tai42-kit
Generic leaf helpers, settings primitives, pooled clients, and LLM/AI factories
for the TAI ecosystem. It provides the reusable building blocks the server is
composed from: data and text transforms, LangChain/FastMCP/MCP tool glue, the
pooled-client facade and concrete drivers (redis, curl, mcp, postgres,
http), the SSRF URL guard and safe download, MCP client transports over a UDS
socket, the settings machinery, LLM/embedding factories with checkpoint/store
backends, and logging setup. Heavier backends are gated behind extras and
imported lazily. Typed package (py.typed).
Position in the ecosystem
TAI is an open-source runtime for MCP tools, agents, and workflows — the server that hosts a capability and supplies the operational layer around it (manifest loading, access control, OAuth connectors, background execution, monitoring, storage, and human-in-the-loop steps).
Four packages; each depends only on the ones to its left:
tai42-kit <--.
/ (helpers) \
tai42-contract <-+ +-- tai42-skeleton
(interfaces) \ / (the server)
tai42-cli <--'
(the remote client)
tai42-kit obeys the leaf rule: its only tai-* dependency is tai42-contract
(the 7.x contract line). It
implements the contract's BaseClient Protocol and consumes its manifest types;
among tai-* packages it depends on nothing else.
Install
Requires Python 3.13+. Install from PyPI into the environment that runs the server:
uv add tai42-kit
Or from source — clone this repo and add it as an editable dependency; the
tai42-* dependencies resolve in-tree from the workspace.
git clone https://github.com/tai42ai/tai42 # next to your app checkout
cd /path/to/your/app
uv add --editable ../tai42/core/kit
Backends are gated behind extras, so install the ones you need — e.g. the
pooled-client drivers tai42-kit[redis], tai42-kit[postgres], tai42-kit[curl], the
checkpoint/store backends tai42-kit[langgraph-checkpoint-postgres],
tai42-kit[langgraph-checkpoint-sqlite], and LLM-provider backends like
tai42-kit[anthropic], tai42-kit[google], tai42-kit[mistral], tai42-kit[xai],
tai42-kit[ollama], tai42-kit[huggingface].
Development
uv venv --python 3.13
uv pip install --no-sources --editable ".[dev,llm,jq,uvicorn,redis,curl,postgres]"
uv run --no-sync ruff check .
uv run --no-sync ruff format --check .
uv run --no-sync pyright # 0 errors; missing optional ML backends report as warnings
uv run --no-sync pytest --cov --cov-report=term-missing # optional-extra tests skip if their extra is absent
See CONTRIBUTING.md for the rules.
Documentation
The whole platform — concepts, guides, and the generated reference — lives in the unified documentation site:
- Layering & the contract/kit/cli/skeleton split: https://tai42.ai/concepts/layering
- Python SDK reference (this package's public API): https://tai42.ai/reference/python-sdk
License
Apache-2.0. See LICENSE and NOTICE.
1 maintainer
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