diff --git a/pkg/cmd/fcs/iom/list.go b/pkg/cmd/fcs/iom/list.go
index a9d7fd3..71b6842 100644
--- a/pkg/cmd/fcs/iom/list.go
+++ b/pkg/cmd/fcs/iom/list.go
@@ -21,6 +21,7 @@
 package iom
 
 import (
+	"fmt"
 	"github.com/crowdstrike/falcon-cli/pkg/cmdutil"
 	"github.com/crowdstrike/falcon-cli/pkg/factory"
 	"github.com/crowdstrike/falcon-cli/pkg/output"
@@ -73,6 +74,11 @@ func NewCmdList(f *factory.Factory) *cobra.Command {
 }
 
 func runList(opts *listOptions) error {
+	const maxLimit = int64(100)
+	if opts.Limit > maxLimit {
+		return fmt.Errorf("--limit %d exceeds the maximum of %d for iom list", opts.Limit, maxLimit)
+	}
+
 	client, err := opts.Factory.FalconClient()
 	if err != nil {
 		return err
diff --git a/pkg/cmd/fcs/risks/list.go b/pkg/cmd/fcs/risks/list.go
index 13985af..b276265 100644
--- a/pkg/cmd/fcs/risks/list.go
+++ b/pkg/cmd/fcs/risks/list.go
@@ -54,11 +54,16 @@ func NewCmdList(f *factory.Factory) *cobra.Command {
             # List cloud risks
             falcon fcs risks list
 
-            # Filter by severity
-            falcon fcs risks list --filter "severity:'High'"
+            # Filter by severity (values: LOW, MEDIUM, HIGH, CRITICAL — uppercase)
+            falcon fcs risks list --filter "severity:'HIGH'"
+            falcon fcs risks list --filter "severity:'CRITICAL'"
 
-            # Sort and limit results
-            falcon fcs risks list --sort "severity.desc" --limit 50
+            # Filter by cloud provider — use --grep (the cloud_provider filter field is not reliable)
+            falcon fcs risks list --grep aws
+            falcon fcs risks list --output json | jq '[.[] | select(.provider == "aws")]'
+
+            # Sort descending (note: pipe separator, not dot)
+            falcon fcs risks list --sort "severity|desc" --limit 50
         `),
 		RunE: func(_ *cobra.Command, _ []string) error {
 			return runList(opts)
diff --git a/pkg/cmdutil/errors.go b/pkg/cmdutil/errors.go
index 726df2e..dec6628 100644
--- a/pkg/cmdutil/errors.go
+++ b/pkg/cmdutil/errors.go
@@ -101,11 +101,27 @@ var cwppOperations = map[string]bool{
 }
 
 // featureRequirements maps operations to features that must be tenant-provisioned.
+// Keys are the human-readable operation strings passed to HandleAPIError.
 var featureRequirements = map[string]string{
+	// Compliance posture — both the ID-discovery query and the posture summary fetch
+	// return 404 when the Compliance posture feature is not provisioned.
+	"query compliance frameworks":                "CSPM Compliance posture feature (contact your Falcon admin to enable)",
+	"get compliance framework posture summaries": "CSPM Compliance posture feature (contact your Falcon admin to enable)",
+	"query compliance controls":                  "CSPM Compliance posture feature (contact your Falcon admin to enable)",
+	"get compliance rule posture summaries":      "CSPM Compliance posture feature (contact your Falcon admin to enable)",
+	// Legacy gofalcon operation-name keys kept for backward compatibility.
 	"CloudComplianceFrameworkPostureSummaries": "CSPM Compliance posture feature (contact your Falcon admin to enable)",
 	"CloudComplianceRulePostureSummaries":      "CSPM Compliance posture feature (contact your Falcon admin to enable)",
 }
 
+// filterHints provides known filter field names for APIs whose 400 responses
+// do not include a machine-readable field list. Keyed by the operation string
+// passed to HandleAPIError.
+var filterHints = map[string]string{
+	"ContainerCombined": "cluster_name, namespace, cloud, container_id, " +
+		"privileged, running_as_root, allow_privilege_escalation, image_name",
+}
+
 // HandleAPIError wraps a gofalcon API error with an actionable message.
 // It inspects the HTTP status code via runtime.APIError and maps errors
 // to the specific API scope required or missing tenant features.
@@ -156,6 +172,9 @@ func HandleAPIError(err error, operation string) error {
 		return fmt.Errorf("%s: resource not found (HTTP 404)", operation)
 
 	case apiErr.Code == 400:
+		if hint, ok := filterHints[operation]; ok && strings.Contains(err.Error(), "{}") {
+			return fmt.Errorf("%s: invalid filter expression\n  Known filter fields: %s", operation, hint)
+		}
 		return fmt.Errorf("%s: bad request (HTTP 400) — %s", operation, FirstLine(err.Error()))
 
 	case apiErr.Code == 429: