diff --git a/internal/cli/commands.go b/internal/cli/commands.go
index e2b5163..70a16c2 100644
--- a/internal/cli/commands.go
+++ b/internal/cli/commands.go
@@ -83,7 +83,6 @@ type InitCmd struct {
 type BuildCmd struct {
 	Args    struct{ Names []string } `positional-args:"true"`
 	NoCache bool                     `long:"no-cache" description:"Clear build cache and rebuild from scratch"`
-	Yes     bool                     `short:"y" long:"yes" description:"Skip upload size confirmation prompt"`
 	UI      *UI                      `no-flag:"true"`
 }
 
@@ -516,12 +515,12 @@ func (cmd *BuildCmd) Execute(args []string) error {
 	if ui == nil {
 		ui = defaultUI()
 	}
-	return RunBuild(dir, cmd.Args.Names, cmd.NoCache, cmd.Yes, ui)
+	return RunBuild(dir, cmd.Args.Names, cmd.NoCache, ui)
 }
 
 var errInitDeclined = errors.New("no project config found; run `tx init` to set up your project")
 
-func runBuild(dir string, names []string, noCache bool, skipConfirm bool, ui *UI) error {
+func runBuild(dir string, names []string, noCache bool, ui *UI) error {
 	buildStart := time.Now()
 
 	configPath := filepath.Join(dir, ".texops.yaml")
@@ -661,7 +660,7 @@ func runBuild(dir string, names []string, noCache bool, skipConfirm bool, ui *UI
 			continue
 		}
 
-		if err := handleUpload(ui, inst, projectID, dir, files, syncResult, skipConfirm, sp); err != nil {
+		if err := handleUpload(ui, inst, projectID, dir, files, syncResult, sp); err != nil {
 			// User cancellation should abort the entire build
 			if strings.Contains(err.Error(), "cancelled by user") {
 				return err
@@ -711,7 +710,7 @@ func runBuild(dir string, names []string, noCache bool, skipConfirm bool, ui *UI
 }
 
 // handleUpload processes file sync results and uploads missing files.
-func handleUpload(ui *UI, inst *InstanceClient, projectID, dir string, files []FileEntry, syncResult SyncResult, skipConfirm bool, sp *Spinner) error {
+func handleUpload(ui *UI, inst *InstanceClient, projectID, dir string, files []FileEntry, syncResult SyncResult, sp *Spinner) error {
 	if len(syncResult.Missing) > 0 {
 		knownPaths := make(map[string]bool)
 		filesByPath := make(map[string]FileEntry)
@@ -739,17 +738,6 @@ func handleUpload(ui *UI, inst *InstanceClient, projectID, dir string, files []F
 
 		sp.Stop(fmt.Sprintf("%d files to upload (%s)", len(validMissing), FormatSize(uploadSize)))
 
-		const sizeThreshold = 50_000_000
-		if uploadSize > sizeThreshold && !skipConfirm {
-			confirmed, err := ui.Confirm(fmt.Sprintf("Upload size is %s. Continue?", FormatSize(uploadSize)))
-			if err != nil {
-				return err
-			}
-			if !confirmed {
-				return fmt.Errorf("upload cancelled by user")
-			}
-		}
-
 		uploadLabel := fmt.Sprintf("Uploading %d files", len(validMissing))
 		pb := ui.Progress(uploadLabel, uploadSize)
 		if err := inst.Upload(projectID, dir, validMissing, func(sent, total int64) {
diff --git a/internal/cli/commands_test.go b/internal/cli/commands_test.go
index db9632b..ea31509 100644
--- a/internal/cli/commands_test.go
+++ b/internal/cli/commands_test.go
@@ -721,7 +721,7 @@ documents:
 		os.WriteFile(filepath.Join(dir, "paper.tex"), []byte("\\documentclass{article}\\begin{document}Hello\\end{document}"), 0o600)
 
 		ui, buf := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.NoError(t, err)
 
 		written, err := os.ReadFile(filepath.Join(dir, "paper.pdf"))
@@ -812,7 +812,7 @@ documents:
 		os.WriteFile(filepath.Join(dir, "paper.tex"), []byte("\\documentclass{article}\\begin{document}Hello\\end{document}"), 0o600)
 
 		ui, buf := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.NoError(t, err)
 
 		assert.Equal(t, "prj_auto123", createdProjectID)
@@ -855,7 +855,7 @@ documents:
 		t.Setenv("TX_API_URL", apiSrv.URL)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		// RunBuild will error after project creation (mock only handles /api/projects),
 		// but the project_key generation side effect should have completed.
 		require.Error(t, err)
@@ -876,7 +876,7 @@ func TestBuildCmd_AutoInit(t *testing.T) {
 		os.WriteFile(filepath.Join(dir, "paper.tex"), []byte(`\documentclass{article}\begin{document}Hello\end{document}`), 0o600)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.Error(t, err)
 		assert.Contains(t, err.Error(), "run `tx init` to set up your project")
 	})
@@ -891,7 +891,7 @@ func TestBuildCmd_AutoInit(t *testing.T) {
 		ui := cli.NewUIWithTTYOptions(buf, true, false, in)
 
