diff --git a/pkg/stripe/analytics_telemetry.go b/pkg/stripe/analytics_telemetry.go
index ba4c22a61..69fbd7bab 100644
--- a/pkg/stripe/analytics_telemetry.go
+++ b/pkg/stripe/analytics_telemetry.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"os"
 	"runtime"
 	"strconv"
 	"strings"
@@ -43,6 +44,7 @@ type CLIAnalyticsEventMetadata struct {
 	CLIVersion        string `url:"cli_version"`        // the version of the CLI
 	OS                string `url:"os"`                 // the OS of the system
 	GeneratedResource bool   `url:"generated_resource"` // whether or not this was a generated resource
+	AIAgent           string `url:"ai_agent,omitempty"` // the AI coding agent that invoked the CLI, if any
 }
 
 // TelemetryClient is an interface that can send two types of events: an API request, and just general events.
@@ -72,6 +74,7 @@ func NewEventMetadata() *CLIAnalyticsEventMetadata {
 		InvocationID: uuid.NewString(),
 		CLIVersion:   version.Version,
 		OS:           runtime.GOOS,
+		AIAgent:      DetectAIAgent(os.Getenv),
 	}
 }
 
@@ -237,3 +240,30 @@ func TelemetryOptedOut(optoutVar string) bool {
 
 	return optoutVar == "1" || optoutVar == "true"
 }
+
+// DetectAIAgent detects if the CLI was invoked by a coding agent, based on well-known env vars.
+// It accepts an environment getter function to allow testing without modifying the actual environment.
+func DetectAIAgent(getEnv func(string) string) string {
+	if getEnv("ANTIGRAVITY_CLI_ALIAS") != "" {
+		return "antigravity"
+	}
+	if getEnv("CLAUDECODE") != "" {
+		return "claude_code"
+	}
+	if getEnv("CLINE_ACTIVE") != "" {
+		return "cline"
+	}
+	if getEnv("CODEX_SANDBOX") != "" {
+		return "codex_cli"
+	}
+	if getEnv("CURSOR_AGENT") != "" {
+		return "cursor"
+	}
+	if getEnv("GEMINI_CLI") != "" {
+		return "gemini_cli"
+	}
+	if getEnv("OPENCODE") != "" {
+		return "open_code"
+	}
+	return ""
+}
diff --git a/pkg/stripe/analytics_telemetry_test.go b/pkg/stripe/analytics_telemetry_test.go
index 6dc03b06d..2672a4a6e 100644
--- a/pkg/stripe/analytics_telemetry_test.go
+++ b/pkg/stripe/analytics_telemetry_test.go
@@ -96,6 +96,8 @@ func TestSendAPIRequestEvent(t *testing.T) {
 		require.Contains(t, bodyString, "os=darwin")
 		require.Contains(t, bodyString, "request_id=req_zzz")
 		require.Contains(t, bodyString, "user_agent=Unit+Test")
+		// ai_agent should not be present when empty (omitempty)
+		require.NotContains(t, bodyString, "ai_agent")
 	}))
 	defer ts.Close()
 	baseURL, _ := url.Parse(ts.URL)
@@ -149,6 +151,8 @@ func TestSendEvent(t *testing.T) {
 		require.Contains(t, bodyString, "merchant=acct_1234")
 		require.Contains(t, bodyString, "os=darwin")
 		require.Contains(t, bodyString, "user_agent=Unit+Test")
+		// ai_agent should not be present when empty (omitempty)
+		require.NotContains(t, bodyString, "ai_agent")
 	}))
 	defer ts.Close()
 	baseURL, _ := url.Parse(ts.URL)
@@ -167,6 +171,33 @@ func TestSendEvent(t *testing.T) {
 	analyticsClient.SendEvent(processCtx, "foo", "bar")
 }
 
+func TestSendEvent_WithAIAgent(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		body, err := io.ReadAll(r.Body)
+		require.NoError(t, err)
+		bodyString := string(body)
+		require.Contains(t, bodyString, "ai_agent=cursor")
+	}))
+	defer ts.Close()
+	baseURL, _ := url.Parse(ts.URL)
+
+	// Create metadata and manually set AIAgent field
+	telemetryMetadata := &stripe.CLIAnalyticsEventMetadata{
+		InvocationID:      "123456",
+		UserAgent:         "Unit Test",
+		CLIVersion:        "master",
+		OS:                "darwin",
+		CommandPath:       "stripe test",
+		Merchant:          "acct_1234",
+		GeneratedResource: false,
+		AIAgent:           "cursor",
+	}
+
+	processCtx := stripe.WithEventMetadata(context.Background(), telemetryMetadata)
+	analyticsClient := stripe.AnalyticsTelemetryClient{BaseURL: baseURL, HTTPClient: &http.Client{}}
+	analyticsClient.SendEvent(processCtx, "foo", "bar")
+}
+
 func TestSkipsSendEventWhenMetadataIsEmpty(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		require.Fail(t, "Did not expect to reach sendData")
@@ -191,3 +222,67 @@ func TestTelemetryOptedOut(t *testing.T) {
 	require.True(t, stripe.TelemetryOptedOut("True"))
 	require.True(t, stripe.TelemetryOptedOut("TRUE"))
 }
+
+// AI Agent Detection Tests
+func TestDetectAIAgent_WithClaudeCode(t *testing.T) {
+	// Mock env getter that returns CLAUDECODE
+	getEnv := func(key string) string {
+		if key == "CLAUDECODE" {
+			return "1"
+		}
+		return ""
+	}
+	result := stripe.DetectAIAgent(getEnv)
+	require.Equal(t, "claude_code", result)
+}
+
+func TestDetectAIAgent_NoAgentDetected(t *testing.T) {
+	// Mock env getter that returns empty strings
+	getEnv := func(key string) string {
+		return ""
+	}
+	result := stripe.DetectAIAgent(getEnv)
+	require.Equal(t, "", result)
+}
+
+func TestAIAgentDetection_AllAgents(t *testing.T) {
+	tests := []struct {
+		name     string
+		envVar   string
+		expected string
+	}{
+		{"Antigravity", "ANTIGRAVITY_CLI_ALIAS", "antigravity"},
+		{"Claude Code", "CLAUDECODE", "claude_code"},
+		{"Cline", "CLINE_ACTIVE", "cline"},
+		{"Codex CLI", "CODEX_SANDBOX", "codex_cli"},
+		{"Cursor", "CURSOR_AGENT", "cursor"},
+		{"Gemini CLI", "GEMINI_CLI", "gemini_cli"},
+		{"Open Code", "OPENCODE", "open_code"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Mock env getter that returns only the specific env var being tested
+			getEnv := func(key string) string {
+				if key == tt.envVar {
+					return "true"
+				}
+				return ""
+			}
+			result := stripe.DetectAIAgent(getEnv)
+			require.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+func TestAIAgentDetection_Priority(t *testing.T) {
+	// Test that the first matching env var wins (antigravity comes before cursor)
+	getEnv := func(key string) string {
+		if key == "ANTIGRAVITY_CLI_ALIAS" || key == "CURSOR_AGENT" {
+			return "1"
+		}
+		return ""
+	}
+	result := stripe.DetectAIAgent(getEnv)
+	require.Equal(t, "antigravity", result)
+}