diff --git a/.changeset/7654-floating-chatbot-trigger-icon-tombstone.md b/.changeset/7654-floating-chatbot-trigger-icon-tombstone.md
new file mode 100644
index 000000000..9b382d360
--- /dev/null
+++ b/.changeset/7654-floating-chatbot-trigger-icon-tombstone.md
@@ -0,0 +1,70 @@
+---
+'@object-ui/types': minor
+---
+
+Retire `FloatingChatbotConfig.triggerIcon` (objectui#7654, ADR-0049 enforce-or-remove).
+
+`triggerIcon` was declared `?: string` with `@default 'MessageCircle'` and read by nothing.
+`FloatingChatbot` destructures six of the interface's seven keys — `position`,
+`defaultOpen`, `panelWidth`, `panelHeight`, `title`, `triggerSize` — and never this one,
+and `FloatingChatbotTrigger` takes no icon prop at all, so the advertised default never
+rendered either. Re-measured on this branch's base rather than inherited from the card: a
+whole-repo `git grep` census over tracked files, build output excluded, returns the
+declaration and one historical CHANGELOG line and nothing else, while the same pass over
+`triggerSize` — a key that IS read — returns ten sites across four files, so the instrument
+was not blind.
+
+It is also absent from the `chatbot-floating` registration's `inputs` AND from its
+`defaultProps` (`packages/plugin-chatbot/src/renderer.tsx`), both re-confirmed here. No
+designer control ever offered it and no designer-created node carries it, so TypeScript was
+the only way to reach the key. That is what makes this half of objectui#7654 an ordinary
+retirement; the card's other key, `displayMode`, is seeded into `defaultProps` and is NOT
+touched here.
+
+FROM → TO: `triggerIcon?: string` → **tombstoned**, `?: never` on the interface. The FAB
+trigger renders a fixed icon and takes no icon prop; there is no authored spelling that
+changes it.
+
+## This tombstone has NO Zod half, deliberately
+
+Every other tombstone in this package pairs `?: never` with a `retirementTombstone()`
+refusal on the Zod twin. There is no twin here to carry one: `FloatingChatbotConfig` has no
+Zod mirror at all, and `floatingConfig` sits in the `UnmirroredDeclared` ledger
+(`zod-mirror-parity.test.ts`, `complex.zod.ts#ChatbotSchema`). `BaseSchema` is
+`.passthrough()`, so the whole `floatingConfig` object rides through unvalidated — before
+this change and after it. Minting a mirror to host a refusal would be the
+declared-but-UNMIRRORED axis (objectui#6152), a different defect: a key can be mirrored and
+inert, or unmirrored and live, and fixing one says nothing about the other. This change
+does not widen into it.
+
+**Accept-set change, stated plainly for reviewers:** on the TypeScript face, a write of
+`FloatingChatbotConfig.triggerIcon` used to compile and now does not. On the runtime face,
+nothing changes at all — the key parsed green before and parses green after. The refusal is
+TYPE-LEVEL ONLY, which is narrower than this package's other tombstones and is the reason
+this carries a contract-review label rather than being filed as an internal tidy-up.
+
+## Why a tombstone and not a deletion, when the usual argument does not apply
+
+The usual case for `?: never` argues from the mirror: an undeclared key is silently
+STRIPPED by a non-strict `z.object`, so deleting trades one silent no-op for another. With
+no mirror, that argument is unavailable, so the route was measured on the `tsc` channel
+alone instead:
+
+| route | fresh object literal | widened (non-fresh) value |
+|---|---|---|
+| deleted | `TS2353` excess-property error | **compiles CLEAN** |
+| tombstoned | `TS2322` | `TS2322` |
+
+Excess-property checking only reaches a fresh literal, so deletion would have left the
+widened path — `const raw = { triggerIcon: 'Sparkles' }; const cfg: FloatingChatbotConfig =
+raw;` — silently accepting a key nothing reads. The declared `never` makes the assignment
+itself ill-typed, so freshness stops mattering. Both rows are pinned in
+`packages/types/src/__tests__/floating-chatbot-trigger-icon-retired.test.ts`, the "deleted"
+row as a live control on a genuinely undeclared key rather than as prose, so the contrast
+cannot rot.
