Add reasoning effort to usage events

sdk/cliproxy/usage/manager.go

@@ -12,19 +12,21 @@ import (
 
 // Record contains the usage statistics captured for a single provider request.
 type Record struct {
-	Provider    string
-	Model       string
-	Alias       string
-	APIKey      string
-	AuthID      string
-	AuthIndex   string
-	AuthType    string
-	Source      string
-	RequestedAt time.Time
-	Latency     time.Duration
-	Failed      bool
-	Fail        Failure
-	Detail      Detail
+	Provider  string
+	Model     string
+	Alias     string
+	APIKey    string
+	AuthID    string
+	AuthIndex string
+	AuthType  string
+	Source    string
+	// ReasoningEffort stores the client-requested thinking level for request event logs.
+	ReasoningEffort string
+	RequestedAt     time.Time
+	Latency         time.Duration
+	Failed          bool
+	Fail            Failure
+	Detail          Detail
 	// ResponseHeaders stores a snapshot of upstream response headers for usage sinks.
 	ResponseHeaders http.Header
 }
@@ -47,6 +49,7 @@ type Detail struct {
 }
 
 type requestedModelAliasContextKey struct{}
+type reasoningEffortContextKey struct{}
 
 // WithRequestedModelAlias stores the client-requested model name for usage sinks.
 func WithRequestedModelAlias(ctx context.Context, alias string) context.Context {
@@ -76,6 +79,34 @@ func RequestedModelAliasFromContext(ctx context.Context) string {
 	}
 }
 
+// WithReasoningEffort stores the client-requested reasoning effort for usage sinks.
+func WithReasoningEffort(ctx context.Context, effort string) context.Context {
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	effort = strings.TrimSpace(effort)
+	if effort == "" {
+		return ctx
+	}
+	return context.WithValue(ctx, reasoningEffortContextKey{}, effort)
+}
+
+// ReasoningEffortFromContext returns the client-requested reasoning effort stored in ctx.
+func ReasoningEffortFromContext(ctx context.Context) string {
+	if ctx == nil {
+		return ""
+	}
+	raw := ctx.Value(reasoningEffortContextKey{})
+	switch value := raw.(type) {
+	case string:
+		return strings.TrimSpace(value)
+	case []byte:
+		return strings.TrimSpace(string(value))
+	default:
+		return ""
+	}
+}
+
 // Plugin consumes usage records emitted by the proxy runtime.
 type Plugin interface {
 	HandleUsage(ctx context.Context, record Record)