feat: remove tools from chat mode (#1533)

crates/goose/src/agents/capabilities.rs

@@ -11,6 +11,7 @@ use tokio::sync::Mutex;
 use tracing::{debug, instrument};
 
 use super::extension::{ExtensionConfig, ExtensionError, ExtensionInfo, ExtensionResult};
+use crate::config::Config;
 use crate::prompt_template;
 use crate::providers::base::{Provider, ProviderUsage};
 use mcp_client::client::{ClientCapabilities, ClientInfo, McpClient, McpClientTrait};
@@ -325,19 +326,23 @@ impl Capabilities {
     pub async fn get_system_prompt(&self) -> String {
         let mut context: HashMap<&str, Value> = HashMap::new();
 
-        let extensions_info: Vec<ExtensionInfo> = self
-            .clients
-            .keys()
-            .map(|name| {
-                let instructions = self.instructions.get(name).cloned().unwrap_or_default();
-                let has_resources = self.resource_capable_extensions.contains(name);
-                ExtensionInfo::new(name, &instructions, has_resources)
-            })
-            .collect();
+        let config = Config::global();
+        let goose_mode = config.get("GOOSE_MODE").unwrap_or("auto".to_string());
+        // In chat mode, we don't need to have the extensions to confuse LLM and it can help save cost as well.
+        if goose_mode != "chat" {
+            let extensions_info: Vec<ExtensionInfo> = self
+                .clients
+                .keys()
+                .map(|name| {
+                    let instructions = self.instructions.get(name).cloned().unwrap_or_default();
+                    let has_resources = self.resource_capable_extensions.contains(name);
+                    ExtensionInfo::new(name, &instructions, has_resources)
+                })
+                .collect();
+            context.insert("extensions", serde_json::to_value(extensions_info).unwrap());
+        }
 
         let current_date_time = Utc::now().format("%Y-%m-%d %H:%M:%S").to_string();
-
-        context.insert("extensions", serde_json::to_value(extensions_info).unwrap());
         context.insert("current_date_time", Value::String(current_date_time));
 
         // Conditionally load the override prompt or the global system prompt

crates/goose/src/agents/truncate.rs

@@ -206,6 +206,14 @@ impl Agent for TruncateAgent {
             tools.push(list_resources_tool);
         }
 
+        if goose_mode == "chat" {
+            tools.clear();
+            capabilities.add_system_prompt_extension(
+                "Right now you are in the chat only mode, no access to any tool use and system."
+                    .to_string(),
+            );
+        }
+
         let system_prompt = capabilities.get_system_prompt().await;
 
         // Set the user_message field in the span instead of creating a new event
@@ -315,21 +323,7 @@ impl Agent for TruncateAgent {
                             },
                             "chat" => {
                                 // Skip all tool calls in chat mode
-                                for request in &tool_requests {
-                                    message_tool_response = message_tool_response.with_tool_response(
-                                        request.id.clone(),
-                                        Ok(vec![Content::text(
-                                            "Let the user know the tool call was skipped in Goose chat mode. \
-                                            DO NOT apologize for skipping the tool call. DO NOT say sorry. \
-                                            Provide an explanation of what the tool call would do, structured as a \
-                                            plan for the user. Again, DO NOT apologize. \
-                                            **Example Plan:**\n \
-                                            1. **Identify Task Scope** - Determine the purpose and expected outcome.\n \
-                                            2. **Outline Steps** - Break down the steps.\n \
-                                            If needed, adjust the explanation based on user preferences or questions."
-                                        )]),
-                                    );
-                                }
+                                break;
                             },
                             _ => {
                                 if mode != "auto" {