+
+That file also pins the runtime half as a **tripwire**: it asserts that a node carrying
+`floatingConfig.triggerIcon` still parses green. If objectui#6152 ever mints a
+`FloatingChatbotConfigSchema`, it goes red — the intended signal that whoever lands the
+mirror must add the `retirementTombstone()` half at the same time and flip the control
+rather than delete it into a vacuum.
diff --git a/packages/types/src/__tests__/floating-chatbot-trigger-icon-retired.test.ts b/packages/types/src/__tests__/floating-chatbot-trigger-icon-retired.test.ts
new file mode 100644
index 000000000..59279daeb
--- /dev/null
+++ b/packages/types/src/__tests__/floating-chatbot-trigger-icon-retired.test.ts
@@ -0,0 +1,148 @@
+/**
+ * ObjectUI
+ * Copyright (c) 2024-present ObjectStack Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * `FloatingChatbotConfig.triggerIcon` is an ADR-0049 RETIREMENT TOMBSTONE
+ * (objectui#7654), and — unlike every other tombstone in this package — its
+ * refusal is TYPE-LEVEL ONLY. Both halves of that sentence are pinned here.
+ *
+ * ## What was measured
+ *
+ * `triggerIcon` was declared `?: string` with `@default 'MessageCircle'` and
+ * read by nothing. `FloatingChatbot` destructures six of the interface's seven
+ * keys (`position`, `defaultOpen`, `panelWidth`, `panelHeight`, `title`,
+ * `triggerSize`) and never this one, and `FloatingChatbotTrigger` takes no icon
+ * prop, so the advertised default never rendered. A whole-repo `git grep`
+ * census over tracked files, build output excluded, returned the declaration
+ * and one historical CHANGELOG line and nothing else; the same pass over
+ * `triggerSize` returned ten sites across four files, so the instrument was not
+ * blind. It is absent from the `chatbot-floating` registration's `inputs` and
+ * from its `defaultProps`, so no designer control offered it and no
+ * designer-created node carries it — TypeScript was the only way to reach it.
+ *
+ * ## Why a tombstone, when the usual reason does not apply
+ *
+ * The other tombstones here argue from the mirror: an undeclared key is
+ * silently STRIPPED by a non-strict `z.object`, so deletion trades one silent
+ * no-op for another. That argument needs a mirror, and this key has none (see
+ * the runtime section below). The tombstone earns its place on the `tsc`
+ * channel alone, measured both ways on the retiring PR's merge-base:
+ *
+ *   | route      | fresh object literal          | widened (non-fresh) value |
+ *   |------------|-------------------------------|---------------------------|
+ *   | deleted    | TS2353 excess-property error  | **compiles CLEAN**        |
+ *   | tombstoned | TS2322                        | TS2322                    |
+ *
+ * Excess-property checking only reaches a FRESH literal, so deleting the key
+ * would have left the widened path silently accepting it. The declared `never`
+ * makes the assignment itself ill-typed, so freshness stops mattering. That
+ * contrast is not prose here — it is pinned live: the `bogusUndeclared` control
+ * below IS the "deleted" row, carrying no directive because a key this
+ * interface does not declare really does ride the widened path unchallenged.
+ *
+ * The `@ts-expect-error` directives are REAL enforcement: this package
+ * type-checks its tests through `tsconfig.test.json`, so re-widening the
+ * declaration fails the build on the unused directive. A green `vitest` run is
+ * NOT evidence about them — type assertions are erased before it runs.
+ */
+
+import { describe, it, expect } from 'vitest';
+import type { FloatingChatbotConfig } from '../complex';
+import { ChatbotSchema } from '../zod/complex.zod';
+
+/* ── type-level pins: the `tsc` channel ──────────────────────────────────── */
+
+describe('the `triggerIcon` tombstone makes authoring a `tsc` error', () => {
+  it('refuses it in a FRESH object literal', () => {
+    const config: FloatingChatbotConfig = {
+      title: 'Chat',
+      // @ts-expect-error `triggerIcon` is a retirement tombstone (objectui#7654)
+      triggerIcon: 'Sparkles',
+    };
+    expect(config.title).toBe('Chat');
+  });
+
+  it('refuses it through a WIDENED value too — the half a deletion would have missed', () => {
+    const raw = { title: 'Chat', triggerIcon: 'Sparkles' };
+    // @ts-expect-error `triggerIcon` is a retirement tombstone (objectui#7654)
+    const config: FloatingChatbotConfig = raw;
+    expect(config.title).toBe('Chat');
+  });
+
+  it('keeps the six LIVE keys writable — the non-vacuity control', () => {
+    // Without this, a change that broke the whole interface would satisfy both
+    // assertions above by accident. These six are the keys `FloatingChatbot`
+    // actually destructures.
