fix: Simplify review explanation: full-width, plain prose, no diff links (#1547)

* Simplify review explanation: full-width, plain prose, no diff links

* Update _build_prompt test for plain diff fences

---------

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

agent/reviewer_groups.py

@@ -52,10 +52,9 @@ class _DiffGroupModel(BaseModel):
     )
     summary: str = Field(
         description=(
-            "GitHub-flavored markdown walkthrough of this group: a few short "
-            "sentences or bullets, code identifiers in `backticks`, optionally one "
-            "short fenced code block of the key snippet, and concrete locations "
-            "linked as [path:start-end](#loc=path:start-end)."
+            "A short, plain explanation of what this group changes and why, in a "
+            "few sentences a reviewer can skim. Wrap code identifiers, symbols, "
+            "types, flags, and paths in `backticks`. No code blocks or links."
         )
     )
     files: list[str] = Field(
@@ -82,24 +81,18 @@ Rules:
 - Use at most {max_groups} groups. Prefer fewer, larger groups over many tiny ones.
 - title: a short headline naming the change, roughly 4-10 words, no trailing \
 punctuation. Wrap code identifiers (symbols, flags, file names) in `backticks`.
-- summary: GitHub-flavored markdown explaining what the group changes and why, \
-written as a short walkthrough a reviewer can skim:
-    - Keep it focused — a few short sentences or bullets. Do not restate the diff line by line.
+- summary: a short, plain explanation of what the group changes and why, that a \
+reviewer can skim:
+    - Keep it focused — a few short sentences. Do not restate the diff line by line.
     - Wrap every code identifier, symbol, type, flag, and path in `backticks`.
-    - When one change is central, include at most ONE short fenced code block \
-(```lang, <= ~8 lines) of the key snippet — not the whole hunk.
-    - Reference concrete locations as markdown links of the EXACT form \
-[path:start-end](#loc=path:start-end), where path is the verbatim changed-file \
-path and start/end are line numbers from the "lines X-Y" annotations below \
-(use [path:line](#loc=path:line) when start == end). Prefer these links over \
-describing locations in prose — they let the reader jump straight to the hunk.
+    - Plain prose only — no code blocks and no links.
 - files: the exact file paths (copied verbatim from the list below) in this \
 group, in the order a reviewer should read them.
 
 Changed files:
 {file_list}
 
-Diffs (each hunk is annotated with its line range in the new file):
+Diffs:
 {diffs}
 """
 
@@ -122,9 +115,7 @@ def _build_prompt(diff_text: str, files: list[str]) -> str:
             body = hunk.body
             if len(body) > MAX_FILE_HUNK_CHARS:
                 body = body[:MAX_FILE_HUNK_CHARS] + "\n... (truncated)"
-            # Surface the new-file line range so the model can cite accurate
-            # locations in its summary links.
-            segments.append(f"lines {hunk.new_start}-{hunk.new_end}:\n```diff\n{body}\n```")
+            segments.append(f"```diff\n{body}\n```")
         block = f"### {file_diff.file}\n" + "\n".join(segments) + "\n"
         if budget - len(block) < 0:
             parts.append(f"### {file_diff.file}\n(diff omitted — prompt budget reached)\n")

tests/test_reviewer_groups.py

@@ -97,14 +97,13 @@ async def test_generate_diff_groups_llm_failure_returns_none() -> None:
     assert groups is None
 
 
-def test_build_prompt_annotates_hunk_line_ranges() -> None:
+def test_build_prompt_includes_files_and_diffs() -> None:
     prompt = _build_prompt(_DIFF, ["foo.py", "bar.py"])
     assert "### foo.py" in prompt
     assert "### bar.py" in prompt
-    # New-file line ranges from the @@ headers are surfaced so the model can
-    # cite accurate locations: foo.py @@ -1,2 +1,3 @@ and bar.py @@ -1 +1,2 @@.
-    assert "lines 1-3:" in prompt
-    assert "lines 1-2:" in prompt
+    # Hunks are rendered as plain diff fences (no line-range annotations).
+    assert "lines 1-3:" not in prompt
+    assert "```diff" in prompt
     # The verbatim file list is included so every file can be assigned.
     assert "- foo.py" in prompt
     assert "- bar.py" in prompt

