feat(contrib/mcp-go): Initial mcp-go tracer implementation

contrib/mark3labs/mcp-go/README.md

@@ -0,0 +1,36 @@
+# MCP-Go Integration
+
+This integration provides Datadog tracing for the [mark3labs/mcp-go](https://github.com/mark3labs/mcp-go) library.
+
+## Usage
+
+```go
+import (
+    mcpgo "github.com/DataDog/dd-trace-go/contrib/mark3labs/mcp-go/v2"
+    "github.com/DataDog/dd-trace-go/v2/ddtrace/tracer"
+    "github.com/mark3labs/mcp-go/server"
+)
+
+func main() {
+    tracer.Start()
+    // Cleanup internal caches
+    defer tracer.Stop()
+
+    // Create Datadog hooks
+    ddHooks := mcpgo.NewHooks()
+    defer ddHooks.Stop()
+
+    // Add tracing to your existing hooks object
+    hooks := &server.Hooks{}
+    ddHooks.AddHooks(hooks)
+
+    // Use hooks with your MCP server
+    // srv := server.NewMCPServer("my-server", "1.0.0",
+    //     server.WithHooks(hooks))
+}
+```
+
+## Features
+
+The integration automatically traces:
+- **Tool calls**: Creates LLMObs tool spans with input/output annotation for all tool invocations

contrib/mark3labs/mcp-go/example_test.go

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+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2016 Datadog, Inc.
+
+package mcpgo_test
+
+import (
+	mcpgo "github.com/DataDog/dd-trace-go/contrib/mark3labs/mcp-go/v2"
+	"github.com/DataDog/dd-trace-go/v2/ddtrace/tracer"
+	"github.com/mark3labs/mcp-go/server"
+)
+
+func Example() {
+	tracer.Start()
+	defer tracer.Stop()
+
+	// Create Datadog hooks
+	ddHooks := mcpgo.NewHooks()
+	defer ddHooks.Stop()
+
+	// Create server hooks and add Datadog tracing
+	hooks := &server.Hooks{}
+	ddHooks.AddHooks(hooks)
+
+	// Use hooks with your MCP server
+	// srv := server.NewMCPServer("my-server", "1.0.0",
+	//     server.WithHooks(hooks))
+	_ = hooks
+}
+

contrib/mark3labs/mcp-go/go.mod

@@ -0,0 +1,103 @@
+module github.com/DataDog/dd-trace-go/contrib/mark3labs/mcp-go/v2
+
+go 1.24.0
+
+require (
+	github.com/DataDog/dd-trace-go/v2 v2.4.0-dev
+	github.com/jellydator/ttlcache/v3 v3.4.0
+	github.com/mark3labs/mcp-go v0.42.0
+	github.com/stretchr/testify v1.10.0
+)
+
+require (
+	github.com/DataDog/datadog-agent/comp/core/tagger/origindetection v0.67.0 // indirect
+	github.com/DataDog/datadog-agent/pkg/obfuscate v0.67.0 // indirect
+	github.com/DataDog/datadog-agent/pkg/proto v0.67.0 // indirect
+	github.com/DataDog/datadog-agent/pkg/remoteconfig/state v0.69.0 // indirect
+	github.com/DataDog/datadog-agent/pkg/trace v0.67.0 // indirect
+	github.com/DataDog/datadog-agent/pkg/util/log v0.67.0 // indirect
+	github.com/DataDog/datadog-agent/pkg/util/scrubber v0.67.0 // indirect
+	github.com/DataDog/datadog-agent/pkg/version v0.67.0 // indirect
+	github.com/DataDog/datadog-go/v5 v5.6.0 // indirect
+	github.com/DataDog/go-libddwaf/v4 v4.5.0 // indirect
+	github.com/DataDog/go-runtime-metrics-internal v0.0.4-0.20250721125240-fdf1ef85b633 // indirect
+	github.com/DataDog/go-sqllexer v0.1.6 // indirect
+	github.com/DataDog/go-tuf v1.1.0-0.5.2 // indirect
+	github.com/DataDog/opentelemetry-mapping-go/pkg/otlp/attributes v0.27.0 // indirect
+	github.com/DataDog/sketches-go v1.4.7 // indirect
+	github.com/Masterminds/semver/v3 v3.3.1 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/bahlo/generic-list-go v0.2.0 // indirect
+	github.com/buger/jsonparser v1.1.1 // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575 // indirect
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/ebitengine/purego v0.8.3 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/go-version v1.7.0 // indirect
+	github.com/invopop/jsonschema v0.13.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.3 // indirect
+	github.com/lufia/plan9stats v0.0.0-20240909124753-873cd0166683 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/minio/simdjson-go v0.4.5 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
+	github.com/outcaste-io/ristretto v0.2.3 // indirect
+	github.com/philhofer/fwd v1.1.3-0.20240916144458-20a13a1f6b7c // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
+	github.com/puzpuzpuz/xsync/v3 v3.5.1 // indirect
+	github.com/secure-systems-lab/go-securesystemslib v0.9.0 // indirect
+	github.com/shirou/gopsutil/v4 v4.25.3 // indirect
+	github.com/spf13/cast v1.7.1 // indirect
+	github.com/theckman/httpforwarded v0.4.0 // indirect
+	github.com/tinylib/msgp v1.2.5 // indirect
+	github.com/tklauser/go-sysconf v0.3.14 // indirect
+	github.com/tklauser/numcpus v0.9.0 // indirect
+	github.com/wk8/go-ordered-map/v2 v2.1.8 // indirect
+	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/collector/component v1.31.0 // indirect
+	go.opentelemetry.io/collector/featuregate v1.31.0 // indirect
+	go.opentelemetry.io/collector/internal/telemetry v0.125.0 // indirect
+	go.opentelemetry.io/collector/pdata v1.31.0 // indirect
+	go.opentelemetry.io/collector/semconv v0.125.0 // indirect
+	go.opentelemetry.io/contrib/bridges/otelzap v0.10.0 // indirect
+	go.opentelemetry.io/otel v1.35.0 // indirect
+	go.opentelemetry.io/otel/log v0.11.0 // indirect
+	go.opentelemetry.io/otel/metric v1.35.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.35.0 // indirect
+	go.opentelemetry.io/otel/trace v1.35.0 // indirect
+	go.uber.org/atomic v1.11.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/exp v0.0.0-20250408133849-7e4ce0ab07d0 // indirect
+	golang.org/x/mod v0.25.0 // indirect
+	golang.org/x/net v0.40.0 // indirect
+	golang.org/x/sync v0.15.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.26.0 // indirect
+	golang.org/x/time v0.11.0 // indirect
+	golang.org/x/xerrors v0.0.0-20231012003039-104605ab7028 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250425173222-7b384671a197 // indirect
+	google.golang.org/grpc v1.72.0 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
+
+replace github.com/DataDog/dd-trace-go/v2 => ../../..