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techdeep-diveOMP Internals Deep Dive

OMP hashline edit & noop-loop-guard: Why file edits must be hash-anchored, and how 182/205 byte-identical no-op retries were tamed

OMP replaces traditional line-number patches with hashline: 4-hex content hash + N* syntactic block locators eliminate whitespace drift. noop-loop-guard tracks per-session, per-canonical-path, per-input-hash consecutive no-ops; after 3 (NOOP_HARD_LIMIT) it throws a ToolError so the agent loop sees a tool failure — breaking the model's 182/205 retry loop from issue #2081 where soft hints were completely ignored.

#omp#hashline#edit-tool#noop-loop-guard#coding-agent#typescript
aideep-dive跟成熟 coding agent 學設計

Learning Design from Mature Coding Agents (10): Edit Tool Trade-offs — unified diff, exact edit, hashline, and whole-file

LLMs break unified diffs on bookkeeping: wrong hunk counts, hallucinated context lines. The five reference projects split into two camps — simplify the diff grammar (Codex drops line numbers), or drop diffs entirely (Claude Code/Pi/OpenCode exact replace); OMP goes further by binding read state into the format via hash anchors. looplane took the minimal-intervention path: keep the guarded apply_patch, add a zero-fuzzy replace_text, and its qwen3:4b eval went from stable failure to 5/5.

#coding-agent#harness-engineering#edit-tool#unified-diff#llm#tool-design