+    const config: FloatingChatbotConfig = {
+      position: 'bottom-right',
+      defaultOpen: false,
+      panelWidth: 400,
+      panelHeight: 520,
+      title: 'Chat',
+      triggerSize: 56,
+    };
+    expect(config.triggerSize).toBe(56);
+  });
+
+  it('a key the interface never declared still rides the widened path — the DELETED row', () => {
+    // This carries NO directive on purpose. It is the measured contrast that
+    // justifies `?: never` over deletion: an undeclared key IS refused in a
+    // fresh literal but is NOT refused here. Had `triggerIcon` been deleted
+    // rather than tombstoned, it would sit exactly where this line sits.
+    const raw = { title: 'Chat', bogusUndeclared: 1 };
+    const config: FloatingChatbotConfig = raw;
+    expect(config.title).toBe('Chat');
+  });
+});
+
+/* ── the runtime channel: DELIBERATELY unchanged, and a tripwire if that ends ─ */
+
+describe('there is NO zod refusal, and that is deliberate (objectui#7654)', () => {
+  const node = {
+    type: 'chatbot' as const,
+    messages: [{ id: 'm1', role: 'user' as const, content: 'hi' }],
+  };
+
+  it('a chatbot node carrying `floatingConfig.triggerIcon` still parses GREEN', () => {
+    // `FloatingChatbotConfig` has NO zod mirror: `floatingConfig` sits in the
+    // `UnmirroredDeclared` ledger (`zod-mirror-parity.test.ts`,
+    // `complex.zod.ts#ChatbotSchema`), and `BaseSchema` is `.passthrough()`, so
+    // the whole object rides through unvalidated. This was green before the
+    // tombstone and is green after it — the retirement changed the TypeScript
+    // face only, and this pins that it changed no parse outcome.
+    //
+    // ⚠️ TRIPWIRE: if objectui#6152 ever mints a `FloatingChatbotConfigSchema`,
+    // this goes RED. That is the intended signal, not a nuisance — whoever
+    // lands the mirror must add the `retirementTombstone()` half for
+    // `triggerIcon` at the same time, and flip this control rather than delete
+    // it into a vacuum.
+    const result = ChatbotSchema.safeParse({
+      ...node,
+      floatingConfig: { title: 'Chat', triggerIcon: 'Sparkles' },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('a live `floatingConfig` parses green too — the non-vacuity control', () => {
+    const result = ChatbotSchema.safeParse({
+      ...node,
+      floatingConfig: { title: 'Chat', triggerSize: 56 },
+    });
+    expect(result.success).toBe(true);
+  });
+
+  it('the mirror really has no `floatingConfig` key at all', () => {
+    // The load-bearing fact behind everything above, asserted rather than
+    // assumed: a key the mirror declares would appear in its shape.
+    const shape = (ChatbotSchema as unknown as { shape: Record<string, unknown> }).shape;
+    expect(shape.floatingConfig).toBeUndefined();
+    // Lit control: a key the mirror DOES declare is present, so the reading
+    // above is a measurement and not an empty object.
+    expect(shape.messages).toBeDefined();
+  });
+});
diff --git a/packages/types/src/complex.ts b/packages/types/src/complex.ts
index b0d9db278..453512295 100644
--- a/packages/types/src/complex.ts
+++ b/packages/types/src/complex.ts
@@ -922,10 +922,71 @@ export interface FloatingChatbotConfig {
    */
   title?: string;
   /**
-   * Custom icon name for the FAB trigger (Lucide icon name).
-   * @default 'MessageCircle'
+   * ADR-0049 RETIREMENT TOMBSTONE — `triggerIcon` (objectui#7654).
