diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index fac1407..7c31fce 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.20"
+  ".": "0.1.0-alpha.21"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index f3dbd23..97ade5f 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
-configured_endpoints: 15
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/stainless%2Fstainless-v0-ddcc03297d5649ca543ccff5be72ca1c148696cdddf63cb640e3f8a9b86ab59e.yml
-openapi_spec_hash: 2870606e51060e9080104b1089f28b83
-config_hash: 3390d0ac1f2bb2f8e759f7758d1312c7
+configured_endpoints: 16
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/stainless%2Fstainless-v0-0eed0c3c47bb630ed692f2de1c5228e3e1a29f52489851aecc0b9f9f3b5bce61.yml
+openapi_spec_hash: c62aa08b1662b81b6ede9e298e4f1882
+config_hash: 8a921dfc8d183e865a02718de6783412
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 81d578c..1a9995f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 0.1.0-alpha.21 (2025-06-23)
+
+Full Changelog: [v0.1.0-alpha.20...v0.1.0-alpha.21](https://github.com/stainless-api/stainless-api-cli/compare/v0.1.0-alpha.20...v0.1.0-alpha.21)
+
+### Features
+
+* **api:** add diagnostics endpoint ([5bb2beb](https://github.com/stainless-api/stainless-api-cli/commit/5bb2beb07061e9699818db4858c1634223bcaf3d))
+
+
+### Chores
+
+* bump go sdk version ([a72a797](https://github.com/stainless-api/stainless-api-cli/commit/a72a79734aa7afd8fe25ae80ff963e688a55ede0))
+
 ## 0.1.0-alpha.20 (2025-06-23)
 
 Full Changelog: [v0.1.0-alpha.19...v0.1.0-alpha.20](https://github.com/stainless-api/stainless-api-cli/compare/v0.1.0-alpha.19...v0.1.0-alpha.20)
diff --git a/go.mod b/go.mod
index 81425e0..5ff5d87 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/charmbracelet/lipgloss v1.1.0
 	github.com/logrusorgru/aurora/v4 v4.0.0
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c
-  github.com/stainless-api/stainless-api-go v0.9.0
+	github.com/stainless-api/stainless-api-go v0.10.0
 	github.com/tidwall/gjson v1.17.0
 	github.com/tidwall/pretty v1.2.1
 	github.com/tidwall/sjson v1.2.5
diff --git a/go.sum b/go.sum
index 82534dd..9bbbb15 100644
--- a/go.sum
+++ b/go.sum
@@ -69,8 +69,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
-github.com/stainless-api/stainless-api-go v0.9.0 h1:HlPcGQT6FX1/oPhpJTo46uBAjgwmUdzW7S97fMD0Gp0=
-github.com/stainless-api/stainless-api-go v0.9.0/go.mod h1:9Q2t8xq6EFgw8HYOsVxqKEfSDVe9eqCoh1zC0HMRwTY=
+github.com/stainless-api/stainless-api-go v0.10.0 h1:OYfOwfvAmGtr+7aaV8WaxYoYtVIcj8nzQBQyuTocHOc=
+github.com/stainless-api/stainless-api-go v0.10.0/go.mod h1:9Q2t8xq6EFgw8HYOsVxqKEfSDVe9eqCoh1zC0HMRwTY=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
diff --git a/pkg/cmd/builddiagnostic.go b/pkg/cmd/builddiagnostic.go
new file mode 100644
index 0000000..705a0b7
--- /dev/null
+++ b/pkg/cmd/builddiagnostic.go
@@ -0,0 +1,78 @@
+// File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/stainless-api/stainless-api-cli/pkg/jsonflag"
+	"github.com/stainless-api/stainless-api-go"
+	"github.com/stainless-api/stainless-api-go/option"
+	"github.com/urfave/cli/v3"
+)
+
+var buildsDiagnosticsList = cli.Command{
+	Name:  "list",
+	Usage: "Get diagnostics for a build",
+	Flags: []cli.Flag{
+		&cli.StringFlag{
+			Name: "build-id",
+		},
+		&jsonflag.JSONStringFlag{
+			Name: "cursor",
+			Config: jsonflag.JSONConfig{
+				Kind: jsonflag.Query,
+				Path: "cursor",
+			},
+		},
+		&jsonflag.JSONFloatFlag{
+			Name: "limit",
+			Config: jsonflag.JSONConfig{
+				Kind: jsonflag.Query,
+				Path: "limit",
+			},
+		},
+		&jsonflag.JSONStringFlag{
+			Name: "severity",
+			Config: jsonflag.JSONConfig{
+				Kind: jsonflag.Query,
+				Path: "severity",
+			},
+		},
+		&jsonflag.JSONStringFlag{
+			Name: "targets",
+			Config: jsonflag.JSONConfig{
+				Kind: jsonflag.Query,
+				Path: "targets.#",
+			},
+		},
+		&jsonflag.JSONStringFlag{
+			Name: "+target",
+			Config: jsonflag.JSONConfig{
+				Kind: jsonflag.Query,
+				Path: "targets.-1",
+			},
+		},
+	},
+	Action:          handleBuildsDiagnosticsList,
+	HideHelpCommand: true,
+}
+
+func handleBuildsDiagnosticsList(ctx context.Context, cmd *cli.Command) error {
+	cc := getAPICommandContext(cmd)
+	params := stainlessv0.BuildDiagnosticListParams{}
+	res, err := cc.client.Builds.Diagnostics.List(
+		context.TODO(),
+		cmd.Value("build-id").(string),
+		params,
+		option.WithMiddleware(cc.AsMiddleware()),
+	)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("%s\n", ColorizeJSON(res.RawJSON(), os.Stdout))
+	return nil
+}
diff --git a/pkg/cmd/cmd.go b/pkg/cmd/cmd.go
index 6d5c1eb..640064f 100644
--- a/pkg/cmd/cmd.go
+++ b/pkg/cmd/cmd.go
@@ -74,6 +74,13 @@ var Command = cli.Command{
 			},
 		},
 
+		{
+			Name: "builds:diagnostics",
+			Commands: []*cli.Command{
+				&buildsDiagnosticsList,
+			},
+		},
+
 		{
 			Name: "builds:target_outputs",
 			Commands: []*cli.Command{