diff --git a/.changeset/keyvalue-node-config-schemas.md b/.changeset/keyvalue-node-config-schemas.md
new file mode 100644
index 0000000000..207d432c85
--- /dev/null
+++ b/.changeset/keyvalue-node-config-schemas.md
@@ -0,0 +1,26 @@
+---
+"@objectstack/service-automation": patch
+---
+
+feat(automation): publish configSchemas for the keyValue-capable nodes (flow designer parity, #3304)
+
+The `assignment`, `create_record` / `update_record` / `delete_record` /
+`get_record`, and `screen` nodes shipped no `configSchema`, so the flow designer
+had no server-driven form for them. Each descriptor now carries one that mirrors
+the objectui hardcoded field group field-for-field: object references as `xRef`,
+the screen repeater's `visibleWhen` as `xExpression: 'expression'`, and the
+free-form maps (`fields` / `filter` / `assignments` / `defaults`) as JSON-Schema
+open objects (`additionalProperties: true`, no fixed `properties`) — the shape
+the designer's schema adapter renders with its flat keyValue editor. Values stay
+fully permissive because real metadata carries operator objects (`{"$ne": null}`),
+`{var}` templates, and non-string literals.
+
+Deliberately still schemaless (no online/offline divergence exists for a node
+with no configSchema, and a partial schema would drop editors): `decision`
+(virtual Target column derived from edges), `wait` (top-level `waitEventConfig`),
+`script` (actionType-conditional form), `subflow` (top-level `timeoutMs`).
+
+Additive and backward-compatible: descriptor metadata only, no runtime behavior
+change. Requires an objectui with the keyValue schema mapping (objectui #2708)
+for the maps to render as structured editors; older designers keep their
+hardcoded forms.
diff --git a/packages/services/service-automation/src/builtin/config-schemas.test.ts b/packages/services/service-automation/src/builtin/config-schemas.test.ts
new file mode 100644
index 0000000000..b8a9cbb163
--- /dev/null
+++ b/packages/services/service-automation/src/builtin/config-schemas.test.ts
@@ -0,0 +1,110 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * Designer-parity configSchemas (#3304 — descriptor counterpart to objectui
+ * #2670 Phase 3). The keyValue-capable nodes now publish a `configSchema` that
+ * mirrors objectui's hardcoded field group, so the online (schema-driven) form
+ * matches the offline one. The load-bearing shape is the free-form map —
+ * `type: 'object'` + `additionalProperties: true` and NO fixed `properties` —
+ * which the designer renders with its flat keyValue editor; `true`-permissive
+ * because real metadata carries operator objects (`{"$ne": null}`), `{var}`
+ * templates, and non-string literals as values.
+ *
+ * Deliberately schemaless (stay on the hardcoded designer form; a node with no
+ * configSchema has NO online/offline divergence): `decision` (virtual Target
+ * column derived from edges), `wait` (top-level `waitEventConfig` block),
+ * `script` (actionType-conditional form) and `subflow` (top-level `timeoutMs`)
+ * — a partial schema would drop those editors.
