diff --git a/cmd/build_info.go b/cmd/build_info.go
index f94e1db..94ba8fd 100644
--- a/cmd/build_info.go
+++ b/cmd/build_info.go
@@ -3,6 +3,8 @@ package cmd
 import (
 	"runtime/debug"
 	"strings"
+
+	"github.com/loops-so/loops-go"
 )
 
 var (
@@ -48,6 +50,7 @@ func init() {
 	if sdkVersion != "" {
 		parts = append(parts, "sdk "+sdkVersion)
 	}
+	parts = append(parts, "spec "+loops.SpecVersion)
 	suffix := ""
 	if len(parts) > 0 {
 		suffix = " (" + strings.Join(parts, ", ") + ")"
diff --git a/cmd/campaigns.go b/cmd/campaigns.go
index b2af86f..f443559 100644
--- a/cmd/campaigns.go
+++ b/cmd/campaigns.go
@@ -359,6 +359,7 @@ var campaignsGetCmd = &cobra.Command{
 func printCampaign(cmd *cobra.Command, c *loops.Campaign) error {
 	t := newStyledTable(cmd.OutOrStdout(), "FIELD", "VALUE")
 	t.Row("campaignId", c.ID)
+	t.Row("url", c.URL)
 	t.Row("emailMessageId", deref(c.EmailMessageID))
 	t.Row("name", c.Name)
 	t.Row("status", c.Status)
diff --git a/cmd/transactional.go b/cmd/transactional.go
index 859c5ad..5238add 100644
--- a/cmd/transactional.go
+++ b/cmd/transactional.go
@@ -293,6 +293,7 @@ var transactionalPublishCmd = &cobra.Command{
 func printTransactional(cmd *cobra.Command, tx *loops.Transactional) error {
 	t := newStyledTable(cmd.OutOrStdout(), "FIELD", "VALUE")
 	t.Row("transactionalId", tx.ID)
+	t.Row("url", tx.URL)
 	t.Row("name", tx.Name)
 	t.Row("transactionalGroupId", deref(tx.TransactionalGroupID))
 	t.Row("draftEmailMessageId", deref(tx.DraftEmailMessageID))
diff --git a/cmd/workflows.go b/cmd/workflows.go
index 378cf3b..d8bfe3a 100644
--- a/cmd/workflows.go
+++ b/cmd/workflows.go
@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"slices"
@@ -117,6 +118,7 @@ var workflowsGetCmd = &cobra.Command{
 func printSimplifiedWorkflow(cmd *cobra.Command, w *loops.SimplifiedWorkflow) error {
 	t := newStyledTable(cmd.OutOrStdout(), "FIELD", "VALUE")
 	t.Row("workflowId", w.ID)
+	t.Row("url", w.URL)
 	t.Row("name", w.Name)
 	t.Row("description", w.Description)
 	t.Row("emoji", w.Emoji)
@@ -458,6 +460,10 @@ func runWorkflowsChangeMailingList(cfg *config.Config, id string, req loops.Chan
 	return newAPIClient(cfg).ChangeWorkflowMailingList(id, req)
 }
 
+func runWorkflowsDelete(cfg *config.Config, id string, req loops.DeleteWorkflowRequest) error {
+	return newAPIClient(cfg).DeleteWorkflow(id, req)
+}
+
 func runWorkflowsNodeCreate(cfg *config.Config, id string, req loops.CreateWorkflowNodeRequest) (*loops.CreateWorkflowNodeResponse, error) {
 	return newAPIClient(cfg).CreateWorkflowNode(id, req)
 }
@@ -828,6 +834,48 @@ var workflowsNodesDeleteCmd = &cobra.Command{
 	},
 }
 
