diff --git a/hermes_cli/dashboard_auth/middleware.py b/hermes_cli/dashboard_auth/middleware.py
index caa1b3a6e5d..5c029cac62d 100644
--- a/hermes_cli/dashboard_auth/middleware.py
+++ b/hermes_cli/dashboard_auth/middleware.py
@@ -53,6 +53,7 @@ _GATE_PUBLIC_PREFIXES: tuple[str, ...] = (
     "/auth/logout",
     "/login",
     "/api/auth/providers",
+    "/api/mcp/oauth/callback/",
     "/assets/",
     "/favicon.ico",
     "/ds-assets/",
diff --git a/hermes_cli/web_server.py b/hermes_cli/web_server.py
index a50f615d60a..0b9d8d9f884 100644
--- a/hermes_cli/web_server.py
+++ b/hermes_cli/web_server.py
@@ -587,7 +587,8 @@ async def auth_middleware(request: Request, call_next):
     if getattr(request.app.state, "auth_required", False):
         return await call_next(request)
     path = request.url.path
-    if path.startswith("/api/") and path not in _PUBLIC_API_PATHS:
+    is_mcp_oauth_callback = path.startswith("/api/mcp/oauth/callback/")
+    if path.startswith("/api/") and path not in _PUBLIC_API_PATHS and not is_mcp_oauth_callback:
         if not _has_valid_session_token(request) and not _has_valid_query_token(request, path):
             return JSONResponse(
                 status_code=401,
@@ -11325,98 +11326,73 @@ async def test_mcp_server(name: str, profile: Optional[str] = None):
     }
 
 
-@app.post("/api/mcp/servers/{name}/auth")
-async def auth_mcp_server(name: str, profile: Optional[str] = None):
-    """Run the OAuth flow for an HTTP MCP server (opens the system browser).
+_MCP_DASHBOARD_OAUTH_TTL = 15 * 60
+_mcp_oauth_flows: dict[str, "DashboardOAuthFlow"] = {}
 
-    Mirrors ``hermes mcp login``: wipe cached OAuth state so the probe forces
-    a fresh browser flow, connect, then verify a token actually landed on disk
-    (some providers serve tools/list unauthenticated — see
-    ``_reauth_oauth_server``).  Blocks until the browser flow completes, so it
-    runs in a worker thread.  ``auth: oauth`` is persisted only on success.
-    """
+
+def _gc_mcp_oauth_flows() -> None:
+    cutoff = time.time() - _MCP_DASHBOARD_OAUTH_TTL
+    stale = [
+        flow_id
+        for flow_id, flow in _mcp_oauth_flows.items()
+        if getattr(flow, "created_at", 0) < cutoff
+    ]
+    for flow_id in stale:
+        _mcp_oauth_flows.pop(flow_id, None)
+
+
+def _mcp_oauth_callback_url(request: Request, flow_id: str) -> str:
+    """Build the externally reachable callback URL for a dashboard flow."""
+    from urllib.parse import urlparse, urlunparse
+
+    from hermes_cli.dashboard_auth.prefix import prefix_from_request, resolve_public_url
+
+    suffix = f"/api/mcp/oauth/callback/{flow_id}"
+    public_url = resolve_public_url()
+    if public_url:
+        return f"{public_url}{suffix}"
+    base = urlparse(str(request.base_url))
+    prefix = prefix_from_request(request)
+    return urlunparse(base._replace(path=f"{prefix}{suffix}", params="", query="", fragment=""))
+
+
+def _run_dashboard_mcp_oauth(flow, cfg: dict) -> None:
+    """Run the normal MCP probe with dashboard redirect/callback handlers."""
     from hermes_cli.mcp_config import (
-        _get_mcp_servers,
         _oauth_tokens_present,
         _probe_single_server,
         _save_mcp_server,
     )
-
-    with _profile_scope(profile):
-        servers = _get_mcp_servers()
-    if name not in servers:
-        raise HTTPException(status_code=404, detail=f"Server '{name}' not found")
-
-    cfg = dict(servers[name])
-    if not cfg.get("url"):
-        raise HTTPException(
-            status_code=400,
-            detail="stdio servers authenticate via env keys, not OAuth",
-        )
-    # A server carrying `headers` uses API-key/bearer auth; a 401 there is a bad
-    # key, not an OAuth prompt. Refuse rather than rewrite it to `auth: oauth`
-    # and corrupt a working header-auth config. (Explicit `auth: oauth` is fine.)
