feat: add amazon nova bedrock support

.gitignore

@@ -40,3 +40,6 @@ Thumbs.db
 
 manpages/
 *.patch
+
+# Property-based testing cache
+testdata/

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/RealAlexandreAI/json-repair v0.0.15
 	github.com/aws/aws-sdk-go-v2 v1.41.1
 	github.com/aws/aws-sdk-go-v2/config v1.32.7
+	github.com/aws/aws-sdk-go-v2/service/bedrockruntime v1.47.2
 	github.com/aws/smithy-go v1.24.0
 	github.com/charmbracelet/anthropic-sdk-go v0.0.0-20251024181547-21d6f3d9a904
 	github.com/charmbracelet/x/exp/slice v0.0.0-20250904123553-b4e2667e5ad5
@@ -20,6 +21,7 @@ require (
 	github.com/stretchr/testify v1.11.1
 	golang.org/x/oauth2 v0.34.0
 	google.golang.org/genai v1.44.0
+	pgregory.net/rapid v1.2.0
 )
 
 require (
@@ -28,7 +30,7 @@ require (
 	cloud.google.com/go/compute/metadata v0.9.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.17.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 // indirect
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.6.3 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.4 // indirect
 	github.com/aws/aws-sdk-go-v2/credentials v1.19.7 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.18.17 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.17 // indirect

go.sum

@@ -20,8 +20,8 @@ github.com/RealAlexandreAI/json-repair v0.0.15 h1:AN8/yt8rcphwQrIs/FZeki+cKaIERU
 github.com/RealAlexandreAI/json-repair v0.0.15/go.mod h1:GKJi5borR78O8c7HCVbgqjhoiVibZ6hJldxbc6dGrAI=
 github.com/aws/aws-sdk-go-v2 v1.41.1 h1:ABlyEARCDLN034NhxlRUSZr4l71mh+T5KAeGh6cerhU=
 github.com/aws/aws-sdk-go-v2 v1.41.1/go.mod h1:MayyLB8y+buD9hZqkCW3kX1AKq07Y5pXxtgB+rRFhz0=
-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 h1:UbnqO+zjqk3uIt9yCACHJ9IVNhyhOCnYk8yA19SAWrM=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.4 h1:489krEF9xIGkOaaX3CE/Be2uWjiXrkCH6gUX+bZA/BU=
+github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.7.4/go.mod h1:IOAPF6oT9KCsceNTvvYMNHy0+kMF8akOjeDvPENWxp4=
 github.com/aws/aws-sdk-go-v2/config v1.32.7 h1:vxUyWGUwmkQ2g19n7JY/9YL8MfAIl7bTesIUykECXmY=
 github.com/aws/aws-sdk-go-v2/config v1.32.7/go.mod h1:2/Qm5vKUU/r7Y+zUk/Ptt2MDAEKAfUtKc1+3U1Mo3oY=
 github.com/aws/aws-sdk-go-v2/credentials v1.19.7 h1:tHK47VqqtJxOymRrNtUXN5SP/zUTvZKeLx4tH6PGQc8=
@@ -34,6 +34,8 @@ github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.17 h1:WWLqlh79iO48yLkj1v
 github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.17/go.mod h1:EhG22vHRrvF8oXSTYStZhJc1aUgKtnJe+aOiFEV90cM=
 github.com/aws/aws-sdk-go-v2/internal/ini v1.8.4 h1:WKuaxf++XKWlHWu9ECbMlha8WOEGm0OUEZqm4K/Gcfk=
 github.com/aws/aws-sdk-go-v2/internal/ini v1.8.4/go.mod h1:ZWy7j6v1vWGmPReu0iSGvRiise4YI5SkR3OHKTZ6Wuc=
+github.com/aws/aws-sdk-go-v2/service/bedrockruntime v1.47.2 h1:p9fvRzUDCTTXd3FuGIHtuMRX21eoh1TB2QMKvdBs9ZM=
+github.com/aws/aws-sdk-go-v2/service/bedrockruntime v1.47.2/go.mod h1:siKVmJdui4dwPPtsKr3F5BAeJxW1MANWaLJnTDfgu7c=
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.4 h1:0ryTNEdJbzUCEWkVXEXoqlXV72J5keC1GvILMOuD00E=
 github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.13.4/go.mod h1:HQ4qwNZh32C3CBeO6iJLQlgtMzqeG17ziAA/3KDJFow=
 github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.13.17 h1:RuNSMoozM8oXlgLG/n6WLaFGoea7/CddrCfIiSA+xdY=
@@ -185,3 +187,5 @@ gopkg.in/dnaeon/go-vcr.v4 v4.0.6-0.20251110073552-01de4eb40290 h1:g3ah7zaWmw41Et
 gopkg.in/dnaeon/go-vcr.v4 v4.0.6-0.20251110073552-01de4eb40290/go.mod h1:sbq5oMEcM4PXngbcNbHhzfCP9OdZodLhrbRYoyg09HY=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+pgregory.net/rapid v1.2.0 h1:keKAYRcjm+e1F0oAuU5F5+YPAWcyxNNRK2wud503Gnk=
+pgregory.net/rapid v1.2.0/go.mod h1:PY5XlDGj0+V1FCq0o192FdRhpKHGTRIWBgqjDBTrq04=

