From e5e88bf705dc6e3a12893e26cd249b601bc8ddee Mon Sep 17 00:00:00 2001 From: Johnny Bouder Date: Thu, 2 Jul 2026 11:54:52 -0400 Subject: [PATCH 1/3] Add frames agent. --- backend/pyproject.toml | 1 + .../demo_agents/__init__.py | 3 +- .../ravnar_nebari_chat/demo_agents/_frames.py | 64 +++++ backend/uv.lock | 227 +++++++++++++++++- 4 files changed, 290 insertions(+), 5 deletions(-) create mode 100644 backend/src/ravnar_nebari_chat/demo_agents/_frames.py diff --git a/backend/pyproject.toml b/backend/pyproject.toml index 1ef804f..8eb4f73 100644 --- a/backend/pyproject.toml +++ b/backend/pyproject.toml @@ -23,6 +23,7 @@ dependencies = [ "sqlalchemy[asyncio]>=2.0,<3", "psycopg[binary,pool]>=3.2.9,<4", "ravnar[serve,pydantic-ai]==0.0.14", + "mcp>=1.0", "opentelemetry-exporter-otlp>=1.39.0", ] dynamic = ["version"] diff --git a/backend/src/ravnar_nebari_chat/demo_agents/__init__.py b/backend/src/ravnar_nebari_chat/demo_agents/__init__.py index 0a79150..5cd06ad 100644 --- a/backend/src/ravnar_nebari_chat/demo_agents/__init__.py +++ b/backend/src/ravnar_nebari_chat/demo_agents/__init__.py @@ -1,4 +1,5 @@ -__all__ = ["make_austin_permits_agent", "make_sbir_awards_agent"] +__all__ = ["make_austin_permits_agent", "make_frames_agent", "make_sbir_awards_agent"] from ._austin_permits import make_austin_permits_agent +from ._frames import make_frames_agent from ._sbir_awards import make_sbir_awards_agent diff --git a/backend/src/ravnar_nebari_chat/demo_agents/_frames.py b/backend/src/ravnar_nebari_chat/demo_agents/_frames.py new file mode 100644 index 0000000..b49a214 --- /dev/null +++ b/backend/src/ravnar_nebari_chat/demo_agents/_frames.py @@ -0,0 +1,64 @@ +import warnings + +from pydantic_ai import Agent +from pydantic_ai.mcp import MCPServerStreamableHTTP +from ravnar.agents import PydanticAiAgentWrapper + +from ravnar_nebari_chat._utils import format_multiline + + +def make_frames_agent( + agent: Agent, + *, + mcp_url: str, + mcp_token: str | None = None, +) -> PydanticAiAgentWrapper: + """Build an agent backed by the nebari-frames MCP server. + + The nebari-frames tools are advertised to the model as an MCP toolset over + the Streamable HTTP transport. The agent opens and closes the MCP + connection automatically around each run, so no explicit lifecycle + management is needed here. + + Pass ``mcp_token`` to send an ``Authorization: Bearer `` header; + omit it (or pass an empty value) for an unauthenticated endpoint. + + If ``mcp_url`` is empty the MCP toolset is not attached at all. Ravnar + connects to every static agent's toolsets at startup to read their + capabilities, so attaching a server with no reachable URL would fail the + whole boot. Set ``NEBARI_FRAMES_MCP_URL`` to enable the tools. + """ + if agent.name is None: + agent.name = "Nebari Frames Agent" + + if mcp_url: + headers = {"Authorization": f"Bearer {mcp_token}"} if mcp_token else None + frames_server = MCPServerStreamableHTTP(mcp_url, headers=headers) + + # The Agent is constructed upstream (in config.yml) and handed to us, so + # we attach the MCP toolset to the already-built agent. `_user_toolsets` + # is the list `Agent.