diff --git a/scripts/plugin-sdk-surface-report.mjs b/scripts/plugin-sdk-surface-report.mjs
index a135149779a1..777dd66ad1dc 100644
--- a/scripts/plugin-sdk-surface-report.mjs
+++ b/scripts/plugin-sdk-surface-report.mjs
@@ -195,12 +195,12 @@ export function readPluginSdkSurfaceBudgets(env = process.env) {
     ),
     publicExports: readPluginSdkSurfaceBudgetEnv(
       "OPENCLAW_PLUGIN_SDK_MAX_PUBLIC_EXPORTS",
-      10488,
+      10489,
       env,
     ),
     publicFunctionExports: readPluginSdkSurfaceBudgetEnv(
       "OPENCLAW_PLUGIN_SDK_MAX_PUBLIC_FUNCTION_EXPORTS",
-      5235,
+      5236,
       env,
     ),
     publicDeprecatedExports: readPluginSdkSurfaceBudgetEnv(
diff --git a/src/agents/identity-avatar-projection.ts b/src/agents/identity-avatar-projection.ts
new file mode 100644
index 000000000000..4ddd41c4554b
--- /dev/null
+++ b/src/agents/identity-avatar-projection.ts
@@ -0,0 +1,45 @@
+/**
+ * Projects resolved agent avatars into browser-safe URLs for internal Gateway/UI payloads.
+ */
+import fs from "node:fs";
+import type { AgentAvatarResolution } from "./identity-avatar.js";
+import { openRootFileSync } from "../infra/boundary-file-read.js";
+import { AVATAR_MAX_BYTES, resolveAvatarMime } from "../shared/avatar-policy.js";
+
+function readLocalAvatarDataUrl(
+  resolved: Extract<AgentAvatarResolution, { kind: "local" }>,
+): string | undefined {
+  try {
+    // Keep validation and reading on the same opened descriptor. Reopening the
+    // pathname here would let a symlink swap escape the workspace boundary.
+    const opened = openRootFileSync({
+      absolutePath: resolved.filePath,
+      rootPath: resolved.workspaceRoot,
+      rootRealPath: resolved.workspaceRoot,
+      boundaryLabel: "workspace root",
+      maxBytes: AVATAR_MAX_BYTES,
+      rejectHardlinks: true,
+      skipLexicalRootCheck: true,
+    });
+    if (!opened.ok) {
+      return undefined;
+    }
+    try {
+      const buffer = fs.readFileSync(opened.fd);
+      const mime = resolveAvatarMime(opened.path);
+      return `data:${mime};base64,${buffer.toString("base64")}`;
+    } finally {
+      fs.closeSync(opened.fd);
+    }
+  } catch {
+    return undefined;
+  }
+}
+
+/** Project a verified avatar to the browser-safe value shared by Gateway identity surfaces. */
+export function resolveAgentAvatarUrl(resolved: AgentAvatarResolution): string | undefined {
+  if (resolved.kind === "remote" || resolved.kind === "data") {
+    return resolved.url;
+  }
+  return resolved.kind === "local" ? readLocalAvatarDataUrl(resolved) : undefined;
+}
diff --git a/src/agents/identity-avatar.test.ts b/src/agents/identity-avatar.test.ts
index 9b345a6449fc..7085251e7dee 100644
--- a/src/agents/identity-avatar.test.ts
+++ b/src/agents/identity-avatar.test.ts
@@ -5,7 +5,14 @@ import path from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
 import type { OpenClawConfig } from "../config/config.js";
 import { AVATAR_MAX_BYTES } from "../shared/avatar-policy.js";
-import { resolveAgentAvatar, resolvePublicAgentAvatarSource } from "./identity-avatar.js";
+import {
+  resolveAgentAvatar,
+  resolveAgentAvatarFromSource,
+  resolvePublicAgentAvatarSource,
+} from "./identity-avatar.js";
+import { resolveAgentAvatarUrl } from "./identity-avatar-projection.js";
+
+const AVATAR_MAX_DATA_URL_CHARS = 4 * Math.ceil(AVATAR_MAX_BYTES / 3) + 64;
 
 async function writeFile(filePath: string, contents = "avatar") {
   await fs.mkdir(path.dirname(filePath), { recursive: true });
@@ -212,6 +219,26 @@ describe("resolveAgentAvatar", () => {
     }
   });
 