-    if cfg.get("headers") and cfg.get("auth") != "oauth":
-        raise HTTPException(
-            status_code=400,
-            detail="This server uses header/API-key auth, not OAuth — check its key.",
-        )
-    cfg["auth"] = "oauth"
-
-    def _run():
+    try:
+        from tools.mcp_dashboard_oauth import dashboard_oauth_flow
         from tools.mcp_oauth import HermesTokenStorage, force_interactive_oauth
+        from tools.mcp_oauth_manager import get_manager
 
-        # Home-only scope, not _profile_scope: this blocks on the browser flow
-        # for up to minutes; holding the shared skills lock that whole time
-        # would freeze every other endpoint. Config writes here (_save_mcp_server)
-        # resolve HERMES_HOME via the contextvar override, which is all they need.
-        with _config_profile_scope(profile), force_interactive_oauth():
-            storage = HermesTokenStorage(name)
-            # Snapshot before clearing: a re-auth wipes cached state to force a
-            # fresh consent, but if the flow fails we must NOT leave the user
-            # worse off than before — restore the working token on any failure.
+        with (
+            _config_profile_scope(flow.profile),
+            force_interactive_oauth(),
+            dashboard_oauth_flow(flow),
+        ):
+            storage = HermesTokenStorage(flow.server_name)
             backup = storage.snapshot()
             try:
-                from tools.mcp_oauth_manager import get_manager
-
-                get_manager().remove(name)
-            except Exception:
-                pass  # No cached state to clear — fine.
-            try:
-                # The default 30s connect timeout would kill the flow while the
-                # user is still on the consent screen — give the browser
-                # round-trip the full callback window (300s in mcp_oauth) plus
-                # headroom so the connect wrapper can't pre-empt it. Honor a
-                # larger configured connect_timeout when the user set one.
-                try:
-                    _cfg_timeout = float(cfg.get("connect_timeout", 0))
-                except (TypeError, ValueError):
-                    _cfg_timeout = 0.0
+                get_manager().remove(flow.server_name)
                 tools = _probe_single_server(
-                    name, cfg, connect_timeout=max(_cfg_timeout, 315)
+                    flow.server_name,
+                    cfg,
+                    connect_timeout=max(float(cfg.get("connect_timeout", 0) or 0), 315),
                 )
+                if not _oauth_tokens_present(flow.server_name):
+                    raise RuntimeError(
+                        "The server responded, but no OAuth token was obtained — "
+                        "this provider may require a manually-registered OAuth client."
+                    )
+                _save_mcp_server(flow.server_name, cfg)
+                flow.tools = [{"name": t, "description": d} for t, d in tools]
+                flow.mark_approved()
             except Exception:
                 storage.restore(backup)
                 raise
-            if not _oauth_tokens_present(name):
-                storage.restore(backup)
-                return {
-                    "ok": False,
-                    "error": (
-                        "The server responded, but no OAuth token was obtained — "
-                        "this provider may require a manually-registered OAuth "
-                        "client (see `hermes mcp login`)."
-                    ),
-                    "tools": [],
-                }
-            _save_mcp_server(name, cfg)
-            return {
-                "ok": True,
-                "tools": [{"name": t, "description": d} for t, d in tools],
-            }
-
-    try:
-        return await asyncio.to_thread(_run)
     except Exception as exc:
         msg = str(exc)
         # Providers that gate RFC 7591 registration to pre-approved clients
@@ -11426,13 +11402,95 @@ async def auth_mcp_server(name: str, profile: Optional[str] = None):
         lowered = msg.lower()
         if "403" in msg and ("regist" in lowered or "forbidden" in lowered):
             msg = (
-                f"'{name}' only allows pre-approved OAuth clients — it rejected "
+                f"'{flow.server_name}' only allows pre-approved OAuth clients — it rejected "
                 "client registration (403), so no browser flow can start. "
                 "Options: add a pre-registered client to this server's entry "
                 "(oauth: {client_id: ..., client_secret: ...}), or use the "
                 "provider's stdio / API-key server instead."
             )
-        return {"ok": False, "error": msg, "tools": []}
+        flow.mark_error(msg)
+    finally:
+        # Dashboard auth builds a provider with a public callback URI and bridge
+        # handlers. Evict that one-shot provider after completion; persisted
+        # tokens/client registration remain for the normal runtime rebuild.
+        try:
+            from tools.mcp_oauth_manager import get_manager
+
+            get_manager().evict(flow.server_name)
+        except Exception:
+            pass
+
+
+@app.post("/api/mcp/servers/{name}/auth")
+async def auth_mcp_server(name: str, request: Request, profile: Optional[str] = None):
+    """Start MCP OAuth and hand the authorization URL to the dashboard browser."""
