A controlled study comparing Model Context Protocol (MCP) and command-line interfaces (CLI) for language agents found that agents given matched capabilities across the two interfaces exhibit different behaviors, according to the paper's headline and abstract. The research frames the model-to-tool interface as part of the agent's decision process, since both MCP and CLI can expose the same semantic operations through different interaction surfaces. The work bears on how developers choose to wire agents to external tools and environments.
Language agents increasingly act through external tools and interactive environments, making the interface between the model and its executable capabilities part of the decision process. Model Context Protocol (MCP) and command-line interfaces (CLI) can expose the same semantic operations through ma
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