+  it("projects an avatar at the exact local byte limit without exceeding the data URL cap", async () => {
+    const root = await createTempAvatarRoot();
+    const workspace = path.join(root, "work");
+    const avatarPath = path.join(workspace, "avatars", "max.png");
+    await fs.mkdir(path.dirname(avatarPath), { recursive: true });
+    await fs.writeFile(avatarPath, Buffer.alloc(AVATAR_MAX_BYTES));
+    const resolved = resolveAgentAvatar(
+      {
+        agents: {
+          list: [{ id: "main", workspace, identity: { avatar: "avatars/max.png" } }],
+        },
+      },
+      "main",
+    );
+    const dataUrl = resolveAgentAvatarUrl(resolved);
+
+    expect(dataUrl?.startsWith("data:image/png;base64,")).toBe(true);
+    expect(dataUrl?.length).toBeLessThanOrEqual(AVATAR_MAX_DATA_URL_CHARS);
+  });
+
   it("accepts remote and data avatars", () => {
     const cfg: OpenClawConfig = {
       agents: {
@@ -335,3 +362,116 @@ describe("resolveAgentAvatar", () => {
     await expectLocalAvatarPath(cfg, workspace, "ui-avatar.png", { includeUiOverride: true });
   });
 });
+
+describe("agent avatar browser projection", () => {
+  it("projects local, remote, and data sources without changing their semantics", async () => {
+    const root = await createTempAvatarRoot();
+    const workspace = path.join(root, "work");
+    await writeFile(path.join(workspace, "avatars", "main.png"), "avatar");
+    const cfg: OpenClawConfig = {
+      agents: {
+        list: [{ id: "main", workspace, identity: { avatar: "avatars/main.png" } }],
+      },
+    };
+    const expectedLocal = `data:image/png;base64,${Buffer.from("avatar").toString("base64")}`;
+    const local = resolveAgentAvatar(cfg, "main");
+
+    expect(resolveAgentAvatarUrl(local)).toBe(expectedLocal);
+    expect(
+      resolveAgentAvatarUrl(resolveAgentAvatarFromSource(cfg, "main", "avatars/main.png")),
+    ).toBe(expectedLocal);
+    expect(
+      resolveAgentAvatarUrl(
+        resolveAgentAvatarFromSource(cfg, "main", "https://example.com/avatar.png"),
+      ),
+    ).toBe("https://example.com/avatar.png");
+    expect(
+      resolveAgentAvatarUrl(
+        resolveAgentAvatarFromSource(cfg, "main", "data:image/png;base64,aaaa"),
+      ),
+    ).toBe("data:image/png;base64,aaaa");
+  });
+
+  it.each([
+    ["jpg", "image/jpeg"],
+    ["svg", "image/svg+xml"],
+  ] as const)("uses the shared MIME policy for .%s files", async (extension, mime) => {
+    const root = await createTempAvatarRoot();
+    const workspace = path.join(root, "work");
+    await writeFile(path.join(workspace, `avatar.${extension}`), "avatar");
+    const resolved = resolveAgentAvatar(
+      {
+        agents: {
+          list: [{ id: "main", workspace, identity: { avatar: `avatar.${extension}` } }],
+        },
+      },
+      "main",
+    );
+
+    expect(resolveAgentAvatarUrl(resolved)).toBe(
+      `data:${mime};base64,${Buffer.from("avatar").toString("base64")}`,
+    );
+  });
+
+  it("does not project rejected local avatar paths", async () => {
+    const root = await createTempAvatarRoot();
+    const workspace = path.join(root, "work");
+    await fs.mkdir(workspace, { recursive: true });
+    const missing = resolveAgentAvatar(
+      {
+        agents: {
+          list: [{ id: "main", workspace, identity: { avatar: "avatars/missing.png" } }],
+        },
+      },
+      "main",
+    );
+
+    expect(resolveAgentAvatarUrl(missing)).toBeUndefined();
+  });
+
+  it("rechecks the workspace boundary when a resolved path is replaced before reading", async () => {
+    const root = await createTempAvatarRoot();
+    const workspace = path.join(root, "work");
+    const avatarPath = path.join(workspace, "avatar.png");
+    const outsidePath = path.join(root, "outside.png");
+    await writeFile(avatarPath, "avatar");
+    await writeFile(outsidePath, "secret");
+    const resolved = resolveAgentAvatar(
+      {
+        agents: { list: [{ id: "main", workspace, identity: { avatar: "avatar.png" } }] },
+      },
+      "main",
+    );
+    expect(resolved.kind).toBe("local");
+
+    await fs.rm(avatarPath);
+    try {
+      await fs.symlink(outsidePath, avatarPath);
+    } catch {
+      return;
+    }
+    expect(resolveAgentAvatarUrl(resolved)).toBeUndefined();
+  });
+
+  it("rejects hardlinked avatar files at the read boundary", async () => {
+    const root = await createTempAvatarRoot();
+    const workspace = path.join(root, "work");
+    const outsidePath = path.join(root, "outside.png");
+    const avatarPath = path.join(workspace, "avatar.png");
+    await writeFile(outsidePath, "secret");
+    await fs.mkdir(workspace, { recursive: true });
+    try {
+      await fs.link(outsidePath, avatarPath);
+    } catch {
+      return;
+    }
+    const resolved = resolveAgentAvatar(
+      {
+        agents: { list: [{ id: "main", workspace, identity: { avatar: "avatar.png" } }] },
+      },
+      "main",
+    );
+    expect(resolved.kind).toBe("local");
+    expect(resolveAgentAvatarUrl(resolved)).toBeUndefined();
+  });
+});
diff --git a/src/agents/identity-avatar.ts b/src/agents/identity-avatar.ts
index 7470e85116e3..9638f1e883f7 100644
--- a/src/agents/identity-avatar.ts
+++ b/src/agents/identity-avatar.ts
@@ -25,7 +25,7 @@ import { resolveAgentIdentity } from "./identity.js";
 // shared avatar policy limits.
 export type AgentAvatarResolution =
   | { kind: "none"; reason: string; source?: string }
-  | { kind: "local"; filePath: string; source: string }
+  | { kind: "local"; filePath: string; workspaceRoot: string; source: string }
   | { kind: "remote"; url: string; source: string }
   | { kind: "data"; url: string; source: string };
 
@@ -37,7 +37,7 @@ type AgentAvatarPublicSourceInput = {
 const PUBLIC_AVATAR_SOURCE_MAX_CHARS = 256;
 const PUBLIC_DATA_AVATAR_HEADER_MAX_CHARS = 64;
 
-function resolveAvatarSource(
+function resolveEffectiveAvatarSource(
   cfg: OpenClawConfig,
   agentId: string,
   opts?: { includeUiOverride?: boolean },
@@ -77,7 +77,7 @@ function resolveExistingPath(value: string): string {
 function resolveLocalAvatarPath(params: {
   raw: string;
   workspaceDir: string;
-}): { ok: true; filePath: string } | { ok: false; reason: string } {
+}): { ok: true; filePath: string; workspaceRoot: string } | { ok: false; reason: string } {
   const workspaceRoot = resolveExistingPath(params.workspaceDir);
   const raw = params.raw;
   const resolved =
@@ -104,7 +104,38 @@ function resolveLocalAvatarPath(params: {
   } catch {
     return { ok: false, reason: "missing" };
   }
-  return { ok: true, filePath: realPath };
+  return { ok: true, filePath: realPath, workspaceRoot };
+}
+
+/** Resolve one configured source without applying UI or IDENTITY.md fallback precedence. */
+export function resolveAgentAvatarFromSource(
+  cfg: OpenClawConfig,
+  agentId: string,
+  source: string | null | undefined,
+): AgentAvatarResolution {
+  const normalized = normalizeOptionalString(source) ?? null;
+  if (!normalized) {
+    return { kind: "none", reason: "missing" };
+  }
+  if (isAvatarHttpUrl(normalized)) {
+    return { kind: "remote", url: normalized, source: normalized };
+  }
+  if (isAvatarDataUrl(normalized)) {
+    return { kind: "data", url: normalized, source: normalized };
+  }
+  const resolved = resolveLocalAvatarPath({
+    raw: normalized,
+    workspaceDir: resolveAgentWorkspaceDir(cfg, agentId),
+  });
+  if (!resolved.ok) {
+    return { kind: "none", reason: resolved.reason, source: normalized };
+  }
+  return {
+    kind: "local",
+    filePath: resolved.filePath,
+    workspaceRoot: resolved.workspaceRoot,
+    source: normalized,
+  };
 }
 
