feat: replace prompt for ollama smaller models (#1021)

crates/goose/src/providers/ollama.rs

@@ -6,6 +6,7 @@ use crate::model::ModelConfig;
 use crate::providers::formats::openai::{create_request, get_usage, response_to_message};
 use anyhow::Result;
 use async_trait::async_trait;
+use indoc::formatdoc;
 use mcp_core::tool::Tool;
 use reqwest::Client;
 use serde_json::Value;
@@ -115,9 +116,78 @@ impl Provider for OllamaProvider {
         messages: &[Message],
         tools: &[Tool],
     ) -> Result<(Message, ProviderUsage), ProviderError> {
+        // Transform the system message to replace developer instructions
+        let modified_system = if let Some(dev_section) = system.split("## developer").nth(1) {
+            if let (Some(start_idx), Some(end_idx)) = (
+                dev_section.find("### Instructions"),
+                dev_section.find("operating system:"),
+            ) {
+                let new_instructions = formatdoc! {r#"
+        The Developer extension enables you to edit code files, execute shell commands, and capture screen/window content. These tools allow for various development and debugging workflows.
+        Available Tools:
+        1. Shell Execution (`shell`)
+        Executes commands in the shell and returns the combined output and error messages.
+        Use cases:
+        - Running scripts: `python script.py`
+        - Installing dependencies: `pip install -r requirements.txt`
+        - Checking system information: `uname -a`, `df -h`
+        - Searching for files or text: **Use `rg` (ripgrep) instead of `find` or `ls -r`**
+          - Find a file: `rg --files | rg example.py`
+          - Search within files: `rg 'class Example'`
+        Best Practices:
+        - **Avoid commands with large output** (pipe them to a file if necessary).
+        - **Run background processes** if they take a long time (e.g., `uvicorn main:app &`).
+        - **git commands can be run on the shell, however if the git extension is installed, you should use the git tool instead.
+        - **If the shell command is a rm, mv, or cp, you should verify with the user before running the command.
+        2. Text Editor (`text_editor`)
+        Performs file-based operations such as viewing, writing, replacing text, and undoing edits.
+        Commands:
+        - view: Read the content of a file.
+        - write: Create or overwrite a file. Caution: Overwrites the entire file!
+        - str_replace: Replace a specific string in a file.
+        - undo_edit: Revert the last edit.
+        Example Usage:
+        text_editor(command="view", file_path="/absolute/path/to/file.py")
+        text_editor(command="write", file_path="/absolute/path/to/file.py", file_text="print('hello world')")
+        text_editor(command="str_replace", file_path="/absolute/path/to/file.py", old_str="hello world", new_str="goodbye world")
+        text_editor(command="undo_edit", file_path="/absolute/path/to/file.py")
+        Protocol for Text Editor:
+        For edit and replace commands, please verify what you are editing with the user before running the command.
+        - User: "Please edit the file /absolute/path/to/file.py"
+        - Assistant: "Ok sounds good, I'll be editing the file /absolute/path/to/file.py and creating modifications xyz to the file. Let me know whether you'd like to proceed."
+        - User: "Yes, please proceed."
+        - Assistant: "I've created the modifications xyz to the file /absolute/path/to/file.py"
+        3. List Windows (`list_windows`)
+        Lists all visible windows with their titles.
+        Use this to find window titles for screen capture.
+        4. Screen Capture (`screen_capture`)
+        Takes a screenshot of a display or specific window.
+        Options:
+        - Capture display: `screen_capture(display=0)`  # Main display
+        - Capture window: `screen_capture(window_title="Window Title")`
+        Info: at the start of the session, the user's directory is:
+        "#};
+
+                let before_dev = system.split("## developer").next().unwrap_or("");
+                let after_marker = &dev_section[end_idx..];
+
+                format!(
+                    "{}## developer{}### Instructions\n{}{}",
+                    before_dev,
+                    &dev_section[..start_idx],
+                    new_instructions,
+                    after_marker
+                )
+            } else {
+                system.to_string()
+            }
+        } else {
+            system.to_string()
+        };
+
         let payload = create_request(
             &self.model,
-            system,
+            &modified_system,
             messages,
             tools,
             &super::utils::ImageFormat::OpenAi,