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feature 96% Confidence Gate September 21, 2026

langgraph==1.2.12

LangGraph version 1.2.12 introduces a response_schema parameter to the interrupt() function. It also includes dependency updates for soupsieve to 2.9 and mistune to 3.3.4.

Verified State Diff

Comparison Mode:
- Previous State
The interrupt() function lacked native support for response_schema, and v3 stream projections had undeclared types.
+ Verified New State
Developers can now enforce structured output schemas within interrupt() calls, and v3 stream projections have explicit type declarations.

Impact & Verification Analysis

WHO IS AFFECTED

Developers building agentic workflows with LangGraph, particularly those utilizing human-in-the-loop interruptions.

WHY IT MATTERS

Adding response_schema to interrupt() allows for more robust, type-safe human-in-the-loop interactions, reducing runtime errors when processing human feedback in agentic state machines.

Full Fact Overview

This release focuses on improving the developer experience for human-in-the-loop workflows by adding schema validation support to the interrupt() mechanism. Additionally, the update addresses technical debt and security hygiene through dependency management, specifically bumping soupsieve and mistune, and resolves a type declaration issue regarding v3 stream projections.

Multi-Source Evidence Chain (1)

langgraph==1.2.12LangGraph
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