 function isSafeRelativeAvatarSource(source: string): boolean {
@@ -151,20 +182,9 @@ export function resolveAgentAvatar(
   agentId: string,
   opts?: { includeUiOverride?: boolean },
 ): AgentAvatarResolution {
-  const source = resolveAvatarSource(cfg, agentId, opts);
-  if (!source) {
-    return { kind: "none", reason: "missing" };
-  }
-  if (isAvatarHttpUrl(source)) {
-    return { kind: "remote", url: source, source };
-  }
-  if (isAvatarDataUrl(source)) {
-    return { kind: "data", url: source, source };
-  }
-  const workspaceDir = resolveAgentWorkspaceDir(cfg, agentId);
-  const resolved = resolveLocalAvatarPath({ raw: source, workspaceDir });
-  if (!resolved.ok) {
-    return { kind: "none", reason: resolved.reason, source };
-  }
-  return { kind: "local", filePath: resolved.filePath, source };
+  return resolveAgentAvatarFromSource(
+    cfg,
+    agentId,
+    resolveEffectiveAvatarSource(cfg, agentId, opts),
+  );
 }
diff --git a/src/gateway/assistant-identity.test.ts b/src/gateway/assistant-identity.test.ts
index 9c96b2164553..ed81cac778e4 100644
--- a/src/gateway/assistant-identity.test.ts
+++ b/src/gateway/assistant-identity.test.ts
@@ -1,9 +1,16 @@
 /**
  * Assistant identity resolution tests for gateway-visible agents.
  */
+import fs from "node:fs/promises";
+import path from "node:path";
 import { describe, expect, it } from "vitest";
 import type { OpenClawConfig } from "../config/config.js";
-import { DEFAULT_ASSISTANT_IDENTITY, resolveAssistantIdentity } from "./assistant-identity.js";
+import { withTempDir } from "../test-helpers/temp-dir.js";
+import {
+  DEFAULT_ASSISTANT_IDENTITY,
+  resolveAssistantIdentity,
+  resolvePublicAssistantIdentity,
+} from "./assistant-identity.js";
 
 describe("resolveAssistantIdentity", () => {
   it("keeps ui.assistant identity authoritative for the default agent", () => {
@@ -128,3 +135,89 @@ describe("resolveAssistantIdentity", () => {
     expect(resolveName(`${"x".repeat(48)}🚀suffix`)).toBe(`${"x".repeat(48)}🚀`);
   });
 });
+
+describe("resolvePublicAssistantIdentity", () => {
+  it("projects workspace avatars to bounded data URLs", async () => {
+    await withTempDir({ prefix: "openclaw-public-avatar-" }, async (workspace) => {
+      await fs.mkdir(path.join(workspace, "avatars"), { recursive: true });
+      await fs.writeFile(path.join(workspace, "avatars", "main.png"), "avatar", "utf8");
+      const identity = resolvePublicAssistantIdentity({
+        cfg: {
+          agents: {
+            defaults: { workspace },
+            list: [{ id: "main", identity: { avatar: "avatars/main.png" } }],
+          },
+        },
+      });
+
+      expect(identity).toMatchObject({
+        avatar: `data:image/png;base64,${Buffer.from("avatar").toString("base64")}`,
+        avatarSource: "avatars/main.png",
+        avatarStatus: "local",
+      });
+      expect(identity.avatar).not.toContain("/avatar/main");
+    });
+  });
+
+  it.each([
+    ["remote", "https://example.com/avatar.png"],
+    ["data", "data:image/png;base64,aaaa"],
+    ["text", "PS"],
+    ["emoji", "🦞"],
+  ] as const)("preserves %s avatar presentation", (_kind, avatar) => {
+    const identity = resolvePublicAssistantIdentity({
+      cfg: { ui: { assistant: { avatar } } },
+      workspaceDir: "",
+    });
+
+    expect(identity.avatar).toBe(avatar);
+    if (_kind === "text" || _kind === "emoji") {
+      expect(identity).toMatchObject({ avatarStatus: "none", avatarReason: undefined });
+      expect(identity.avatarSource).toBeUndefined();
+    }
+  });
+
+  it("preserves same-origin Control UI avatar routes", () => {
+    expect(
+      resolvePublicAssistantIdentity({
+        cfg: { ui: { assistant: { avatar: "/avatar/main" } } },
+        workspaceDir: "",
+      }).avatar,
+    ).toBe("/avatar/main");
+    expect(
+      resolvePublicAssistantIdentity({
+        cfg: { ui: { assistant: { avatar: "/avatar/main" } } },
+        workspaceDir: "",
+        basePath: "/openclaw",
+      }).avatar,
+    ).toBe("/openclaw/avatar/main");
+    expect(
+      resolvePublicAssistantIdentity({
+        cfg: { ui: { assistant: { avatar: "/openclaw/avatar/main" } } },
+        workspaceDir: "",
+        basePath: "/openclaw",
+      }).avatar,
+    ).toBe("/openclaw/avatar/main");
+  });
+
+  it("replaces rejected paths with the default while preserving repair metadata", async () => {
+    await withTempDir({ prefix: "openclaw-public-avatar-missing-" }, async (workspace) => {
+      const identity = resolvePublicAssistantIdentity({
+        cfg: {
+          agents: {
+            defaults: { workspace },
+            list: [{ id: "main", identity: { avatar: "avatars/missing.png" } }],
+          },
+        },
+      });
+
+      expect(identity).toMatchObject({
+        avatar: DEFAULT_ASSISTANT_IDENTITY.avatar,
+        avatarSource: "avatars/missing.png",
+        avatarStatus: "none",
+        avatarReason: "missing",
+      });
+      expect(identity.avatar).not.toContain("/avatar/main");
+    });
+  });
+});
diff --git a/src/gateway/assistant-identity.ts b/src/gateway/assistant-identity.ts
index d2ae6ed34b55..67828f7f1237 100644
--- a/src/gateway/assistant-identity.ts
+++ b/src/gateway/assistant-identity.ts
@@ -3,21 +3,31 @@
 import { normalizeOptionalString } from "@openclaw/normalization-core/string-coerce";
 import { truncateUtf16Safe } from "@openclaw/normalization-core/utf16-slice";
 import { resolveAgentWorkspaceDir, resolveDefaultAgentId } from "../agents/agent-scope.js";
+import {
+  type AgentAvatarResolution,
+  resolveAgentAvatarFromSource,
+  resolvePublicAgentAvatarSource,
+} from "../agents/identity-avatar.js";
+import { resolveAgentAvatarUrl } from "../agents/identity-avatar-projection.js";
 import { resolveAgentIdentity } from "../agents/identity.js";
 import { loadAgentIdentity } from "../commands/agents.config.js";
 import type { OpenClawConfig } from "../config/types.openclaw.js";
 import { normalizeAgentId } from "../routing/session-key.js";
 import {
+  AVATAR_MAX_BYTES,
   isAvatarHttpUrl,
   isAvatarImageDataUrl,
   looksLikeAvatarPath,
 } from "../shared/avatar-policy.js";
+import { CONTROL_UI_AVATAR_PREFIX, normalizeControlUiBasePath } from "./control-ui-shared.js";
+
+const AVATAR_MAX_DATA_URL_CHARS = 4 * Math.ceil(AVATAR_MAX_BYTES / 3) + 64;
 