+    from hermes_cli.mcp_config import _get_mcp_servers
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow
+
+    _require_token(request)
+    _gc_mcp_oauth_flows()
+    with _profile_scope(profile):
+        servers = _get_mcp_servers()
+    if name not in servers:
+        raise HTTPException(status_code=404, detail=f"Server '{name}' not found")
+    cfg = dict(servers[name])
+    if not cfg.get("url"):
+        raise HTTPException(status_code=400, detail="stdio servers authenticate via env keys, not OAuth")
+    if cfg.get("headers") and cfg.get("auth") != "oauth":
+        raise HTTPException(status_code=400, detail="This server uses header/API-key auth, not OAuth")
+    cfg["auth"] = "oauth"
+
+    flow_id = secrets.token_urlsafe(24)
+    flow = DashboardOAuthFlow(
+        flow_id=flow_id,
+        server_name=name,
+        profile=profile,
+        redirect_uri=_mcp_oauth_callback_url(request, flow_id),
+    )
+    _mcp_oauth_flows[flow_id] = flow
+    threading.Thread(
+        target=_run_dashboard_mcp_oauth,
+        args=(flow, cfg),
+        daemon=True,
+        name=f"mcp-oauth-{name}",
+    ).start()
+    try:
+        await flow.wait_for_authorization_url(timeout=30)
+    except Exception as exc:
+        flow.mark_error(str(exc))
+    return flow.snapshot()
+
+
+@app.get("/api/mcp/oauth/flows/{flow_id}")
+async def mcp_oauth_flow_status(flow_id: str, request: Request):
+    _require_token(request)
+    _gc_mcp_oauth_flows()
+    flow = _mcp_oauth_flows.get(flow_id)
+    if flow is None:
+        raise HTTPException(status_code=404, detail="OAuth flow not found or expired")
+    snapshot = flow.snapshot()
+    snapshot["tools"] = flow.tools
+    return snapshot
+
+
+@app.get("/api/mcp/oauth/callback/{flow_id}")
+async def mcp_oauth_callback(
+    flow_id: str,
+    code: Optional[str] = None,
+    state: Optional[str] = None,
+    error: Optional[str] = None,
+):
+    _gc_mcp_oauth_flows()
+    flow = _mcp_oauth_flows.get(flow_id)
+    if flow is None:
+        return HTMLResponse("<h1>OAuth flow expired</h1><p>Return to Hermes and try again.</p>", status_code=404)
+    try:
+        flow.deliver_callback(code=code, state=state, error=error)
+    except ValueError as exc:
+        return HTMLResponse("<h1>OAuth callback rejected</h1><p>The callback was already used.</p>", status_code=409)
+    if error:
+        return HTMLResponse("<h1>Authorization failed</h1><p>Return to Hermes for details.</p>", status_code=400)
+    return HTMLResponse("<h1>Authorization received</h1><p>You can close this tab and return to Hermes.</p>")
 
 
 class MCPEnabledToggle(BaseModel):
diff --git a/tests/hermes_cli/test_mcp_dashboard_oauth.py b/tests/hermes_cli/test_mcp_dashboard_oauth.py
new file mode 100644
index 00000000000..b569fd70b88
--- /dev/null
+++ b/tests/hermes_cli/test_mcp_dashboard_oauth.py
@@ -0,0 +1,120 @@
+"""Dashboard HTTP contract for hosted MCP OAuth."""
+
+from unittest.mock import patch
+
+import pytest
+
+
+def _client():
+    from starlette.testclient import TestClient
+
+    from hermes_cli.web_server import app, _SESSION_HEADER_NAME, _SESSION_TOKEN
+
+    client = TestClient(app)
+    client.headers[_SESSION_HEADER_NAME] = _SESSION_TOKEN
+    return client
+
+
+@pytest.fixture(autouse=True)
+def _clear_flows():
+    from hermes_cli import web_server
+
+    web_server._mcp_oauth_flows.clear()
+    yield
+    web_server._mcp_oauth_flows.clear()
+
+
+def test_hosted_auth_start_returns_public_authorization_url(monkeypatch):
+    from hermes_cli import web_server
+
+    client = _client()
+    client.post(
+        "/api/mcp/servers",
+        json={"name": "reports", "url": "https://mcp.example/mcp", "auth": "oauth"},
+    )
+
+    def fake_worker(flow, cfg):
+        import asyncio
+
+        asyncio.run(flow.publish_authorization_url("https://idp.example/authorize?state=s1"))
+
+    monkeypatch.setattr(web_server, "_run_dashboard_mcp_oauth", fake_worker)
+    with patch(
+        "hermes_cli.dashboard_auth.prefix.resolve_public_url",
+        return_value="https://agent.example",
+    ):
+        response = client.post("/api/mcp/servers/reports/auth")
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["status"] == "authorization_required"
+    assert body["authorization_url"] == "https://idp.example/authorize?state=s1"
+    flow = web_server._mcp_oauth_flows[body["flow_id"]]
+    assert flow.redirect_uri == f"https://agent.example/api/mcp/oauth/callback/{body['flow_id']}"
+
+
+def test_hosted_callback_is_public_and_delivers_code():
+    from hermes_cli import web_server
+    from hermes_cli.dashboard_auth.public_paths import PUBLIC_API_PATHS
