xyberos-mcp

Model Context Protocol client plugin — RFC-0019, M3. Xyberos → MCP → an enormous ecosystem. Speaks the MCP protocol (JSON-RPC 2.0) over stdio (local servers) and streamable HTTP (remote servers) using only the standard library. Each configured server's tools/list becomes one typed Tool (named {server}_{tool}), with arguments coerced through FunctionTool / coerce_arguments.

Install

pip install -e ./mcp

The client is stdlib-only; the [mcp] optional extra installs the official SDK (not required). xyberos[mcp] is also declared in the core extras.

Usage

from xyberos import create_app
from xyberos_mcp import McpPlugin

servers = {
    "demo": {"command": ["python", "examples/demo_mcp_server.py"]},
    "remote": {"url": "https://example.com/mcp", "headers": {"Authorization": "Bearer ..."}},
}

app = create_app()
app.load_plugin(McpPlugin(servers))

app.tools.execute("demo_echo", None, text="hello", repeat=2)

Or configure entirely through the environment (MCP_SERVERS = JSON path or inline JSON). An unconfigured instance registers nothing (logs a warning).

Direct client use

from xyberos_mcp import McpClient
from xyberos_mcp.registry import ServerConfig

with McpClient(ServerConfig(name="demo", command=["python", "demo_mcp_server.py"])) as client:
    client.list_tools()          # -> [{name, description, inputSchema}]
    client.call_tool("echo", {"text": "hi"})

Design

  • Transports — StdioTransport (newline-delimited JSON-RPC over a subprocess) and HttpTransport (streamable HTTP; handles application/json and text/event-stream responses).
  • Lifecycle — connect/disconnect/reconnect, initialize handshake + notifications/initialized, per-request timeouts, and utils.resilience.retry on connect.
  • Security — shell=False + literal argv (no shell interpolation), new session / hidden-window subprocess isolation, and a ServerAllowlist that refuses unlisted servers.
  • Typed tools — MCP inputSchema → FunctionTool signature (same __signature__ technique as the M2 HTTP connector).

Examples

  • examples/demo_mcp_server.py — a minimal local MCP server (echo, add).
  • examples/mcp_client.py — connects to it, lists tools, calls one.
  • examples/servers.json — stdio + remote HTTP config reference.

Tests

pip install pytest
pytest tests/

The tests launch the bundled fake MCP server (stdio) and a local HTTP endpoint (both application/json and SSE modes) — no external network, no SDK.

Ship location

Plugin (xyberos.plugins entry point) + optional [mcp] extra. Depends on M2's HTTP/typed-tool patterns.

Key dates

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  • Released:
Latest release

1 maintainer

PyPI data
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Avatar for BaltzDC from gravatar.com BaltzDC

License

Apache-2.0

Requires

Python >=3.10

Provides Extra

mcp test

Tags

xyberos plugin mcp model context protocol tools

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