@@ -0,0 +1,10 @@
+---
+'@object-ui/core': patch
+---
+
+fix(core): an `api` action's target is interpolated before a registered `api` handler sends it
+
+Clause-②: no
+Metadata-protocol: none
+
+An `api` action whose `target` carries `${ctx.recordId}` (or any other `${ctx.X}` / `${param.X}` token) went out on the wire with the literal placeholder (`/api/v1/data/gapdata_item/$%7Bctx.recordId%7D`) when a host had registered its own `api` handler, as the Console does, so a record-level PATCH or POST hit a record that does not exist. A `url` action with the same token already resolved it. `ActionRunner` now runs its one target substitution on an `api` target before handing the action to a registered `api` handler, with the same scopes and the same per-value `encodeURIComponent` a `url` target gets. The built-in executor already did this and is unchanged; a registered handler for any other type still receives its target as authored.
@@ -1680,7 +1680,18 @@ export class ActionRunner {
       // Check for a registered custom handler first
       if (actionType && this.handlers.has(actionType)) {
         const handler = this.handlers.get(actionType)!;
-        return handler(action, this.context);
+        // An `api` target is interpolated HERE, by the runner, before a host
+        // handler sees it — the same `interpolateTarget` the built-in
+        // `executeAPI` and `executeUrl` run. A registered `api` handler (the
+        // console's) replaces `executeAPI` wholesale, so without this the spec's
+        // documented `${ctx.recordId}` went out on the wire as the literal
+        // placeholder while a `url` target with the same token resolved. One
+        // substitution, one vocabulary, one encoding, whoever sends the request.
+        // A target with no token reaches the handler as the same object.
+        const target = actionType === 'api' && typeof action.target === 'string'
+          ? this.interpolateTarget(action.target, action)
+          : action.target;
+        return handler(target === action.target ? action : { ...action, target }, this.context);
       }
 
       // Built-in action execution by type.
@@ -2802,7 +2813,8 @@ export class ActionRunner {
   /**
    * Substitute `${param.X}` and `${ctx.X}` tokens in an action target.
    *
-   * Used by executeUrl and executeAPI so metadata can produce dynamic
+   * Used by executeUrl and executeAPI — and on an `api` target before a
+   * registered `api` handler receives it — so metadata can produce dynamic
    * URLs without coupling to the wider ExpressionEvaluator surface
    * (which would also evaluate operators, member access, etc. — overkill
    * and unsafe for URL-position values).
@@ -2867,7 +2879,8 @@ export class ActionRunner {
     //
     // `result` (the handler's own return value) is passed by exactly one caller:
     // the `ActionSchema.onSuccess` post-success hop, where a response exists.
-    // Every other caller — `executeUrl`, `executeAPI` — interpolates a target
+    // Every other caller — `executeUrl`, `executeAPI`, the registered `api`
+    // handler hand-off in `dispatchCollected` — interpolates a target
     // BEFORE the request, so there is no result to read; admitting `${result.*}`
     // there would widen the authorable surface with nothing behind it and
     // silently blank the token instead of leaving the author's mistake visible.
 
@@ -0,0 +1,122 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * An `api` action's `target` is interpolated before a REGISTERED `api` handler
+ * receives it, through the same substitution a `url` target goes through.
+ *
+ * The console registers its own `api` handler, which replaces the built-in
+ * `executeAPI` wholesale. Only `executeAPI` called `interpolateTarget`, so on a
+ * record page `target: "/api/v1/data/gapdata_item/${ctx.recordId}"` reached the
+ * wire as `…/$%7Bctx.recordId%7D` for PATCH and POST alike, while a `url`
+ * action with the same token opened the resolved address.
+ *
+ * Pinned here: what the handler receives for PATCH and POST, that the encoding
+ * is the url target's (one opaque segment per value), that the built-in
+ * executor sends the same path, that a `url` action is unchanged, and that a
+ * non-`api` handler still receives its target as authored.
