[nix] vectorcode x mcp

[AdrienLemaire]

@sarahec @GaetanLepage thanks for fixing the vectorcode build issue in NixOS/nixpkgs#415770

I'm trying to configure it with MCPHub, and got this error:

  [07:20:28]  Config file change detected  
  [07:20:28]  Config loaded successfully from /home/dori/.config/mcphub/servers.json  
  [07:20:28]  Config changes processed  
  [07:20:28]  vectorcode-mcp-server stderr: MCP Python SDK not installed. Please install it by installing `vectorcode[mcp]` dependency group.  
  [07:20:28]  'vectorcode-mcp-server' transport closed  
  [07:20:28]  'vectorcode-mcp-server' failed to start connection: MCP error -32000: Connection closed  

It asks about vectorcode[mcp], and it looks like Gaetan made it an optional dependency in the package.nix.

So I tried to update my environment packages as follow:

{ inputs, pkgs, pkgs-unstable, lib, ... }:

let
  # Override vectorcode to include mcp and pydantic dependencies
  vectorcode-with-mcp = pkgs-unstable.vectorcode.overrideAttrs (old: {
    propagatedBuildInputs = old.propagatedBuildInputs
      ++ pkgs-unstable.vectorcode.optional-dependencies.mcp;
  });
in {
  environment.systemPackages = with pkgs; [
    inputs.mcp-hub.packages.x86_64-linux.default
    vectorcode-with-mcp
    uv # python needed by MCPHub
  ];
}

But now, I get this error:

[07:20:31]  Config changes processed  
  [07:20:31]  vectorcode-mcp-server stderr: Loading default config.  
  [07:20:31]  vectorcode-mcp-server stderr: Traceback (most recent call last):  
  [07:20:31]  vectorcode-mcp-server stderr: File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 101, in map_httpcore_exceptions\n    yield\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 394, in handle_async_request\n    resp = await self._pool.handle_async_request(req)\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection_pool.py", line 256, in handle_async_request\n    raise exc from None\n  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection_pool.py", line 236, in handle_async_request\n    response = await connection.handle_async_request(\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n        pool_request.request\n        ^^^^^^^^^^^^^^^^^^^^\n    )\n    ^  
  [07:20:31]  vectorcode-mcp-server stderr: File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection.py", line 101, in handle_async_request\n    raise exc\n  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection.py", line 78, in handle_async_request\n    stream = await self._connect(request)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection.py", line 124, in _connect\n    stream = await self._network_backend.connect_tcp(**kwargs)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_backends/auto.py", line 31, in connect_tcp\n    return await self._backend.connect_tcp(\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    ...<5 lines>...\n    )\n    ^\n  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_backends/anyio.py", line 113, in connect_tcp\n    with map_exceptions(exc_map):\n         ~~~~~~~~~~~~~~^^^^^^^^^\n  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/contextlib.py", line 162, in __exit__\n    self.gen.throw(value)\n    ~~~~~~~~~~~~~~^^^^^^^\n  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_exceptions.py", line 14, in map_exceptions\n    raise to_exc(exc) from exc\nhttpcore.ConnectError: All connection attempts failed\n\nThe above exception was the direct cause of the following exception:\n\nTraceback (most recent call last):  
  [07:20:31]  vectorcode-mcp-server stderr: File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/bin/.vectorcode-mcp-server-wrapped", line 9, in <module>\n    sys.exit(main())\n             ~~~~^^\n  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/mcp_main.py", line 223, in main\n    return asyncio.run(run_server())\n           ~~~~~~~~~~~^^^^^^^^^^^^^^\n  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/asyncio/runners.py", line 195, in run\n    return runner.run(main)\n           ~~~~~~~~~~^^^^^^\n  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/asyncio/runners.py", line 118, in run\n    return self._loop.run_until_complete(task)\n           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^\n  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete\n    return future.result()\n           ~~~~~~~~~~~~~^^\n  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/mcp_main.py", line 211, in run_server\n    mcp = await mcp_server()\n          ^^^^^^^^^^^^^^^^^^\n  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/mcp_main.py", line 163, in mcp_server\n    default_client = await get_client(default_config)\n                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/common.py", line 132, in get_client\n    __CLIENT_CACHE[client_entry] = await chromadb.AsyncHttpClient(\n                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    ...<3 lines>...\n    )\n    ^\n  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/__init__.py", line 254, in AsyncHttpClient\n    return await AsyncClientCreator.create(\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n        tenant=tenant, database=database, settings=settings\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    )\n    ^\n  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_client.py", line 69, in create\n    user_identity = await self.get_user_identity()\n                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_client.py", line 113, in get_user_identity\n    return await self._server.get_user_identity()\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/telemetry/opentelemetry/__init__.py", line 134, in async_wrapper\n    return await f(*args, **kwargs)\n           ^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_fastapi.py", line 229, in get_user_identity\n    return UserIdentity(**(await self._make_request("get", "/auth/identity")))\n                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_fastapi.py", line 131, in _make_request\n    response = await self._get_client().request(method, url, **cast(Any, kwargs))\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1540, in request\n    return await self.send(request, auth=auth, follow_redirects=follow_redirects)\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1629, in send\n    response = await self._send_handling_auth(\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    ...<4 lines>...\n    )\n    ^\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1657, in _send_handling_auth\n    response = await self._send_handling_redirects(\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n    ...<3 lines>...\n    )\n    ^\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1694, in _send_handling_redirects\n    response = await self._send_single_request(request)\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1730, in _send_single_request\n    response = await transport.handle_async_request(request)\n               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 393, in handle_async_request\n    with map_httpcore_exceptions():\n         ~~~~~~~~~~~~~~~~~~~~~~~^^\n  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/contextlib.py", line 162, in __exit__\n    self.gen.throw(value)\n    ~~~~~~~~~~~~~~^^^^^^^\n  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 118, in map_httpcore_exceptions\n    raise mapped_exc(message) from exc\nhttpx.ConnectError: All connection attempts failed  
  [07:20:31]  'vectorcode-mcp-server' transport closed  
  [07:20:31]  'vectorcode-mcp-server' failed to start connection: MCP error -32000: Connection closed  

