Move hardcoded LLM prompts to template files (#3934)

Co-authored-by: Douwe Osinga <douwe@squareup.com>
Co-authored-by: Claude <noreply@anthropic.com>

crates/goose/src/agents/router_tool_selector.rs

@@ -4,6 +4,7 @@ use rmcp::model::Tool;
 
 use anyhow::{Context, Result};
 use async_trait::async_trait;
+use serde::Serialize;
 use serde_json::Value;
 use std::collections::HashMap;
 use std::collections::VecDeque;
@@ -14,8 +15,15 @@ use tokio::sync::RwLock;
 use crate::agents::tool_vectordb::ToolVectorDB;
 use crate::conversation::message::Message;
 use crate::model::ModelConfig;
+use crate::prompt_template::render_global_file;
 use crate::providers::{self, base::Provider};
 
+#[derive(Serialize)]
+struct ToolSelectorContext {
+    tools: String,
+    query: String,
+}
+
 #[derive(Debug, Clone, PartialEq)]
 pub enum RouterToolSelectionStrategy {
     Vector,
@@ -282,15 +290,21 @@ impl RouterToolSelector for LLMToolSelector {
         };
 
         if let Some(tools) = relevant_tools {
-            // Use LLM to search through tools
-            let prompt = format!(
-                "Given the following tools:\n{}\n\nFind the most relevant tools for the query: {}\n\nReturn the tools in this exact format for each tool:\nTool: <tool_name>\nDescription: <tool_description>\nSchema: <tool_schema>",
-                tools, query
-            );
-            let system_message = Message::user().with_text("You are a tool selection assistant. Your task is to find the most relevant tools based on the user's query.");
+            // Use template to generate the prompt
+            let context = ToolSelectorContext {
+                tools: tools.clone(),
+                query: query.to_string(),
+            };
+
+            let user_prompt =
+                render_global_file("router_tool_selector.md", &context).map_err(|e| {
+                    ToolError::ExecutionError(format!("Failed to render prompt template: {}", e))
+                })?;
+
+            let user_message = Message::user().with_text(&user_prompt);
             let response = self
                 .llm_provider
-                .complete(&prompt, &[system_message], &[])
+                .complete("", &[user_message], &[])
                 .await
                 .map_err(|e| ToolError::ExecutionError(format!("Failed to search tools: {}", e)))?;
 

crates/goose/src/permission/permission_judge.rs

@@ -3,6 +3,7 @@ use crate::config::permission::PermissionLevel;
 use crate::config::PermissionManager;
 use crate::conversation::message::{Message, MessageContent, ToolRequest};
 use crate::conversation::Conversation;
+use crate::prompt_template::render_global_file;
 use crate::providers::base::Provider;
 use chrono::Utc;
 use indoc::indoc;
@@ -13,6 +14,11 @@ use serde_json::Value;
 use std::collections::HashSet;
 use std::sync::Arc;
 
+#[derive(Serialize)]
+struct PermissionJudgeContext {
+    // Empty struct for now since the current template doesn't need variables
+}
+
 /// Creates the tool definition for checking read-only permissions.
 fn create_read_only_tool() -> Tool {
     Tool::new(
@@ -133,12 +139,12 @@ pub async fn detect_read_only_tools(
     let tool = create_read_only_tool();
     let check_messages = create_check_messages(tool_requests);
 
+    let context = PermissionJudgeContext {};
+    let system_prompt = render_global_file("permission_judge.md", &context)
+        .unwrap_or_else(|_| "You are a good analyst and can detect operations whether they have read-only operations.".to_string());
+
     let res = provider
-        .complete(
-            "You are a good analyst and can detect operations whether they have read-only operations.",
-            check_messages.messages(),
-            &[tool.clone()],
-        )
+        .complete(&system_prompt, check_messages.messages(), &[tool.clone()])
         .await;
 
     // Process the response and return an empty vector if the response is invalid

crates/goose/src/prompts/permission_judge.md

@@ -0,0 +1 @@
+You are a good analyst and can detect operations whether they have read-only operations.

crates/goose/src/prompts/router_tool_selector.md

@@ -0,0 +1,11 @@
+You are a tool selection assistant. Your task is to find the most relevant tools based on the user's query.
+
+Given the following tools:
+{{ tools }}
+
+Find the most relevant tools for the query: {{ query }}
+
+Return the tools in this exact format for each tool:
+Tool: <tool_name>
+Description: <tool_description>
+Schema: <tool_schema>