diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 0e753ced7..4ba1fae4a 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed the `/usage show` `in use by this session:` marker showing only the login email, so two same-email Anthropic credentials in different orgs (a Team seat and a personal Max plan) were indistinguishable. The marker now suffixes the active organization (`email (OrgName)`) via a shared `formatActiveAccountLabel`, matching the account list and login-success surfaces ([#5691](https://github.com/can1357/oh-my-pi/issues/5691)).
+
 ## [17.0.1] - 2026-07-16
 
 ### Changed
diff --git a/packages/coding-agent/src/modes/controllers/command-controller.ts b/packages/coding-agent/src/modes/controllers/command-controller.ts
index 5a8b7a715..6d570e963 100644
--- a/packages/coding-agent/src/modes/controllers/command-controller.ts
+++ b/packages/coding-agent/src/modes/controllers/command-controller.ts
@@ -43,7 +43,7 @@ import type { AuthStorage, OAuthAccountIdentity } from "../../session/auth-stora
 import type { CompactMode } from "../../session/compact-modes";
 import type { NewSessionOptions } from "../../session/session-entries";
 import { formatShakeSummary, type ShakeMode, type ShakeResult } from "../../session/shake-types";
-import { limitMatchesActiveAccount } from "../../slash-commands/helpers/active-oauth-account";
+import { formatActiveAccountLabel, limitMatchesActiveAccount } from "../../slash-commands/helpers/active-oauth-account";
 import { outputMeta } from "../../tools/output-meta";
 import { resolveToCwd, stripOuterDoubleQuotes } from "../../tools/path-utils";
 import { replaceTabs, truncateToWidth } from "../../tools/render-utils";
@@ -1642,7 +1642,7 @@ export function renderUsageReports(
 		}
 
 		lines.push(uiTheme.bold(uiTheme.fg("accent", providerName)));
-		const activeAccountLabel = activeAccount?.email ?? activeAccount?.accountId ?? activeAccount?.projectId;
+		const activeAccountLabel = formatActiveAccountLabel(activeAccount);
 		if (activeAccountLabel) {
 			lines.push(`  ${uiTheme.fg("accent", "in use by this session:")} ${activeAccountLabel}`);
 		}
diff --git a/packages/coding-agent/src/slash-commands/helpers/active-oauth-account.ts b/packages/coding-agent/src/slash-commands/helpers/active-oauth-account.ts
index 00e20c544..af98856d6 100644
--- a/packages/coding-agent/src/slash-commands/helpers/active-oauth-account.ts
+++ b/packages/coding-agent/src/slash-commands/helpers/active-oauth-account.ts
@@ -5,6 +5,22 @@ function normalizeIdentityValue(value: unknown): string | undefined {
 	return typeof value === "string" && value.trim() ? value.trim().toLowerCase() : undefined;
 }
 
+/**
+ * Session marker label for an active OAuth identity: the base identifier
+ * (email → accountId → projectId) suffixed with the organization when present
+ * and distinct. Same-email Anthropic multi-org accounts share the base, so the
+ * org suffix is the only field that tells the session's quota pool apart —
+ * mirrors the account-list rows (`formatUsageReportAccount`) and login success.
+ * Returns `undefined` when no identifier is recoverable.
+ */
+export function formatActiveAccountLabel(identity: OAuthAccountIdentity | undefined): string | undefined {
+	if (!identity) return undefined;
+	const base = identity.email || identity.accountId || identity.projectId;
+	if (!base) return undefined;
+	const org = identity.orgName || identity.orgId;
+	return org && org !== base ? `${base} (${org})` : base;
+}
+
 /**
  * True when a single usage-limit column belongs to the given OAuth identity.
  *
diff --git a/packages/coding-agent/test/usage-report-tui-notes.test.ts b/packages/coding-agent/test/usage-report-tui-notes.test.ts
index c107f7603..d4ce141a9 100644
--- a/packages/coding-agent/test/usage-report-tui-notes.test.ts
+++ b/packages/coding-agent/test/usage-report-tui-notes.test.ts
@@ -82,3 +82,34 @@ describe("renderUsageReports (#3268 TUI aggregate)", () => {
 		expect(occurrences).toBe(1);
 	});
 });
+
+describe("renderUsageReports session marker (#5691 org-qualified identity)", () => {
+	it("suffixes the active org so same-email multi-org accounts are tellable apart", () => {
+		const email = "dev@example.test";
+		const reports: UsageReport[] = [
+			report("anthropic", email, [limit("Claude 7 Day", "weekly", 7 * 24 * HOUR, 0.4)]),
+		];
+		const text = stripVTControlCharacters(
+			renderUsageReports(reports, theme, Date.now(), 120, provider =>
+				provider === "anthropic" ? { email, orgId: "uuid-A", orgName: "Team Org" } : undefined,
+			),
+		);
+		const marker = text.split("\n").find(line => line.includes("in use by this session"));
+		expect(marker).toContain(`${email} (Team Org)`);
+	});
+
+	it("falls back to the bare base when the active identity carries no org", () => {
+		const email = "solo@example.test";
+		const reports: UsageReport[] = [
+			report("anthropic", email, [limit("Claude 7 Day", "weekly", 7 * 24 * HOUR, 0.4)]),
+		];
+		const text = stripVTControlCharacters(
+			renderUsageReports(reports, theme, Date.now(), 120, provider =>
+				provider === "anthropic" ? { email } : undefined,
+			),
+		);
+		const marker = text.split("\n").find(line => line.includes("in use by this session"));
+		expect(marker).toContain(email);
+		expect(marker).not.toContain("(");
+	});
+});