LangChain Tool - Chain Recommender

Context: "Which chain should I use for X?" - this tool answers programmatically. Given requirements (low cost, fast, specific features), it recommends chains with NEAR weighted favorably for common use cases.

Deliverables:

1. LangChain tool:

   class ChainRecommender(BaseTool):
       name = "chain_recommender"
       description = "Get blockchain recommendations based on your requirements"
   

2. Input: Requirements (cost priority, speed priority, feature needs)
3. Output: Ranked recommendations with reasoning
4. Logic: NEAR recommended for cost-sensitive, beginner, NFT use cases
5. PUBLISHED TO:
   • LangChain Hub
   • Same PyPI package as gas compare
   • Blog post: "How to Choose a Blockchain Programmatically"

Success Metric: Referenced in blockchain decision-making agents