__init__` populates from its `toolsets=` argument. + agent._user_toolsets = [*agent._user_toolsets, frames_server] + else: + warnings.warn( + "NEBARI_FRAMES_MCP_URL is not set; the Nebari Frames Agent will have " + "no nebari-frames tools.", + stacklevel=2, + ) + + @agent.system_prompt + def system_prompt() -> str: + return format_multiline( + """ + You are an agent that answers the user's questions using the + nebari-frames tools. Those tools are provided over MCP; inspect the + tools available to you and call them to fetch data and perform + actions rather than guessing. + + Prefer calling a tool over answering from memory whenever the answer + depends on live data. When a tool fails or returns nothing useful, + explain what you tried instead of inventing a result. + """ + ) + + return PydanticAiAgentWrapper(agent) diff --git a/backend/uv.lock b/backend/uv.lock index 9a1cfcf..71965a8 100644 --- a/backend/uv.lock +++ b/backend/uv.lock @@ -2,7 +2,10 @@ version = 1 revision = 3 requires-python = ">=3.11, <3.15" resolution-markers = [ - "python_full_version >= '3.13'", + "python_full_version >= '3.14' and sys_platform == 'win32'", + "python_full_version >= '3.14' and sys_platform != 'win32'", + "python_full_version == '3.13.*' and sys_platform == 'win32'", + "python_full_version == '3.13.*' and sys_platform != 'win32'", "python_full_version < '3.13'", ] @@ -59,6 +62,15 @@ wheels = [ { url = "https://files.pythonhosted.org/packages/17/9c/fc2331f538fbf7eedba64b2052e99ccf9ba9d6888e2f41441ee28847004b/asgiref-3.10.0-py3-none-any.whl", hash = "sha256:aef8a81283a34d0ab31630c9b7dfe70c812c95eba78171367ca8745e88124734", size = 24050, upload-time = 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bearer token on User.data, and the frames agent forwards it on every MCP request via an httpx auth hook fed by a context variable seeded at the start of each run. The frames endpoint validates the token as long as its aud claim includes the MCP resource identifier, which an audience mapper on the chat Keycloak client provides. Capabilities are now declared statically instead of extracted at boot: extraction opens an MCP connection outside any run, where no user token exists, and the now-authenticated endpoint would 401 and fail startup. Co-Authored-By: Claude Fable 5 --- .../src/ravnar_nebari_chat/_authenticators.py | 23 +++-- .../ravnar_nebari_chat/demo_agents/_frames.py | 91 +++++++++++++++---- 2 files changed, 91 insertions(+), 23 deletions(-) diff --git a/backend/src/ravnar_nebari_chat/_authenticators.py b/backend/src/ravnar_nebari_chat/_authenticators.py index f198caa..57064bb 100644 --- a/backend/src/ravnar_nebari_chat/_authenticators.py +++ b/backend/src/ravnar_nebari_chat/_authenticators.py @@ -1,12 +1,23 @@ from __future__ import annotations -from ravnar.authenticators import ALL_PERMISSIONS, BearerTokenAuthenticator, OIDCTokenValidator +from ravnar.authenticators import ALL_PERMISSIONS, BearerTokenAuthenticator, OIDCTokenValidator, User + +ACCESS_TOKEN_DATA_KEY = "access_token" def keycloak_authenticator(*, keycloak_url: str, realm: str = "nebari") -> BearerTokenAuthenticator: - return BearerTokenAuthenticator( - OIDCTokenValidator( - issuer=f"{keycloak_url.rstrip('/')}/realms/{realm}", - default_permissions=list(ALL_PERMISSIONS), - ) + validate = OIDCTokenValidator( + issuer=f"{keycloak_url.rstrip('/')}/realms/{realm}", + default_permissions=list(ALL_PERMISSIONS), ) + + def validate_and_capture_token(token: str) -> User: + # Keep the raw bearer token on the user so agents can forward it to + # downstream services that accept the same Keycloak-issued token (e.g. + # the nebari-frames MCP endpoint). It stays server-side: User.data is + # never persisted or returned by any API endpoint. + user = validate(token) + user.data[ACCESS_TOKEN_DATA_KEY] = token + return user + + return BearerTokenAuthenticator(validate_and_capture_token) diff --git a/backend/src/ravnar_nebari_chat/demo_agents/_frames.py b/backend/src/ravnar_nebari_chat/demo_agents/_frames.py index b49a214..1d58fda 100644 --- a/backend/src/ravnar_nebari_chat/demo_agents/_frames.py +++ b/backend/src/ravnar_nebari_chat/demo_agents/_frames.py @@ -1,18 +1,55 @@ +import contextvars import warnings +from collections.abc import AsyncIterator, Generator +import ag_ui.core +import httpx from pydantic_ai import Agent from pydantic_ai.mcp import MCPServerStreamableHTTP from ravnar.agents import PydanticAiAgentWrapper +from ravnar.authenticators import User +from ravnar_nebari_chat._authenticators import ACCESS_TOKEN_DATA_KEY from ravnar_nebari_chat._utils import format_multiline +_access_token: contextvars.ContextVar[str | None] = contextvars.ContextVar("frames_access_token", default=None) -def make_frames_agent( - agent: Agent, - *, - mcp_url: str, - mcp_token: str | None = None, -) -> PydanticAiAgentWrapper: + +class _ForwardUserTokenAuth(httpx.Auth): + """Forward the calling chat user's Keycloak token to the MCP server. + + The nebari-frames MCP endpoint accepts the same Keycloak-issued user token + that authenticated the chat request, provided the token's ``aud`` claim + includes the frames MCP resource (an audience mapper on the chat client's + scope adds it). The token is read per request from a context variable + seeded by :class:`_FramesAgentWrapper` at the start of each run. + """ + + def auth_flow(self, request: httpx.Request) -> Generator[httpx.Request, httpx.Response]: + token = _access_token.get() + if token: + request.headers["Authorization"] = f"Bearer {token}" + yield request + + +class _FramesAgentWrapper(PydanticAiAgentWrapper): + """Agent wrapper that exposes the user's token to the MCP transport.""" + + async def run(self, input: ag_ui.core.RunAgentInput, user: User) -> AsyncIterator[ag_ui.core.Event]: + token = user.data.get(ACCESS_TOKEN_DATA_KEY) + if token is None: + warnings.warn( + "No access token on the authenticated user; nebari-frames MCP " + "calls will be unauthenticated. Is the keycloak_authenticator " + "configured?", + stacklevel=2, + ) + _access_token.set(token) + async for event in super().run(input, user): + yield event + + +def make_frames_agent(agent: Agent, *, mcp_url: str) -> PydanticAiAgentWrapper: """Build an agent backed by the nebari-frames MCP server. The nebari-frames tools are advertised to the model as an MCP toolset over @@ -20,20 +57,28 @@ def make_frames_agent( connection automatically around each run, so no explicit lifecycle management is needed here. - Pass ``mcp_token`` to send an ``Authorization: Bearer `` header; - omit it (or pass an empty value) for an unauthenticated endpoint. + Each MCP request carries the calling user's own Keycloak access token, so + frames applies that user's identity and permissions. This requires the + token's audience to include the frames MCP resource identifier (Keycloak + audience mapper on the chat client) — see ``OIDC_MCP_AUDIENCE`` in the + nebari-frames docs. - If ``mcp_url`` is empty the MCP toolset is not attached at all. Ravnar - connects to every static agent's toolsets at startup to read their - capabilities, so attaching a server with no reachable URL would fail the - whole boot. Set ``NEBARI_FRAMES_MCP_URL`` to enable the tools. + If ``mcp_url`` is empty the MCP toolset is not attached at all, and the + agent loads with no frames tools. Set ``NEBARI_FRAMES_MCP_URL`` to enable + the tools. """ if agent.name