frontend/conversation.js

@@ -0,0 +1,69 @@
+function createConversationPager({ loadPage }) {
+  let state = { comments: [], page: 1, older_page: null, total: 0 };
+  let olderRequest = null;
+
+  const validComments = comments => Array.isArray(comments)
+    ? comments.filter(comment => comment && Number.isInteger(comment.id))
+    : [];
+
+  const unique = comments => {
+    const seen = new Set();
+    return comments.filter(comment => {
+      if (seen.has(comment.id)) return false;
+      seen.add(comment.id);
+      return true;
+    }).sort((left, right) => {
+      const leftTime = Date.parse(left.created_at || '');
+      const rightTime = Date.parse(right.created_at || '');
+      if (Number.isFinite(leftTime) && Number.isFinite(rightTime) && leftTime !== rightTime) {
+        return leftTime - rightTime;
+      }
+      return left.id - right.id;
+    });
+  };
+
+  const snapshot = () => ({ ...state, comments: state.comments.map(comment => ({ ...comment })) });
+
+  return {
+    reset(page) {
+      const comments = unique(validComments(page?.comments));
+      state = {
+        comments,
+        page: Number.isInteger(page?.page) ? page.page : 1,
+        older_page: Number.isInteger(page?.older_page) ? page.older_page : null,
+        total: Number.isInteger(page?.total) ? Math.max(page.total, comments.length) : comments.length,
+      };
+      olderRequest = null;
+      return snapshot();
+    },
+    snapshot,
+    loadOlder() {
+      if (olderRequest) return olderRequest;
+      if (!Number.isInteger(state.older_page)) return Promise.resolve(snapshot());
+      const requestedPage = state.older_page;
+      olderRequest = Promise.resolve(loadPage(requestedPage)).then(page => {
+        state = {
+          comments: unique(validComments(page?.comments).concat(state.comments)),
+          page: Number.isInteger(page?.page) ? page.page : requestedPage,
+          older_page: Number.isInteger(page?.older_page) ? page.older_page : null,
+          total: Number.isInteger(page?.total) ? Math.max(page.total, state.comments.length) : state.total,
+        };
+        return snapshot();
+      }).finally(() => { olderRequest = null; });
+      return olderRequest;
+    },
+    append(comment) {
+      if (!comment || !Number.isInteger(comment.id)) return snapshot();
+      if (!state.comments.some(existing => existing.id === comment.id)) {
+        state = {
+          ...state,
+          comments: state.comments.concat(comment),
+          total: Math.max(state.total + 1, state.comments.length + 1),
+        };
+      }
+      return snapshot();
+    },
+  };
+}
+
+if (typeof module !== 'undefined' && module.exports) module.exports = createConversationPager;