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow
+
+    flow = DashboardOAuthFlow(
+        flow_id="flow-public",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/api/mcp/oauth/callback/flow-public",
+    )
+    web_server._mcp_oauth_flows[flow.flow_id] = flow
+
+    assert "/api/mcp/oauth/callback" not in PUBLIC_API_PATHS
+    response = _client().get(
+        "/api/mcp/oauth/callback/flow-public?code=abc&state=expected"
+    )
+    assert response.status_code == 200
+    assert flow._callback == ("abc", "expected")
+
+
+def test_hosted_callback_bypasses_gated_cookie_auth(monkeypatch):
+    from starlette.testclient import TestClient
+
+    from hermes_cli import web_server
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow
+
+    flow = DashboardOAuthFlow(
+        flow_id="flow-gated",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/api/mcp/oauth/callback/flow-gated",
+    )
+    web_server._mcp_oauth_flows[flow.flow_id] = flow
+    monkeypatch.setattr(web_server.app.state, "auth_required", True, raising=False)
+
+    response = TestClient(web_server.app).get(
+        "/api/mcp/oauth/callback/flow-gated?code=abc&state=expected"
+    )
+
+    assert response.status_code == 200
+    assert flow._callback == ("abc", "expected")
+
+
+def test_flow_status_does_not_expose_authorization_code():
+    from hermes_cli import web_server
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow
+
+    flow = DashboardOAuthFlow(
+        flow_id="flow-status",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/api/mcp/oauth/callback/flow-status",
+    )
+    flow.authorization_url = "https://idp.example/authorize"
+    flow.status = "approved"
+    flow._callback = ("secret-code", "secret-state")
+    web_server._mcp_oauth_flows[flow.flow_id] = flow
+
+    response = _client().get("/api/mcp/oauth/flows/flow-status")
+    assert response.status_code == 200
+    body = response.json()
+    assert body["status"] == "approved"
+    assert "secret-code" not in response.text
+    assert "secret-state" not in response.text
diff --git a/tests/tools/test_mcp_dashboard_oauth.py b/tests/tools/test_mcp_dashboard_oauth.py
new file mode 100644
index 00000000000..35976d4e965
--- /dev/null
+++ b/tests/tools/test_mcp_dashboard_oauth.py
@@ -0,0 +1,131 @@
+"""Hosted-dashboard bridge for MCP OAuth browser callbacks."""
+
+import asyncio
+
+import pytest
+
+
+def test_dashboard_flow_exposes_authorization_url_and_accepts_callback():
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow
+
+    flow = DashboardOAuthFlow(
+        flow_id="flow-1",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/mcp/oauth/callback/flow-1",
+    )
+
+    asyncio.run(flow.publish_authorization_url("https://idp.example/authorize?state=s1"))
+    assert flow.snapshot() == {
+        "flow_id": "flow-1",
+        "server_name": "reports",
+        "status": "authorization_required",
+        "authorization_url": "https://idp.example/authorize?state=s1",
+        "error": None,
+    }
+
+    flow.deliver_callback(code="code-1", state="s1", error=None)
+    assert asyncio.run(flow.wait_for_callback()) == ("code-1", "s1")
+
+
+def test_dashboard_flow_rejects_second_callback():
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow
+
+    flow = DashboardOAuthFlow(
+        flow_id="flow-2",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/mcp/oauth/callback/flow-2",
+    )
+    flow.deliver_callback(code="first", state="state", error=None)
+    with pytest.raises(ValueError, match="already received"):
+        flow.deliver_callback(code="second", state="state", error=None)
+
+
+def test_dashboard_context_overrides_redirect_and_handlers():
+    from tools.mcp_dashboard_oauth import (
+        DashboardOAuthFlow,
+        dashboard_oauth_flow,
+        get_dashboard_oauth_flow,
+    )
+
+    flow = DashboardOAuthFlow(
+        flow_id="flow-3",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/mcp/oauth/callback/flow-3",
+    )
+    assert get_dashboard_oauth_flow() is None
+    with dashboard_oauth_flow(flow):
+        assert get_dashboard_oauth_flow() is flow
+    assert get_dashboard_oauth_flow() is None
+
+
+def test_mcp_oauth_helpers_use_dashboard_flow_without_loopback_port():
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow, dashboard_oauth_flow
+    from tools.mcp_oauth import (
+        HermesTokenStorage,
+        _build_client_metadata,
+        _configure_callback_port,
+        _make_callback_waiter,
+        _make_redirect_handler,
+    )
+
+    flow = DashboardOAuthFlow(
+        flow_id="flow-4",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/mcp/oauth/callback/flow-4",
+    )
+    cfg = {}
