Files
awesome-copilot/cookbook/copilot-sdk/go/recipe/ralph-loop.go
Anthony Shaw 717c0121bc PR feedback
2026-02-11 15:16:44 -08:00

112 lines
3.0 KiB
Go

package main
import (
"context"
"fmt"
"log"
"os"
"strconv"
"strings"
copilot "github.com/github/copilot-sdk/go"
)
// Ralph loop: autonomous AI task loop with fresh context per iteration.
//
// Two modes:
// - "plan": reads PROMPT_plan.md, generates/updates IMPLEMENTATION_PLAN.md
// - "build": reads PROMPT_build.md, implements tasks, runs tests, commits
//
// Each iteration creates a fresh session so the agent always operates in
// the "smart zone" of its context window. State is shared between
// iterations via files on disk (IMPLEMENTATION_PLAN.md, AGENTS.md, specs/*).
//
// Usage:
// go run ralph-loop.go # build mode, 50 iterations
// go run ralph-loop.go plan # planning mode
// go run ralph-loop.go 20 # build mode, 20 iterations
// go run ralph-loop.go plan 5 # planning mode, 5 iterations
func ralphLoop(ctx context.Context, mode string, maxIterations int) error {
promptFile := "PROMPT_build.md"
if mode == "plan" {
promptFile = "PROMPT_plan.md"
}
client := copilot.NewClient(nil)
if err := client.Start(ctx); err != nil {
return fmt.Errorf("failed to start client: %w", err)
}
defer client.Stop()
cwd, err := os.Getwd()
if err != nil {
return fmt.Errorf("failed to get working directory: %w", err)
}
fmt.Println(strings.Repeat("━", 40))
fmt.Printf("Mode: %s\n", mode)
fmt.Printf("Prompt: %s\n", promptFile)
fmt.Printf("Max: %d iterations\n", maxIterations)
fmt.Println(strings.Repeat("━", 40))
prompt, err := os.ReadFile(promptFile)
if err != nil {
return fmt.Errorf("failed to read %s: %w", promptFile, err)
}
for i := 1; i <= maxIterations; i++ {
fmt.Printf("\n=== Iteration %d/%d ===\n", i, maxIterations)
session, err := client.CreateSession(ctx, &copilot.SessionConfig{
Model: "gpt-5.1-codex-mini",
WorkingDirectory: cwd,
OnPermissionRequest: func(_ copilot.PermissionRequest, _ map[string]string) copilot.PermissionRequestResult {
return copilot.PermissionRequestResult{Kind: "approved"}
},
})
if err != nil {
return fmt.Errorf("failed to create session: %w", err)
}
// Log tool usage for visibility
session.On(func(event copilot.Event) {
if toolExecution, ok := event.(copilot.ToolExecutionStartEvent); ok {
fmt.Printf(" ⚙ %s\n", toolExecution.Data.ToolName)
}
})
_, err = session.SendAndWait(ctx, copilot.MessageOptions{
Prompt: string(prompt),
})
if destroyErr := session.Destroy(); destroyErr != nil {
log.Printf("failed to destroy session on iteration %d: %v", i, destroyErr)
}
if err != nil {
return fmt.Errorf("send failed on iteration %d: %w", i, err)
}
fmt.Printf("\nIteration %d complete.\n", i)
}
fmt.Printf("\nReached max iterations: %d\n", maxIterations)
return nil
}
func main() {
mode := "build"
maxIterations := 50
for _, arg := range os.Args[1:] {
if arg == "plan" {
mode = "plan"
} else if n, err := strconv.Atoi(arg); err == nil {
maxIterations = n
}
}
if err := ralphLoop(context.Background(), mode, maxIterations); err != nil {
log.Fatal(err)
}
}