feat: add --tools flag to filter exposed MCP tools (#167)

Adds `-O`/`-tools` CLI flag and `GITEA_TOOLS` environment variable
accepting a comma-separated list of tool names. When set, only the
listed tools are exposed to MCP clients, which lets AI agents trim
their tool context. Composes with `--read-only`. Unknown names are
logged at startup so typos surface instead of failing silently.

Co-Authored-By: silverwind <me@silverwind.io>
Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>

pkg/tool/tool_test.go

@@ -0,0 +1,100 @@
+package tool
+
+import (
+	"slices"
+	"testing"
+
+	"gitea.com/gitea/gitea-mcp/pkg/flag"
+
+	"github.com/mark3labs/mcp-go/mcp"
+	"github.com/mark3labs/mcp-go/server"
+)
+
+func makeTool(name string) server.ServerTool {
+	return server.ServerTool{Tool: mcp.NewTool(name)}
+}
+
+func names(sts []server.ServerTool) []string {
+	out := make([]string, len(sts))
+	for i, st := range sts {
+		out[i] = st.Tool.Name
+	}
+	return out
+}
+
+func TestTools(t *testing.T) {
+	tests := []struct {
+		name     string
+		readOnly bool
+		allowed  map[string]struct{}
+		read     []string
+		write    []string
+		want     []string
+	}{
+		{
+			name:  "no filters returns write then read",
+			read:  []string{"r1", "r2"},
+			write: []string{"w1", "w2"},
+			want:  []string{"w1", "w2", "r1", "r2"},
+		},
+		{
+			name:     "read-only excludes write",
+			readOnly: true,
+			read:     []string{"r1", "r2"},
+			write:    []string{"w1"},
+			want:     []string{"r1", "r2"},
+		},
+		{
+			name:    "allowlist keeps only listed",
+			allowed: map[string]struct{}{"r1": {}, "w1": {}},
+			read:    []string{"r1", "r2"},
+			write:   []string{"w1", "w2"},
+			want:    []string{"w1", "r1"},
+		},
+		{
+			name:     "allowlist intersected with read-only drops write entries",
+			readOnly: true,
+			allowed:  map[string]struct{}{"r1": {}, "w1": {}},
+			read:     []string{"r1", "r2"},
+			write:    []string{"w1", "w2"},
+			want:     []string{"r1"},
+		},
+		{
+			name:    "allowlist with only unknown names returns empty",
+			allowed: map[string]struct{}{"unknown": {}},
+			read:    []string{"r1"},
+			write:   []string{"w1"},
+			want:    []string{},
+		},
+		{
+			name:    "empty allowlist map passes through",
+			allowed: map[string]struct{}{},
+			read:    []string{"r1"},
+			write:   []string{"w1"},
+			want:    []string{"w1", "r1"},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			origRO, origAllow := flag.ReadOnly, flag.AllowedTools
+			t.Cleanup(func() {
+				flag.ReadOnly, flag.AllowedTools = origRO, origAllow
+			})
+			flag.ReadOnly = tt.readOnly
+			flag.AllowedTools = tt.allowed
+
+			tr := New()
+			for _, n := range tt.read {
+				tr.RegisterRead(makeTool(n))
+			}
+			for _, n := range tt.write {
+				tr.RegisterWrite(makeTool(n))
+			}
+
+			got := names(tr.Tools())
+			if !slices.Equal(got, tt.want) {
+				t.Errorf("Tools() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}