 		// Build will init then fail on auth — that's fine, we just check init happened.
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 
 		configData, readErr := os.ReadFile(filepath.Join(dir, ".texops.yaml"))
 		require.NoError(t, readErr)
@@ -911,7 +911,7 @@ func TestBuildCmd_AutoInit(t *testing.T) {
 		in := strings.NewReader("n\n")
 		ui := cli.NewUIWithOptions(buf, true, in)
 
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.Error(t, err)
 		assert.Contains(t, err.Error(), "run `tx init` to set up your project")
 
@@ -1004,7 +1004,7 @@ documents:
 		os.WriteFile(filepath.Join(dir, "paper.tex"), []byte("\\documentclass{article}\\begin{document}Hello\\end{document}"), 0o600)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, nil, true, false, ui)
+		err := cli.RunBuild(dir, nil, true, ui)
 		require.NoError(t, err)
 		require.NotNil(t, receivedBuildOptions, "build_options should be sent in request")
 		assert.Equal(t, "true", receivedBuildOptions["no_cache"])
@@ -1089,156 +1089,13 @@ documents:
 		os.WriteFile(filepath.Join(dir, "paper.tex"), []byte("\\documentclass{article}\\begin{document}Hello\\end{document}"), 0o600)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.NoError(t, err)
 		_, hasBuildOptions := receivedBody["build_options"]
 		assert.False(t, hasBuildOptions, "build_options should not be sent when --no-cache is not set")
 	})
 }
 