+ */
+
+import { describe, it, expect } from 'vitest';
+import { AutomationEngine } from '../engine.js';
+import { registerCrudNodes } from './crud-nodes.js';
+import { registerLogicNodes } from './logic-nodes.js';
+import { registerScreenNodes } from './screen-nodes.js';
+
+function silentLogger() {
+  return { info() {}, warn() {}, error() {}, debug() {}, child() { return silentLogger(); } } as any;
+}
+function ctx() {
+  return { logger: silentLogger(), getService() { throw new Error('none'); } } as any;
+}
+
+interface SchemaProp {
+  type?: string;
+  format?: string;
+  properties?: Record<string, SchemaProp>;
+  additionalProperties?: unknown;
+  items?: SchemaProp;
+  enum?: unknown[];
+  xRef?: { kind?: string };
+  xExpression?: string;
+}
+
+function schemaOf(engine: AutomationEngine, type: string) {
+  const schema = engine.getActionDescriptor(type)?.configSchema as
+    | { properties?: Record<string, SchemaProp>; required?: string[] }
+    | undefined;
+  expect(schema, `${type} should publish a configSchema`).toBeDefined();
+  return schema!;
+}
+
+/** The keyValue contract: an open map with a value schema and no fixed props. */
+function expectKeyValueMap(prop: SchemaProp | undefined, label: string) {
+  expect(prop, label).toBeDefined();
+  expect(prop!.type).toBe('object');
+  expect(prop!.additionalProperties).toBe(true);
+  expect(prop!.properties).toBeUndefined();
+}
+
+describe('builtin node configSchemas — designer parity (#3304)', () => {
+  const engine = new AutomationEngine(silentLogger());
+  registerCrudNodes(engine, ctx());
+  registerLogicNodes(engine, ctx());
+  registerScreenNodes(engine, ctx());
+
+  it('CRUD quartet: object reference + keyValue maps, objectName required', () => {
+    const get = schemaOf(engine, 'get_record');
+    expect(get.properties?.objectName?.xRef?.kind).toBe('object');
+    expectKeyValueMap(get.properties?.filter, 'get_record.filter');
+    expect(get.properties?.limit?.type).toBe('integer');
+    expect(get.required).toEqual(['objectName']);
+
+    const create = schemaOf(engine, 'create_record');
+    expect(create.properties?.objectName?.xRef?.kind).toBe('object');
+    expectKeyValueMap(create.properties?.fields, 'create_record.fields');
+
+    const update = schemaOf(engine, 'update_record');
+    expectKeyValueMap(update.properties?.filter, 'update_record.filter');
+    expectKeyValueMap(update.properties?.fields, 'update_record.fields');
+
+    const del = schemaOf(engine, 'delete_record');
+    expectKeyValueMap(del.properties?.filter, 'delete_record.filter');
+  });
+
+  it('assignment: a single free-form assignments map, nothing required', () => {
+    const schema = schemaOf(engine, 'assignment');
+    expectKeyValueMap(schema.properties?.assignments, 'assignment.assignments');
+    expect(schema.required).toBeUndefined();
+  });
+
+  it('screen: field list with a CEL visibleWhen column, object-form refs, defaults map', () => {
+    const schema = schemaOf(engine, 'screen');
+    // The repeater's visibleWhen column is bare CEL → expression column.
+    expect(schema.properties?.fields?.items?.properties?.visibleWhen?.xExpression).toBe('expression');
+    expect(schema.properties?.fields?.items?.properties?.required?.type).toBe('boolean');
+    expect(schema.properties?.objectName?.xRef?.kind).toBe('object');
+    expect(schema.properties?.mode?.enum).toEqual(['create', 'edit']);
+    expect(schema.properties?.description?.format).toBe('multiline');
+    expectKeyValueMap(schema.properties?.defaults, 'screen.defaults');
+  });
+
+  it('decision / script stay deliberately schemaless (no partial forms)', () => {
+    // A node with no configSchema renders identically online and offline (the
+    // hardcoded fallback), so there is no divergence — and publishing a partial
+    // schema would DROP editors the adapter cannot express (decision's virtual
+    // Target column; script's actionType-conditional fields).
+    expect(engine.getActionDescriptor('decision')?.configSchema).toBeUndefined();
+    expect(engine.getActionDescriptor('script')?.configSchema).toBeUndefined();
+  });
+});
diff --git a/packages/services/service-automation/src/builtin/crud-nodes.ts b/packages/services/service-automation/src/builtin/crud-nodes.ts
index 4dbcb1e605..bf2f0fdcb5 100644
--- a/packages/services/service-automation/src/builtin/crud-nodes.ts
+++ b/packages/services/service-automation/src/builtin/crud-nodes.ts
@@ -41,6 +41,22 @@ export function registerCrudNodes(engine: AutomationEngine, ctx: PluginContext):
                 type: 'get_record', version: '1.0.0', name: 'Get Records',
                 description: 'Query records from an object.',
                 icon: 'search', category: 'data', source: 'builtin',
+                // Structured designer form (ADR-0018, #3304) — mirrors objectui's
+                // hardcoded `get_record` field group. `filter` is a free-form
+                // string-keyed map (JSON-Schema `additionalProperties`), which the
+                // designer renders with its flat keyValue editor; values stay
+                // `true`-permissive because real metadata carries operator objects
+                // (e.g. `{"$ne": null}`) alongside `{var}` templates and literals.
