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fast-rlm is an open-source Python tool that allows LLMs to operate within an RLM harness for recursive subagent calls, with features like spend limits and live log streaming.
New `fast-rlm` update introduces REPL Tool Calling, allowing agents to invoke Python functions via REPL with outputs stored in variables. Demo shows web search and Goodreads review integration.
fast-rlm v1.14 introduces direct Python function injection for tool calling, accepts any Python dict as input, guarantees structured output via schema declaration, and allows agents to call subagents.