ui/src/components/agents/ReviewSidebar.tsx

@@ -51,7 +51,6 @@ export interface ReviewSidebarData {
   view: ReviewSidebarView
   onViewChange: (view: ReviewSidebarView) => void
   onSelectGroup: (index: number) => void
-  onLocationClick?: (file: string, startLine: number, endLine: number) => void
 }
 
 const ReviewSidebarContext = createContext<{
@@ -105,7 +104,6 @@ export function ReviewSidebarPanel({ data }: { data: ReviewSidebarData }) {
           groups={data.groups ?? []}
           onSelectGroup={data.onSelectGroup}
           onSelectFile={data.onSelect}
-          onLocationClick={data.onLocationClick}
         />
       ) : !data.files ? (
         <div className="px-4 pt-1">
@@ -183,12 +181,10 @@ function ReviewGroupList({
   groups,
   onSelectGroup,
   onSelectFile,
-  onLocationClick,
 }: {
   groups: Array<ReviewSidebarGroup>
   onSelectGroup: (index: number) => void
   onSelectFile: (path: string) => void
-  onLocationClick?: (file: string, startLine: number, endLine: number) => void
 }) {
   return (
     <div className="min-h-0 flex-1 divide-y divide-[var(--ui-border-subtle)] overflow-y-auto">
@@ -198,7 +194,6 @@ function ReviewGroupList({
           group={group}
           onSelect={() => onSelectGroup(group.index)}
           onSelectFile={onSelectFile}
-          onLocationClick={onLocationClick}
         />
       ))}
     </div>
@@ -211,6 +206,12 @@ function splitPath(path: string): { dir: string; base: string } {
   return { dir: path.slice(0, idx), base: path.slice(idx + 1) }
 }
 
+// Older stored summaries embed `[label](#loc=path:line)` diff links. Render the
+// label as inline code instead so no stale jump-links leak into the explanation.
+function stripLocationLinks(summary: string): string {
+  return summary.replace(/\[([^\]]+)\]\(#loc=[^)]*\)/g, "`$1`")
+}
+
 // Render a title with `backtick`-delimited spans as inline code chips, matching
 // the Markdown component's inline-code styling, without pulling in the full
 // block renderer for a single line.
@@ -234,12 +235,10 @@ function ReviewGroupRow({
   group,
   onSelect,
   onSelectFile,
-  onLocationClick,
 }: {
   group: ReviewSidebarGroup
   onSelect: () => void
   onSelectFile: (path: string) => void
-  onLocationClick?: (file: string, startLine: number, endLine: number) => void
 }) {
   const [expanded, setExpanded] = useState(false)
   return (
@@ -297,7 +296,7 @@ function ReviewGroupRow({
       )}
 
       {group.summary && (
-        <div className="mt-2 pl-7">
+        <div className="mt-2">
           <button
             type="button"
             onClick={() => setExpanded((value) => !value)}
@@ -313,10 +312,7 @@ function ReviewGroupRow({
           </button>
           {expanded && (
             <div className="mt-1.5">
-              <Markdown
-                content={group.summary}
-                onLocationClick={onLocationClick}
-              />
+              <Markdown content={stripLocationLinks(group.summary)} />
             </div>
           )}
         </div>

ui/src/components/agents/ported/Markdown.tsx

@@ -1,6 +1,5 @@
 import { memo, useMemo } from "react";
 import { Streamdown } from "streamdown";
-import { parseLocationHref } from "./markdownLocation";
 import type { ReactNode } from "react";
 import "streamdown/styles.css";
 
@@ -8,12 +7,6 @@ interface MarkdownProps {
   content: string;
   /** When true, keep Streamdown in streaming mode for the duration of the run. */
   isLive?: boolean;
-  /**
-   * When set, `#loc=path:start-end` links render as in-page buttons that invoke
-   * this callback instead of navigating. Used by the review view to jump the
-   * diff to a referenced hunk.
-   */
-  onLocationClick?: (file: string, startLine: number, endLine: number) => void;
 }
 
