diff --git a/cmd/audita/main.go b/cmd/audita/main.go
new file mode 100644
index 0000000..c299502
--- /dev/null
+++ b/cmd/audita/main.go
@@ -0,0 +1,11 @@
+package main
+
+import (
+	"os"
+
+	"gitea.maximumdirect.net/eric/audita/internal/cli"
+)
+
+func main() {
+	os.Exit(cli.Run(os.Args[1:], os.Stdout, os.Stderr))
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..e17d515
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module gitea.maximumdirect.net/eric/audita
+
+go 1.22
diff --git a/internal/cli/run.go b/internal/cli/run.go
new file mode 100644
index 0000000..07b5195
--- /dev/null
+++ b/internal/cli/run.go
@@ -0,0 +1,127 @@
+package cli
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"io"
+)
+
+const processNotImplementedMessage = "process command is not implemented yet"
+
+// Run executes the Audita CLI with the provided arguments and streams.
+func Run(args []string, stdout, stderr io.Writer) int {
+	if len(args) == 0 {
+		writeRootUsage(stdout)
+		return 0
+	}
+
+	if isHelpCommand(args) {
+		writeRootUsage(stdout)
+		return 0
+	}
+
+	if args[0] == "process" {
+		return runProcess(args[1:], stdout, stderr)
+	}
+
+	fmt.Fprintf(stderr, "audita: unknown command %q\n\n", args[0])
+	writeRootUsage(stderr)
+	return 2
+}
+
+func runProcess(args []string, stdout, stderr io.Writer) int {
+	if isHelpCommand(args) || hasHelpFlag(args) {
+		writeProcessUsage(stdout)
+		return 0
+	}
+
+	fs := flag.NewFlagSet("process", flag.ContinueOnError)
+	fs.SetOutput(stderr)
+
+	glossaryPath := fs.String("glossary", "", "Path to glossary YAML file")
+	outputPath := fs.String("output", "", "Path to corrected transcript JSON output file")
+	reportJSONPath := fs.String("report-json", "", "Path to machine-readable report JSON output file")
+	modules := fs.String("modules", "", "Comma-separated module sequence override")
+
+	_ = glossaryPath
+	_ = outputPath
+	_ = reportJSONPath
+	_ = modules
+
+	if err := fs.Parse(args); err != nil {
+		if errors.Is(err, flag.ErrHelp) {
+			writeProcessUsage(stdout)
+			return 0
+		}
+		return 2
+	}
+
+	remaining := fs.Args()
+	if len(remaining) != 1 {
+		fmt.Fprintln(stderr, "audita process: expected exactly 1 transcript JSON path argument")
+		fmt.Fprintln(stderr)
+		writeProcessUsage(stderr)
+		return 2
+	}
+
+	fmt.Fprintf(stderr, "audita process: %s\n", processNotImplementedMessage)
+	return 1
+}
+
+func isHelpCommand(args []string) bool {
+	if len(args) == 0 {
+		return false
+	}
+	if len(args) == 1 {
+		switch args[0] {
+		case "help", "-h", "--help":
+			return true
+		}
+	}
+	if len(args) == 2 && args[0] == "help" {
+		switch args[1] {
+		case "process":
+			return true
+		}
+	}
+	return false
+}
+
+func hasHelpFlag(args []string) bool {
+	for _, arg := range args {
+		if arg == "-h" || arg == "--help" {
+			return true
+		}
+	}
+	return false
+}
+
+func writeRootUsage(w io.Writer) {
+	fmt.Fprintln(w, "Audita is a transcript polishing CLI.")
+	fmt.Fprintln(w)
+	fmt.Fprintln(w, "Usage:")
+	fmt.Fprintln(w, "  audita <command> [options]")
+	fmt.Fprintln(w)
+	fmt.Fprintln(w, "Commands:")
+	fmt.Fprintln(w, "  process    Process a transcript JSON file")
+	fmt.Fprintln(w)
+	fmt.Fprintln(w, "Example:")
+	fmt.Fprintln(w, "  audita process transcript.json --glossary glossary.yaml --output corrected.json")
+}
+
+func writeProcessUsage(w io.Writer) {
+	fmt.Fprintln(w, "Process a transcript JSON file.")
+	fmt.Fprintln(w)
+	fmt.Fprintln(w, "Usage:")
+	fmt.Fprintln(w, "  audita process <transcript.json> [flags]")
+	fmt.Fprintln(w)
+	fmt.Fprintln(w, "Flags:")
+	fmt.Fprintln(w, "  --glossary <path>     Path to glossary YAML file")
+	fmt.Fprintln(w, "  --output <path>       Path to corrected transcript JSON output file")
+	fmt.Fprintln(w, "  --report-json <path>  Path to machine-readable report JSON output file")
+	fmt.Fprintln(w, "  --modules <list>      Comma-separated module sequence override")
+	fmt.Fprintln(w)
+	fmt.Fprintln(w, "Example:")
+	fmt.Fprintln(w, "  audita process transcript.json --glossary glossary.yaml --output corrected.json")
+}
diff --git a/internal/cli/run_test.go b/internal/cli/run_test.go
new file mode 100644
index 0000000..eb8ea57
--- /dev/null
+++ b/internal/cli/run_test.go
@@ -0,0 +1,77 @@
+package cli
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestRunRootHelp(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	exitCode := Run([]string{"--help"}, &stdout, &stderr)
+	if exitCode != 0 {
+		t.Fatalf("expected exit code 0, got %d", exitCode)
+	}
+	if !strings.Contains(stdout.String(), "audita <command> [options]") {
+		t.Fatalf("expected root usage in stdout, got %q", stdout.String())
+	}
+	if !strings.Contains(stdout.String(), "process") {
+		t.Fatalf("expected process command in root help, got %q", stdout.String())
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("expected empty stderr, got %q", stderr.String())
+	}
+}
+
+func TestRunProcessHelp(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	exitCode := Run([]string{"process", "--help"}, &stdout, &stderr)
+	if exitCode != 0 {
+		t.Fatalf("expected exit code 0, got %d", exitCode)
+	}
+	if !strings.Contains(stdout.String(), "audita process <transcript.json> [flags]") {
+		t.Fatalf("expected process usage in stdout, got %q", stdout.String())
+	}
+	if !strings.Contains(stdout.String(), "--glossary") {
+		t.Fatalf("expected glossary flag in process help, got %q", stdout.String())
+	}
+	if stderr.Len() != 0 {
+		t.Fatalf("expected empty stderr, got %q", stderr.String())
+	}
+}
+
+func TestRunUnknownCommand(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	exitCode := Run([]string{"unknown"}, &stdout, &stderr)
+	if exitCode != 2 {
+		t.Fatalf("expected exit code 2, got %d", exitCode)
+	}
+	if stdout.Len() != 0 {
+		t.Fatalf("expected empty stdout, got %q", stdout.String())
+	}
+	if !strings.Contains(stderr.String(), "unknown command") {
+		t.Fatalf("expected unknown command error in stderr, got %q", stderr.String())
+	}
+}
+
+func TestRunProcessNotImplemented(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	exitCode := Run([]string{"process", "transcript.json"}, &stdout, &stderr)
+	if exitCode == 0 {
+		t.Fatalf("expected nonzero exit code for not-implemented process")
+	}
+	if stdout.Len() != 0 {
+		t.Fatalf("expected empty stdout, got %q", stdout.String())
+	}
+	if !strings.Contains(stderr.String(), processNotImplementedMessage) {
+		t.Fatalf("expected not-implemented message in stderr, got %q", stderr.String())
+	}
+}