tai42-contract
Pure interface contracts for the TAI ecosystem: the protocols, ABCs, pydantic
models, and enums every other package builds against. At runtime this package
imports nothing but pydantic, and its behaviour is limited to a narrow
whitelisted surface — the tai42_app forwarding handle, model-level
validators/normalizers, the storage path guard, and Agent's default
astream/terminal-drain; everything else is a pydantic model, Protocol, ABC, or
enum. Vendor types (fastmcp, langchain, starlette, mcp) appear only inside
TYPE_CHECKING blocks, so they are never loaded when the code runs.
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). Everything plugs in against the interfaces this package defines.
Three packages; each depends only on the ones to its left:
tai42-contract <-- tai42-kit <-- tai42-skeleton
(interfaces) (helpers) (the server)
tai42-contract is the leaf: it depends on no other tai-* package, so anything —
the skeleton, a plugin, a helper — can import it without pulling in an
implementation.
Install
Requires Python 3.13+. Install from PyPI into the environment that runs the
server. Usually pulled in transitively via tai42-kit / tai42-skeleton, but it
installs directly too:
uv add tai42-contract
Or from source — clone this repo and add it as an editable dependency:
git clone https://github.com/tai42ai/tai42 # next to your app checkout
cd /path/to/your/app
uv add --editable ../tai42/core/contract
Development
uv venv --python 3.13
uv pip install --no-sources --editable ".[dev]" # pydantic + tooling + vendor libs (for pyright)
uv run --no-sync ruff check .
uv run --no-sync ruff format --check .
uv run --no-sync pyright
uv run --no-sync pytest --cov --cov-report=term-missing # self-contained contract tests
Documentation
The whole platform — concepts, guides, and the generated reference — lives in the unified documentation site:
- Layering & the contract/kit/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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