 const ASSISTANT_IDENTITY_LIMITS = {
   name: 50,
   // Image-bearing avatars must round-trip without truncation. This matches
   // MAX_LOCAL_USER_IMAGE_AVATAR / AVATAR_MAX_BYTES expansion.
-  avatar: 2_000_000,
+  avatar: AVATAR_MAX_DATA_URL_CHARS,
   emoji: 16,
 } as const;
 type AssistantIdentityField = keyof typeof ASSISTANT_IDENTITY_LIMITS;
@@ -40,7 +50,13 @@ function normalizeIdentityValue(
   value: string | undefined,
 ): string | undefined {
   const trimmed = normalizeOptionalString(value);
-  return trimmed ? truncateUtf16Safe(trimmed, ASSISTANT_IDENTITY_LIMITS[field]) : undefined;
+  if (!trimmed) {
+    return undefined;
+  }
+  const limit = ASSISTANT_IDENTITY_LIMITS[field];
+  return field === "avatar" && trimmed.length > limit
+    ? undefined
+    : truncateUtf16Safe(trimmed, limit);
 }
 
 function isAvatarUrl(value: string): boolean {
@@ -84,6 +100,20 @@ function normalizeEmojiValue(value: string | undefined): string | undefined {
   return value;
 }
 
+function resolveSameOriginControlUiAvatarUrl(params: {
+  avatar: string;
+  basePath?: string;
+}): string | undefined {
+  const basePath = normalizeControlUiBasePath(params.basePath);
+  const baseAvatarPrefix = basePath
+    ? `${basePath}${CONTROL_UI_AVATAR_PREFIX}/`
+    : `${CONTROL_UI_AVATAR_PREFIX}/`;
+  if (basePath && params.avatar.startsWith(`${CONTROL_UI_AVATAR_PREFIX}/`)) {
+    return `${basePath}${params.avatar}`;
+  }
+  return params.avatar.startsWith(baseAvatarPrefix) ? params.avatar : undefined;
+}
+
 /** Resolve the display name/avatar/emoji for an agent-facing assistant identity. */
 export function resolveAssistantIdentity(params: {
   cfg: OpenClawConfig;
@@ -129,3 +159,42 @@ export function resolveAssistantIdentity(params: {
 
   return { agentId, name, avatar, emoji };
 }
+
+/** Resolve one consistent browser-facing identity payload for Gateway RPC and bootstrap callers. */
+export function resolvePublicAssistantIdentity(params: {
+  cfg: OpenClawConfig;
+  agentId?: string | null;
+  workspaceDir?: string | null;
+  basePath?: string;
+}) {
+  const identity = resolveAssistantIdentity(params);
+  const sameOriginAvatarUrl = resolveSameOriginControlUiAvatarUrl({
+    avatar: identity.avatar,
+    basePath: params.basePath,
+  });
+  if (sameOriginAvatarUrl) {
+    return {
+      ...identity,
+      avatar: sameOriginAvatarUrl,
+      avatarSource: undefined,
+      avatarStatus: undefined,
+      avatarReason: undefined,
+    };
+  }
+  const resolved = resolveAgentAvatarFromSource(params.cfg, identity.agentId, identity.avatar);
+  const avatarUrl = resolveAgentAvatarUrl(resolved);
+  const isTextAvatar = !avatarUrl && !looksLikeAvatarPath(identity.avatar);
+  const projectionFailed = resolved.kind === "local" && !avatarUrl;
+  const publicResolution: AgentAvatarResolution = projectionFailed
+    ? { kind: "none", reason: "missing", source: resolved.source }
+    : resolved;
+
+  return {
+    ...identity,
+    avatar: avatarUrl ?? (isTextAvatar ? identity.avatar : DEFAULT_ASSISTANT_IDENTITY.avatar),
+    avatarSource: isTextAvatar ? undefined : resolvePublicAgentAvatarSource(publicResolution),
+    avatarStatus: isTextAvatar ? ("none" as const) : publicResolution.kind,
+    avatarReason:
+      !isTextAvatar && publicResolution.kind === "none" ? publicResolution.reason : undefined,
+  };
+}
diff --git a/src/gateway/control-ui-shared.ts b/src/gateway/control-ui-shared.ts
index 357f54ac1cb6..e9d23a44c12d 100644
--- a/src/gateway/control-ui-shared.ts
+++ b/src/gateway/control-ui-shared.ts
@@ -1,10 +1,5 @@
 // Control UI shared URL helpers.
 // Normalizes base paths and avatar URLs for browser/gateway surfaces.
-import {
-  isAvatarHttpUrl,
-  isAvatarImageDataUrl,
-  looksLikeAvatarPath,
-} from "../shared/avatar-policy.js";
 
 const CONTROL_UI_AVATAR_PREFIX = "/avatar";
 
@@ -36,41 +31,5 @@ export function buildControlUiAvatarUrl(basePath: string, agentId: string): stri
     : `${CONTROL_UI_AVATAR_PREFIX}/${agentId}`;
 }
 
