result<ConversationRuntime<DefaultRuntimeClient, CliToolExecutor>, Box<dyn std::error::Error>> {
+) -> Result<ConversationRuntime<DefaultRuntimeClient, CliToolExecutor>, Box<dyn std::error::Error>>
+{
     let (feature_config, tool_registry) = build_runtime_plugin_state()?;
     Ok(ConversationRuntime::new_with_features(
         session,
diff --git a/rust/crates/runtime/src/lib.rs b/rust/crates/runtime/src/lib.rs
index 9dcb239..a610f04 100644
--- a/rust/crates/runtime/src/lib.rs
+++ b/rust/crates/runtime/src/lib.rs
@@ -24,8 +24,8 @@ pub use compact::{
     get_compact_continuation_message, should_compact, CompactionConfig, CompactionResult,
 };
 pub use config::{
-    ConfigEntry, ConfigError, ConfigLoader, ConfigSource, McpManagedProxyServerConfig,
-    McpConfigCollection, McpOAuthConfig, McpRemoteServerConfig, McpSdkServerConfig,
+    ConfigEntry, ConfigError, ConfigLoader, ConfigSource, McpConfigCollection,
+    McpManagedProxyServerConfig, McpOAuthConfig, McpRemoteServerConfig, McpSdkServerConfig,
     McpServerConfig, McpStdioServerConfig, McpTransport, McpWebSocketServerConfig, OAuthConfig,
     ResolvedPermissionMode, RuntimeConfig, RuntimeFeatureConfig, RuntimeHookConfig,
     RuntimePluginConfig, ScopedMcpServerConfig, CLAW_SETTINGS_SCHEMA_NAME,
@@ -45,7 +45,7 @@ pub use mcp::{
     scoped_mcp_config_hash, unwrap_ccr_proxy_url,
 };
 pub use mcp_client::{
-    McpManagedProxyTransport, McpClientAuth, McpClientBootstrap, McpClientTransport,
+    McpClientAuth, McpClientBootstrap, McpClientTransport, McpManagedProxyTransport,
     McpRemoteTransport, McpSdkTransport, McpStdioTransport,
 };
 pub use mcp_stdio::{
diff --git a/rust/crates/runtime/src/mcp_client.rs b/rust/crates/runtime/src/mcp_client.rs
index 0e94391..e0e1f2c 100644
--- a/rust/crates/runtime/src/mcp_client.rs
+++ b/rust/crates/runtime/src/mcp_client.rs
@@ -97,12 +97,10 @@ impl McpClientTransport {
             McpServerConfig::Sdk(config) => Self::Sdk(McpSdkTransport {
                 name: config.name.clone(),
             }),
-            McpServerConfig::ManagedProxy(config) => {
-                Self::ManagedProxy(McpManagedProxyTransport {
-                    url: config.url.clone(),
-                    id: config.id.clone(),
-                })
-            }
+            McpServerConfig::ManagedProxy(config) => Self::ManagedProxy(McpManagedProxyTransport {
+                url: config.url.clone(),
+                id: config.id.clone(),
+            }),
         }
     }
 }
diff --git a/rust/crates/runtime/src/mcp_stdio.rs b/rust/crates/runtime/src/mcp_stdio.rs
index 9c8d346..27402d6 100644
--- a/rust/crates/runtime/src/mcp_stdio.rs
+++ b/rust/crates/runtime/src/mcp_stdio.rs
@@ -1163,8 +1163,12 @@ mod tests {
     }
 
     fn cleanup_script(script_path: &Path) {
-        fs::remove_file(script_path).expect("cleanup script");
-        fs::remove_dir_all(script_path.parent().expect("script parent")).expect("cleanup dir");
+        if let Err(error) = fs::remove_file(script_path) {
+            assert_eq!(error.kind(), std::io::ErrorKind::NotFound, "cleanup script");
+        }
+        if let Err(error) = fs::remove_dir_all(script_path.parent().expect("script parent")) {
+            assert_eq!(error.kind(), std::io::ErrorKind::NotFound, "cleanup dir");
+        }
     }
 
     fn manager_server_config(
diff --git a/rust/crates/runtime/src/session.rs b/rust/crates/runtime/src/session.rs
index beaa435..ec37070 100644
--- a/rust/crates/runtime/src/session.rs
+++ b/rust/crates/runtime/src/session.rs
@@ -3,10 +3,13 @@ use std::fmt::{Display, Formatter};
 use std::fs;
 use std::path::Path;
 
