diff --git a/ui/src/components/github-link-target.ts b/ui/src/components/github-link-target.ts
index d5666340eaf7..63b95984abf3 100644
--- a/ui/src/components/github-link-target.ts
+++ b/ui/src/components/github-link-target.ts
@@ -13,7 +13,7 @@ export type GitHubLinkTarget = GitHubItemTarget & {
   href: string;
 };
 
-function decodePathSegment(value: string): string | null {
+export function decodeGitHubPathSegment(value: string): string | null {
   try {
     const decoded = decodeURIComponent(value).trim();
     return decoded && decoded !== "." && decoded !== ".." ? decoded : null;
@@ -22,10 +22,10 @@ function decodePathSegment(value: string): string | null {
   }
 }
 
-function parseGitHubItemPath(url: URL): GitHubItemTarget | null {
+export function parseGitHubItemPath(url: URL): GitHubItemTarget | null {
   const segments = url.pathname.split("/").filter(Boolean);
-  const owner = decodePathSegment(segments[0] ?? "");
-  const repo = decodePathSegment(segments[1] ?? "");
+  const owner = decodeGitHubPathSegment(segments[0] ?? "");
+  const repo = decodeGitHubPathSegment(segments[1] ?? "");
   const surface = segments[2];
   const numberText = segments[3] ?? "";
   if (!owner || !repo || !/^[1-9]\d{0,9}$/.test(numberText)) {
@@ -52,35 +52,12 @@ export function parseGitHubLinkTarget(href: string): GitHubLinkTarget | null {
   return target ? { ...target, href: url.href } : null;
 }
 
-export function formatGitHubLinkLabel(url: URL): string {
-  const segments = url.pathname.split("/").filter(Boolean);
-  const item = parseGitHubItemPath(url);
-  if (item && segments.length === 4 && !url.search && !url.hash) {
-    return `#${item.number}`;
-  }
-  if (item) {
-    return url.href;
-  }
-  if (segments.length === 2) {
-    return segments.map((segment) => decodePathSegment(segment) ?? segment).join("/");
-  }
-  if (segments[2] === "blob" && segments.length > 4) {
-    const filename = decodePathSegment(segments.at(-1) ?? "");
-    if (filename) {
-      return filename;
-    }
-  }
-  const fallbackSegments = segments.length > 2 ? segments.slice(2) : segments;
-  const path = fallbackSegments.map((segment) => decodePathSegment(segment) ?? segment);
-  return ["github.com", ...path].join("/");
-}
-
 export function gitHubProfileUrl(login: string): string {
   return `https://${GITHUB_HOST}/${encodeURIComponent(login)}`;
 }
 
-// Built from the parsed parts rather than the source href, which isGitHubItemRootPath
-// shows may already carry its own sub-path, query, or comment fragment.
+// Build from parsed parts because the source href may already carry its own
+// sub-path, query, or comment fragment.
 export function gitHubFilesChangedUrl(target: GitHubItemTarget): string {
   const repoPath = `${encodeURIComponent(target.owner)}/${encodeURIComponent(target.repo)}`;
   return `https://${GITHUB_HOST}/${repoPath}/pull/${target.number}/files`;
diff --git a/ui/src/components/markdown-parser.ts b/ui/src/components/markdown-parser.ts
index 790c82d77211..875b2edfb505 100644
--- a/ui/src/components/markdown-parser.ts
+++ b/ui/src/components/markdown-parser.ts
@@ -3,7 +3,7 @@ import markdownItTaskLists from "markdown-it-task-lists";
 import type Token from "markdown-it/lib/token.mjs";
 import { t } from "../i18n/index.ts";
 import { fileKindForPath, shortestFileLabels } from "./file-kind.ts";
-import { formatGitHubLinkLabel } from "./github-link-target.ts";
+import { decodeGitHubPathSegment, parseGitHubItemPath } from "./github-link-target.ts";
 import {
   installAssistantTranscriptRoleImageRenderer,
   installAssistantTranscriptRoleMarkdown,
@@ -108,6 +108,26 @@ function parseWebLinkHref(href: string): URL | null {
   return url.protocol === "https:" || url.protocol === "http:" ? url : null;
 }
 