-/** Resolves the assistant avatar URL that Control UI should render for the active agent. */
-export function resolveAssistantAvatarUrl(params: {
-  avatar?: string | null;
-  agentId?: string | null;
-  basePath?: string;
-}): string | undefined {
-  const avatar = params.avatar?.trim();
-  if (!avatar) {
-    return undefined;
-  }
-  if (isAvatarHttpUrl(avatar) || isAvatarImageDataUrl(avatar)) {
-    return avatar;
-  }
-
-  const basePath = normalizeControlUiBasePath(params.basePath);
-  const baseAvatarPrefix = basePath
-    ? `${basePath}${CONTROL_UI_AVATAR_PREFIX}/`
-    : `${CONTROL_UI_AVATAR_PREFIX}/`;
-  if (basePath && avatar.startsWith(`${CONTROL_UI_AVATAR_PREFIX}/`)) {
-    return `${basePath}${avatar}`;
-  }
-  if (avatar.startsWith(baseAvatarPrefix)) {
-    return avatar;
-  }
-
-  if (!params.agentId) {
-    return avatar;
-  }
-  // Local filesystem-ish avatar config is exposed through the gateway avatar
-  // route instead of being handed directly to the browser.
-  if (looksLikeAvatarPath(avatar)) {
-    return buildControlUiAvatarUrl(basePath, params.agentId);
-  }
-  return avatar;
-}
-
 /** URL prefix for gateway-served Control UI avatar assets. */
 export { CONTROL_UI_AVATAR_PREFIX };
diff --git a/src/gateway/control-ui.http.test.ts b/src/gateway/control-ui.http.test.ts
index 76e01e00f167..ca3cd91611df 100644
--- a/src/gateway/control-ui.http.test.ts
+++ b/src/gateway/control-ui.http.test.ts
@@ -7,6 +7,7 @@ import type { IncomingMessage } from "node:http";
 import os from "node:os";
 import path from "node:path";
 import { describe, expect, it, vi } from "vitest";
+import type { OpenClawConfig } from "../config/config.js";
 import { resolveStateDir } from "../config/paths.js";
 import {
   approveDevicePairing,
@@ -44,6 +45,9 @@ describe("handleControlUiHttpRequest", () => {
       basePath: string;
       assistantName: string;
       assistantAvatar: string;
+      assistantAvatarSource?: string | null;
+      assistantAvatarStatus?: "none" | "local" | "remote" | "data" | null;
+      assistantAvatarReason?: string | null;
       assistantAgentId: string;
       localMediaPreviewRoots?: string[];
       chatMessageMaxWidth?: string;
@@ -99,6 +103,7 @@ describe("handleControlUiHttpRequest", () => {
     basePath?: string;
     auth?: ResolvedGatewayAuth;
     headers?: IncomingMessage["headers"];
+    config?: OpenClawConfig;
   }) {
     const { res, end } = makeMockHttpResponse();
     const url = params.basePath
@@ -115,6 +120,7 @@ describe("handleControlUiHttpRequest", () => {
       {
         ...(params.basePath ? { basePath: params.basePath } : {}),
         ...(params.auth ? { auth: params.auth } : {}),
+        ...(params.config ? { config: params.config } : {}),
         root: { kind: "resolved", path: params.rootPath },
       },
     );
@@ -954,7 +960,9 @@ describe("handleControlUiHttpRequest", () => {
         const parsed = parseBootstrapPayload(end);
         expect(parsed.basePath).toBe("");
         expect(parsed.assistantName).toBe("</script><script>alert(1)//");
-        expect(parsed.assistantAvatar).toBe("/avatar/main");
+        expect(parsed.assistantAvatar).toBe("A");
+        expect(parsed.assistantAvatarStatus).toBe("none");
+        expect(parsed.assistantAvatarReason).toBe("missing");
         expect(parsed.assistantAgentId).toBe("main");
         expect(parsed.chatMessageMaxWidth).toBe("min(1280px, 82%)");
         expect(parsed.seamColor).toBe("#1A2b3C");
@@ -965,9 +973,40 @@ describe("handleControlUiHttpRequest", () => {
     });
   });
 