+    with dashboard_oauth_flow(flow):
+        assert _configure_callback_port(cfg, HermesTokenStorage("reports")) == 0
+        metadata = _build_client_metadata(cfg)
+        assert str(metadata.redirect_uris[0]) == flow.redirect_uri
+
+        asyncio.run(_make_redirect_handler(0)("https://idp.example/authorize"))
+        flow.deliver_callback(code="code-4", state="state-4", error=None)
+        assert asyncio.run(_make_callback_waiter(0)()) == ("code-4", "state-4")
+
+    assert flow.authorization_url == "https://idp.example/authorize"
+
+
+def test_manager_build_allows_dashboard_flow_without_tty(tmp_path, monkeypatch):
+    from tools.mcp_dashboard_oauth import DashboardOAuthFlow, dashboard_oauth_flow
+    from tools.mcp_oauth_manager import MCPOAuthManager
+
+    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+    monkeypatch.setattr("tools.mcp_oauth.sys.stdin.isatty", lambda: False)
+    flow = DashboardOAuthFlow(
+        flow_id="flow-5",
+        server_name="reports",
+        profile=None,
+        redirect_uri="https://agent.example/api/mcp/oauth/callback/flow-5",
+    )
+    with dashboard_oauth_flow(flow):
+        provider = MCPOAuthManager().get_or_build_provider(
+            "reports", "https://mcp.example/mcp", {}
+        )
+    assert provider is not None
+    assert str(provider.context.client_metadata.redirect_uris[0]) == flow.redirect_uri
+
+
+def test_manager_evict_preserves_persisted_oauth_state(tmp_path, monkeypatch):
+    from tools.mcp_oauth import HermesTokenStorage
+    from tools.mcp_oauth_manager import MCPOAuthManager, _ProviderEntry
+
+    monkeypatch.setenv("HERMES_HOME", str(tmp_path))
+    storage = HermesTokenStorage("reports")
+    storage._tokens_path().parent.mkdir(parents=True)
+    storage._tokens_path().write_text(
+        '{"access_token":"a","token_type":"Bearer"}'
+    )
+    manager = MCPOAuthManager()
+    manager._entries["reports"] = _ProviderEntry(
+        server_url="https://mcp.example/mcp", oauth_config={}
+    )
+
+    manager.evict("reports")
+
+    assert "reports" not in manager._entries
+    assert storage._tokens_path().exists()
diff --git a/tools/mcp_dashboard_oauth.py b/tools/mcp_dashboard_oauth.py
new file mode 100644
index 00000000000..d436066544c
--- /dev/null
+++ b/tools/mcp_dashboard_oauth.py
@@ -0,0 +1,110 @@
+"""Dashboard-mediated callback bridge for MCP OAuth.
+
+The MCP SDK remains responsible for discovery, DCR, PKCE, state validation and
+token exchange. This module only moves the two human/browser callbacks from a
+loopback listener into the already-authenticated dashboard session.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import contextvars
+import threading
+import time
+from contextlib import contextmanager
+from dataclasses import dataclass, field
+from typing import Iterator
+
+
+@dataclass
+class DashboardOAuthFlow:
+    flow_id: str
+    server_name: str
+    profile: str | None
+    redirect_uri: str
+    created_at: float = field(default_factory=time.time)
+    status: str = "starting"
+    authorization_url: str | None = None
+    error: str | None = None
+    tools: list[dict] = field(default_factory=list)
+    _callback: tuple[str, str | None] | None = field(default=None, init=False, repr=False)
+    _callback_error: str | None = field(default=None, init=False, repr=False)
+    _authorization_ready: threading.Event = field(default_factory=threading.Event, init=False, repr=False)
+    _callback_ready: threading.Event = field(default_factory=threading.Event, init=False, repr=False)
+
+    async def publish_authorization_url(self, url: str) -> None:
+        self.authorization_url = url
+        self.status = "authorization_required"
+        self._authorization_ready.set()
+
+    async def wait_for_authorization_url(self, timeout: float = 30.0) -> str:
+        ready = await asyncio.to_thread(self._authorization_ready.wait, timeout)
+        if not ready:
+            raise TimeoutError("Timed out waiting for MCP authorization URL")
+        if not self.authorization_url:
+            raise RuntimeError(self.error or "MCP OAuth flow ended before authorization")
+        return self.authorization_url
+
+    def deliver_callback(
+        self,
+        *,
+        code: str | None,
+        state: str | None,
+        error: str | None,
+    ) -> None:
+        if self._callback_ready.is_set():
+            raise ValueError("OAuth callback already received")
+        if error:
+            self._callback_error = error
+        elif code:
+            self._callback = (code, state)
+        else:
+            self._callback_error = "OAuth callback did not include code or error"
