deepseek-harness/python

DeepSeek Harness Python SDK

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Python packages for driving DeepSeek Harness as a subprocess: a client SDK that spawns the dsh-jsonrpc-agent binary and talks newline-delimited JSON-RPC over stdio. The runtime carrier is the single-file executable produced by this repo; design, build, and acceptance details live in .agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.md.

Packages

Directory	Dist / module	Role
sdk	deepseek-harness / deepseek_harness	Client SDK: the DeepSeekHarness high-level turns API and the lower-level HarnessClient JSON-RPC client
sdk-runtime	deepseek-harness-runtime-bin / deepseek_harness_runtime	Runtime carrier: locates the bundled runtime binaries and ships the default agent configuration

Building the runtime executable

The platform executables are build artifacts, not checked into git. From the repo root:

pnpm install
pnpm exec tsx scripts/build-exe-for-python-sdk.ts                 # host platform, ~2 min
pnpm exec tsx scripts/build-exe-for-python-sdk.ts --skip-build    # lib/ artifacts already built
pnpm exec tsx scripts/build-exe-for-python-sdk.ts --targets=node24-linux-x64,node24-linux-arm64,node24-macos-arm64

Products land in dist-exe/ and are synced into this package at sdk-runtime/src/deepseek_harness_runtime/runtime/dsh-jsonrpc-agent-pkg-<platform>-<arch> (platform: linux/macos; arch: x64/arm64) — after a local build the SDK finds the executable with no further setup. The build-exe-for-python-sdk CI workflow (manual dispatch, or the build-exe PR label) exercises the same binaries. A full three-target run retains four release wheels; a subset dispatch retains the SDK wheel and selected platform wheels. Which plugins the exe bundles and how the carriers are organized: sdk-runtime README; the build also refreshes the dev-only node carrier (see "against the Node source" below).

Validating the SDK against the executable

export UV_PROJECT_ENVIRONMENT="$PWD/tmp/py-sdk-venv"   # keep the venv out of python/
uv sync --project python/sdk --group test
uv run --project python/sdk pytest python/sdk/tests/test_bundled_runtime.py   # boots the real carriers
uv run --project python/sdk pytest                                            # full suite; keyless tests included

For an interactive check (needs DEEPSEEK_API_KEY in the environment or the repo-root .env):

from deepseek_harness import DeepSeekHarness
with DeepSeekHarness() as harness:
    print(harness.run("say hi").final_response)   # auto-resolution picks the bundled exe

Running the SDK against the Node source (no executable)

Two flavors, both for repo members:

• Built node carrier — set DSH_RUNTIME_MODE=node and the SDK runs runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js on the system Node (>= 22.19). The tree is refreshed on every build-script run and is the same dependency closure the exe snapshots, so plugin semantics are identical. Never auto-selected, never distributed.
• Unbuilt source (tsx) — point the client straight at the bin's TypeScript source for edit-run loops and debugging: launch_args_override=("./node_modules/.bin/tsx", "packages/examples/jsonrpc-demo/src/bin.ts") with cwd at the repo root, plus a config via cordis=... (or rely on the default-config injection). sdk/tests/manual_sdk_agent_smoke.py is the worked example.

Distributing the Python packages

The root package.json version is authoritative for both Python distributions. The common staging script reads that version, injects it into both wheels, and pins the SDK metadata to the same deepseek-harness-runtime-bin==X.Y.Z; an optional python-vX.Y.Z release tag is accepted only when it matches the repository version. Build the pure SDK wheel once and one runtime wheel on each native platform:

version="$(node -p "require('./package.json').version")"
python scripts/build-python-release.py --package sdk --output-dir dist-python
python scripts/build-python-release.py --package runtime --platform macos-arm64 --runtime-exe dist-exe/dsh-jsonrpc-agent-pkg-macos-arm64 --output-dir dist-python
pip install --find-links dist-python deepseek-harness=="$version"

The runtime distribution is wheel-only and rejects sdist builds, missing executables, and mixed-platform payloads. Its three wheel tags are py3-none-manylinux_2_28_x86_64, py3-none-manylinux_2_28_aarch64, and py3-none-macosx_11_0_arm64; the SDK remains py3-none-any. A matching python-vX.Y.Z tag pipeline builds these four non-conflicting files and publishes them together, so a normal pip install deepseek-harness==X.Y.Z selects the matching runtime wheel and import deepseek_harness needs no runtime_bin.

Zero-config semantics

The runtime binary itself always requires an explicit config ($DSH_CORDIS_CONFIG, or a config path as the first argv argument), has no built-in fallback, and boots only what the config lists. Zero-config is SDK wrapper behavior: when the caller uses no explicit channel, the client injects the runtime package's checked-in default configuration (runtime/cordis.yml) via DSH_CORDIS_CONFIG; any explicit channel wins and disables the injection. The full injection conditions live in the sdk README; the default config's contents and the hard semantic in the sdk-runtime README.

The executable is also a supported direct interface; keep stdin open for the NDJSON JSON-RPC exchange and supply a config explicitly:

DSH_CORDIS_CONFIG=/absolute/path/cordis.yml ./dsh-jsonrpc-agent-pkg-macos-arm64

Test layout

test_client.py is fully keyless (a Python fake runtime is the peer). test_bundled_runtime.py boots each bundled carrier and skips per carrier when its artifact is missing. test_runtime_resolution.py covers the carrier-resolution rules without spawning anything.