+   *
+   * `?: never` is this package's tombstone convention (see {@link
+   * ComponentInput} in `base.ts`, `crud.ts` `confirm`, and {@link
+   * StaticTableColumn} in `data-display.ts`): the key stays DECLARED and
+   * becomes UNWRITABLE, so authoring one is a `tsc` error here.
+   *
+   * What was measured, on the merge-base of the retiring PR: nothing reads it.
+   * `FloatingChatbot` (`plugin-chatbot/src/FloatingChatbot.tsx`) destructures
+   * six of this interface's seven keys — `position`, `defaultOpen`,
+   * `panelWidth`, `panelHeight`, `title`, `triggerSize` — and never this one;
+   * `FloatingChatbotTrigger` takes no icon prop at all, so the promised
+   * `'MessageCircle'` default never rendered either. A whole-repo `git grep`
+   * census over tracked files, build output excluded, returned exactly this
+   * declaration and one historical CHANGELOG line; the same pass over
+   * `triggerSize`, a key that IS read, returned ten sites across four files, so
+   * the instrument was demonstrably not blind.
+   *
+   * It is also absent from the `chatbot-floating` registration's `inputs` AND
+   * its `defaultProps` (`plugin-chatbot/src/renderer.tsx`), so no designer
+   * control ever offered it and no designer-created node carries it. The key
+   * was reachable from TypeScript alone — which is exactly the surface this
+   * tombstone closes.
+   *
+   * ## Why there is NO `retirementTombstone()` half, and why that is not an omission
+   *
+   * The other tombstones in this package pair `?: never` with a
+   * `retirementTombstone()` refusal on the Zod twin. There is no twin to carry
+   * one here: `FloatingChatbotConfig` has NO Zod mirror at all, and
+   * `floatingConfig` sits in the `UnmirroredDeclared` ledger
+   * (`__tests__/zod-mirror-parity.test.ts`, `complex.zod.ts#ChatbotSchema`).
+   * `BaseSchema` is `.passthrough()`, so the whole `floatingConfig` object
+   * rides through unvalidated — before this change and after it, byte for
+   * byte. Minting a mirror to host a refusal would be the declared-but-
+   * UNMIRRORED axis (objectui#6152), a different defect from this one: a key
+   * can be mirrored and inert, or unmirrored and live, and fixing one says
+   * nothing about the other. This retirement deliberately does not widen into
+   * it, so `triggerIcon`'s refusal is TYPE-LEVEL ONLY. Runtime parse behaviour
+   * is unchanged.
+   *
+   * ## Why a tombstone and not a deletion, with only the `tsc` channel available
+   *
+   * The usual argument for `?: never` over deletion is about the mirror (an
+   * undeclared key is silently STRIPPED by a non-strict `z.object`), and with
+   * no mirror here that argument does not apply. The tombstone earns its place
+   * on the TypeScript channel alone instead, measured both ways:
+   *
+   *   - DELETED, a fresh object literal is refused — `TS2353: Object literal
+   *     may only specify known properties` — but a WIDENED value is not.
+   *     `const raw = { triggerIcon: 'Sparkles' }; const c: FloatingChatbotConfig
+   *     = raw;` compiled CLEAN, because excess-property checking does not reach
+   *     a non-fresh type. That is the silent no-op traded for another one.
+   *   - TOMBSTONED, both paths are refused: the declared `never` makes the
+   *     assignment itself ill-typed, so freshness stops mattering.
+   *
+   * Pinned in `__tests__/floating-chatbot-trigger-icon-retired.test.ts`,
+   * including the deletion contrast, so nobody can "simplify" this back into a
+   * deletion without that file going red.
+   *
+   * RETIRED (objectui#7654, ADR-0049) — never read: the FAB trigger renders a
+   * fixed icon and takes no icon prop. There is no authored spelling that
+   * changes it; the trigger's markup is the only place to change it.
+   * @deprecated Not part of `FloatingChatbotConfig`'s contract — the value was inert.
    */
-  triggerIcon?: string;
+  triggerIcon?: never;
   /**
    * Custom size for the FAB trigger button in pixels.
    * @default 56