+ */
+
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { ActionRunner, type ActionContext, type ActionDef, type ActionRunnerHandler } from '../ActionRunner';
+
+const RECORD_PAGE: ActionContext = {
+  record: { id: 'gd_001', name: 'Gap item' },
+  objectName: 'gapdata_item',
+};
+
+const TARGET = '/api/v1/data/gapdata_item/${ctx.recordId}';
+// A url target under `/api/` leaves through `window.location`, not the host's
+// navigation handler, so the url control uses a route path with the same token.
+const URL_TARGET = '/gapdata_item/${ctx.recordId}';
+
+function recordingApiHandler() {
+  const seen: ActionDef[] = [];
+  const handler: ActionRunnerHandler = async (action) => {
+    seen.push(action);
+    return { success: true, silent: true };
+  };
+  return { seen, handler };
+}
+
+describe('api targets interpolate before a registered api handler (objectstack#26722)', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it.each(['PATCH', 'POST'])('a %s api action hands the handler the resolved record path', async (method) => {
+    const runner = new ActionRunner(RECORD_PAGE);
+    const { seen, handler } = recordingApiHandler();
+    runner.registerHandler('api', handler);
+
+    const result = await runner.execute({ type: 'api', name: 'call_api', target: TARGET, method });
+
+    expect(result.success).toBe(true);
+    expect(seen).toHaveLength(1);
+    expect(seen[0].target).toBe('/api/v1/data/gapdata_item/gd_001');
+    expect(seen[0].method).toBe(method);
+  });
+
+  it('an api target with no token reaches the handler as the same action object', async () => {
+    const runner = new ActionRunner(RECORD_PAGE);
+    const { seen, handler } = recordingApiHandler();
+    runner.registerHandler('api', handler);
+    const action: ActionDef = { type: 'api', name: 'plain', target: '/api/v1/data/gapdata_item', method: 'POST' };
+
+    await runner.execute(action);
+
+    expect(seen[0]).toBe(action);
+  });
+
+  it('encodes each value the way a url target does', async () => {
+    const context: ActionContext = { record: { id: 'a/b c' }, objectName: 'gapdata_item' };
+    const runner = new ActionRunner(context);
+    const { seen, handler } = recordingApiHandler();
+    runner.registerHandler('api', handler);
+    const navigate = vi.fn();
+    runner.setNavigationHandler(navigate);
+
+    await runner.execute({ type: 'api', name: 'call_api', target: TARGET, method: 'PATCH' });
+    await runner.execute({ type: 'url', name: 'open', target: URL_TARGET });
+
+    expect(seen[0].target).toBe('/api/v1/data/gapdata_item/a%2Fb%20c');
+    expect(navigate.mock.calls[0][0]).toBe('/gapdata_item/a%2Fb%20c');
+  });
+
+  it('the built-in executor sends the same resolved path', async () => {
+    const fetchMock = vi.fn().mockResolvedValue({ ok: true, json: vi.fn().mockResolvedValue({}) });
+    vi.stubGlobal('fetch', fetchMock);
+    const runner = new ActionRunner(RECORD_PAGE);
+
+    await runner.execute({ type: 'api', name: 'export_tab', target: TARGET, method: 'POST' });
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      '/api/v1/data/gapdata_item/gd_001',
+      expect.objectContaining({ method: 'POST' }),
+    );
+  });
+
+  it('a url action with the same token is unchanged', async () => {
+    const runner = new ActionRunner(RECORD_PAGE);
+    const navigate = vi.fn();
+    runner.setNavigationHandler(navigate);
+
+    const result = await runner.execute({ type: 'url', name: 'open', target: URL_TARGET });
+
+    expect(result.success).toBe(true);
+    expect(navigate).toHaveBeenCalledTimes(1);
+    expect(navigate.mock.calls[0][0]).toBe('/gapdata_item/gd_001');
+  });
+
+  it('a registered non-api handler still receives its target as authored', async () => {
+    const runner = new ActionRunner(RECORD_PAGE);
+    const seen: ActionDef[] = [];
+    runner.registerHandler('flow', async (action) => {
+      seen.push(action);
+      return { success: true, silent: true };
+    });
+
+    await runner.execute({ type: 'flow', name: 'run_flow', target: 'flow_${ctx.recordId}' });
+
+    expect(seen[0].target).toBe('flow_${ctx.recordId}');
+  });
+});