The exact issue is unclear to me, but it feels like vectorcode fails to connect to the chroma db (which I'm expecting vectorcode to start by itself like with vectorcode cli).

Did I incorrectly configure vectorcode-with-mcp ?

EDIT: the logs error is just about vectorcode-mcp-server not starting.

Traceback

$ vectorcode-mcp-server
Loading default config.
Traceback (most recent call last):
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 101, in map_httpcore_exceptions
    yield
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 394, in handle_async_request
    resp = await self._pool.handle_async_request(req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection_pool.py", line 256, in handle_async_request
    raise exc from None
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection_pool.py", line 236, in handle_async_request
    response = await connection.handle_async_request(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        pool_request.request
        ^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection.py", line 101, in handle_async_request
    raise exc
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection.py", line 78, in handle_async_request
    stream = await self._connect(request)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_async/connection.py", line 124, in _connect
    stream = await self._network_backend.connect_tcp(**kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_backends/auto.py", line 31, in connect_tcp
    return await self._backend.connect_tcp(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
    )
    ^
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_backends/anyio.py", line 113, in connect_tcp
    with map_exceptions(exc_map):
         ~~~~~~~~~~~~~~^^^^^^^^^
  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/contextlib.py", line 162, in __exit__
    self.gen.throw(value)
    ~~~~~~~~~~~~~~^^^^^^^
  File "/nix/store/d503w6w9wq7mv0ypqd7qdc2lzg79a597-python3.13-httpcore-1.0.9/lib/python3.13/site-packages/httpcore/_exceptions.py", line 14, in map_exceptions
    raise to_exc(exc) from exc
httpcore.ConnectError: All connection attempts failed

