Add PR descriptor script for automated pull request descriptions📄✨ (#764

)

* Add PR descriptor script for generating pull request descriptions 📄✨

* Refactor script and format pull request description 📝

* Update PR generation script to include changes in the current branch 🚀

* Add task planning instruction to PR description script 📝

* Update prompts, cost rendering, and add brevity instruction 📝💰

packages/core/src/runpromptcontext.ts

@@ -387,7 +387,9 @@ export function createChatGenerationContext(
                     async (_) => {
                         if (typeof fn === "string") _.writeText(dedent(fn))
                         else await fn(_, args)
-                        _.$`- Assume that your answer will be analyzed by an LLM, not a human.
+                        _.$`Make a plan and solve this task.
+                        
+                - Assume that your answer will be analyzed by an LLM, not a human.
                 - If you are missing information, reply "MISSING_INFO: <what is missing>".
                 - If you cannot answer the query, return "NO_ANSWER: <reason>".
                 - Be concise. Minimize output to the most relevant information to save context tokens.`

packages/core/src/usage.ts

@@ -45,11 +45,12 @@ export function estimateCost(modelId: string, usage: ChatCompletionUsage) {
 }
 
 export function renderCost(value: number) {
-    return value !== undefined
-        ? value <= 0.1
-            ? `${(value * 100).toFixed(2)}¢`
-            : `${value.toFixed(2)}$`
-        : ""
+    if (isNaN(value)) return ""
+    return value <= 0.01
+        ? `${(value * 100).toFixed(3)}¢`
+        : value <= 0.1
+          ? `${(value * 100).toFixed(2)}¢`
+          : `${value.toFixed(2)}$`
 }
 
 export class GenerationStats {

packages/sample/genaisrc/prd-min.genai.mts

@@ -0,0 +1,4 @@
+script({ tools: ["agent_fs", "agent_git"] })
+
+$`Generate a pull request description for the changes in the current branch. 
+Make a plan and solve this task. Keep it short.`