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docs(langchain): document interrupt_when on HITL middleware

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Nick Hollon
2026-05-12 15:46:34 -07:00
parent 579b1e24e7
commit 700d420755
1 changed files with 9 additions and 2 deletions
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libs/langchain_v1/langchain/agents/middleware/human_in_the_loop.py
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@@ -232,8 +232,15 @@ class HumanInTheLoopMiddleware(AgentMiddleware[StateT, ContextT, ResponseT]):
* `InterruptOnConfig` indicates the specific decisions allowed for this
tool.
The `InterruptOnConfig` can include a `description` field (`str` or
`Callable`) for custom formatting of the interrupt description.
The `InterruptOnConfig` can include:
- a `description` field (`str` or `Callable`) for custom formatting
of the interrupt description, and
- an `interrupt_when` predicate `(ToolCall, ToolRuntime) -> bool`.
When set, only calls for which the predicate returns `True`
interrupt. Calls returning `False` are auto-approved exactly as
if the tool were not listed in `interrupt_on`. Predicates must be
synchronous and deterministic (LangGraph interrupt replay re-runs
them on resume).
description_prefix: The prefix to use when constructing action requests.
This is used to provide context about the tool call and the action being