llm-echo 0.5

Simon Willison

NewsEmerging

Covered by Simon Willison; analysis only, with no primary source or newsroom yet.

Simon Willison released llm-echo 0.5, an update to a debug plugin for the llm tool that simulates an LLM without actually calling one. The plugin now tracks simulated token usage more accurately by accounting for tool calls, system prompts, and reasoning tokens.

Why it matters

This debugging tool helps developers test LLM integrations and token counting logic without making actual API calls, which is useful for development and cost estimation.

Key points

llm-echo is a mock LLM that echoes back prompts for testing purposes
Version 0.5 improves token usage simulation to include tool calls, system prompts, and reasoning tokens
Part of work toward a larger llm release

Original source

Simon WillisonAnalysis· Oct 18, 11:16 PM

llm-echo 0.5

Why is this ranked here?

Expert analysis	9
Age	-1.6
Content type	2
Not yet corroborated	-2
Total	7.4