symphony-harness
A product-agnostic async agent loop for Python: model turns, callable tools, operational limits, and a typed event stream. Import it as core_harness.
Availability: this package is not currently published on PyPI. Use it through the repository's uv workspace; start with the source installation guide.
Minimal example
import asyncio
from core_ai import build_default_registry, default_model_id
from core_harness import CoreHarness, Tool
def read_file(path: str) -> str:
"""Read a UTF-8 file."""
with open(path, encoding="utf-8") as file:
return file.read()
async def main() -> None:
harness = CoreHarness(
registry=build_default_registry(),
registry=build_default_registry(),
model_id=default_model_id(registry),
system_prompt="Answer concisely and use tools when useful.",
tools=[Tool(read_file)],
)
result = await harness.run("Summarize README.md", session_id="example")
print(result.output_text)
asyncio.run(main())
CoreHarness does not provide a filesystem boundary or default approval policy: attach only tools you intend to expose, and add product-level policy where needed. See SECURITY.md.
Build with the harness
- Harness guide: tools, runs, subagents, limits, and context.
- Extend the harness: add-on hooks and child behavior.
- Event overview and detailed event catalog.
- Background child lifecycle.
- Architecture.
1 maintainer
Metadata
1 maintainer
Release files for symphony-harness 0.0.1
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
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| symphony_harness-0.0.1.tar.gz | 39.9 kB | With provenance | Details |
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| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| symphony_harness-0.0.1-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 95.3 kB
Release files / symphony_harness-0.0.1.tar.gz
| Download URL | symphony_harness-0.0.1.tar.gz |
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| Size | 39.9 kB |
| Tags | Source |
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| Tags | Python 3 |
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SHA-256 checksum How to use checksums |
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Attestation for symphony_harness-0.0.1.tar.gz
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Signed by GitHub Actions, verified by PyPI on Oct 18, 2026.
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