-func TestBuildCmd_SizeConfirmation(t *testing.T) {
-	// Helper to set up a build environment with files that total the given size.
-	// The instance server reports all files as missing to trigger upload.
-	setupBuild := func(t *testing.T, fileSize int) string {
-		t.Helper()
-
-		pdfContent := []byte("%PDF-1.4 test")
-
-		instSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			switch {
-			case r.URL.Path == "/projects/prj_conf/sync" && r.Method == "POST":
-				// Report main.tex as missing to trigger upload
-				w.Header().Set("Content-Type", "application/json")
-				json.NewEncoder(w).Encode(map[string]any{
-					"missing": []string{"main.tex"},
-				})
-
-			case r.URL.Path == "/projects/prj_conf/upload" && r.Method == "POST":
-				w.WriteHeader(http.StatusOK)
-
-			case r.URL.Path == "/projects/prj_conf/build" && r.Method == "POST":
-				doneData, _ := json.Marshal(map[string]any{
-					"status":   "success",
-					"pdfUrl":   "/projects/prj_conf/builds/bld_001/output",
-					"build_id": "bld_001",
-				})
-				w.Header().Set("Content-Type", "text/event-stream")
-				w.Write([]byte("event: done\ndata: " + string(doneData) + "\n\n"))
-
-			case r.URL.Path == "/projects/prj_conf/builds/bld_001/output" && r.Method == "GET":
-				w.Header().Set("Content-Type", "application/pdf")
-				w.Write(pdfContent)
-
-			default:
-				w.WriteHeader(404)
-			}
-		}))
-		t.Cleanup(instSrv.Close)
-
-		apiSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			switch {
-			case r.URL.Path == "/api/projects" && r.Method == "POST":
-				w.Header().Set("Content-Type", "application/json")
-				w.WriteHeader(http.StatusOK)
-				json.NewEncoder(w).Encode(map[string]string{
-					"id":                   "prj_conf",
-					"name":                 "test",
-					"distribution_version": "texlive:2021",
-				})
-			case r.URL.Path == "/api/projects/prj_conf/session" && r.Method == "POST":
-				w.Header().Set("Content-Type", "application/json")
-				json.NewEncoder(w).Encode(map[string]any{
-					"instance_url": instSrv.URL,
-					"jwt":          "test-jwt",
-					"cache_cold":   false,
-				})
-			default:
-				w.WriteHeader(404)
-			}
-		}))
-		t.Cleanup(apiSrv.Close)
-
-		mockKeyringForAuth(t, "test-jwt-token")
-
-		t.Setenv("TX_API_URL", apiSrv.URL)
-
-		origNewIC := cli.NewInstanceClientFn
-		cli.NewInstanceClientFn = func(instanceURL, jwt string) *cli.InstanceClient {
-			ic := cli.NewInstanceClient(instanceURL, jwt)
-			ic.SetHTTPClient(instSrv.Client())
-			return ic
-		}
-		t.Cleanup(func() { cli.NewInstanceClientFn = origNewIC })
-
-		dir := t.TempDir()
-		configContent := `project_key: "k7Gx9mR2pL4wN8qY5vBt3a"
-texlive: "texlive:2021"
-documents:
-  - name: main
-    main: main.tex
-`
-		os.WriteFile(filepath.Join(dir, ".texops.yaml"), []byte(configContent), 0o600)
-
-		// Create a file of the specified size
-		content := make([]byte, fileSize)
-		for i := range content {
-			content[i] = 'x'
-		}
-		os.WriteFile(filepath.Join(dir, "main.tex"), content, 0o600)
-
-		return dir
-	}
-
-	t.Run("large upload prompts confirmation and user accepts", func(t *testing.T) {
-		dir := setupBuild(t, 51_000_000) // 51 MB, over threshold
-
-		buf := &bytes.Buffer{}
-		ui := cli.NewUIWithOptions(buf, true, strings.NewReader("y\n"))
-		err := cli.RunBuild(dir, nil, false, false, ui)
-		require.NoError(t, err)
-		assert.Contains(t, buf.String(), "Upload size")
-		assert.Contains(t, buf.String(), "[Y/n]")
-	})
-
-	t.Run("large upload prompts confirmation and user declines", func(t *testing.T) {
-		dir := setupBuild(t, 51_000_000) // 51 MB, over threshold
-
-		buf := &bytes.Buffer{}
-		ui := cli.NewUIWithOptions(buf, true, strings.NewReader("n\n"))
-		err := cli.RunBuild(dir, nil, false, false, ui)
-		require.Error(t, err)
-		assert.Contains(t, err.Error(), "upload cancelled by user")
-	})
-
-	t.Run("large upload with --yes skips confirmation", func(t *testing.T) {
-		dir := setupBuild(t, 51_000_000) // 51 MB, over threshold
-
-		ui, buf := testUI()
-		err := cli.RunBuild(dir, nil, false, true, ui) // skipConfirm=true
-		require.NoError(t, err)
-		assert.NotContains(t, buf.String(), "[Y/n]")
-	})
-
-	t.Run("small upload does not prompt confirmation", func(t *testing.T) {
-		dir := setupBuild(t, 1_000) // 1 KB, under threshold
-
-		ui, buf := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
-		require.NoError(t, err)
-		assert.NotContains(t, buf.String(), "[Y/n]")
-	})
-
-	t.Run("large upload auto-confirms in non-TTY mode", func(t *testing.T) {
-		dir := setupBuild(t, 51_000_000) // 51 MB, over threshold
-
-		ui, buf := testUI() // non-TTY
-		err := cli.RunBuild(dir, nil, false, false, ui)
-		require.NoError(t, err)
-		// Non-TTY should auto-confirm without prompt
-		assert.NotContains(t, buf.String(), "[Y/n]")
-	})
-}
-
 func TestBuildCmd_MultiDocument(t *testing.T) {
 	// multiDocSetup creates a common build environment for multi-document tests.
 	// It returns the temp dir and tracks session/build requests.
@@ -1376,7 +1233,7 @@ documents:
 		s := multiDocSetup(t, config, "")
 
 		ui, buf := testUI()
-		err := cli.RunBuild(s.dir, nil, false, false, ui)
+		err := cli.RunBuild(s.dir, nil, false, ui)
 		require.NoError(t, err)
 
 		// Should get exactly one session and one sync for same-version docs
@@ -1411,7 +1268,7 @@ documents:
 		s := multiDocSetup(t, config, "")
 
 		ui, buf := testUI()
-		err := cli.RunBuild(s.dir, nil, false, false, ui)
+		err := cli.RunBuild(s.dir, nil, false, ui)
 		require.NoError(t, err)
 
 		// Should get two sessions (one per version) and two syncs
@@ -1436,7 +1293,7 @@ documents:
 		s := multiDocSetup(t, config, "")
 
 		ui, _ := testUI()
-		err := cli.RunBuild(s.dir, []string{"paper"}, false, false, ui)
+		err := cli.RunBuild(s.dir, []string{"paper"}, false, ui)
 		require.NoError(t, err)
 
 		// Only one document should be built
@@ -1455,7 +1312,7 @@ documents:
 		os.WriteFile(filepath.Join(dir, ".texops.yaml"), []byte(config), 0o600)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, []string{"nonexistent"}, false, false, ui)
+		err := cli.RunBuild(dir, []string{"nonexistent"}, false, ui)
 		require.Error(t, err)
 		assert.Contains(t, err.Error(), "unknown document")
 		assert.Contains(t, err.Error(), "nonexistent")
@@ -1473,7 +1330,7 @@ documents:
 		s := multiDocSetup(t, config, "slides.tex") // slides will fail
 
 		ui, buf := testUI()
-		err := cli.RunBuild(s.dir, nil, false, false, ui)
+		err := cli.RunBuild(s.dir, nil, false, ui)
 		require.Error(t, err)
 		assert.Contains(t, err.Error(), "one or more documents failed to build")
 