+        self._callback_ready.set()
+
+    async def wait_for_callback(self, timeout: float = 300.0) -> tuple[str, str | None]:
+        ready = await asyncio.to_thread(self._callback_ready.wait, timeout)
+        if not ready:
+            raise TimeoutError("Timed out waiting for MCP OAuth callback")
+        if self._callback_error:
+            raise RuntimeError(f"OAuth authorization failed: {self._callback_error}")
+        if self._callback is None:
+            raise RuntimeError("OAuth callback did not include an authorization code")
+        return self._callback
+
+    def mark_approved(self) -> None:
+        self.status = "approved"
+        self.error = None
+
+    def mark_error(self, error: str) -> None:
+        self.status = "error"
+        self.error = error
+        self._authorization_ready.set()
+        self._callback_ready.set()
+
+    def snapshot(self) -> dict:
+        return {
+            "flow_id": self.flow_id,
+            "server_name": self.server_name,
+            "status": self.status,
+            "authorization_url": self.authorization_url,
+            "error": self.error,
+        }
+
+
+_current_dashboard_flow: contextvars.ContextVar[DashboardOAuthFlow | None] = (
+    contextvars.ContextVar("mcp_dashboard_oauth_flow", default=None)
+)
+
+
+@contextmanager
+def dashboard_oauth_flow(flow: DashboardOAuthFlow) -> Iterator[None]:
+    token = _current_dashboard_flow.set(flow)
+    try:
+        yield
+    finally:
+        _current_dashboard_flow.reset(token)
+
+
+def get_dashboard_oauth_flow() -> DashboardOAuthFlow | None:
+    return _current_dashboard_flow.get()
diff --git a/tools/mcp_oauth.py b/tools/mcp_oauth.py
index 7959852319f..e50fcbc9c2f 100644
--- a/tools/mcp_oauth.py
+++ b/tools/mcp_oauth.py
@@ -630,6 +630,13 @@ def _make_redirect_handler(port: int, redirect_uri: str | None = None):
         Opens the browser automatically when possible; always prints the URL
         as a fallback for headless/SSH/gateway environments.
         """
+        from tools.mcp_dashboard_oauth import get_dashboard_oauth_flow
+
+        dashboard_flow = get_dashboard_oauth_flow()
+        if dashboard_flow is not None:
+            await dashboard_flow.publish_authorization_url(authorization_url)
+            return
+
         # Fail fast at the authorization boundary in non-interactive contexts
         # (systemd gateway, cron, background MCP discovery). A cached-but-unusable
         # token (expired/revoked, refresh rejected) makes the SDK fall through to
@@ -743,6 +750,12 @@ def _make_callback_waiter(port: int):
     """
 
     async def _wait() -> tuple[str, str | None]:
+        from tools.mcp_dashboard_oauth import get_dashboard_oauth_flow
+
+        dashboard_flow = get_dashboard_oauth_flow()
+        if dashboard_flow is not None:
+            return await dashboard_flow.wait_for_callback()
+
         # Reject before binding the callback listener in non-interactive
         # contexts. Reaching here means the SDK entered the authorization-code
         # flow (a valid or refreshable token would never call the callback
@@ -972,6 +985,13 @@ def _configure_callback_port(
     consolidation PR.
     """
     global _oauth_port
+    from tools.mcp_dashboard_oauth import get_dashboard_oauth_flow
+
+    dashboard_flow = get_dashboard_oauth_flow()
+    if dashboard_flow is not None:
+        cfg["_resolved_port"] = 0
+        cfg["redirect_uri"] = dashboard_flow.redirect_uri
+        return 0
     requested = int(cfg.get("redirect_port", 0))
     # Precedence: explicit config port → cached client-registration port →
     # fresh ephemeral port. The cached port keeps re-auth consistent with the
diff --git a/tools/mcp_oauth_manager.py b/tools/mcp_oauth_manager.py
index f4a37683ff6..087a1af91a9 100644
--- a/tools/mcp_oauth_manager.py
+++ b/tools/mcp_oauth_manager.py
@@ -532,7 +532,13 @@ class MCPOAuthManager:
         cfg = dict(entry.oauth_config or {})
         storage = HermesTokenStorage(server_name)
 
-        if not _is_interactive() and not storage.has_cached_tokens():
+        from tools.mcp_dashboard_oauth import get_dashboard_oauth_flow
+
+        if (
+            get_dashboard_oauth_flow() is None
+            and not _is_interactive()
+            and not storage.has_cached_tokens()
+        ):
             raise OAuthNonInteractiveError(
                 "MCP OAuth for "
                 f"'{server_name}': non-interactive environment and no "
@@ -576,6 +582,11 @@ class MCPOAuthManager:
             server_name,
         )
 
+    def evict(self, server_name: str) -> None:
+        """Drop only the in-process provider, preserving persisted OAuth state."""
