diff --git a/bun.lock b/bun.lock
index 61acacdc1..27bd147ae 100644
--- a/bun.lock
+++ b/bun.lock
@@ -1251,6 +1251,7 @@
         "@corbits/api-query": "workspace:*",
         "@corbits/bench-ui": "workspace:*",
         "@corbits/chat-ui": "workspace:*",
+        "@corbits/error-sink": "workspace:*",
         "@corbits/icons": "workspace:*",
         "@corbits/inference-settings": "workspace:*",
         "@corbits/react-ui": "github:corbitsdev/react-ui#3b122812a307ccb35be31386f7696020c5a84635",
diff --git a/packages/settings-ui/package.json b/packages/settings-ui/package.json
index 53073b9cd..195fc707c 100644
--- a/packages/settings-ui/package.json
+++ b/packages/settings-ui/package.json
@@ -20,6 +20,7 @@
     "@corbits/api-query": "workspace:*",
     "@corbits/bench-ui": "workspace:*",
     "@corbits/chat-ui": "workspace:*",
+    "@corbits/error-sink": "workspace:*",
     "@corbits/inference-settings": "workspace:*",
     "@corbits/react-ui": "github:corbitsdev/react-ui#3b122812a307ccb35be31386f7696020c5a84635",
     "@corbits/workflow-catalog": "workspace:*",
diff --git a/packages/settings-ui/src/people-section.tsx b/packages/settings-ui/src/people-section.tsx
index 3c96d0dd3..58d3799de 100644
--- a/packages/settings-ui/src/people-section.tsx
+++ b/packages/settings-ui/src/people-section.tsx
@@ -36,6 +36,7 @@ import {
   UnauthenticatedError,
   describeQueryError,
 } from "@corbits/api-query";
+import { reportError } from "@corbits/error-sink";
 import { PRINCIPAL_KIND_LABEL, principalLabel } from "./identity";
 import { AccessPolicyBlock } from "./access-policy";
 import {
@@ -171,7 +172,10 @@ export function PeopleSection({
         setInviteOpen(false);
         reload();
       })
-      .catch(() => setInviteError(SETTINGS_STRINGS.peopleInviteError))
+      .catch((cause: unknown) => {
+        reportError(cause, { operation: "settings.people.invite", tenantId });
+        setInviteError(SETTINGS_STRINGS.peopleInviteError);
+      })
       .finally(() => setInviting(false));
   }
 
@@ -180,7 +184,13 @@ export function PeopleSection({
     setRowError(null);
     deletePendingInvite(tenantId, invite.id)
       .then(reload)
-      .catch(() => setRowError(SETTINGS_STRINGS.pendingInviteCancelError));
+      .catch((cause: unknown) => {
+        reportError(cause, {
+          operation: "settings.people.cancelInvite",
+          tenantId,
+        });
+        setRowError(SETTINGS_STRINGS.pendingInviteCancelError);
+      });
   }
 
   function handleStatusChange(
@@ -191,7 +201,13 @@ export function PeopleSection({
     setRowError(null);
     updatePrincipalStatus(tenantId, principal.id, status)
       .then(reload)
-      .catch(() => setRowError(SETTINGS_STRINGS.peopleStatusUpdateError));
+      .catch((cause: unknown) => {
+        reportError(cause, {
+          operation: "settings.people.updateStatus",
+          tenantId,
+        });
+        setRowError(SETTINGS_STRINGS.peopleStatusUpdateError);
+      });
   }
 
   function handleRemove(principal: Principal) {
@@ -199,7 +215,10 @@ export function PeopleSection({
     setRowError(null);
     removePrincipal(tenantId, principal.id)
       .then(reload)
-      .catch(() => setRowError(SETTINGS_STRINGS.peopleRemoveError));
+      .catch((cause: unknown) => {
+        reportError(cause, { operation: "settings.people.remove", tenantId });
+        setRowError(SETTINGS_STRINGS.peopleRemoveError);
+      });
   }
 
