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Code as Action (CodeAct)(CA)
Instead of emitting one JSON tool call per turn, the agent's action space is executable code that orchestrates tools with loops, conditionals, and variables. A single code block can call many tools, branch on results, and keep intermediate data in the runtime rather than passing every result back through the context window. Anthropic reports roughly a 98 percent token reduction on some multi-tool workflows when tools are called from code via MCP.
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Code as Action (CodeAct)(CA)
Instead of emitting one JSON tool call per turn, the agent's action space is executable code that orchestrates tools with loops, conditionals, and variables. A single code block can call many tools, branch on results, and keep intermediate data in the runtime rather than passing every result back through the context window. Anthropic reports roughly a 98 percent token reduction on some multi-tool workflows when tools are called from code via MCP.
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