diff --git a/frontend/src/features/parsing-filters/components/VisualFilterEditor.tsx b/frontend/src/features/parsing-filters/components/VisualFilterEditor.tsx
index 06fa8cf84..ea6a569be 100644
--- a/frontend/src/features/parsing-filters/components/VisualFilterEditor.tsx
+++ b/frontend/src/features/parsing-filters/components/VisualFilterEditor.tsx
@@ -285,10 +285,20 @@ function StepFields({
   onPatternCreated?: (p: RegexPattern) => void
   onChange: (config: Record<string, unknown>) => void
 }) {
+  const { t } = useTranslation()
   const set = (key: string, val: unknown) => onChange({ ...config, [key]: val })
   const str = (key: string) => (typeof config[key] === 'string' ? (config[key] as string) : '')
   const list = (key: string) =>
     Array.isArray(config[key]) ? (config[key] as unknown[]).map((x) => String(x)) : []
+  const obj = (key: string): Record<string, unknown> =>
+    config[key] && typeof config[key] === 'object' && !Array.isArray(config[key])
+      ? (config[key] as Record<string, unknown>)
+      : {}
+  const objStr = (key: string, sub: string) => {
+    const v = obj(key)[sub]
+    return typeof v === 'string' ? v : ''
+  }
+  const setObj = (key: string, sub: string, val: string) => set(key, { ...obj(key), [sub]: val })
 
   switch (kind) {
     case 'grok':
@@ -335,7 +345,13 @@ function StepFields({
       return (
         <>
           <TextField label="function" required value={str('function')} readOnly={readOnly} onChange={(v) => set('function', v)} />
-          <ListField label="params" values={list('params')} readOnly={readOnly} onChange={(v) => set('params', v)} />
+          <div className="space-y-1.5 rounded-md border border-border/60 bg-background/30 p-2">
+            <div className="font-mono text-[11px] text-foreground/70">{t('parsingFilters.visual.parameters')}</div>
+            <div className="grid grid-cols-2 gap-3">
+              <TextField label={t('parsingFilters.visual.paramsKey')} required value={objStr('params', 'key')} readOnly={readOnly} onChange={(v) => setObj('params', 'key', v)} />
+              <TextField label={t('parsingFilters.visual.paramsValue')} required value={objStr('params', 'value')} readOnly={readOnly} onChange={(v) => setObj('params', 'value', v)} />
+            </div>
+          </div>
           <WhereField value={str('where')} readOnly={readOnly} onChange={(v) => set('where', v)} />
         </>
       )
@@ -399,7 +415,7 @@ function WhereField({
   )
 }
 
-/** Editable list of strings (rename.from, add.params). */
+/** Editable list of strings (rename.from). */
 function ListField({
   label,
   values,
diff --git a/frontend/src/features/parsing-filters/lib/filter-model.ts b/frontend/src/features/parsing-filters/lib/filter-model.ts
index be7a49a8d..0d87daa6e 100644
--- a/frontend/src/features/parsing-filters/lib/filter-model.ts
+++ b/frontend/src/features/parsing-filters/lib/filter-model.ts
@@ -121,6 +121,7 @@ function pruneEmpty(config: Record<string, unknown>): Record<string, unknown> {
     if (v == null) continue
     if (typeof v === 'string' && v.trim() === '') continue
     if (Array.isArray(v) && v.length === 0) continue
+    if (isRecord(v) && Object.keys(v).length === 0) continue
     out[k] = v
   }
   return out
@@ -137,7 +138,7 @@ export function emptyStep(kind: StepKind): Step {
     case 'rename':
       return { kind, config: { to: '', from: [] } }
     case 'add':
-      return { kind, config: { function: '', params: [] } }
+      return { kind, config: { function: 'string', params: {} } }
     case 'drop':
       return { kind, config: {} }
     default:
diff --git a/frontend/src/shared/i18n/locales/de.json b/frontend/src/shared/i18n/locales/de.json
index ab072ba04..ccf637e4f 100644
--- a/frontend/src/shared/i18n/locales/de.json
+++ b/frontend/src/shared/i18n/locales/de.json
@@ -4455,7 +4455,10 @@
       "patternCreated": "Muster „{{name}}“ erstellt",
       "patternCreateError": "Muster konnte nicht erstellt werden",
       "patternIdInvalid": "Die Muster-ID muss mit einem Buchstaben oder _ beginnen und nur Buchstaben, Ziffern oder _ verwenden",
-      "patternDefRequired": "Definition ist erforderlich"
+      "patternDefRequired": "Definition ist erforderlich",
+      "parameters": "Parameter",
+      "paramsKey": "Schlüssel",
+      "paramsValue": "Wert"
     },
     "allDataTypes": "Alle Datentypen"
   },
