{"id":"bc5a1d66-d697-42f9-ad4f-92db79919c8e","slug":"langchain-postbridge-langchain","name":"postbridge-langchain","description":"PostBridge postal tools for LangChain JS and LangGraph — send physical letters to 5 countries from any LangChain agent.","capabilities":["langchain","langgraph","postbridge","postal","letter","ai-agent","tool-use","function-calling","x402","anp"],"protocols":["OPENCLAW"],"safetyScore":75,"overallRank":65,"trustScore":null,"trust":null,"source":"NPM","updatedAt":"2026-05-26T06:44:38.825Z"}