oneharness-sdk

Async Python access to the oneharness engine, generated from and validated against the Rust-owned JSON Schema contracts. The distribution is oneharness-sdk, the import is oneharness_sdk, and every release depends on the exact same oneharness-cli version.

pip install oneharness-sdk

import asyncio

from oneharness_sdk import OneHarness


async def main() -> None:
    oneharness = OneHarness()
    report = await oneharness.run(
        {"prompt": "Summarize this repository", "harnesses": ["codex"]}
    )
    print(report["results"][0]["text"])


asyncio.run(main())

Every JSON-returning method passes --format json --compact itself, so the CLI's own default (a human-readable text view) never reaches the SDK. A run over several harnesses is a fallback chain by default — the first candidate that can run does, and the report's fallback block says which; pass "run_mode": "parallel" to run them all at once.

The client covers every verb the CLI exposes, so nothing needs a hand-built command line: run, run_mock, run_stream, list, detect, config, sync, init, usage, gate, mock, interrupt, history, history_list, history_watch, history_clear, history_migrate, and history_pointers. That coverage is gated, not asserted here. run_mock uses the deterministic responder shipped in the CLI; see Testing patterns. run_stream and history_watch are async iterators. Every envelope is validated before it is yielded; closing or cancelling an iterator terminates its subprocess.

An option whose name is a Python keyword takes the conventional trailing underscore — sync({"global_": True}) sends --global — and nothing else about the spelling changes.

async for envelope in oneharness.run_stream(
    {"prompt": "Inspect this repository", "harnesses": ["codex"]}
):
    if envelope["type"] == "event" and envelope["event"]["name"] == "shell":
        break

async for envelope in oneharness.history_watch(
    {"labels": {"graph": "release"}, "after": last_history_id}
):
    print(envelope["record"]["history_id"])

Python input keys are snake case and strict: unknown fields and misspellings fail before the CLI starts. Output dictionaries preserve additive fields from newer compatible CLI versions. history and history_watch raise HistoryNotFoundError when a session, record, or cursor cannot be resolved.

Metadata

Release files for oneharness-sdk 0.19.1

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Source distribution (sdist)

Source distribution for oneharness-sdk 0.19.1
File	Size	Uploaded
oneharness_sdk-0.19.1.tar.gz	108.5 kB	Sep 30, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for oneharness-sdk 0.19.1
File	Interpreter	ABI	Platform	Reset
oneharness_sdk-0.19.1-py3-none-any.whl 110.9 kB Sep 30, 2026	Python 3	none	any	Details

Total release size: 219.4 kB

Release files / oneharness_sdk-0.19.1.tar.gz

Download URL	oneharness_sdk-0.19.1.tar.gz
Size	108.5 kB
Tags	Source
SHA-256 checksum How to use checksums	`1b91a274d9750d97f9a5a2aeae6318ca48273aec451211c2ea6b745fe25c4c39`
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
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Publishing commit: github.com/nickderobertis/oneharness/tree/7f52d05a50fd8af0ed3bd9b3afc7f9adf717d116

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Subject: oneharness_sdk-0.19.1.tar.gz
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Release files / oneharness_sdk-0.19.1-py3-none-any.whl

Download URL	oneharness_sdk-0.19.1-py3-none-any.whl
Size	110.9 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`eef078e3b1cc184b00375dd343504f440c90b73db429fe6ff5b17708d66d973e`
BLAKE2b-256 checksum How to use checksums	`643e299122a80ec0c9475cf9d36700d82fc850aab7146f3ed907944506041857`
Upload date	Sep 30, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

Provenance

Identity

Publishing platform: GitHub Actions
Publishing repository: github.com/nickderobertis/oneharness
Publishing commit: github.com/nickderobertis/oneharness/tree/7f52d05a50fd8af0ed3bd9b3afc7f9adf717d116

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Publishing configuration: github.com/nickderobertis/oneharness/blob/7f52d05a50fd8af0ed3bd9b3afc7f9adf717d116/.github/workflows/release.yml
Publishing logs: github.com/nickderobertis/oneharness/actions/runs/36666367186/attempts/2

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Subject: oneharness_sdk-0.19.1-py3-none-any.whl
SHA-256 checksum: eef078e3b1cc184b00375dd343504f440c90b73db429fe6ff5b17708d66d973e Verifying attestations