+  it("inlines a workspace-local assistant avatar as a data URI in bootstrap config (#97602)", async () => {
+    await withControlUiRoot({
+      fn: async (tmp) => {
+        // A real workspace-relative avatar file must be projected as an inline
+        // data URI so the Personal card <img> renders without hitting the
+        // auth-gated /avatar/<agentId> route.
+        await fs.writeFile(path.join(tmp, "avatar.png"), "avatar-bytes\n");
+        const { res, end } = makeMockHttpResponse();
+        const handled = await handleControlUiHttpRequest(
+          { url: CONTROL_UI_BOOTSTRAP_CONFIG_PATH, method: "GET" } as IncomingMessage,
+          res,
+          {
+            root: { kind: "resolved", path: tmp },
+            config: {
+              agents: { defaults: { workspace: tmp } },
+              ui: { assistant: { name: "Ops", avatar: "avatar.png" } },
+            },
+          },
+        );
+        expect(handled).toBe(true);
+        const parsed = parseBootstrapPayload(end);
+        expect(parsed).toMatchObject({
+          assistantAvatar: `data:image/png;base64,${Buffer.from("avatar-bytes\n").toString("base64")}`,
+          assistantAvatarSource: "avatar.png",
+          assistantAvatarStatus: "local",
+        });
+      },
+    });
+  });
+
   it("rejects bootstrap config requests without a valid auth token when auth is enabled", async () => {
     await withControlUiRoot({
       fn: async (tmp) => {
+        await fs.writeFile(path.join(tmp, "avatar.png"), "avatar-bytes\n");
         const { res, handled, end } = await runBootstrapConfigRequest({
           rootPath: tmp,
           auth: { mode: "token", token: "test-token", allowTailscale: false },
@@ -982,17 +1021,26 @@ describe("handleControlUiHttpRequest", () => {
   it("serves bootstrap config JSON when auth is enabled and the token is valid", async () => {
     await withControlUiRoot({
       fn: async (tmp) => {
+        await fs.writeFile(path.join(tmp, "avatar.png"), "avatar-bytes\n");
         const { res, handled, end } = await runBootstrapConfigRequest({
           rootPath: tmp,
           auth: { mode: "token", token: "test-token", allowTailscale: false },
           headers: {
             authorization: "Bearer test-token",
           },
+          config: {
+            agents: { defaults: { workspace: tmp } },
+            ui: { assistant: { avatar: "avatar.png" } },
+          },
         });
         expect(handled).toBe(true);
         expect(res.statusCode).toBe(200);
         const parsed = parseBootstrapPayload(end);
-        expect(parsed.assistantAgentId).toBe("main");
+        expect(parsed).toMatchObject({
+          assistantAgentId: "main",
+          assistantAvatar: `data:image/png;base64,${Buffer.from("avatar-bytes\n").toString("base64")}`,
+          assistantAvatarStatus: "local",
+        });
       },
     });
   });
@@ -1039,7 +1087,9 @@ describe("handleControlUiHttpRequest", () => {
         const parsed = parseBootstrapPayload(end);
         expect(parsed.basePath).toBe("/openclaw");
         expect(parsed.assistantName).toBe("Ops");
-        expect(parsed.assistantAvatar).toBe("/openclaw/avatar/main");
+        expect(parsed.assistantAvatar).toBe("A");
+        expect(parsed.assistantAvatarStatus).toBe("none");
+        expect(parsed.assistantAvatarReason).toBe("missing");
         expect(parsed.assistantAgentId).toBe("main");
         expect(Array.isArray(parsed.localMediaPreviewRoots)).toBe(true);
       },
diff --git a/src/gateway/control-ui.ts b/src/gateway/control-ui.ts
index 709ebbe515d0..a25d27e2503e 100644
--- a/src/gateway/control-ui.ts
+++ b/src/gateway/control-ui.ts
@@ -9,7 +9,7 @@ import {
   asDateTimestampMs,
   resolveTimestampMsToIsoString,
 } from "@openclaw/normalization-core/number-coercion";
-import { resolveAgentAvatar, resolvePublicAgentAvatarSource } from "../agents/identity-avatar.js";
+import { resolvePublicAgentAvatarSource } from "../agents/identity-avatar.js";
 import type { OpenClawConfig } from "../config/types.openclaw.js";
 import { matchRootFileOpenFailure, openRootFileSync } from "../infra/boundary-file-read.js";
 import {
@@ -31,7 +31,10 @@ import { extractOriginalFilename } from "../media/store.js";
 import { AVATAR_MAX_BYTES } from "../shared/avatar-policy.js";
 import { resolveUserPath } from "../utils.js";
 import { resolveRuntimeServiceVersion } from "../version.js";
-import { DEFAULT_ASSISTANT_IDENTITY, resolveAssistantIdentity } from "./assistant-identity.js";
+import {
+  DEFAULT_ASSISTANT_IDENTITY,
+  resolvePublicAssistantIdentity,
+} from "./assistant-identity.js";
 import {
   AUTH_RATE_LIMIT_SCOPE_DEVICE_TOKEN,
   AUTH_RATE_LIMIT_SCOPE_SHARED_SECRET,
@@ -55,7 +58,6 @@ import {
   buildControlUiAvatarUrl,
   CONTROL_UI_AVATAR_PREFIX,
   normalizeControlUiBasePath,
-  resolveAssistantAvatarUrl,
 } from "./control-ui-shared.js";
 import { buildMissingScopeForbiddenBody, sendGatewayAuthFailure } from "./http-common.js";
 import {
@@ -1011,18 +1013,13 @@ export async function handleControlUiHttpRequest(
     }
     const config = opts?.config;
     const identity = config
-      ? resolveAssistantIdentity({ cfg: config, agentId: opts?.agentId })
-      : DEFAULT_ASSISTANT_IDENTITY;
-    const avatarValue = resolveAssistantAvatarUrl({
-      avatar: identity.avatar,
-      agentId: identity.agentId,
-      basePath,
-    });
-    const avatarMeta = config
-      ? controlUiAvatarResolutionMeta(
-          resolveAgentAvatar(config, identity.agentId, { includeUiOverride: true }),
-        )
-      : controlUiAvatarResolutionMeta(null);
+      ? resolvePublicAssistantIdentity({ cfg: config, agentId: opts?.agentId, basePath })
+      : {
+          ...DEFAULT_ASSISTANT_IDENTITY,
+          avatarSource: undefined,
+          avatarStatus: undefined,
+          avatarReason: undefined,
+        };
     if (req.method === "HEAD") {
       res.statusCode = 200;
       res.setHeader("Content-Type", "application/json; charset=utf-8");
@@ -1033,10 +1030,10 @@ export async function handleControlUiHttpRequest(
     sendJson(res, 200, {
       basePath,
       assistantName: identity.name,
-      assistantAvatar: avatarValue ?? identity.avatar,
-      assistantAvatarSource: avatarMeta.avatarSource,
-      assistantAvatarStatus: avatarMeta.avatarStatus,
-      assistantAvatarReason: avatarMeta.avatarReason,
+      assistantAvatar: identity.avatar,
+      assistantAvatarSource: identity.avatarSource,
+      assistantAvatarStatus: identity.avatarStatus,
+      assistantAvatarReason: identity.avatarReason,
       assistantAgentId: identity.agentId,
       serverVersion: resolveRuntimeServiceVersion(process.env),
       localMediaPreviewRoots: [...getAgentScopedMediaLocalRoots(config ?? {}, identity.agentId)],
diff --git a/src/gateway/server-methods/agent.test.ts b/src/gateway/server-methods/agent.test.ts
index eb40dfbc3b7c..4897ab2ce05a 100644
--- a/src/gateway/server-methods/agent.test.ts
+++ b/src/gateway/server-methods/agent.test.ts
@@ -1,6 +1,7 @@
 // Agent method tests cover run/steer/reset/wait behavior, task/subagent state,
 // approval followups, lifecycle hooks, and emitted gateway events.
 import fs from "node:fs/promises";
+import path from "node:path";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { ErrorCodes } from "../../../packages/gateway-protocol/src/index.js";
 import type { readAcpSessionMeta } from "../../acp/runtime/session-meta.js";
@@ -7600,6 +7601,85 @@ describe("gateway agent handler", () => {
     expect(mockCallArg(respond, 0, 2)).toBeUndefined();
   });
 