 /**
@@ -86,37 +79,22 @@ const SHIKI_THEME: ["github-light", "github-dark"] = ["github-light", "github-da
 export const Markdown = memo(function Markdown({
   content,
   isLive = false,
-  onLocationClick,
 }: MarkdownProps) {
   const components = useMemo(
     () => ({
       ...STREAMDOWN_COMPONENTS,
-      a: ({ href, children }: { href?: string; children?: ReactNode }) => {
-        const loc = onLocationClick ? parseLocationHref(href) : null;
-        if (loc && onLocationClick) {
-          return (
-            <button
-              type="button"
-              onClick={() => onLocationClick(loc.file, loc.startLine, loc.endLine)}
-              className="font-mono text-[0.85em] text-[color:var(--ui-accent)] underline decoration-[color:var(--ui-accent)]/50 break-words [overflow-wrap:anywhere]"
-            >
-              {children}
-            </button>
-          );
-        }
-        return (
-          <a
-            className="text-[color:var(--ui-accent)] underline decoration-[color:var(--ui-accent)]/50 break-words [overflow-wrap:anywhere]"
-            href={href}
-            target="_blank"
-            rel="noreferrer"
-          >
-            {children}
-          </a>
-        );
-      },
+      a: ({ href, children }: { href?: string; children?: ReactNode }) => (
+        <a
+          className="text-[color:var(--ui-accent)] underline decoration-[color:var(--ui-accent)]/50 break-words [overflow-wrap:anywhere]"
+          href={href}
+          target="_blank"
+          rel="noreferrer"
+        >
+          {children}
+        </a>
+      ),
     }),
-    [onLocationClick]
+    []
   );
 
   return (

ui/src/components/agents/ported/markdownLocation.test.ts

@@ -1,53 +0,0 @@
-import { describe, expect, it } from "vitest";
-
-import { parseLocationHref } from "./markdownLocation";
-
-describe("parseLocationHref", () => {
-  it("parses a path with a start-end range", () => {
-    expect(parseLocationHref("#loc=src/foo.rs:231-232")).toEqual({
-      file: "src/foo.rs",
-      startLine: 231,
-      endLine: 232,
-    });
-  });
-
-  it("parses a single-line ref (no end)", () => {
-    expect(parseLocationHref("#loc=mod.rs:42")).toEqual({
-      file: "mod.rs",
-      startLine: 42,
-      endLine: 42,
-    });
-  });
-
-  it("tolerates an origin prefix the URL transform may prepend", () => {
-    expect(parseLocationHref("http://localhost/#loc=a/b.ts:5-9")).toEqual({
-      file: "a/b.ts",
-      startLine: 5,
-      endLine: 9,
-    });
-  });
-
-  it("decodes percent-encoded hrefs", () => {
-    expect(parseLocationHref("#loc=a%20b/c.ts:1-2")).toEqual({
-      file: "a b/c.ts",
-      startLine: 1,
-      endLine: 2,
-    });
-  });
-
-  it("clamps an end below the start to a single line", () => {
-    expect(parseLocationHref("#loc=x.ts:10-3")).toEqual({
-      file: "x.ts",
-      startLine: 10,
-      endLine: 10,
-    });
-  });
-
-  it("returns null for non-location and malformed hrefs", () => {
-    expect(parseLocationHref(undefined)).toBeNull();
-    expect(parseLocationHref("https://example.com")).toBeNull();
-    expect(parseLocationHref("#loc=noline")).toBeNull();
-    expect(parseLocationHref("#loc=:5")).toBeNull();
-    expect(parseLocationHref("#loc=x.ts:abc")).toBeNull();
-  });
-});