+use serde::{Deserialize, Serialize};
+
 use crate::json::{JsonError, JsonValue};
 use crate::usage::TokenUsage;
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(rename_all = "snake_case")]
 pub enum MessageRole {
     System,
     User,
@@ -14,7 +17,8 @@ pub enum MessageRole {
     Tool,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+#[serde(tag = "type", rename_all = "snake_case")]
 pub enum ContentBlock {
     Text {
         text: String,
@@ -32,14 +36,14 @@ pub enum ContentBlock {
     },
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 pub struct ConversationMessage {
     pub role: MessageRole,
     pub blocks: Vec<ContentBlock>,
     pub usage: Option<TokenUsage>,
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
 pub struct Session {
     pub version: u32,
     pub messages: Vec<ConversationMessage>,
diff --git a/rust/crates/runtime/src/usage.rs b/rust/crates/runtime/src/usage.rs
index 7e5bfcb..0570bc1 100644
--- a/rust/crates/runtime/src/usage.rs
+++ b/rust/crates/runtime/src/usage.rs
@@ -1,4 +1,5 @@
 use crate::session::Session;
+use serde::{Deserialize, Serialize};
 
 const DEFAULT_INPUT_COST_PER_MILLION: f64 = 15.0;
 const DEFAULT_OUTPUT_COST_PER_MILLION: f64 = 75.0;
@@ -25,7 +26,7 @@ impl ModelPricing {
     }
 }
 
-#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, Default, PartialEq, Eq)]
 pub struct TokenUsage {
     pub input_tokens: u32,
     pub output_tokens: u32,
diff --git a/rust/crates/tools/src/lib.rs b/rust/crates/tools/src/lib.rs
index b5fab79..9da2097 100644
--- a/rust/crates/tools/src/lib.rs
+++ b/rust/crates/tools/src/lib.rs
@@ -91,7 +91,10 @@ impl GlobalToolRegistry {
         Ok(Self { plugin_tools })
     }
 
-    pub fn normalize_allowed_tools(&self, values: &[String]) -> Result<Option<BTreeSet<String>>, String> {
+    pub fn normalize_allowed_tools(
+        &self,
+        values: &[String],
+    ) -> Result<Option<BTreeSet<String>>, String> {
         if values.is_empty() {
             return Ok(None);
         }
@@ -100,7 +103,11 @@ impl GlobalToolRegistry {
         let canonical_names = builtin_specs
             .iter()
             .map(|spec| spec.name.to_string())
-            .chain(self.plugin_tools.iter().map(|tool| tool.definition().name.clone()))
+            .chain(
+                self.plugin_tools
+                    .iter()
+                    .map(|tool| tool.definition().name.clone()),
+            )
             .collect::<Vec<_>>();
         let mut name_map = canonical_names
             .iter()
@@ -151,7 +158,8 @@ impl GlobalToolRegistry {
             .plugin_tools
             .iter()
             .filter(|tool| {
-                allowed_tools.is_none_or(|allowed| allowed.contains(tool.definition().name.as_str()))
+                allowed_tools
+                    .is_none_or(|allowed| allowed.contains(tool.definition().name.as_str()))
             })
             .map(|tool| ToolDefinition {
                 name: tool.definition().name.clone(),
@@ -174,7 +182,8 @@ impl GlobalToolRegistry {
             .plugin_tools
             .iter()
             .filter(|tool| {
-                allowed_tools.is_none_or(|allowed| allowed.contains(tool.definition().name.as_str()))
+                allowed_tools
+                    .is_none_or(|allowed| allowed.contains(tool.definition().name.as_str()))
             })
             .map(|tool| {
                 (