Agent-contracts, contract-based LangGraph agents
Hi HN, I’m the author of agent-contracts, a Python library that explores a contract-based approach to structuring LangGraph agents. When building larger LangGraph-based systems, I kept running into the same issues: - node responsibilities becoming implicit - state dependencies spreading across the graph - routing logic getting harder to reason about - refactoring feeling increasingly risky agent-contracts is an attempt to make these boundaries explicit. Each node declares a contract that describes: - which parts of the state it reads and writes - what external services it depends on - when…
Agent-contracts, contract-based LangGraph agents launched on January 9, 2026 with 8 votes, #1,339 of 14,585 launches that month and more than 75% of that year's launches.
What it does
Build LangGraph agents from contracts—declarative nodes, auto-wired graphs, hybrid rule+LLM routing.
Contract-driven architecture for building LangGraph agents with declarative node definitions, automatic graph construction, and hybrid rule/LLM-based routing. - yatarousan0227/agent-contracts
In the maker’s words, at launch
Hi HN, I’m the author of agent-contracts, a Python library that explores a contract-based approach to structuring LangGraph agents. When building larger LangGraph-based systems, I kept running into the same issues: - node responsibilities becoming implicit - state dependencies spreading across the graph - routing…
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