providers/bedrock/README.md

@@ -8,3 +8,70 @@ To see available models, run:
 ```bash
 aws bedrock list-inference-profiles --region us-east-1
 ```
+
+## Amazon Nova Models via Bedrock
+
+Fantasy supports Amazon's Nova family of foundation models through AWS Bedrock. Nova models offer high-quality text generation with competitive pricing and performance.
+
+### Supported Nova Models
+
+- **amazon.nova-pro-v1:0** - High-performance model for complex tasks
+- **amazon.nova-lite-v1:0** - Fast, cost-effective model for simpler tasks
+- **amazon.nova-micro-v1:0** - Ultra-fast model for basic text generation
+- **amazon.nova-premier-v1:0** - Most capable model with advanced reasoning
+
+### Model ID Format
+
+Nova models use the Bedrock model identifier format: `amazon.nova-{variant}-v{version}:{revision}`
+
+When you create a language model instance, Fantasy automatically applies the appropriate region prefix (e.g., `us.amazon.nova-pro-v1:0` for us-east-1).
+
+### AWS Credential Requirements
+
+To use Nova models, you need AWS credentials configured. Fantasy uses the standard AWS SDK credential chain, which checks:
+
+1. Environment variables (`AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`)
+2. AWS credentials file (`~/.aws/credentials`)
+3. IAM role (when running on AWS infrastructure)
+4. Bearer token (`AWS_BEARER_TOKEN_BEDROCK` for testing/development)
+
+You also need to specify the AWS region:
+
+- Set `AWS_REGION` environment variable (e.g., `us-east-1`)
+- If not set, Fantasy defaults to `us-east-1`
+
+### Quick Example
+
+```go
+import "charm.land/fantasy/providers/bedrock"
+
+// Create Bedrock provider
+provider, err := bedrock.New()
+if err != nil {
+    fmt.Fprintln(os.Stderr, "Error:", err)
+    os.Exit(1)
+}
+
+ctx := context.Background()
+
+// Use a Nova model
+model, err := provider.LanguageModel(ctx, "amazon.nova-pro-v1:0")
+if err != nil {
+    fmt.Fprintln(os.Stderr, "Error:", err)
+    os.Exit(1)
+}
+
+// Generate text
+agent := fantasy.NewAgent(model,
+    fantasy.WithSystemPrompt("You are a helpful assistant."),
+)
+
+result, err := agent.Generate(ctx, fantasy.AgentCall{
+    Prompt: "Explain quantum computing in simple terms.",
+})
+if err != nil {
+    fmt.Fprintln(os.Stderr, "Error:", err)
+    os.Exit(1)
+}
+fmt.Println(result.Response.Content.Text())
+```

providers/bedrock/bedrock.go

@@ -2,6 +2,10 @@
 package bedrock
 
 import (
+	"context"
+	"fmt"
+	"strings"
+
 	"charm.land/fantasy"
 	"charm.land/fantasy/providers/anthropic"
 	"github.com/charmbracelet/anthropic-sdk-go/option"
@@ -10,6 +14,8 @@ import (
 type options struct {
 	skipAuth         bool
 	anthropicOptions []anthropic.Option
+	headers          map[string]string
+	client           option.HTTPClient
 }
 
 const (
@@ -20,20 +26,52 @@ const (
 // Option defines a function that configures Bedrock provider options.
 type Option = func(*options)
 
+type provider struct {
+	options           options
+	anthropicProvider fantasy.Provider
+}
+
 // New creates a new Bedrock provider with the given options.
 func New(opts ...Option) (fantasy.Provider, error) {
 	var o options
 	for _, opt := range opts {
 		opt(&o)
 	}
-	return anthropic.New(
+
+	// Create Anthropic provider for anthropic.* models
+	anthropicProvider, err := anthropic.New(
 		append(
 			o.anthropicOptions,
 			anthropic.WithName(Name),
 			anthropic.WithBedrock(),
 			anthropic.WithSkipAuth(o.skipAuth),
 		)...,
 	)
+	if err != nil {
+		return nil, err
+	}
+
+	return &provider{
+		options:           o,
+		anthropicProvider: anthropicProvider,
+	}, nil
+}
+
+// Name returns the provider name.
+func (p *provider) Name() string {
+	return Name
+}
+
+// LanguageModel routes to the appropriate SDK based on model ID prefix.
+func (p *provider) LanguageModel(ctx context.Context, modelID string) (fantasy.LanguageModel, error) {
+	if strings.HasPrefix(modelID, "anthropic.") {
+		// Use Anthropic SDK (existing behavior)
+		return p.anthropicProvider.LanguageModel(ctx, modelID)
+	} else if strings.HasPrefix(modelID, "amazon.") {
+		// Use AWS SDK Converse API (new behavior)
+		return p.createNovaModel(ctx, modelID)
+	}
+	return nil, fmt.Errorf("unsupported model prefix for Bedrock: %s", modelID)
 }
 
 // WithAPIKey sets the access token for the Bedrock provider.
@@ -46,13 +84,15 @@ func WithAPIKey(apiKey string) Option {
 // WithHeaders sets the headers for the Bedrock provider.
 func WithHeaders(headers map[string]string) Option {
 	return func(o *options) {
+		o.headers = headers
 		o.anthropicOptions = append(o.anthropicOptions, anthropic.WithHeaders(headers))
 	}
 }
 
 // WithHTTPClient sets the HTTP client for the Bedrock provider.
 func WithHTTPClient(client option.HTTPClient) Option {
 	return func(o *options) {
+		o.client = client
 		o.anthropicOptions = append(o.anthropicOptions, anthropic.WithHTTPClient(client))
 	}
 }