+// apiConfirmSentence is the trailing sentence the API adds to a
+// confirmation-required delete error. It is replaced with CLI guidance.
+const apiConfirmSentence = "Confirm deletion by sending a second request with confirmDelete: true."
+
+var workflowsDeleteCmd = &cobra.Command{
+	Use:   "delete <id>",
+	Short: "Delete a workflow",
+	Long: "Deletes a workflow. A workflow that is sending or has queued contacts is not deleted on the first\n" +
+		"attempt; re-run with --confirm to delete it, stop sending, and cancel its queued contacts.",
+	Args: cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		cfg, err := loadConfig()
+		if err != nil {
+			return err
+		}
+
+		confirm, _ := cmd.Flags().GetBool("confirm")
+		err = runWorkflowsDelete(cfg, args[0], loops.DeleteWorkflowRequest{
+			ExpectedRevisionID: readExpectedRevisionID(cmd),
+			ConfirmDelete:      confirm,
+		})
+		if errors.Is(err, loops.ErrWorkflowDeleteConfirmationRequired) {
+			var apiErr *loops.APIError
+			msg := err.Error()
+			if errors.As(err, &apiErr) {
+				msg = apiErr.Message
+			}
+			msg = strings.TrimSpace(strings.TrimSuffix(strings.TrimSpace(msg), apiConfirmSentence))
+			return fmt.Errorf("%s Re-run with --confirm to delete it anyway", msg)
+		}
+		if err != nil {
+			return err
+		}
+
+		if isJSONOutput() {
+			return printJSON(cmd.OutOrStdout(), Result{Success: true})
+		}
+		fmt.Fprintln(cmd.OutOrStdout(), "Deleted.")
+		return nil
+	},
+}
+
 // mutationNodeID returns the ID of the active variant of a WorkflowMutationNode.
 func mutationNodeID(n *loops.WorkflowMutationNode) string {
 	switch n.TypeName {
@@ -895,6 +943,10 @@ func init() {
 	workflowsCreateCmd.MarkFlagRequired("name")
 	workflowsCmd.AddCommand(workflowsCreateCmd)
 
+	workflowsDeleteCmd.Flags().String("expected-revision-id", "", "Expected workflow revision ID (optimistic concurrency)")
+	workflowsDeleteCmd.Flags().Bool("confirm", false, "Confirm deletion of a workflow that is sending or has queued contacts")
+	workflowsCmd.AddCommand(workflowsDeleteCmd)
+
 	workflowsUpdateCmd.Flags().StringP("name", "n", "", "Workflow name")
 	workflowsUpdateCmd.Flags().StringP("description", "d", "", "Workflow description")
 	workflowsUpdateCmd.Flags().String("expected-revision-id", "", "Expected workflow revision ID (optimistic concurrency)")
diff --git a/cmd/workflows_delete_test.go b/cmd/workflows_delete_test.go
new file mode 100644
index 0000000..25959d9
--- /dev/null
+++ b/cmd/workflows_delete_test.go
@@ -0,0 +1,82 @@
+package cmd
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"testing"
+
+	"github.com/loops-so/loops-go"
+)
+
+func TestRunWorkflowsDelete(t *testing.T) {
+	t.Run("sends expectedRevisionId and omits confirmDelete when false", func(t *testing.T) {
+		cap := serveJSONCapture(t, http.StatusNoContent, "")
+		rev := "rev_1"
+		if err := runWorkflowsDelete(cfg(t), "wf_abc", loops.DeleteWorkflowRequest{ExpectedRevisionID: &rev}); err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if cap.Method != http.MethodDelete {
+			t.Errorf("Method = %q, want DELETE", cap.Method)
+		}
+		if cap.Path != "/workflows/wf_abc" {
+			t.Errorf("Path = %q, want /workflows/wf_abc", cap.Path)
+		}
+
+		var body map[string]any
+		if err := json.Unmarshal(cap.Body, &body); err != nil {
+			t.Fatalf("unmarshal body: %v", err)
+		}
+		if body["expectedRevisionId"] != "rev_1" {
+			t.Errorf("expectedRevisionId = %v, want rev_1", body["expectedRevisionId"])
+		}
+		if _, ok := body["confirmDelete"]; ok {
+			t.Errorf("confirmDelete present, want omitted")
+		}
+	})
+
+	t.Run("sends null revision and confirmDelete when confirmed", func(t *testing.T) {
+		cap := serveJSONCapture(t, http.StatusNoContent, "")
+		if err := runWorkflowsDelete(cfg(t), "wf_abc", loops.DeleteWorkflowRequest{ConfirmDelete: true}); err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+
+		var body map[string]any
+		if err := json.Unmarshal(cap.Body, &body); err != nil {
+			t.Fatalf("unmarshal body: %v", err)
+		}
+		v, ok := body["expectedRevisionId"]
+		if !ok || v != nil {
+			t.Errorf("expectedRevisionId = %v (present %v), want JSON null", v, ok)
+		}
+		if body["confirmDelete"] != true {
+			t.Errorf("confirmDelete = %v, want true", body["confirmDelete"])
+		}
+	})
+
+	t.Run("reports confirmation required on 409 with the confirm sentence", func(t *testing.T) {
+		serveJSON(t, http.StatusConflict, `{"success":false,"message":"This workflow is currently sending to 12 contacts. `+apiConfirmSentence+`"}`)
+		err := runWorkflowsDelete(cfg(t), "wf_abc", loops.DeleteWorkflowRequest{})
+		if !errors.Is(err, loops.ErrWorkflowDeleteConfirmationRequired) {
+			t.Fatalf("error = %v, want ErrWorkflowDeleteConfirmationRequired", err)
+		}
+		var apiErr *loops.APIError
+		if !errors.As(err, &apiErr) {
+			t.Fatalf("error does not unwrap to *loops.APIError: %v", err)
+		}
+		if apiErr.StatusCode != http.StatusConflict {
+			t.Errorf("StatusCode = %d, want 409", apiErr.StatusCode)
+		}
+	})
+
+	t.Run("a stale revision 409 is a plain API error", func(t *testing.T) {
+		serveJSON(t, http.StatusConflict, `{"success":false,"message":"Workflow revision is out of date."}`)
+		err := runWorkflowsDelete(cfg(t), "wf_abc", loops.DeleteWorkflowRequest{})
+		if err == nil {
+			t.Fatal("expected error, got nil")
+		}
+		if errors.Is(err, loops.ErrWorkflowDeleteConfirmationRequired) {
+			t.Errorf("stale revision reported as confirmation required: %v", err)
+		}
+	})
+}
diff --git a/go.mod b/go.mod
index 7e8399e..a8dc0e0 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/loops-so/cli
 