@@ -1499,7 +1356,7 @@ documents:
 		s := multiDocSetup(t, config, "")
 
 		ui, buf := testUI()
-		err := cli.RunBuild(s.dir, nil, false, false, ui)
+		err := cli.RunBuild(s.dir, nil, false, ui)
 		require.NoError(t, err)
 
 		output := buf.String()
@@ -1522,7 +1379,7 @@ documents:
 		os.WriteFile(filepath.Join(s.dir, "chapters", "paper", "paper.tex"), []byte(`\documentclass{article}\begin{document}Paper\end{document}`), 0o600)
 
 		ui, buf := testUI()
-		err := cli.RunBuild(s.dir, nil, false, false, ui)
+		err := cli.RunBuild(s.dir, nil, false, ui)
 		require.NoError(t, err)
 
 		assert.Len(t, *s.buildRequests, 2)
@@ -1623,7 +1480,7 @@ documents:
 		os.WriteFile(filepath.Join(dir, "paper.tex"), []byte(`\documentclass{article}\begin{document}Hello\end{document}`), 0o600)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.NoError(t, err)
 
 		assert.Equal(t, "xelatex", receivedCompiler, "compiler from config should be sent in build request")
@@ -1718,7 +1575,7 @@ documents:
 		os.WriteFile(filepath.Join(dir, "slides.tex"), []byte(`\documentclass{beamer}\begin{document}Slides\end{document}`), 0o600)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.NoError(t, err)
 
 		require.Len(t, receivedCompilers, 2)
@@ -1806,7 +1663,7 @@ documents:
 		os.WriteFile(filepath.Join(dir, "paper.tex"), []byte(`\documentclass{article}\begin{document}Hello\end{document}`), 0o600)
 
 		ui, _ := testUI()
-		err := cli.RunBuild(dir, nil, false, false, ui)
+		err := cli.RunBuild(dir, nil, false, ui)
 		require.NoError(t, err)
 
 		assert.Equal(t, "pdflatex", receivedCompiler, "default compiler should be pdflatex")
diff --git a/man/tx.1 b/man/tx.1
index bac4237..55e470d 100644
--- a/man/tx.1
+++ b/man/tx.1
@@ -15,7 +15,6 @@
 .Nm
 .Cm build
 .Op Fl -no-cache
-.Op Fl y | Fl -yes
 .Op Ar name ...
 .Nm
 .Cm status
@@ -128,10 +127,6 @@ Flags:
 .Bl -tag -width Ds
 .It Fl -no-cache
 Rebuild without using the remote build cache.
-.It Fl y , Fl -yes
-Skip the upload size confirmation prompt.
-This prompt is shown when the combined size of files to upload exceeds 50 MB.
-When stdout is not a TTY, confirmations default to yes.
 .El
 .Ss status
 Show authentication status including email
@@ -431,7 +426,7 @@ CI pipeline snippet
 .Pq assumes .texops.yaml No is committed :
 .Bd -literal -offset indent
 export TX_API_TOKEN="$TEXOPS_TOKEN"
-tx build --yes
+tx build
 .Ed
 .Pp
 Multi-document configuration and build:
diff --git a/man/tx.1.txt b/man/tx.1.txt
index 363e259..ff3a4d9 100644
--- a/man/tx.1.txt
+++ b/man/tx.1.txt
@@ -6,7 +6,7 @@ NAME
 SYNOPSIS
      tx login
      tx init [--texlive version] [--compiler name] [--main file]
-     tx build [--no-cache] [-y | --yes] [name ...]
+     tx build [--no-cache] [name ...]
      tx status
      tx token create [--name name] [--expires-in duration] [--no-expiry]
      tx token list
@@ -87,11 +87,6 @@ COMMANDS
      --no-cache
              Rebuild without using the remote build cache.
 
-     -y, --yes
-             Skip the upload size confirmation prompt.  This prompt is shown
-             when the combined size of files to upload exceeds 50 MB.  When
-             stdout is not a TTY, confirmations default to yes.
-
    status
      Show authentication status including email (when available),
      authentication method, and token expiry.  Always exits 0, even when not
@@ -295,7 +290,7 @@ EXAMPLES
      CI pipeline snippet (assumes .texops.yaml is committed):
 
            export TX_API_TOKEN="$TEXOPS_TOKEN"
-           tx build --yes
+           tx build
 
      Multi-document configuration and build: