From f37ada61b853d80c97f510783d128beb7a72134b Mon Sep 17 00:00:00 2001 From: Christian Rocha Date: Mon, 20 Oct 2025 12:28:58 -0400 Subject: [PATCH] docs(examples): add moon phase example --- examples/go.mod | 77 +++++++++++++++++++++ examples/go.sum | 154 ++++++++++++++++++++++++++++++++++++++++++ examples/moon/main.go | 145 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 376 insertions(+) create mode 100644 examples/go.mod create mode 100644 examples/go.sum create mode 100644 examples/moon/main.go diff --git a/examples/go.mod b/examples/go.mod new file mode 100644 index 0000000000000000000000000000000000000000..4de267477d63ee66f8b214c05225196de6685f85 --- /dev/null +++ b/examples/go.mod @@ -0,0 +1,77 @@ +module charm.land/fantasy/examples + +go 1.25.2 + +replace charm.land/fantasy => ../ + +require ( + charm.land/fantasy v0.0.0-00010101000000-000000000000 + github.com/charmbracelet/lipgloss/v2 v2.0.0-beta.3.0.20250917201909-41ff0bf215ea + github.com/charmbracelet/log/v2 v2.0.0-20251001162505-358b5269b546 + github.com/charmbracelet/x/term v0.2.1 +) + +require ( + cloud.google.com/go/auth v0.17.0 // indirect + cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect + cloud.google.com/go/compute/metadata v0.8.0 // indirect + github.com/anthropics/anthropic-sdk-go v1.10.0 // indirect + github.com/aws/aws-sdk-go-v2 v1.39.3 // indirect + github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.3 // indirect + github.com/aws/aws-sdk-go-v2/config v1.27.27 // indirect + github.com/aws/aws-sdk-go-v2/credentials v1.17.27 // indirect + github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.11 // indirect + github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.15 // indirect + github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.15 // indirect + github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 // indirect + github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3 // indirect + github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.17 // indirect + github.com/aws/aws-sdk-go-v2/service/sso v1.22.4 // indirect + github.com/aws/aws-sdk-go-v2/service/ssooidc v1.26.4 // indirect + github.com/aws/aws-sdk-go-v2/service/sts v1.30.3 // indirect + github.com/aws/smithy-go v1.23.1 // indirect + github.com/charmbracelet/colorprofile v0.3.2 // indirect + github.com/charmbracelet/ultraviolet v0.0.0-20250915111650-81d4262876ef // indirect + github.com/charmbracelet/x/ansi v0.10.2 // indirect + github.com/charmbracelet/x/cellbuf v0.0.14-0.20250811133356-e0c5dbe5ea4a // indirect + github.com/charmbracelet/x/json v0.2.0 // indirect + github.com/charmbracelet/x/termios v0.1.1 // indirect + github.com/charmbracelet/x/windows v0.2.2 // indirect + github.com/felixge/httpsnoop v1.0.4 // indirect + github.com/go-logfmt/logfmt v0.6.0 // indirect + github.com/go-logr/logr v1.4.3 // indirect + github.com/go-logr/stdr v1.2.2 // indirect + github.com/go-viper/mapstructure/v2 v2.4.0 // indirect + github.com/google/s2a-go v0.1.9 // indirect + github.com/google/uuid v1.6.0 // indirect + github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect + github.com/googleapis/gax-go/v2 v2.15.0 // indirect + github.com/lucasb-eyer/go-colorful v1.3.0 // indirect + github.com/mattn/go-runewidth v0.0.17 // indirect + github.com/muesli/cancelreader v0.2.2 // indirect + github.com/openai/openai-go/v2 v2.7.1 // indirect + github.com/rivo/uniseg v0.4.7 // indirect + github.com/tidwall/gjson v1.18.0 // indirect + github.com/tidwall/match v1.1.1 // indirect + github.com/tidwall/pretty v1.2.1 // indirect + github.com/tidwall/sjson v1.2.5 // indirect + github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect + go.opentelemetry.io/auto/sdk v1.1.0 // indirect + go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.61.0 // indirect + go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 // indirect + go.opentelemetry.io/otel v1.36.0 // indirect + go.opentelemetry.io/otel/metric v1.36.0 // indirect + go.opentelemetry.io/otel/trace v1.36.0 // indirect + golang.org/x/crypto v0.41.0 // indirect + golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect + golang.org/x/net v0.43.0 // indirect + golang.org/x/oauth2 v0.32.0 // indirect + golang.org/x/sync v0.17.0 // indirect + golang.org/x/sys v0.36.0 // indirect + golang.org/x/text v0.28.0 // indirect + golang.org/x/time v0.12.0 // indirect + google.golang.org/api v0.239.0 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20250603155806-513f23925822 // indirect + google.golang.org/grpc v1.74.2 // indirect + google.golang.org/protobuf v1.36.7 // indirect +) diff --git a/examples/go.sum b/examples/go.sum new file mode 100644 index 0000000000000000000000000000000000000000..fe6a7498904a96d7d81d13a850cfd9808b225420 --- /dev/null +++ b/examples/go.sum @@ -0,0 +1,154 @@ +cloud.google.com/go/auth v0.17.0 h1:74yCm7hCj2rUyyAocqnFzsAYXgJhrG26XCFimrc/Kz4= +cloud.google.com/go/auth v0.17.0/go.mod h1:6wv/t5/6rOPAX4fJiRjKkJCvswLwdet7G8+UGXt7nCQ= +cloud.google.com/go/auth/oauth2adapt v0.2.8 h1:keo8NaayQZ6wimpNSmW5OPc283g65QNIiLpZnkHRbnc= +cloud.google.com/go/auth/oauth2adapt v0.2.8/go.mod h1:XQ9y31RkqZCcwJWNSx2Xvric3RrU88hAYYbjDWYDL+c= +cloud.google.com/go/compute/metadata v0.8.0 h1:HxMRIbao8w17ZX6wBnjhcDkW6lTFpgcaobyVfZWqRLA= +cloud.google.com/go/compute/metadata v0.8.0/go.mod h1:sYOGTp851OV9bOFJ9CH7elVvyzopvWQFNNghtDQ/Biw= +github.com/anthropics/anthropic-sdk-go v1.10.0 h1:jDKQTfC0miIEj21eMmPrNSLKTNdNa3nHZOhd4wZz1cI= +github.com/anthropics/anthropic-sdk-go v1.10.0/go.mod h1:WTz31rIUHUHqai2UslPpw5CwXrQP3geYBioRV4WOLvE= +github.com/aws/aws-sdk-go-v2 v1.39.3 h1:h7xSsanJ4EQJXG5iuW4UqgP7qBopLpj84mpkNx3wPjM= +github.com/aws/aws-sdk-go-v2 v1.39.3/go.mod h1:yWSxrnioGUZ4WVv9TgMrNUeLV3PFESn/v+6T/Su8gnM= +github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.3 h1:tW1/Rkad38LA15X4UQtjXZXNKsCgkshC3EbmcUmghTg= +github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.3/go.mod 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0000000000000000000000000000000000000000..a07cf5d0e70766fd3f612836309aad019da4c4ff --- /dev/null +++ b/examples/moon/main.go @@ -0,0 +1,145 @@ +package main + +// This example demonstrates how to create an agent with a tool that can +// provide moon phase information for a given date, defaulting to today. + +import ( + "context" + "fmt" + "io" + "net/http" + "os" + "time" + + "charm.land/fantasy" + "charm.land/fantasy/providers/anthropic" + "github.com/charmbracelet/lipgloss/v2" + "github.com/charmbracelet/lipgloss/v2/table" + "github.com/charmbracelet/log/v2" + "github.com/charmbracelet/x/term" +) + +const systemPrompt = ` +You are a quiet assistant named Francine who knows about celestial bodies. You +use as few words as possible, but always reply in full, proper sentences. +You never reply with markdown. You always respond with weekdays. + +You also have a cat named Federico who you think performs the actual queries, +and you give him credit in your responses whenever you use the moon phase tool. +` + +func main() { + // We'll use Anthropic for this example. + apiKey := os.Getenv("ANTHROPIC_API_KEY") + if apiKey == "" { + log.Fatal("missing