+function formatGitHubLinkLabel(url: URL): string {
+  const segments = url.pathname.split("/").filter(Boolean);
+  const item = parseGitHubItemPath(url);
+  if (item) {
+    return segments.length === 4 && !url.search && !url.hash ? `#${item.number}` : url.href;
+  }
+  if (segments.length === 2) {
+    return segments.map((segment) => decodeGitHubPathSegment(segment) ?? segment).join("/");
+  }
+  if (segments[2] === "blob" && segments.length > 4) {
+    const filename = decodeGitHubPathSegment(segments.at(-1) ?? "");
+    if (filename) {
+      return filename;
+    }
+  }
+  const fallbackSegments = segments.length > 2 ? segments.slice(2) : segments;
+  const path = fallbackSegments.map((segment) => decodeGitHubPathSegment(segment) ?? segment);
+  return ["github.com", ...path].join("/");
+}
+
 function isFileLinkBoundaryBefore(value: string, index: number): boolean {
   const char = value[index - 1];
   return char === undefined || /\s/.test(char) || "([{<\"'`".includes(char);
diff --git a/ui/src/components/markdown-tables.test.ts b/ui/src/components/markdown-tables.test.ts
index af9952afc522..225e05e89184 100644
--- a/ui/src/components/markdown-tables.test.ts
+++ b/ui/src/components/markdown-tables.test.ts
@@ -77,16 +77,11 @@ function interactiveOwner(): {
     scrollLeft: { configurable: true, value: 0, writable: true },
     scrollWidth: { configurable: true, value: 300 },
   });
+  owner.addEventListener("click", handleMarkdownTableInteraction);
   enhanceMarkdownTables(owner);
   return { owner, shell, viewport };
 }
 
-function markdownTableInteractionEvent(target: Element): Event {
-  const event = new MouseEvent("click", { bubbles: true });
-  Object.defineProperty(event, "target", { value: target });
-  return event;
-}
-
 describe("Markdown table interactions", () => {
   beforeEach(() => {
     TestMutationObserver.instances = [];
@@ -174,8 +169,7 @@ describe("Markdown table interactions", () => {
     vi.useFakeTimers();
     const { owner } = interactiveOwner();
     const copy = owner.querySelector<HTMLButtonElement>(".markdown-table__copy")!;
-
-    handleMarkdownTableInteraction(markdownTableInteractionEvent(copy));
+    copy.click();
 
     expect(writeText).toHaveBeenCalledWith("Name\tValue\nAlpha\tOne");
     await vi.advanceTimersByTimeAsync(0);
@@ -190,8 +184,7 @@ describe("Markdown table interactions", () => {
     const { owner } = interactiveOwner();
     const expand = owner.querySelector<HTMLButtonElement>(".markdown-table__expand")!;
     expand.focus();
-
-    handleMarkdownTableInteraction(markdownTableInteractionEvent(expand));
+    expand.click();
 
     const dialog = document.querySelector<HTMLDialogElement>(".markdown-table-dialog")!;
     expect(dialog.hasAttribute("open")).toBe(true);
@@ -212,10 +205,7 @@ describe("Markdown table interactions", () => {
     expect(document.querySelector(".markdown-table-dialog")).toBeNull();
     expect(document.activeElement).toBe(expand);
 
-    // Reopen through the handler like every other interaction here: the file
-    // runs in the isolated lane, so no shared-graph document listener exists
-    // to service a raw click().
-    handleMarkdownTableInteraction(markdownTableInteractionEvent(expand));
+    expand.click();
     const reopenedDialog = document.querySelector<HTMLDialogElement>(".markdown-table-dialog")!;
 
     reopenedDialog.querySelector<HTMLButtonElement>(".markdown-table-dialog__close")!.click();