dsh-approval-diff

A DeepSeek Harness (DSH)
plugin: install it into a profile alongside your own plugins.

See what you approve. When the model asks permission to change a file, the
native card shows the tool arguments: old_string and new_string as raw
text, no file context, no line numbers. This plugin replaces that ask with a
real diff review: red and green lines side by side, word-level highlights
inside changed lines, surrounding file content with true line numbers, and
exactly two buttons.

Plugin value proposition

What you get

• True line diffs for edit: LCS line matching plus word-level highlights;
  unchanged lines inside an edit's operands render as context, not as changes
• Split or Unified view (GitHub style toggle, choice remembered); unified
  groups each change run as all removed lines, then all added
• New files (write) render one-sided, all green; deletions (rm and
  friends) render the full current file in red before you decide
• Consecutive edits to the same file merge into one diff and one decision
• Two buttons, Reject and Allow, scoped to exactly what the card shows
• Requests that cannot succeed are never shown to you
• Minimize collapses the card without deciding; the close button hands that
  request back to the native card

How to install

Requires a DeepSeek Harness checkout and a profile (here web):

# from the harness checkout
pnpm dsh plugin --profile web add /path/to/dsh-approval-diff

# verify the profile still composes
pnpm dsh --profile web --dump-config

Restart the harness after installing: the host half loads at boot. The
client half hot-reloads once installed.

Tests

node test/client.test.mjs

47 checks: host route contract, chain selection, diff rendering (split and
unified), context dedup, per-file scoping, run merging and queued delivery,
doom detection, dismissal and fallthrough.

Limitations

• File-changing approvals only (edit, write, deletion-only bash).
  Everything else is the native card's job.
• Deletion review reads targets from disk; glob targets render as the
  pattern.
• One approval at a time, matching the native card's behavior.