feat: system prompt and persona

src-tauri/src/commands/chat.rs

@@ -1,5 +1,6 @@
 use crate::commands::{fs, search, shell};
 use crate::llm::ollama::OllamaProvider;
+use crate::llm::prompts::SYSTEM_PROMPT;
 use crate::llm::types::{
     Message, ModelProvider, Role, ToolCall, ToolDefinition, ToolFunctionDefinition,
 };
@@ -51,6 +52,18 @@ pub async fn chat(
 
     // 3. Agent Loop
     let mut current_history = messages.clone();
+
+    // Inject System Prompt
+    current_history.insert(
+        0,
+        Message {
+            role: Role::System,
+            content: SYSTEM_PROMPT.to_string(),
+            tool_calls: None,
+            tool_call_id: None,
+        },
+    );
+
     let mut new_messages: Vec<Message> = Vec::new();
     let mut turn_count = 0;
 
@@ -78,7 +91,8 @@ pub async fn chat(
 
             current_history.push(assistant_msg.clone());
             new_messages.push(assistant_msg);
-            app.emit("chat:update", &current_history)
+            // Emit history excluding system prompt (index 0)
+            app.emit("chat:update", &current_history[1..])
                 .map_err(|e| e.to_string())?;
 
             // Execute Tools
@@ -96,7 +110,8 @@ pub async fn chat(
 
                 current_history.push(tool_msg.clone());
                 new_messages.push(tool_msg);
-                app.emit("chat:update", &current_history)
+                // Emit history excluding system prompt (index 0)
+                app.emit("chat:update", &current_history[1..])
                     .map_err(|e| e.to_string())?;
             }
         } else {
@@ -111,7 +126,8 @@ pub async fn chat(
             // We don't push to current_history needed for next loop, because we are done.
             new_messages.push(assistant_msg.clone());
             current_history.push(assistant_msg);
-            app.emit("chat:update", &current_history)
+            // Emit history excluding system prompt (index 0)
+            app.emit("chat:update", &current_history[1..])
                 .map_err(|e| e.to_string())?;
             break;
         }

src-tauri/src/llm/mod.rs

@@ -1,2 +1,3 @@
 pub mod ollama;
+pub mod prompts;
 pub mod types;

src-tauri/src/llm/prompts.rs

@@ -0,0 +1,17 @@
+pub const SYSTEM_PROMPT: &str = r#"You are an expert Senior Software Engineer and AI Agent running directly in the user's local development environment.
+
+Your Capabilities:
+1.  **Filesystem Access:** You can read, write, and list files in the current project using the provided tools.
+2.  **Shell Execution:** You can run commands like `git`, `cargo`, `npm`, `ls`, etc.
+3.  **Search:** You can search the codebase for patterns.
+
+Your Operational Rules:
+1.  **Process Awareness:** You MUST read `.living_spec/README.md` to understand the development process (Story-Driven Spec Workflow).
+2.  **Read Before Write:** ALWAYS read the relevant files before you propose or apply changes. Do not guess the file content.
+3.  **Overwrite Warning:** The `write_file` tool OVERWRITES the entire file. When you edit a file, you must output the COMPLETED full content of the file, including all imports and unchanged parts. Do not output partial diffs or placeholders like `// ... rest of code`.
+4.  **Conciseness:** Be direct. Do not waffle. If you need to run a tool, just run it. You don't need to say "I will now run...".
+5.  **Verification:** After writing code, it is good practice to run a quick check (e.g., `cargo check` or `npm test`) if applicable to verify your changes.
+
+Your Goal:
+Complete the user's request accurately and safely. If the request is ambiguous, ask for clarification.
+"#;