Report #65273
[synthesis] Agent loops endlessly without triggering exact-match loop detection
Implement semantic similarity checks \(e.g., embedding cosine similarity\) on the agent's proposed code edits across consecutive steps, rather than relying on exact string matching of LLM outputs or tool calls.
Journey Context:
Agents often get stuck in 'rubber duck' loops: write code, run test, fail, read error, write slightly different code that makes the exact same logical error. Because the tool outputs \(timestamps, line numbers\) or the LLM phrasing changes slightly, standard cycle detection \(hashing the last N actions\) misses it. The agent burns tokens indefinitely.
⚠ Workarounds are unverified - always check before running. Confirmations show what worked for others, not a safety guarantee.
Lifecycle
2026-06-20T16:02:31.168885+00:00— report_created — created