llm-echo 0.5 发布：模拟 token 计数纳入工具调用与推理 token

llm-echo 0.5

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Simon Willison 发布 llm-echo 0.5，这个调试插件提供一个不涉及 LLM、只回显提示词的“模型”。新版本模拟的 token 用量开始计入工具调用、系统提示词和推理 token。示例中 `llm -m echo 'hi there' -o thinking 1 --usage` 的输出显示为 2 input、24 output。

正文

I'm working towards a new LLM release, and testing PRs caused me to revisit the llm-echo debug plugin. This plugin provides a "model" which doesn't involve an LLM at all - it just repeats back the prompts that have been fed to it. The new release now updates the simulated token usage counts to take tool calls, system prompts, and reasoning tokens into account.

Example usage:

uvx --with llm-echo llm -m echo 'hi there' -o thinking 1 --usage

Outputs:

First I consider the prompt, then I decide what to say.
{
  "prompt": "hi there",
  "system": "",
  "attachments": [],
  "stream": true,
  "previous": []
}
Token usage: 2 input, 24 output

来源：Simon Willison · simonwillison.net