+  it("returns workspace-relative avatars as data URLs in agent.identity.get", async () => {
+    await withTempDir({ prefix: "openclaw-agent-avatar-" }, async (workspace) => {
+      await fs.mkdir(path.join(workspace, "avatars"), { recursive: true });
+      await fs.writeFile(path.join(workspace, "avatars", "main.png"), "avatar", "utf8");
+      mocks.loadConfigReturn = {
+        agents: {
+          defaults: { workspace },
+          list: [{ id: "main", identity: { avatar: "avatars/main.png" } }],
+        },
+      };
+
+      const respond = await invokeAgentIdentityGet(
+        { sessionKey: "agent:main:main" },
+        { reqId: "5-avatar-data" },
+      );
+
+      expectRecordFields(mockCallArg(respond, 0, 1), {
+        agentId: "main",
+        avatar: `data:image/png;base64,${Buffer.from("avatar").toString("base64")}`,
+        avatarSource: "avatars/main.png",
+        avatarStatus: "local",
+      });
+    });
+  });
+
+  it.each([
+    ["remote", "https://example.com/avatar.png"],
+    ["data", "data:image/png;base64,aaaa"],
+    ["text", "PS"],
+  ] as const)("preserves %s avatar values in agent.identity.get", async (_kind, avatar) => {
+    mocks.loadConfigReturn = { ui: { assistant: { avatar } } };
+
+    const respond = await invokeAgentIdentityGet(
+      { sessionKey: "agent:main:main" },
+      { reqId: `5-avatar-${_kind}` },
+    );
+
+    expect((mockCallArg(respond, 0, 1) as { avatar?: unknown }).avatar).toBe(avatar);
+  });
+
+  it("prefixes same-origin avatar routes in agent.identity.get when Control UI has a base path", async () => {
+    mocks.loadConfigReturn = {
+      gateway: { controlUi: { basePath: "/openclaw" } },
+      ui: { assistant: { avatar: "/avatar/main" } },
+    };
+
+    const respond = await invokeAgentIdentityGet(
+      { sessionKey: "agent:main:main" },
+      { reqId: "5-avatar-route-base-path" },
+    );
+
+    expect((mockCallArg(respond, 0, 1) as { avatar?: unknown }).avatar).toBe(
+      "/openclaw/avatar/main",
+    );
+  });
+
+  it("replaces rejected local avatar paths with the default instead of a protected route", async () => {
+    await withTempDir({ prefix: "openclaw-agent-avatar-missing-" }, async (workspace) => {
+      mocks.loadConfigReturn = {
+        agents: {
+          defaults: { workspace },
+          list: [{ id: "main", identity: { avatar: "avatars/missing.png" } }],
+        },
+      };
+
+      const respond = await invokeAgentIdentityGet(
+        { sessionKey: "agent:main:main" },
+        { reqId: "5-avatar-missing" },
+      );
+
+      expectRecordFields(mockCallArg(respond, 0, 1), {
+        avatar: "A",
+        avatarSource: "avatars/missing.png",
+        avatarStatus: "none",
+        avatarReason: "missing",
+      });
+    });
+  });
+
   it("allows non-delivery agent invocations when sendPolicy is deny", async () => {
     mocks.agentCommand.mockClear();
     primeMainAgentRun();
diff --git a/src/gateway/server-methods/agent.ts b/src/gateway/server-methods/agent.ts
index 85698081e645..c487a941ed84 100644
--- a/src/gateway/server-methods/agent.ts
+++ b/src/gateway/server-methods/agent.ts
@@ -46,10 +46,6 @@ import {
   retainEmbeddedAgentRunAbortabilityForRunId,
 } from "../../agents/embedded-agent-runner/runs.js";
 import { isTimeoutError } from "../../agents/failover-error.js";
-import {
-  resolveAgentAvatar,
-  resolvePublicAgentAvatarSource,
-} from "../../agents/identity-avatar.js";
 import {
   AGENT_INTERNAL_EVENT_TYPE_TASK_COMPLETION,
   hasGeneratedMediaCompletionEvent,
@@ -162,7 +158,7 @@ import {
   normalizeMessageChannel,
 } from "../../utils/message-channel.js";
 import { setSafeTimeout } from "../../utils/timer-delay.js";
-import { resolveAssistantIdentity } from "../assistant-identity.js";
+import { resolvePublicAssistantIdentity } from "../assistant-identity.js";
 import {
   type ChatAbortControllerEntry,
   registerChatAbortController,
@@ -174,7 +170,6 @@ import {
   parseMessageWithAttachments,
   resolveChatAttachmentMaxBytes,
 } from "../chat-attachments.js";
-import { resolveAssistantAvatarUrl } from "../control-ui-shared.js";
 import { ADMIN_SCOPE } from "../method-scopes.js";
 import {
   emitGatewaySessionEndPluginHook,
@@ -3975,25 +3970,12 @@ export const agentHandlers: GatewayRequestHandlers = {
       agentId = resolved;
     }
     const cfg = context.getRuntimeConfig();
-    const identity = resolveAssistantIdentity({ cfg, agentId });
-    const avatarValue =
-      resolveAssistantAvatarUrl({
-        avatar: identity.avatar,
-        agentId: identity.agentId,
-        basePath: cfg.gateway?.controlUi?.basePath,
-      }) ?? identity.avatar;
-    const avatarResolution = resolveAgentAvatar(cfg, identity.agentId, { includeUiOverride: true });
-    respond(
-      true,
-      {
-        ...identity,
-        avatar: avatarValue,
-        avatarSource: resolvePublicAgentAvatarSource(avatarResolution),
-        avatarStatus: avatarResolution.kind,
-        avatarReason: avatarResolution.kind === "none" ? avatarResolution.reason : undefined,
-      },
-      undefined,
-    );
+    const identity = resolvePublicAssistantIdentity({
+      cfg,
+      agentId,
+      basePath: cfg.gateway?.controlUi?.basePath,
+    });
+    respond(true, identity, undefined);
   },
   "agent.wait": async ({ params, respond, context }) => {
     if (!validateAgentWaitParams(params)) {
diff --git a/src/gateway/session-utils.ts b/src/gateway/session-utils.ts
index ba3e3f8135aa..562ab2ccfa8c 100644
--- a/src/gateway/session-utils.ts
+++ b/src/gateway/session-utils.ts
@@ -1,7 +1,5 @@
 // Gateway session listing and projection helpers.
 // Normalizes persisted session stores into UI/RPC rows without mutating state.
-import fs from "node:fs";
-import path from "node:path";
 import {
   normalizeLowercaseStringOrEmpty,
   normalizeOptionalString,
@@ -26,6 +24,8 @@ import {
 import { lookupContextTokens, resolveContextTokensForModel } from "../agents/context.js";
 import { DEFAULT_CONTEXT_TOKENS, DEFAULT_MODEL, DEFAULT_PROVIDER } from "../agents/defaults.js";
 import { resolveFastModeState } from "../agents/fast-mode.js";
+import { resolveAgentAvatarFromSource } from "../agents/identity-avatar.js";
+import { resolveAgentAvatarUrl } from "../agents/identity-avatar-projection.js";
 import {
   findModelCatalogEntry,
   modelSupportsInput,
@@ -77,7 +77,6 @@ import {
 } from "../config/sessions.js";
 import { listSessionEntries as listAccessorSessionEntries } from "../config/sessions/session-accessor.js";
 import type { OpenClawConfig } from "../config/types.openclaw.js";
-import { openRootFileSync } from "../infra/boundary-file-read.js";
 import { projectPluginSessionExtensionsSync } from "../plugins/host-hook-state.js";
 import { withPinnedActivePluginRegistryWorkspaceDir } from "../plugins/runtime-workspace-state.js";
 import {
@@ -87,14 +86,6 @@ import {
   parseAgentSessionKey,
 } from "../routing/session-key.js";
 import { isAcpSessionKey, isCronRunSessionKey } from "../sessions/session-key-utils.js";
-import {
-  AVATAR_MAX_BYTES,
-  isAvatarDataUrl,
-  isAvatarHttpUrl,
-  isPathWithinRoot,
-  isWorkspaceRelativeAvatarPath,
-  resolveAvatarMime,
-} from "../shared/avatar-policy.js";
 import { resolveNonNegativeNumber } from "../shared/number-coercion.js";
 import { truncateUtf16Safe } from "../utils.js";
 import { normalizeSessionDeliveryFields } from "../utils/delivery-context.shared.js";
@@ -165,64 +156,6 @@ export {
 
 const DERIVED_TITLE_MAX_LEN = 60;
 