+                configSchema: {
+                    type: 'object',
+                    properties: {
+                        objectName: { type: 'string', title: 'Object', xRef: { kind: 'object' } },
+                        filter: { type: 'object', additionalProperties: true, title: 'Filter', description: 'Field/value pairs to match (e.g. status → active). Operator values like {"$ne": null} are preserved.' },
+                        limit: { type: 'integer', title: 'Limit' },
+                        outputVariable: { type: 'string', title: 'Output variable' },
+                    },
+                    required: ['objectName'],
+                },
             }),
             async execute(node, variables, context) {
                 const cfg = (node.config ?? {}) as Record<string, unknown>;
@@ -86,6 +102,17 @@ export function registerCrudNodes(engine: AutomationEngine, ctx: PluginContext):
                 type: 'create_record', version: '1.0.0', name: 'Create Record',
                 description: 'Insert a new record into an object.',
                 icon: 'plus-circle', category: 'data', source: 'builtin',
+                // Designer form (ADR-0018, #3304) — see get_record for the
+                // keyValue-map rationale.
+                configSchema: {
+                    type: 'object',
+                    properties: {
+                        objectName: { type: 'string', title: 'Object', xRef: { kind: 'object' } },
+                        fields: { type: 'object', additionalProperties: true, title: 'Field values', description: 'Field values to write on the new record.' },
+                        outputVariable: { type: 'string', title: 'Output variable' },
+                    },
+                    required: ['objectName'],
+                },
             }),
             async execute(node, variables, context) {
                 const cfg = (node.config ?? {}) as Record<string, unknown>;
@@ -135,6 +162,17 @@ export function registerCrudNodes(engine: AutomationEngine, ctx: PluginContext):
                 type: 'update_record', version: '1.0.0', name: 'Update Records',
                 description: 'Update records matching a filter.',
                 icon: 'edit', category: 'data', source: 'builtin',
+                // Designer form (ADR-0018, #3304) — see get_record for the
+                // keyValue-map rationale.
+                configSchema: {
+                    type: 'object',
+                    properties: {
+                        objectName: { type: 'string', title: 'Object', xRef: { kind: 'object' } },
+                        filter: { type: 'object', additionalProperties: true, title: 'Filter', description: 'Field/value pairs identifying the record(s) to update (e.g. id → {recordId}).' },
+                        fields: { type: 'object', additionalProperties: true, title: 'Field values', description: 'Field values to write.' },
+                    },
+                    required: ['objectName'],
+                },
             }),
             async execute(node, variables, context) {
                 const cfg = (node.config ?? {}) as Record<string, unknown>;
@@ -171,6 +209,16 @@ export function registerCrudNodes(engine: AutomationEngine, ctx: PluginContext):
                 type: 'delete_record', version: '1.0.0', name: 'Delete Records',
                 description: 'Delete records matching a filter.',
                 icon: 'trash', category: 'data', source: 'builtin',
+                // Designer form (ADR-0018, #3304) — see get_record for the
+                // keyValue-map rationale.
