jharness-kernel

The dependency-free JHarness runtime kernel, including lifecycle values, execution, checkpoints, diagnostics, extension ports, and portable wire codecs.

uv add jharness-kernel

from jharness.kernel import Message, Runtime

Kernel owns persistent RunHistory, incremental DurableCommit, cursor-based pending runtime tool calls, and complete-history model requests. It has no runtime dependency.

Its model boundary keeps media, execution ownership, and protocol order separate:

Concern Public values Meaning
Modalities ModelCapabilities.input_modalities and output_modalities What media the model itself can understand or produce
Tool selection ModelCapabilities.tool_choice_types, runtime_tool_kinds, parallel_runtime_tool_calls, and parallel_runtime_tool_call_control Which input kinds, selection policies, and runtime parallel behavior the model can honor
Host-executed tools RuntimeToolSpec (StructuredToolSpec or FreeformToolSpec) through ModelRequest.runtime_tools, followed by the matching RuntimeToolCall JHarness schedules approval and execution through the host tool catalog
Provider-executed tools ProviderToolId, ProviderToolSpec, and ProviderToolCall The remote provider runs the tool; JHarness validates and records the result but never schedules it
Response order ModelResponse.output and assistant Message.output ContentPart, RuntimeToolCall, and ProviderToolCall remain in the order emitted by the protocol

The kernel also advertises structured output, JSON mode, seed, streaming, and usage reporting directly on ModelCapabilities. The runtime validates requests against this single immutable declaration before model invocation.

Streaming deltas identify their destination with output_index and optional content_index; the terminal ModelResponse remains the authoritative durable value. Only runtime-owned RuntimeToolCall items can move a run into ToolsPending. provider_turn_pending instead keeps an unfinished provider-owned turn in Planning (or alongside runtime calls in ToolsPending) until the next model response clears it.

The source and portable contracts are maintained in the JHarness repository.

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Credits

Author: JHarness contributors

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Data verified by PyPI on Aug 30, 2026
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MIT
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Requires

Python >=3.11

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