frontend/index.html

@@ -212,6 +212,7 @@ textarea { resize: vertical; min-height: 120px; }
 .pull-sheet-header button, .pull-sheet-actions button, .pull-sheet-actions a, .pull-comment-composer button { min-height:44px; }
 .pull-sheet-content { overflow-wrap:anywhere; white-space:pre-wrap; }
 .pull-file, .pull-comment-card { margin:8px 0; padding:10px; border:1px solid #203a5c; border-radius:10px; }
+.conversation-more { min-height:44px; width:100%; margin:8px 0; }
 .pull-file-toggle, .pull-review-file { min-height:44px; width:100%; }
 .pull-file-toggle { display:flex; justify-content:space-between; align-items:center; gap:8px; text-align:left; }
 .pull-review-file { margin-top:8px; }
@@ -449,8 +450,10 @@ textarea { resize: vertical; min-height: 120px; }
       </div>
       <div id="issue-edit-status" class="small" aria-live="assertive"></div>
     </form>
-    <h2>Recent discussion</h2>
+    <h2>Full conversation</h2>
     <div id="issue-comments"></div>
+    <button class="conversation-more" id="load-older-issue-comments" type="button" hidden>Load older messages</button>
+    <div id="issue-conversation-status" class="small" aria-live="assertive"></div>
     <section class="issue-comment-composer" aria-labelledby="issue-comment-title">
       <h2 id="issue-comment-title">Add comment</h2>
       <textarea id="issue-comment" maxlength="10000" placeholder="Write a comment"></textarea>
@@ -569,7 +572,9 @@ textarea { resize: vertical; min-height: 120px; }
     <h2>Changed files</h2>
     <div class="pull-review-tools"><span id="pull-review-progress" class="small" aria-live="polite">Review progress unavailable.</span><button id="next-unreviewed-pull-file" type="button" disabled>Next unreviewed</button></div>
     <div id="pull-files"></div>
-    <h2>Recent discussion</h2><div id="pull-comments"></div>
+    <h2>Full conversation</h2><div id="pull-comments"></div>
+    <button class="conversation-more" id="load-older-pull-comments" type="button" hidden>Load older messages</button>
+    <div id="pull-conversation-status" class="small" aria-live="assertive"></div>
     <section class="pull-comment-composer" aria-labelledby="pull-comment-title">
       <h2 id="pull-comment-title">Add comment</h2>
       <textarea id="pull-comment" maxlength="10000" placeholder="Write a comment"></textarea>
@@ -657,6 +662,7 @@ textarea { resize: vertical; min-height: 120px; }
 <script src="static/widgets.js"></script>
 <script src="static/my-work.js"></script>
 <script src="static/pick-work.js"></script>
+<script src="static/conversation.js"></script>
 <script src="static/issue-sheet.js"></script>
 <script src="static/create-issue-sheet.js"></script>
 <script src="static/pull-sheet.js"></script>
@@ -713,10 +719,12 @@ textarea { resize: vertical; min-height: 120px; }
   let updateTrigger = null;
   let selectedIssue = null;
   let selectedIssueDetail = null;
+  let issueConversation = null;
   let issueTrigger = null;
   let selectedPull = null;
   let pullTrigger = null;
   let selectedPullDetail = null;
+  let pullConversation = null;
   let pullReviewState = null;
   let creatingIssue = false;
   let findingWork = false;
@@ -1271,13 +1279,32 @@ textarea { resize: vertical; min-height: 120px; }
   }
 
   function renderIssueComment(comment) {
-    return '<div class="issue-comment"><div class="small">' +
+    return '<div class="issue-comment" data-comment-id="' + Number(comment.id || 0) + '"><div class="small">' +
       escapeHtml(comment.author || 'Unknown author') +
       (comment.created_at ? ' · ' + escapeHtml(fmt(comment.created_at)) : '') +
       '</div><div class="issue-sheet-content">' +
       escapeHtml(comment.body || 'No comment body provided.') + '</div></div>';
   }
 