ui/src/components/agents/ported/markdownLocation.ts

@@ -1,35 +0,0 @@
-export interface MarkdownLocation {
-  file: string;
-  startLine: number;
-  endLine: number;
-}
-
-/**
- * Parse a `#loc=<path>:<start>[-<end>]` sentinel href emitted by the reviewer
- * diff-grouping pass into a file + line range. Tolerant of an origin prefix the
- * markdown URL transform may prepend, and of percent-encoding. Returns null for
- * any href that isn't a location link.
- */
-export function parseLocationHref(href?: string): MarkdownLocation | null {
-  if (!href) return null;
-  const marker = href.indexOf("#loc=");
-  if (marker === -1) return null;
-  let raw = href.slice(marker + "#loc=".length);
-  try {
-    raw = decodeURIComponent(raw);
-  } catch {
-    // Keep raw as-is if it isn't valid percent-encoding.
-  }
-  const colon = raw.lastIndexOf(":");
-  if (colon <= 0) return null;
-  const file = raw.slice(0, colon);
-  const [startStr, endStr] = raw.slice(colon + 1).split("-");
-  const start = Number.parseInt(startStr ?? "", 10);
-  if (!Number.isFinite(start) || start <= 0) return null;
-  const end = endStr !== undefined ? Number.parseInt(endStr, 10) : start;
-  return {
-    file,
-    startLine: start,
-    endLine: Number.isFinite(end) && end >= start ? end : start,
-  };
-}

ui/src/routes/agents/reviews/$owner.$repo.$number.tsx

@@ -222,11 +222,6 @@ function ReviewBody({
   const [anchorEl, setAnchorEl] = useState<HTMLElement | null>(null)
   const scrollRef = useRef<HTMLDivElement | null>(null)
   const groupRefs = useRef<Record<number, HTMLDivElement | null>>({})
-  const [selectedRange, setSelectedRange] = useState<{
-    file: string
-    start: number
-    end: number
-  } | null>(null)
 
   useEffect(() => {
     void warmDiffHighlighter()
@@ -405,21 +400,6 @@ function ReviewBody({
     })
   }, [])
 
-  const scrollToLineRange = useCallback(
-    (file: string, start: number, end: number) => {
-      setSelectedFile(file)
-      setSelectedRange({ file, start, end })
-      setExpandedFiles((prev) => ({ ...prev, [file]: true }))
-      requestAnimationFrame(() => {
-        fileRefs.current[file]?.scrollIntoView({
-          block: "start",
-          behavior: "smooth",
-        })
-      })
-    },
-    []
-  )
-
   const openFinding = useCallback(
     (finding: ReviewFinding) => {
       markRead(finding.id)
@@ -447,7 +427,6 @@ function ReviewBody({
       file={file}
       findings={findingsByFile.get(file.path) ?? []}
       focused={focused}
-      selectedRange={selectedRange}
       viewed={viewed.has(file.path)}
       onToggleViewed={() => {
         const becomingViewed = !viewed.has(file.path)
@@ -485,7 +464,6 @@ function ReviewBody({
       view,
       onViewChange: setView,
       onSelectGroup: scrollToGroup,
-      onLocationClick: scrollToLineRange,
     }),
     [
       detail.number,
@@ -497,7 +475,6 @@ function ReviewBody({
       view,
       setView,
       scrollToGroup,
-      scrollToLineRange,
     ]
   )
   useRegisterReviewSidebar(sidebarData)
@@ -689,7 +666,6 @@ function FileDiffCard({
   file,
   findings,
   focused,
-  selectedRange,
   viewed,
   onToggleViewed,
   expanded,
@@ -701,7 +677,6 @@ function FileDiffCard({
   file: ReviewDiffFile
   findings: Array<ReviewFinding>
   focused: ReviewFinding | null
-  selectedRange: { file: string; start: number; end: number } | null
   viewed: boolean
   onToggleViewed: () => void
   expanded: boolean
@@ -728,16 +703,8 @@ function FileDiffCard({
     if (focused?.file === file.path && isAnchored(focused)) {
       return findingSelectedRange(focused)
     }
-    if (selectedRange?.file === file.path) {
-      return {
-        start: selectedRange.start,
-        end: selectedRange.end,
-        side: "additions",
-        endSide: "additions",
-      }
-    }
     return null
-  }, [focused, selectedRange, file.path])
+  }, [focused, file.path])
 
   return (
     <div