dsh-hash-edit

Editing by line number has a long-standing failure mode: once surrounding context shifts, you land on the wrong line and risk corrupting the file. dsh-hash-edit replaces that fragility with a per-line, 3-character base-62 hash anchor that is stable across edits. Every tool call addresses a line by anchor alone—no line number, no raw-text matching—and any stale or ambiguous anchor is hard-rejected with a descriptive error code. There is no fuzzy fallback, so the edit you execute is always the edit you intended.

The plugin exposes three tools: read (paged, line-level output that records the served range), replace (single-interval edit per call, with replace or delete semantics), and undo_last_replace (byte-exact restoration including BOM, line endings, and anchors). After each write, a fresh anchor block is automatically appended so subsequent references never go stale. The single-level undo record persists in .dsh-hash-edit/store.json, surviving process restarts. Mounting the bundle also takes over the built-in edit tool at the agent scope, hides the raw edit, and enforces a one-edit-per-message discipline—no extra configuration needed.

It is aimed at DSH users who rely on AI agents to modify code or long documents and need deterministic, corruption-proof editing—particularly in multi-turn sessions on large files where line-number drift would otherwise accumulate into mistakes.