+        with self._entries_lock:
+            self._entries.pop(server_name, None)
+
     # -- Disk watch ----------------------------------------------------------
 
     async def invalidate_if_disk_changed(self, server_name: str) -> bool:
diff --git a/tools/mcp_tool.py b/tools/mcp_tool.py
index 4438a715718..b0c1b976bcf 100644
--- a/tools/mcp_tool.py
+++ b/tools/mcp_tool.py
@@ -3775,6 +3775,27 @@ def _wrap_with_home_override(coro: "Coroutine") -> "Coroutine":
     return _scoped()
 
 
+def _wrap_with_dashboard_oauth_flow(coro):
+    """Propagate a dashboard OAuth flow onto the dedicated MCP loop task."""
+    try:
+        from tools.mcp_dashboard_oauth import (
+            dashboard_oauth_flow,
+            get_dashboard_oauth_flow,
+        )
+
+        flow = get_dashboard_oauth_flow()
+    except Exception:
+        return coro
+    if flow is None:
+        return coro
+
+    async def _scoped():
+        with dashboard_oauth_flow(flow):
+            return await coro
+
+    return _scoped()
+
+
 def _run_on_mcp_loop(coro_or_factory, timeout: float = 30):
     """Schedule a coroutine on the MCP event loop and block until done.
 
@@ -3809,6 +3830,7 @@ def _run_on_mcp_loop(coro_or_factory, timeout: float = 30):
     # task's own context (task-local — concurrent calls carrying different
     # scopes don't interfere). No-op when no override is active.
     coro = _wrap_with_home_override(coro)
+    coro = _wrap_with_dashboard_oauth_flow(coro)
 
     future = safe_schedule_threadsafe(
         coro, loop,
diff --git a/web/src/lib/api.ts b/web/src/lib/api.ts
index 2691b577d22..114b2c89576 100644
--- a/web/src/lib/api.ts
+++ b/web/src/lib/api.ts
@@ -996,10 +996,14 @@ export const api = {
       body: JSON.stringify(body),
     }),
   authMcpServer: (name: string) =>
-    fetchJSON<McpTestResult>(
+    fetchJSON<McpOAuthFlow>(
       `/api/mcp/servers/${encodeURIComponent(name)}/auth`,
       { method: "POST" },
     ),
+  getMcpOAuthFlow: (flowId: string) =>
+    fetchJSON<McpOAuthFlow>(
+      `/api/mcp/oauth/flows/${encodeURIComponent(flowId)}`,
+    ),
   removeMcpServer: (name: string) =>
     fetchJSON<{ ok: boolean }>(`/api/mcp/servers/${encodeURIComponent(name)}`, {
       method: "DELETE",
@@ -1465,6 +1469,15 @@ export interface McpTestResult {
   tools: Array<{ name: string; description: string }>;
 }
 
+export interface McpOAuthFlow {
+  flow_id: string;
+  server_name: string;
+  status: "starting" | "authorization_required" | "approved" | "error";
+  authorization_url: string | null;
+  error: string | null;
+  tools?: Array<{ name: string; description: string }>;
+}
+
 export interface MessagingPlatformEnvVar {
   key: string;
   required: boolean;
diff --git a/web/src/lib/mcp-dashboard-oauth.test.ts b/web/src/lib/mcp-dashboard-oauth.test.ts
new file mode 100644
index 00000000000..7de079e0c04
--- /dev/null
+++ b/web/src/lib/mcp-dashboard-oauth.test.ts
@@ -0,0 +1,84 @@
+import { describe, expect, it, vi } from "vitest";
+import { completeMcpDashboardOAuth } from "./mcp-dashboard-oauth";
+
+describe("completeMcpDashboardOAuth", () => {
+  it("opens the authorization URL in the dashboard browser and polls to approval", async () => {
+    const authWindow = { location: { href: "" }, opener: {} } as unknown as Window;
+    const open = vi.fn().mockReturnValue(authWindow);
+    const start = vi.fn().mockResolvedValue({
+      flow_id: "flow-1",
+      server_name: "reports",
+      status: "authorization_required",
+      authorization_url: "https://idp.example/authorize",
+      error: null,
+    });
+    const status = vi
+      .fn()
+      .mockResolvedValueOnce({
+        flow_id: "flow-1",
+        server_name: "reports",
+        status: "authorization_required",
+        authorization_url: "https://idp.example/authorize",
+        error: null,
+        tools: [],
+      })
+      .mockResolvedValueOnce({
+        flow_id: "flow-1",
+        server_name: "reports",
+        status: "approved",
+        authorization_url: "https://idp.example/authorize",
+        error: null,
+        tools: [{ name: "list_reports", description: "List reports" }],
+      });
+
+    const result = await completeMcpDashboardOAuth({
+      serverName: "reports",
+      start,
+      status,
+      open,
+      sleep: async () => {},
+    });
+
+    expect(open).toHaveBeenCalledWith(
+      "about:blank",
+      "_blank",
+    );
+    expect(authWindow.opener).toBeNull();
+    expect(authWindow.location.href).toBe("https://idp.example/authorize");
