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• What: Given a small argument graph (nodes/edges), OpenLine returns a verifiable receipt (claim/because/but/so + guardrails + telemetry). • Why: Tracing is descriptive; receipts are normative. They make agent steps auditable & safe by default. • How: stdlib Python; MCP JSON-RPC stub; LangGraph node; schema + validator; optional signing step; GitHub Actions + Pages. Repo: https://github.com/terryncew/openline-core Demo: https://terryncew.github.io/COLE-Coherence-Layer-Engine-/nca... Would love feedback on the guard checks and the OLP schema—where should it grow?

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Show HN: OpenLine – a tiny receipt layer for agents (MCP/LangGraph ready)