diff --git a/internal/daemon/controller/handler_ui.go b/internal/daemon/controller/handler_ui.go
index 40b8b63b5c..bc0fcf4d54 100644
--- a/internal/daemon/controller/handler_ui.go
+++ b/internal/daemon/controller/handler_ui.go
@@ -10,6 +10,8 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/hashicorp/boundary/internal/event"
+	"github.com/hashicorp/boundary/internal/perms"
 	"github.com/hashicorp/boundary/internal/ui"
 )
 
@@ -20,6 +22,19 @@ func init() {
 // serveMetadata provides controller metadata to the UI for licensed versions of Boundary.
 var serveMetadata = func(ctx context.Context, w http.ResponseWriter) {}
 
+// serveGrantSchema provides the grant schema to the UI for autocomplete and linting support.
+var serveGrantSchema = func(ctx context.Context, w http.ResponseWriter) {
+	const op = "controller.serveGrantSchema"
+	data, err := perms.BuildGrantSchemaJSON(ctx)
+	if err != nil {
+		w.WriteHeader(http.StatusNoContent)
+		event.WriteError(ctx, op, err)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(data)
+}
+
 func handleUiWithAssets(c *Controller) http.Handler {
 	var nextHandler http.Handler
 	if c.conf.RawConfig.DevUiPassthroughDir != "" {
@@ -46,6 +61,9 @@ func handleUiWithAssets(c *Controller) http.Handler {
 			case "/metadata.json":
 				serveMetadata(c.baseContext, w)
 				return
+			case "/grants-schema.json":
+				serveGrantSchema(c.baseContext, w)
+				return
 			default:
 				for i := dotIndex + 1; i < len(r.URL.Path); i++ {
 					intVal := r.URL.Path[i]
diff --git a/internal/perms/grants_schema.go b/internal/perms/grants_schema.go
new file mode 100644
index 0000000000..a644c5efc2
--- /dev/null
+++ b/internal/perms/grants_schema.go
@@ -0,0 +1,119 @@
+// Copyright IBM Corp. 2020, 2025
+// SPDX-License-Identifier: BUSL-1.1
+
+package perms
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/hashicorp/boundary/globals"
+	"github.com/hashicorp/boundary/internal/types/action"
+	"github.com/hashicorp/boundary/internal/types/resource"
+	"github.com/hashicorp/boundary/internal/types/scope"
+)
+
+// GrantSchema represents the schema of grants in the system,
+// including the resource types and their associated actions, scopes.
+type GrantSchema struct {
+	ResourceTypes []ResourceTypeSchema `json:"resource_types"`
+}
+
+type ResourceTypeSchema struct {
+	// Type is the string representation of the resource type
+	Type string `json:"type"`
+
+	// The collection actions that are valid for this resource type
+	CollectionActions []string `json:"collection_actions,omitempty"`
+
+	// The id actions that are valid for this resource type
+	IdActions []string `json:"id_actions,omitempty"`
+
+	// The scopes that are valid for this resource type
+	Scopes []string `json:"scopes,omitempty"`
+
+	// The ID prefixes that are valid for this resource type
+	IdPrefixes []string `json:"id_prefixes,omitempty"`
+
+	// The parent resource type, if any, omitted if no parent
+	ParentType string `json:"parent_type,omitempty"`
+}
+
+// BuildGrantSchema constructs the full grant schema from the registered
+// resource types, actions, and scope definitions.
+func BuildGrantSchema(ctx context.Context) (*GrantSchema, error) {
+	const op = "perms.BuildGrantSchema"
+	schema := &GrantSchema{}
+
+	for name, typ := range resource.Map {
+		// Skip resource types that aren't real grantable resources
+		// These types will fail further lookups and aren't useful to include in the schema
+		if typ == resource.Unknown || typ == resource.All || typ == resource.Controller {
+			continue
+		}
+
+		// Collect all collection actions
+		colActions, err := action.CollectionActionSetForResource(typ)
+		if err != nil {
+			return nil, fmt.Errorf("%s: error getting collection actions for %q: %w", op, name, err)
+		}
+
+		var colStrs []string
+		for a := range colActions {
+			colStrs = append(colStrs, a.String())
+		}
+
+		// Collect all id actions
+		idActions, err := action.IdActionSetForResource(typ)
+		if err != nil {
+			return nil, fmt.Errorf("%s: error getting id actions for %q: %w", op, name, err)
+		}
+
+		var idStrs []string
+		for a := range idActions {
+			if a == action.NoOp {
+				continue
+			}
+			idStrs = append(idStrs, a.String())
+		}
+
+		// Collect all scopes that can be applied to this resource type
+		scopes, err := scope.AllowedIn(ctx, typ)
+		if err != nil {
+			return nil, fmt.Errorf("%s: error getting allowed scopes for %q: %w", op, name, err)
+		}
+
+		var scopeStrs []string
+		for _, s := range scopes {
+			scopeStrs = append(scopeStrs, s.String())
+		}
+
+		// Parent type is the resource's parent if one exists,
+		// otherwise this will be an empty string.
+		var parentType string
+		if parent := typ.Parent(); parent != typ {
+			parentType = parent.String()
+		}
+
+		schema.ResourceTypes = append(schema.ResourceTypes, ResourceTypeSchema{
+			Type:              name,
+			CollectionActions: colStrs,
+			IdActions:         idStrs,
+			Scopes:            scopeStrs,
+			IdPrefixes:        globals.ResourcePrefixesFromType(typ),
+			ParentType:        parentType,
+		})
+	}
+
+	return schema, nil
+}
+
+// BuildGrantSchemaJSON builds the grant schema and marshals it to JSON
+func BuildGrantSchemaJSON(ctx context.Context) ([]byte, error) {
+	schema, err := BuildGrantSchema(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return json.Marshal(schema)
+}
diff --git a/internal/perms/grants_schema_test.go b/internal/perms/grants_schema_test.go
new file mode 100644
index 0000000000..a5d277a10f
--- /dev/null
+++ b/internal/perms/grants_schema_test.go
@@ -0,0 +1,51 @@
+// Copyright IBM Corp. 2020, 2025
+// SPDX-License-Identifier: BUSL-1.1
+
+package perms_test
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+
+	"github.com/hashicorp/boundary/internal/perms"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	// Import to trigger init() registrations in all service handlers
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/accounts"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/aliases"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/authmethods"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/authtokens"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/billing"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/credentiallibraries"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/credentials"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/credentialstores"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/groups"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/host_catalogs"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/host_sets"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/hosts"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/managed_groups"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/policies"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/roles"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/scopes"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/session_recordings"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/sessions"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/storage_buckets"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/targets"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/users"
+	_ "github.com/hashicorp/boundary/internal/daemon/controller/handlers/workers"
+)
+
+func TestBuildGrantSchema(t *testing.T) {
+	ctx := context.Background()
+	schema, err := perms.BuildGrantSchema(ctx)
+	require.NoError(t, err)
+	require.NotNil(t, schema)
+	assert.NotEmpty(t, schema.ResourceTypes, "resource types should not be empty")
+
+	// JSON serialization should produce valid JSON
+	data, err := perms.BuildGrantSchemaJSON(ctx)
+	require.NoError(t, err)
+	assert.True(t, json.Valid(data), "output should be valid JSON")
+}