   function handleRoleChange(
@@ -232,7 +251,13 @@ export function PeopleSection({
     )
       .then(() => assignRole(tenantId, principal.id, newRoleId))
       .then(reload)
-      .catch(() => setRowError(SETTINGS_STRINGS.peopleRoleChangeError));
+      .catch((cause: unknown) => {
+        reportError(cause, {
+          operation: "settings.people.changeRole",
+          tenantId,
+        });
+        setRowError(SETTINGS_STRINGS.peopleRoleChangeError);
+      });
   }
 
   return (
diff --git a/packages/settings-ui/test/people-section.test.tsx b/packages/settings-ui/test/people-section.test.tsx
index 64f7ae73a..56715fa79 100644
--- a/packages/settings-ui/test/people-section.test.tsx
+++ b/packages/settings-ui/test/people-section.test.tsx
@@ -8,12 +8,23 @@
 // native role-assignment routes, the last owner can't be demoted, and a
 // pending invite can be cancelled.
 
-import { afterEach, describe, expect, test } from "bun:test";
+import { afterEach, describe, expect, mock, test } from "bun:test";
 import { act } from "react";
 import { createRoot } from "react-dom/client";
 import type { Root } from "react-dom/client";
 
-import { PeopleSection } from "../src/people-section";
+const reportErrorCalls: {
+  error: unknown;
+  context: Record<string, unknown>;
+}[] = [];
+mock.module("@corbits/error-sink", () => ({
+  reportError: (error: unknown, context: Record<string, unknown>) => {
+    reportErrorCalls.push({ error, context });
+    return "ref_test";
+  },
+}));
+
+const { PeopleSection } = await import("../src/people-section");
 