-go 1.26.5
+go 1.26.7
 
 require (
 	charm.land/fang/v2 v2.0.1
@@ -9,7 +9,7 @@ require (
 	github.com/atotto/clipboard v0.1.4
 	github.com/charmbracelet/colorprofile v0.4.2
 	github.com/charmbracelet/x/term v0.2.2
-	github.com/loops-so/loops-go v0.5.0
+	github.com/loops-so/loops-go v0.6.0
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/pflag v1.0.10
 	github.com/zalando/go-keyring v0.2.6
diff --git a/go.sum b/go.sum
index 705a743..0cdf174 100644
--- a/go.sum
+++ b/go.sum
@@ -299,8 +299,8 @@ github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfn
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
-github.com/loops-so/loops-go v0.5.0 h1:Oh77cLVmD+UYA86LzvNqwrFyh8uHoPA20IcSdqZJ2ZM=
-github.com/loops-so/loops-go v0.5.0/go.mod h1:BDzBhAn/4e2QSKXrpXufIpSuH8xUPv9oa+hazH01ejE=
+github.com/loops-so/loops-go v0.6.0 h1:j0D5W3iRsZwuQyI0BZRBloyIDjTnYisWPajrgqV/ku4=
+github.com/loops-so/loops-go v0.6.0/go.mod h1:BDzBhAn/4e2QSKXrpXufIpSuH8xUPv9oa+hazH01ejE=
 github.com/lucasb-eyer/go-colorful v1.3.0 h1:2/yBRLdWBZKrf7gB40FoiKfAWYQ0lqNcbuQwVHXptag=
 github.com/lucasb-eyer/go-colorful v1.3.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/lyft/protoc-gen-star v0.5.3/go.mod h1:V0xaHgaf5oCCqmcxYcWiDfTiKsZsRc87/1qhoTACD8w=
diff --git a/mise.toml b/mise.toml
index cd0d999..c0c04bf 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,5 +1,5 @@
 [tools]
-go = "1.26.4"
+go = "1.26.7"
 
 # goreleaser-pro is required, but not available via mise. try,
 # brew install --cask goreleaser/tap/goreleaser-pro