-function tryResolveExistingPath(value: string): string | null {
-  try {
-    return fs.realpathSync(value);
-  } catch {
-    return null;
-  }
-}
-
-function resolveIdentityAvatarUrl(
-  cfg: OpenClawConfig,
-  agentId: string,
-  avatar: string | undefined,
-): string | undefined {
-  if (!avatar) {
-    return undefined;
-  }
-  const trimmed = normalizeOptionalString(avatar) ?? "";
-  if (!trimmed) {
-    return undefined;
-  }
-  if (isAvatarDataUrl(trimmed) || isAvatarHttpUrl(trimmed)) {
-    return trimmed;
-  }
-  if (!isWorkspaceRelativeAvatarPath(trimmed)) {
-    return undefined;
-  }
-  const workspaceDir = resolveAgentWorkspaceDir(cfg, agentId);
-  const workspaceRoot = tryResolveExistingPath(workspaceDir) ?? path.resolve(workspaceDir);
-  const resolvedCandidate = path.resolve(workspaceRoot, trimmed);
-  if (!isPathWithinRoot(workspaceRoot, resolvedCandidate)) {
-    return undefined;
-  }
-  try {
-    // Avatars can be workspace-relative, but projection must keep the file
-    // read inside the agent workspace and cap bytes before encoding.
-    const opened = openRootFileSync({
-      absolutePath: resolvedCandidate,
-      rootPath: workspaceRoot,
-      rootRealPath: workspaceRoot,
-      boundaryLabel: "workspace root",
-      maxBytes: AVATAR_MAX_BYTES,
-      skipLexicalRootCheck: true,
-    });
-    if (!opened.ok) {
-      return undefined;
-    }
-    try {
-      const buffer = fs.readFileSync(opened.fd);
-      const mime = resolveAvatarMime(resolvedCandidate);
-      return `data:${mime};base64,${buffer.toString("base64")}`;
-    } finally {
-      fs.closeSync(opened.fd);
-    }
-  } catch {
-    return undefined;
-  }
-}
-
 function formatSessionIdPrefix(sessionId: string, updatedAt?: number | null): string {
   const prefix = sessionId.slice(0, 8);
   if (updatedAt && updatedAt > 0) {
@@ -1263,21 +1196,20 @@ export function listAgentsForGateway(
     if (!entry?.id) {
       continue;
     }
+    const agentId = normalizeAgentId(entry.id);
     const configuredName = normalizeOptionalString(entry.name);
+    const avatar = normalizeOptionalString(entry.identity?.avatar);
+    const avatarUrl = resolveAgentAvatarUrl(resolveAgentAvatarFromSource(cfg, agentId, avatar));
     const identity = entry.identity
       ? {
           name: normalizeOptionalString(entry.identity.name),
           theme: normalizeOptionalString(entry.identity.theme),
           emoji: normalizeOptionalString(entry.identity.emoji),
-          avatar: normalizeOptionalString(entry.identity.avatar),
-          avatarUrl: resolveIdentityAvatarUrl(
-            cfg,
-            normalizeAgentId(entry.id),
-            normalizeOptionalString(entry.identity.avatar),
-          ),
+          avatar,
+          avatarUrl,
         }
       : undefined;
-    configuredById.set(normalizeAgentId(entry.id), {
+    configuredById.set(agentId, {
       name: configuredName ?? identity?.name,
       identity,
     });
diff --git a/ui/src/lib/assistant-identity.test.ts b/ui/src/lib/assistant-identity.test.ts
index a15027915a61..454d32d3937f 100644
--- a/ui/src/lib/assistant-identity.test.ts
+++ b/ui/src/lib/assistant-identity.test.ts
@@ -2,6 +2,8 @@
 import { describe, expect, it } from "vitest";
 import { normalizeAssistantIdentity } from "./assistant-identity.ts";
 
+const AVATAR_MAX_DATA_URL_CHARS = 4 * Math.ceil((2 * 1024 * 1024) / 3) + 64;
+
 describe("normalizeAssistantIdentity", () => {
   it("truncates names without splitting a surrogate pair", () => {
     expect(normalizeAssistantIdentity({ name: `${"x".repeat(49)}🚀suffix` }).name).toBe(
@@ -17,6 +19,15 @@ describe("normalizeAssistantIdentity", () => {
     expect(normalizeAssistantIdentity({ avatar: dataUrl }).avatar).toBe(dataUrl);
   });
 
+  it("accepts the full local-avatar data URL bound and rejects larger values", () => {
+    const prefix = "data:image/svg+xml;base64,";
+    const bounded = prefix + "A".repeat(AVATAR_MAX_DATA_URL_CHARS - prefix.length);
+    const oversized = `${bounded}A`;
+
+    expect(normalizeAssistantIdentity({ avatar: bounded }).avatar).toBe(bounded);
+    expect(normalizeAssistantIdentity({ avatar: oversized }).avatar).toBeNull();
+  });
+
   it("preserves same-origin Control UI avatar routes", () => {
     expect(normalizeAssistantIdentity({ avatar: "/avatar/main" }).avatar).toBe("/avatar/main");
   });
diff --git a/ui/src/lib/assistant-identity.ts b/ui/src/lib/assistant-identity.ts
index fcc91d0be870..42a1c8702b7f 100644
--- a/ui/src/lib/assistant-identity.ts
+++ b/ui/src/lib/assistant-identity.ts
@@ -5,10 +5,10 @@ import { normalizeOptionalString } from "./string-coerce.ts";
 // Short text/emoji avatars (e.g. "A", "PS", "🦞"). Anything longer that is not
 // a renderable image URL is dropped during normalization.
 const MAX_ASSISTANT_TEXT_AVATAR = 64;
+// Mirrors server AVATAR_MAX_BYTES expansion without importing Node-only avatar policy.
+const AVATAR_MAX_DATA_URL_CHARS = 4 * Math.ceil((2 * 1024 * 1024) / 3) + 64;
 const ASSISTANT_IDENTITY_LIMITS = {
   name: 50,
-  // Image-bearing avatars use the local-user image cap so uploads round-trip.
-  avatar: 2_000_000,
   avatarSource: 500,
   avatarReason: 200,
 } as const;
@@ -38,12 +38,14 @@ function normalizeAssistantValue(
 }
 
 function normalizeAssistantAvatar(value: string | null | undefined): string | null {
-  const trimmed = normalizeAssistantValue("avatar", value);
+  const trimmed = normalizeOptionalString(value);
   if (!trimmed) {
     return null;
   }
   if (RENDERABLE_AVATAR_URL_RE.test(trimmed)) {
-    return trimmed;
+    // Reject instead of truncating: a truncated data URL still looks valid but
+    // decodes to a broken image.
+    return trimmed.length <= AVATAR_MAX_DATA_URL_CHARS ? trimmed : null;
   }
   if (/[\r\n]/.test(trimmed)) {
     return null;