diff --git a/frontend/src/shared/i18n/locales/en.json b/frontend/src/shared/i18n/locales/en.json
index 907ba36bf..b06b3e675 100644
--- a/frontend/src/shared/i18n/locales/en.json
+++ b/frontend/src/shared/i18n/locales/en.json
@@ -4415,7 +4415,10 @@
       "patternCreated": "Pattern \"{{name}}\" created",
       "patternCreateError": "Failed to create pattern",
       "patternIdInvalid": "Pattern ID must start with a letter or _ and use only letters, digits or _",
-      "patternDefRequired": "Definition is required"
+      "patternDefRequired": "Definition is required",
+      "parameters": "Parameters",
+      "paramsKey": "Key",
+      "paramsValue": "Value"
     },
     "allDataTypes": "All data types"
   },
diff --git a/frontend/src/shared/i18n/locales/es.json b/frontend/src/shared/i18n/locales/es.json
index 54345a314..ed8ed0dc4 100644
--- a/frontend/src/shared/i18n/locales/es.json
+++ b/frontend/src/shared/i18n/locales/es.json
@@ -4339,7 +4339,10 @@
       "patternCreated": "Patrón \"{{name}}\" creado",
       "patternCreateError": "No se pudo crear el patrón",
       "patternIdInvalid": "El ID debe empezar con letra o _ y usar solo letras, dígitos o _",
-      "patternDefRequired": "La definición es obligatoria"
+      "patternDefRequired": "La definición es obligatoria",
+      "parameters": "Parámetros",
+      "paramsKey": "Clave",
+      "paramsValue": "Valor"
     },
     "allDataTypes": "Todos los tipos de dato"
   },
diff --git a/frontend/src/shared/i18n/locales/fr.json b/frontend/src/shared/i18n/locales/fr.json
index 78ed500ac..cc3c47e1c 100644
--- a/frontend/src/shared/i18n/locales/fr.json
+++ b/frontend/src/shared/i18n/locales/fr.json
@@ -4455,7 +4455,10 @@
       "patternCreated": "Motif « {{name}} » créé",
       "patternCreateError": "Échec de la création du motif",
       "patternIdInvalid": "L'ID du motif doit commencer par une lettre ou _ et n'utiliser que des lettres, chiffres ou _",
-      "patternDefRequired": "La définition est requise"
+      "patternDefRequired": "La définition est requise",
+      "parameters": "Paramètres",
+      "paramsKey": "Clé",
+      "paramsValue": "Valeur"
     },
     "allDataTypes": "Tous les types de données"
   },
diff --git a/frontend/src/shared/i18n/locales/it.json b/frontend/src/shared/i18n/locales/it.json
index e154f2591..501a6ff91 100644
--- a/frontend/src/shared/i18n/locales/it.json
+++ b/frontend/src/shared/i18n/locales/it.json
@@ -4455,7 +4455,10 @@
       "patternCreated": "Pattern \"{{name}}\" creato",
       "patternCreateError": "Creazione del pattern non riuscita",
       "patternIdInvalid": "L'ID del pattern deve iniziare con una lettera o _ e usare solo lettere, cifre o _",
-      "patternDefRequired": "La definizione è obbligatoria"
+      "patternDefRequired": "La definizione è obbligatoria",
+      "parameters": "Parametri",
+      "paramsKey": "Chiave",
+      "paramsValue": "Valore"
     },
     "allDataTypes": "Tutti i tipi di dati"
   },
diff --git a/frontend/src/shared/i18n/locales/pt.json b/frontend/src/shared/i18n/locales/pt.json
index 9d74d6531..cdfe86170 100644
--- a/frontend/src/shared/i18n/locales/pt.json
+++ b/frontend/src/shared/i18n/locales/pt.json
@@ -4339,7 +4339,10 @@
       "patternCreated": "Padrão \"{{name}}\" criado",
       "patternCreateError": "Falha ao criar o padrão",
       "patternIdInvalid": "O ID deve começar com letra ou _ e usar apenas letras, dígitos ou _",
-      "patternDefRequired": "A definição é obrigatória"
+      "patternDefRequired": "A definição é obrigatória",
+      "parameters": "Parâmetros",
+      "paramsKey": "Chave",
+      "paramsValue": "Valor"
     },
     "allDataTypes": "Todos os tipos de dado"
   },
diff --git a/frontend/src/shared/i18n/locales/ru.json b/frontend/src/shared/i18n/locales/ru.json
index a7788d675..86f4e709e 100644
--- a/frontend/src/shared/i18n/locales/ru.json
+++ b/frontend/src/shared/i18n/locales/ru.json
@@ -4265,7 +4265,10 @@
       "patternCreated": "Шаблон «{{name}}» создан",
       "patternCreateError": "Не удалось создать шаблон",
       "patternIdInvalid": "ID шаблона должен начинаться с буквы или _ и содержать только буквы, цифры или _",
-      "patternDefRequired": "Определение обязательно"
+      "patternDefRequired": "Определение обязательно",
+      "parameters": "Параметры",
+      "paramsKey": "Ключ",
+      "paramsValue": "Значение"
     },
     "allDataTypes": "Все типы данных"
   },