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/bin/.vectorcode-mcp-server-wrapped", line 9, in <module>
    sys.exit(main())
             ~~~~^^
  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/mcp_main.py", line 223, in main
    return asyncio.run(run_server())
           ~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/asyncio/runners.py", line 195, in run
    return runner.run(main)
           ~~~~~~~~~~^^^^^^
  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/mcp_main.py", line 211, in run_server
    mcp = await mcp_server()
          ^^^^^^^^^^^^^^^^^^
  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/mcp_main.py", line 163, in mcp_server
    default_client = await get_client(default_config)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/sf4677c61nhhf8vbbvybm87m5lk4pcdr-vectorcode-0.6.12/lib/python3.13/site-packages/vectorcode/common.py", line 132, in get_client
    __CLIENT_CACHE[client_entry] = await chromadb.AsyncHttpClient(
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
    )
    ^
  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/__init__.py", line 254, in AsyncHttpClient
    return await AsyncClientCreator.create(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        tenant=tenant, database=database, settings=settings
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_client.py", line 69, in create
    user_identity = await self.get_user_identity()
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_client.py", line 113, in get_user_identity
    return await self._server.get_user_identity()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/telemetry/opentelemetry/__init__.py", line 134, in async_wrapper
    return await f(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_fastapi.py", line 229, in get_user_identity
    return UserIdentity(**(await self._make_request("get", "/auth/identity")))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/0i4pw049a9abx39hmzjc8zqn1pgicckj-python3.13-chromadb-0.6.3/lib/python3.13/site-packages/chromadb/api/async_fastapi.py", line 131, in _make_request
    response = await self._get_client().request(method, url, **cast(Any, kwargs))
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1540, in request
    return await self.send(request, auth=auth, follow_redirects=follow_redirects)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1629, in send
    response = await self._send_handling_auth(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<4 lines>...
    )
    ^
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1657, in _send_handling_auth
    response = await self._send_handling_redirects(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<3 lines>...
    )
    ^
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1694, in _send_handling_redirects
    response = await self._send_single_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_client.py", line 1730, in _send_single_request
    response = await transport.handle_async_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 393, in handle_async_request
    with map_httpcore_exceptions():
         ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/nix/store/sd81bvmch7njdpwx3lkjslixcbj5mivz-python3-3.13.4/lib/python3.13/contextlib.py", line 162, in __exit__
    self.gen.throw(value)
    ~~~~~~~~~~~~~~^^^^^^^
  File "/nix/store/5km8ja0a1q3fs8dv3ypb13hfz2vrlqsf-python3.13-httpx-0.28.1/lib/python3.13/site-packages/httpx/_transports/default.py", line 118, in map_httpcore_exceptions
    raise mapped_exc(message) from exc
httpx.ConnectError: All connection attempts failed

Looking at the doc, I see

To try it out, install the vectorcode[mcp] dependency group and the MCP server
is available in the shell as vectorcode-mcp-server, and make sure you're using
a standalone chromadb server configured in the JSON
via the host and port options.

So it seems like we'd need to reinstall chromadb independently from vectorcode with its own systemctl service, as was done with chromadb_0 if I recall correctly.

[Davidyz]

I'm not quite sure about the nix part, but

(which I'm expecting vectorcode to start by itself like with vectorcode cli)

This is a "feature", not a bug (at least for now).

The vectorcode MCP server doesn't start a Chromadb server because I'm not quite sure how to handle the potential race condition (multiple instances writing to the same database file at the same time). The same applies to the LSP. I've thought about a filelock for the db_path directory, but later got distracted by other features/bugs. I can take a look at this, and maybe I can come up with something that resolves this.

[Davidyz]

Just released the filelock stuff as part of the 0.7.4 GitHub/pypi release. You should now be able to use MCP and LSP without a standalone Chromadb server. The nix packages might take a bit longer(?) because I'm not personally managing them.

[GaetanLepage]

Opened NixOS/nixpkgs#420770

[sarahec]

And approved ;)

[sarahec]

@AdrienLemaire can you file a bug on https://github.com/NixOS/nixpkgs/issues and ping myself and Gaetan? We can track the nix-side fix there.

[Davidyz]

Would a dedicated "Nix" category here in the discussion forum help with the issue tracking for the nix related stuff? Not sure how issue tracking usually works in the nix community, but if you need a place for that, just let me know.

[GaetanLepage]

It's maybe not necessary.
For now, we have two "issues":

1. onnxruntime fails in the nix sandbox on aarch64-linux. There is probably not much you can do. Before, we were able to skip our "import check" and "test phase" on this platform. The installation was succeeding. However, this is no longer sufficient with 0.7.4 as the error triggers at the end of the installation fails.
   I bisected the issue to 99709a9.
2. You still require chromadb<=0.6.3 which requires us to embed a downgraded version of chromadb in the vectorcode derivation. While this does not prevent the package from working, it is slightly more annoying to maintain. Not a deal breaker though.

[Davidyz]

onnxruntime fails in the nix sandbox on aarch64-linux.

Noted. I don't have an aarch64 machine so I never really tested this. I can try to fiddle with the current ci/cd infra and see if we can get some automated tests for aarch64 Linux. Regardless of whether it passes or not, this should help you pinpoint the problem.

The chromadb thing is more troublesome. I opened an issue in the chromadb repo about the data file incompatibility over the 0.6.3->1.0 upgrade, but there doesn't seem to be any important progress over there.

[Davidyz]

I can try to fiddle with the current ci/cd infra and see if we can get some automated tests for aarch64 Linux.

https://github.com/Davidyz/VectorCode/actions/runs/15954420161/job/44998795193 so it builds fine on Ubuntu 24.04 arm and passed all tests... (Which is good news for me I guess)

[GaetanLepage]

Well, I think it's specific to the Nix sandbox, so I'm not surprised the test passes on Ubuntu arm. Thanks for taking a look anyway.
I'm not sure you can do much here, as this is an onnxruntime issue (microsoft/onnxruntime#10038).