+    expect(status).toHaveBeenCalledTimes(2);
+    expect(result.status).toBe("approved");
+  });
+
+  it("surfaces a terminal OAuth error", async () => {
+    const close = vi.fn();
+    await expect(
+      completeMcpDashboardOAuth({
+        serverName: "reports",
+        start: async () => ({
+          flow_id: "flow-2",
+          server_name: "reports",
+          status: "error",
+          authorization_url: null,
+          error: "registration denied",
+        }),
+        status: vi.fn(),
+        open: vi.fn().mockReturnValue({ location: { href: "" }, close }),
+        sleep: async () => {},
+      }),
+    ).rejects.toThrow("registration denied");
+    expect(close).toHaveBeenCalledOnce();
+  });
+
+  it("fails before starting when the browser blocks the popup", async () => {
+    const start = vi.fn();
+    await expect(
+      completeMcpDashboardOAuth({
+        serverName: "reports",
+        start,
+        status: vi.fn(),
+        open: vi.fn().mockReturnValue(null),
+      }),
+    ).rejects.toThrow("popup was blocked");
+    expect(start).not.toHaveBeenCalled();
+  });
+});
diff --git a/web/src/lib/mcp-dashboard-oauth.ts b/web/src/lib/mcp-dashboard-oauth.ts
new file mode 100644
index 00000000000..62bbfb8975e
--- /dev/null
+++ b/web/src/lib/mcp-dashboard-oauth.ts
@@ -0,0 +1,51 @@
+import type { McpOAuthFlow } from "./api";
+
+type CompleteOptions = {
+  serverName: string;
+  start: (name: string) => Promise<McpOAuthFlow>;
+  status: (flowId: string) => Promise<McpOAuthFlow>;
+  open: (url?: string | URL, target?: string, features?: string) => unknown;
+  sleep?: (milliseconds: number) => Promise<void>;
+};
+
+const defaultSleep = (milliseconds: number) =>
+  new Promise<void>((resolve) => window.setTimeout(resolve, milliseconds));
+
+export async function completeMcpDashboardOAuth({
+  serverName,
+  start,
+  status,
+  open,
+  sleep = defaultSleep,
+}: CompleteOptions): Promise<McpOAuthFlow> {
+  // Open synchronously from the click handler, before the first await. Browsers
+  // otherwise classify the later OAuth popup as unsolicited and block it.
+  const authWindow = open("about:blank", "_blank") as Window | null;
+  if (!authWindow) {
+    throw new Error("OAuth popup was blocked — allow popups for this dashboard and retry");
+  }
+  authWindow.opener = null;
+  let started: McpOAuthFlow;
+  try {
+    started = await start(serverName);
+    if (started.status === "error") {
+      throw new Error(started.error || "OAuth failed to start");
+    }
+    if (!started.authorization_url) {
+      throw new Error("OAuth server did not provide an authorization URL");
+    }
+    authWindow.location.href = started.authorization_url;
+  } catch (error) {
+    authWindow.close();
+    throw error;
+  }
+
+  for (;;) {
+    const current = await status(started.flow_id);
+    if (current.status === "approved") return current;
+    if (current.status === "error") {
+      throw new Error(current.error || "OAuth authorization failed");
+    }
+    await sleep(1000);
+  }
+}
diff --git a/web/src/pages/McpPage.tsx b/web/src/pages/McpPage.tsx
index 1939c1f5756..454411bf14e 100644
--- a/web/src/pages/McpPage.tsx
+++ b/web/src/pages/McpPage.tsx
@@ -27,6 +27,7 @@ import {
   buildMcpServerCreate,
   type McpTransport,
 } from "@/lib/mcp-server-create";
+import { completeMcpDashboardOAuth } from "@/lib/mcp-dashboard-oauth";
 
 function isHttpUrl(value: string): boolean {
   return /^https?:\/\//i.test(value.trim());
@@ -183,13 +184,17 @@ export default function McpPage() {
   const handleAuthenticate = async (server: McpServer) => {
     setAuthenticating(server.name);
     try {
-      const result = await api.authMcpServer(server.name);
-      setTestResults((prev) => ({ ...prev, [server.name]: result }));
-      if (result.ok) {
-        showToast(`${server.name}: OAuth authentication complete`, "success");
-      } else {
-        showToast(`${server.name}: ${result.error ?? "OAuth failed"}`, "error");
-      }
+      const result = await completeMcpDashboardOAuth({
+        serverName: server.name,
+        start: api.authMcpServer,
+        status: api.getMcpOAuthFlow,
+        open: window.open.bind(window),
+      });
+      setTestResults((prev) => ({
+        ...prev,
+        [server.name]: { ok: true, tools: result.tools ?? [] },
+      }));
+      showToast(`${server.name}: OAuth authentication complete`, "success");
     } catch (e) {
       showToast(`OAuth error: ${e}`, "error");
     } finally {