+                configSchema: {
+                    type: 'object',
+                    properties: {
+                        objectName: { type: 'string', title: 'Object', xRef: { kind: 'object' } },
+                        filter: { type: 'object', additionalProperties: true, title: 'Filter', description: 'Field/value pairs identifying the record(s) to delete.' },
+                    },
+                    required: ['objectName'],
+                },
             }),
             async execute(node, variables, context) {
                 const cfg = (node.config ?? {}) as Record<string, unknown>;
diff --git a/packages/services/service-automation/src/builtin/logic-nodes.ts b/packages/services/service-automation/src/builtin/logic-nodes.ts
index 31e71b89b0..099bf0a360 100644
--- a/packages/services/service-automation/src/builtin/logic-nodes.ts
+++ b/packages/services/service-automation/src/builtin/logic-nodes.ts
@@ -57,6 +57,18 @@ export function registerLogicNodes(engine: AutomationEngine, ctx: PluginContext)
                 type: 'assignment', version: '1.0.0', name: 'Assignment',
                 description: 'Set flow variables.',
                 icon: 'variable', category: 'logic', source: 'builtin',
+                // Designer form (ADR-0018, #3304): the canonical Studio shape — a
+                // single free-form `assignments` map, rendered by the designer's
+                // flat keyValue editor. Values stay `true`-permissive (literals,
+                // `{var}` templates, numbers…). The legacy array / bare-config
+                // shapes the executor also accepts are read-compatible and not
+                // offered for new authoring. No `required`: an empty node is valid.
+                configSchema: {
+                    type: 'object',
+                    properties: {
+                        assignments: { type: 'object', additionalProperties: true, title: 'Assignments', description: 'Set variables: each key is a variable, each value an expression or literal.' },
+                    },
+                },
             }),
             async execute(node, variables, context) {
                 const config = (node.config ?? {}) as Record<string, unknown>;
diff --git a/packages/services/service-automation/src/builtin/screen-nodes.ts b/packages/services/service-automation/src/builtin/screen-nodes.ts
index b3fb82c2ed..65c4a6ee92 100644
--- a/packages/services/service-automation/src/builtin/screen-nodes.ts
+++ b/packages/services/service-automation/src/builtin/screen-nodes.ts
@@ -43,6 +43,37 @@ export function registerScreenNodes(engine: AutomationEngine, ctx: PluginContext
         icon: 'window', category: 'human', source: 'builtin',
         // Human-input nodes suspend the flow awaiting input.
         supportsPause: true, isAsync: true,
+        // Designer form (ADR-0018, #3304) — mirrors objectui's hardcoded `screen`
+        // field group: flat input list OR an object form, plus title/description.
+        // `visibleWhen` is bare CEL (xExpression), `defaults` a free-form keyValue
+        // map (values may be `{var}` templates → `true`-permissive).
+        configSchema: {
+          type: 'object',
+          properties: {
+            title: { type: 'string', title: 'Title', description: 'Heading shown above the screen.' },
+            description: { type: 'string', format: 'multiline', title: 'Description', description: 'Body text. Interpolates {var} references (e.g. {approval_path}).' },
+            fields: {
+              type: 'array',
+              title: 'Fields',
+              description: 'Input fields collected on this screen. Leave empty for a message-only screen.',
+              items: {
+                type: 'object',
+                properties: {
+                  name: { type: 'string', title: 'Name' },
+                  label: { type: 'string', title: 'Label' },
+                  type: { type: 'string', title: 'Type' },
+                  required: { type: 'boolean', title: 'Required' },
+                  visibleWhen: { type: 'string', title: 'Visible when', xExpression: 'expression' },
+                },
+              },
+            },
+            waitForInput: { type: 'boolean', title: 'Wait for input', description: 'Pause to show this screen even with no fields (a message / confirmation). A field-less screen with this off is a server pass-through.' },
+            objectName: { type: 'string', title: 'Object form', xRef: { kind: 'object' }, description: 'Render this object’s full create/edit form (incl. master-detail) instead of a flat field list.' },
+            idVariable: { type: 'string', title: 'Saved-record variable', description: 'Object form only: variable bound to the saved record’s id, for later steps.' },
+            mode: { type: 'string', enum: ['create', 'edit'], default: 'create', title: 'Form mode', description: 'Object form only.' },
+            defaults: { type: 'object', additionalProperties: true, title: 'Form defaults', description: 'Object form only: prefilled values (e.g. account → {account_id}).' },
+          },
+        },
       }),
       async execute(node, variables, context) {
         const cfg = (node.config ?? {}) as Record<string, unknown>;