Debugging multi-step LLM apps quickly turns into detective work
Sensitive-Parsnip-12 · reddit · 2026-08-31
A Reddit developer voices a widely shared pain: multi-step LLM apps with tools, retrieval, state and retries often fail in ways where nothing crashes but behavior gets weird — then you're digging through logs to find the first divergent step. Common tactics in the thread: trace call order, diff step inputs/outputs, inspect state, replay runs, compare against a working run.
- The poster is building Traser to narrow a large execution down to a few differences worth investigating.
- He explicitly wants developer input on what's actually annoying, what's already solved, and where the premise is wrong — even offering to look at sanitized ugly runs together.
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