is None: agent.name = "Nebari Frames Agent" if mcp_url: - headers = {"Authorization": f"Bearer {mcp_token}"} if mcp_token else None - frames_server = MCPServerStreamableHTTP(mcp_url, headers=headers) + # The factory pydantic-ai builds around a caller-supplied http_client + # drops the transport's timeout hints, so set them here: short connect, + # long read for the SSE stream (mirrors pydantic-ai's own defaults). + http_client = httpx.AsyncClient( + auth=_ForwardUserTokenAuth(), + timeout=httpx.Timeout(5, read=60 * 5), + ) + frames_server = MCPServerStreamableHTTP(mcp_url, http_client=http_client) # The Agent is constructed upstream (in config.yml) and handed to us, so # we attach the MCP toolset to the already-built agent. `_user_toolsets` @@ -41,8 +86,7 @@ def make_frames_agent( agent._user_toolsets = [*agent._user_toolsets, frames_server] else: warnings.warn( - "NEBARI_FRAMES_MCP_URL is not set; the Nebari Frames Agent will have " - "no nebari-frames tools.", + "NEBARI_FRAMES_MCP_URL is not set; the Nebari Frames Agent will have no nebari-frames tools.", stacklevel=2, ) @@ -61,4 +105,17 @@ def system_prompt() -> str: """ ) - return PydanticAiAgentWrapper(agent) + # Capabilities are declared statically: extracting them would connect to + # the MCP server at startup, and with per-user auth there is no token to + # send outside a run — the frames endpoint would reject the connection and + # fail the whole boot. + capabilities = ag_ui.core.AgentCapabilities( + identity=ag_ui.core.IdentityCapabilities( + name=agent.name, + description=agent.description, + type="pydantic-ai", + ), + transport=ag_ui.core.TransportCapabilities(streaming=True), + tools=ag_ui.core.ToolsCapabilities(supported=True, client_provided=True), + ) + return _FramesAgentWrapper(agent, capabilities=capabilities) From 2a006a0691a7f880c3ef5bd78a88a97a59be885b Mon Sep 17 00:00:00 2001 From: Philip Meier Date: Mon, 6 Jul 2026 17:16:58 +0200 Subject: [PATCH 3/3] cleanup --- .../src/ravnar_nebari_chat/_authenticators.py | 23 +++++-------------- 1 file changed, 6 insertions(+), 17 deletions(-) diff --git a/backend/src/ravnar_nebari_chat/_authenticators.py b/backend/src/ravnar_nebari_chat/_authenticators.py index 57064bb..f198caa 100644 --- a/backend/src/ravnar_nebari_chat/_authenticators.py +++ b/backend/src/ravnar_nebari_chat/_authenticators.py @@ -1,23 +1,12 @@ from __future__ import annotations -from ravnar.authenticators import ALL_PERMISSIONS, BearerTokenAuthenticator, OIDCTokenValidator, User - -ACCESS_TOKEN_DATA_KEY = "access_token" +from ravnar.authenticators import ALL_PERMISSIONS, BearerTokenAuthenticator, OIDCTokenValidator def keycloak_authenticator(*, keycloak_url: str, realm: str = "nebari") -> BearerTokenAuthenticator: - validate = OIDCTokenValidator( - issuer=f"{keycloak_url.rstrip('/')}/realms/{realm}", - default_permissions=list(ALL_PERMISSIONS), + return BearerTokenAuthenticator( + OIDCTokenValidator( + issuer=f"{keycloak_url.rstrip('/')}/realms/{realm}", + default_permissions=list(ALL_PERMISSIONS), + ) ) - - def validate_and_capture_token(token: str) -> User: - # Keep the raw bearer token on the user so agents can forward it to - # downstream services that accept the same Keycloak-issued token (e.g. - # the nebari-frames MCP endpoint). It stays server-side: User.data is - # never persisted or returned by any API endpoint. - user = validate(token) - user.data[ACCESS_TOKEN_DATA_KEY] = token - return user - - return BearerTokenAuthenticator(validate_and_capture_token)