ANTHROPIC_API_KEY") + } + + // Specifically, we'll use Claude Haiku 4.5. + provider := anthropic.New(anthropic.WithAPIKey(apiKey)) + model, err := provider.LanguageModel("claude-haiku-4-5-20251001") + if err != nil { + log.Fatalf("failed to get language model: %v", err) + } + + // Add a moon phase tool. + moonTool := fantasy.NewAgentTool( + "moon_phase", + "Get information about the moon phase", + moonPhaseTool, + ) + + // Create the agent. + agent := fantasy.NewAgent( + model, + fantasy.WithSystemPrompt(systemPrompt), + fantasy.WithTools(moonTool), + ) + + // Here's our prompt. + const prompt = "What is the moon phase today? And what will it be on December 31, 2025?" + fmt.Println("\n" + formatText(prompt)) + + // Let's go! Ask the agent to generate a response. + result, err := agent.Generate(context.Background(), fantasy.AgentCall{Prompt: prompt}) + if err != nil { + log.Fatalf("agent generation failed: %v", err) + } + + // Print out the final response. + fmt.Println(formatText(result.Response.Content.Text())) + + // Print out usage statistics. + t := table.New(). + StyleFunc(func(row, col int) lipgloss.Style { + return lipgloss.NewStyle().Padding(0, 1) + }). + Row("Tokens in", fmt.Sprint(result.TotalUsage.InputTokens)). + Row("Tokens out", fmt.Sprint(result.TotalUsage.OutputTokens)). + Row("Steps", fmt.Sprint(len(result.Steps))) + fmt.Print(lipgloss.NewStyle().MarginLeft(3).Render(t.String()), "\n\n") +} + +type moonPhaseInput struct { + Date string `json:"date,omitempty" description:"Optional date in YYYY-MM-DD; if omitted, use today"` +} + +// moonPhaseTool queries wttr.in for the moon phase on a given date. If no +// date is provided, it uses today's date. +// +// The date format should be in YYYY-MM-DD format. +func moonPhaseTool(ctx context.Context, input moonPhaseInput, _ fantasy.ToolCall) (fantasy.ToolResponse, error) { + url := "https://wttr.in/moon?T&q" + + // Validate date format if provided, and update the URL accordingly. + if input.Date != "" { + if _, timeErr := time.Parse("2006-01-02", input.Date); timeErr != nil { + return fantasy.NewTextErrorResponse("invalid date format; use YYYY-MM-DD"), nil + } + url = "https://wttr.in/moon@" + input.Date + "?T&q" + } + + // Prepare an HTTP request. + req, reqErr := http.NewRequestWithContext(ctx, http.MethodGet, url, nil) + if reqErr != nil { + return fantasy.NewTextErrorResponse("failed to build request: " + reqErr.Error()), nil + } + + // wttr.in changes rendering based on the user agent, so we + // need to set a user agent to force plain text. + req.Header.Set("User-Agent", "curl/8.0") + + // Perform the HTTP request. + resp, reqErr := http.DefaultClient.Do(req) + if reqErr != nil { + return fantasy.NewTextErrorResponse("request failed: " + reqErr.Error()), nil + } + + // Read the response body. + defer resp.Body.Close() + b, readErr := io.ReadAll(resp.Body) + if readErr != nil { + return fantasy.NewTextErrorResponse("read failed: " + readErr.Error()), nil + } + + // Did it work? + if resp.StatusCode >= 400 { + return fantasy.NewTextErrorResponse("wttr.in error: " + resp.Status + "\n" + string(b)), nil + } + + // It worked! + return fantasy.NewTextResponse(string(b)), nil +} + +// Just a Lip Gloss text formatter. +var formatText func(...string) string + +// Setup the text formatter based on terminal width so we can wrap lines +// nicely. +func init() { + w, _, err := term.GetSize(os.Stdout.Fd()) + if err != nil { + log.Fatalf("failed to get terminal size: %v", err) + } + formatText = lipgloss.NewStyle().Padding(0, 3, 1, 3).Width(w).Render +}