kx-mcp-core

The assembly layer of the KX MCP composition container: a FastMCP 3.x parent that mounts pluggable backend bundles (KDB-X, KDB.AI, or your own) into one served MCP surface, and the home of the container's control plane — inbound authentication, the authorization seam, and per-dispatch audit.

Install it when you are assembling an MCP server from KX backend bundles:

uv add kx-mcp-core kx-mcp-kdbx        # from PyPI

On PyPI as a pre-release. 0.5.0b1 is published as a PEP 440 pre-release, so an unpinned install resolves it only while no final release exists — pin kx-mcp-core==0.5.0b1 if you need that exact version. Final releases (0.4.0 and earlier) are on the internal KX Nexus; see the deployment guide for either index.

What's in the box

• make_parent(name, auth=None) — builds the parent server; inbound auth (KX_MCP_AUTH: unset/static/jwks/entra) and the audit middleware attach here.
• mount_bundle / try_mount_bundle — mount a bundle's build_server() under a namespace; the try_ variant disables an unreachable backend instead of crashing the container.
• The kx-mcp launcher — the zero-code path: kx-mcp --bundles kdbx,kdbai (a bundle named <name> is the importable package kx_mcp_<name>).
• kx_mcp_core.auth — current_principal() (the validated inbound principal, visible to mounted tools), the @authorize PEP-1 capability decorator, AuditMiddleware, and re-exports of the shared kx-auth-core seams so bundle imports stay stable.

Minimal glue

from kx_mcp_core import make_parent, load_build_server, try_mount_bundle

app = make_parent("kx-mcp")
try_mount_bundle(app, load_build_server("kx_mcp_kdbx"), namespace="kdbx")
app.run(transport="streamable-http", host="127.0.0.1", port=8000)

Or no glue at all:

uvx --from kx-mcp-core --with kx-mcp-kdbx kx-mcp --bundles kdbx

Documentation

The full docs live in the kx-mcp-server-container repository, under docs/: the deployment guide, the auth reference (inbound modes, outbound strategies, authorization), and the extender guide for writing your own bundle — plus a reference downstream build (demos/extending/) showing a standalone project that assembles a server from these wheels.

All workspace packages version in lockstep from release tags — pin kx-mcp-core and your bundles to the same version.