mcbp-core

Async HTTP client and shared tool registry for the BAS / 1C MCBP_AI service (/ai/v1).

This is the engine shared by two front-ends: the mcbp MCP server and a FastAPI web chat. It holds everything that knows about BAS — routes, filters, response shapes, typed errors — so those front-ends hold none of it.

Requires a server-side component. mcbp-core talks to the MCBP_AI HTTP service, a BSL module installed into a BAS/1C configuration through Конфігуратор. That module is licensed separately and is not part of this package. Without it there is nothing to connect to.

The MCBP+ configuration and the MCBP_AI service module are proprietary works of MCBP.PLUS and are distributed separately. This MIT licence covers the Python package only.

What it gives you

• MCBPClient — one pooled httpx.AsyncClient over the BAS publication: HTTP Basic auth, retries on 503, an in-memory metadata cache, and an offline mock mode for tests.
• Typed errors — the {"error": {"code", "message"}} envelope BAS returns is mapped to exception classes (ParameterError, NotFoundError, KeyMismatchError, PlusRequiredError, …), so callers branch on type instead of re-parsing text.
• A tool registry — 13 ToolSpecs (JSON Schema + async executor) covering catalogs, documents, registers, metadata introspection and the gated write routes. Both front-ends register from this one list, so their surfaces cannot drift apart.

Usage

from mcbp_core.client import ConnectionConfig, MCBPClient
from mcbp_core.tools import tool_specs

client = MCBPClient(ConnectionConfig(
    base_url="http://host/base/hs/mcbp_ai",   # without the /ai/v1 suffix — the client adds it
    user="ai_service", password="***", mock=False,
))
await client.startup()
try:
    rows = await client.list_catalog(type_="Номенклатура", cursor=None, limit=50, q="кабель")
finally:
    await client.shutdown()

Selecting the tools a front-end should expose:

read_only = tool_specs(surface="mcp")                        # 10 specs
everything = tool_specs(surface="mcp", include_write=True)   # 13 specs

Tool descriptions are Ukrainian by default; ToolSpec.description_en carries the English variant used by the MCP surface.

Requirements

Python 3.11+.

License

MIT — see LICENSE.