dsh-hashline-edittool: An Anchor-Based File Editing Plugin for DeepSeek Harness

What Does It Do?

dsh-hashline-edittool is a DSH plugin for DeepSeek Harness that provides line-anchored edit tools using variable-length Base62 content anchors instead of line numbers or old-code echo. It solves the high token cost and high failure rate of traditional str_replace edits, where models must re-type old code token-for-token. Its core capabilities include anchor-based editing, exact verification, and chained edit support. Maintained by hyperion2144 under the MIT license, last updated 2026-09.

Core Features

• Anchor-based editing: each line gets a unique variable-length Base62 anchor (2 chars for the first 3,844 lines), edits target anchors instead of old text, reducing edit tokens.
• Exact verification: every edit range is checked against what the model saw, so wrong-line edits cannot silently land; failures return fresh anchors.
• Chained edits: post-edit diff rows carry new anchors, enabling consecutive edits without re-reading the file.
• Flexible operations: supports ins, del, replace semantics; replace can omit anchor_end for single-line replacement, multi-line replacement requires explicit range.
• Session-stable anchors: anchors remain stable within a session, edits above do not affect lower anchors.

How to Use This Plugin?

After enabling it in DSH, the read tool returns lines with anchors (default separator is colon), and the response starts with an ANCHOR:FILELINE header. To edit, specify anchor ranges and operation semantics via an edits array; for example, a replace operation can omit anchor_end for a single-line replace, while multi-line replace requires both anchors. This plugin is best for long sessions and structural edits, not for one-line touch-ups or new files.