 const realFetch = globalThis.fetch;
 afterEach(() => {
@@ -416,4 +427,208 @@ describe("PeopleSection", () => {
       container.remove();
     }
   });
+
+  // CL-7139: every mutation catch must report the failure through
+  // reportError with its own operation, not just set the generic message.
+  const REPORT_ERROR_CASES: {
+    readonly name: string;
+    readonly operation: string;
+    readonly principals: unknown[];
+    readonly invites: { readonly data: unknown[] };
+    readonly failingHandler: Record<string, unknown>;
+    readonly trigger: (container: HTMLDivElement) => Promise<void>;
+  }[] = [
+    {
+      name: "invite",
+      operation: "settings.people.invite",
+      principals: [humanPrincipal()],
+      invites: noInvites,
+      failingHandler: {
+        "POST /api/tenants/tnt_1/access-policy/pending-invites": () =>
+          json(500, { error: "boom" }),
+      },
+      trigger: async (container) => {
+        const inviteButton = Array.from(
+          container.querySelectorAll("button"),
+        ).find((b) => b.textContent === "Invite someone");
+        act(() =>
+          inviteButton?.dispatchEvent(
+            new MouseEvent("click", { bubbles: true }),
+          ),
+        );
+        await settle();
+        const emailInput = document.querySelector(
+          'input[type="email"]',
+        ) as HTMLInputElement;
+        act(() => setNativeValue(emailInput, "bob@example.com"));
+        await settle();
+        const form = document.getElementById(
+          "invite-person-form",
+        ) as HTMLFormElement;
+        act(() => {
+          form.dispatchEvent(
+            new Event("submit", { bubbles: true, cancelable: true }),
+          );
+        });
+        await settle();
+      },
+    },
+    {
+      name: "cancelInvite",
+      operation: "settings.people.cancelInvite",
+      principals: [humanPrincipal()],
+      invites: {
+        data: [
+          {
+            id: "pinv_1",
+            tenantId: "tnt_1",
+            matchType: "email",
+            value: "carol@example.com",
+            roleId: "role_member",
+            createdAt: timestamps.createdAt,
+          },
+        ],
+      },
+      failingHandler: {
+        "DELETE /api/tenants/tnt_1/access-policy/pending-invites/pinv_1": () =>
+          json(500, { error: "boom" }),
+      },
+      trigger: async (container) => {
+        const cancelButton = Array.from(
+          container.querySelectorAll("button"),
+        ).find((b) => b.textContent === "Cancel");
+        act(() =>
+          cancelButton?.dispatchEvent(
+            new MouseEvent("click", { bubbles: true }),
+          ),
+        );
+        await settle();
+        const confirmButton = Array.from(
+          container.querySelectorAll("button"),
+        ).find((b) => b.textContent?.includes("Cancel this invite"));
+        act(() =>
+          confirmButton?.dispatchEvent(
+            new MouseEvent("click", { bubbles: true }),
+          ),
+        );
+        await settle();
+      },
+    },
+    {
+      name: "updateStatus",
+      operation: "settings.people.updateStatus",
+      principals: [humanPrincipal()],
+      invites: noInvites,
+      failingHandler: {
+        "PATCH /api/tenants/tnt_1/principals/prn_human_1": () =>
+          json(500, { error: "boom" }),
+      },
+      trigger: async (container) => {
+        const suspendButton = Array.from(
+          container.querySelectorAll("button"),
+        ).find((b) => b.textContent === "Suspend");
+        act(() =>
+          suspendButton?.dispatchEvent(
+            new MouseEvent("click", { bubbles: true }),
+          ),
+        );
+        await settle();
+      },
+    },
+    {
+      name: "remove",
+      operation: "settings.people.remove",
+      principals: [humanPrincipal()],
+      invites: noInvites,
+      failingHandler: {
+        "DELETE /api/tenants/tnt_1/principals/prn_human_1": () =>
+          json(500, { error: "boom" }),
+      },
+      trigger: async (container) => {
+        const removeButton = Array.from(
+          container.querySelectorAll("button"),
+        ).find((b) => b.textContent === "Remove");
+        act(() =>
+          removeButton?.dispatchEvent(
+            new MouseEvent("click", { bubbles: true }),
+          ),
+        );
+        await settle();
+        const confirmButton = Array.from(
+          container.querySelectorAll("button"),
+        ).find((b) => b.textContent === "Remove for good?");
+        act(() =>
+          confirmButton?.dispatchEvent(
+            new MouseEvent("click", { bubbles: true }),
+          ),
+        );
+        await settle();
+      },
+    },
+    {
+      name: "changeRole",
+      operation: "settings.people.changeRole",
+      principals: [
+        humanPrincipal(),
+        humanPrincipal({
+          id: "prn_human_2",
+          displayName: "Bob Baker",
+          refId: "user_2",
+          roles: [{ id: MEMBER_ROLE.id, name: MEMBER_ROLE.name }],
+        }),
+      ],
+      invites: noInvites,
+      failingHandler: {
+        "DELETE /api/tenants/tnt_1/principals/prn_human_2/roles/role_member":
+          () => json(500, { error: "boom" }),
+      },
+      trigger: async (container) => {
+        const selects = container.querySelectorAll("tbody select");
+        const bobSelect = Array.from(selects).find(
+          (s) => (s as HTMLSelectElement).value === "role_member",
+        ) as HTMLSelectElement;
+        act(() => {
+          bobSelect.value = "role_owner";
+          bobSelect.dispatchEvent(new Event("change", { bubbles: true }));
+        });
+        await settle();
+      },
+    },
+  ];
+
+  for (const testCase of REPORT_ERROR_CASES) {
+    test(`a failing ${testCase.name} reports the error with its operation and tenant`, async () => {
+      const calls: FetchCall[] = [];
+      reportErrorCalls.length = 0;
+      mockFetch(
+        {
+          "/api/tenants/tnt_1/principals": {
+            data: testCase.principals,
+            nextCursor: null,
+          },
+          "/api/tenants/tnt_1/roles": rolesPage,
+          "/api/tenants/tnt_1/access-policy/pending-invites": testCase.invites,
+          ...testCase.failingHandler,
+        },
+        calls,
+      );
+
+      const { container, root } = mount();
+      try {
+        await settle();
+        await testCase.trigger(container);
+
+        expect(
+          reportErrorCalls.some(
+            (call) =>
+              call.context.operation === testCase.operation &&
+              call.context.tenantId === "tnt_1",
+          ),
+        ).toBe(true);
+      } finally {
+        act(() => root.unmount());
+        container.remove();
+      }
+    });
+  }
 });