+  function renderIssueConversation(state) {
+    const comments = state?.comments || [];
+    qs('#issue-comments').innerHTML = comments.length ?
+      comments.map(renderIssueComment).join('') : '<div class="muted">No comments yet.</div>';
+    qs('#load-older-issue-comments').hidden = !Number.isInteger(state?.older_page);
+    qs('#issue-conversation-status').textContent = comments.length ?
+      comments.length + ' of ' + Math.max(state.total || 0, comments.length) + ' messages loaded.' : 'No comments yet.';
+  }
+
+  function renderPullConversation(state) {
+    const comments = state?.comments || [];
+    qs('#pull-comments').innerHTML = comments.length ? comments.map(comment =>
+      '<div class="pull-comment-card">' + renderIssueComment(comment) + '</div>'
+    ).join('') : '<div class="muted">No comments yet.</div>';
+    qs('#load-older-pull-comments').hidden = !Number.isInteger(state?.older_page);
+    qs('#pull-conversation-status').textContent = comments.length ?
+      comments.length + ' of ' + Math.max(state.total || 0, comments.length) + ' messages loaded.' : 'No comments yet.';
+  }
+
   async function loadIssueLabelEditor(item, confirmedNames) {
     const list = qs('#issue-label-list');
     const status = qs('#issue-label-status');
@@ -1336,6 +1363,7 @@ textarea { resize: vertical; min-height: 120px; }
     if (!item) return;
     selectedIssue = item;
     selectedIssueDetail = null;
+    issueConversation = null;
     issueTrigger = trigger;
     qs('#issue-sheet').classList.add('open');
     qs('#issue-sheet-key').textContent = item.key || '';
@@ -1345,6 +1373,8 @@ textarea { resize: vertical; min-height: 120px; }
     qs('#issue-labels').textContent = '';
     qs('#issue-assignees').textContent = '';
     qs('#issue-comments').textContent = '';
+    qs('#load-older-issue-comments').hidden = true;
+    qs('#issue-conversation-status').textContent = 'Loading newest messages…';
     qs('#issue-comment').value = issueController.loadDraft(item);
     qs('#issue-comment-status').textContent = '';
     qs('#issue-label-list').textContent = '';
@@ -1371,6 +1401,7 @@ textarea { resize: vertical; min-height: 120px; }
       const detail = await issueController.load(item);
       if (selectedIssue !== item) return;
       selectedIssueDetail = detail;
+      issueConversation = issueController.conversation(item, detail.conversation);
       qs('#issue-sheet-title').textContent = detail.title || 'Assigned issue';
       qs('#issue-sheet-body').textContent = detail.body || 'No description provided.';
       qs('#issue-labels').innerHTML = (detail.labels || []).map(label =>
@@ -1380,8 +1411,7 @@ textarea { resize: vertical; min-height: 120px; }
       loadIssueMilestoneEditor(item, detail.milestone);
       qs('#issue-assignees').textContent = (detail.assignees || []).length ?
         'Assigned to ' + detail.assignees.join(', ') : 'No assignee reported';
-      qs('#issue-comments').innerHTML = (detail.comments || []).length ?
+      renderIssueConversation(issueConversation.snapshot());
-        detail.comments.map(renderIssueComment).join('') : '<div class="muted">No comments yet.</div>';
       qs('#open-issue-gitea').href = detail.url || item.url || '#';
       qs('#issue-sheet-status').textContent = 'Issue ready · ' + (detail.state || 'open');
       qs('#edit-issue-content').disabled = false;
@@ -1408,6 +1438,7 @@ textarea { resize: vertical; min-height: 120px; }
     qs('#issue-sheet').classList.remove('open');
     selectedIssue = null;
     selectedIssueDetail = null;
+    issueConversation = null;
     if (issueTrigger?.isConnected) issueTrigger.focus();
   }
 
@@ -1463,6 +1494,7 @@ textarea { resize: vertical; min-height: 120px; }
     selectedPull = item;
     pullTrigger = trigger;
     selectedPullDetail = null;
+    pullConversation = null;
     pullReviewState = null;
     qs('#pull-sheet').classList.add('open');
     qs('#pull-sheet-key').textContent = item.key || '';
@@ -1473,6 +1505,8 @@ textarea { resize: vertical; min-height: 120px; }
     qs('#pull-review-progress').textContent = 'Loading review progress…';
     qs('#next-unreviewed-pull-file').disabled = true;
     qs('#pull-comments').textContent = '';
+    qs('#load-older-pull-comments').hidden = true;
+    qs('#pull-conversation-status').textContent = 'Loading newest messages…';
     qs('#pull-comment').value = pullController.loadDraft(item);
     qs('#pull-comment-status').textContent = '';
     qs('#pull-ci-state').textContent = 'CI unknown';
@@ -1485,13 +1519,12 @@ textarea { resize: vertical; min-height: 120px; }
       const detail = await pullController.load(item);
       if (selectedPull !== item) return;
       selectedPullDetail = detail;
+      pullConversation = pullController.conversation(item, detail.conversation);
       qs('#pull-sheet-title').textContent = detail.title || 'Assigned pull request';
       qs('#pull-sheet-body').textContent = detail.body || 'No description provided.';
       qs('#pull-ci-state').textContent = 'CI ' + (detail.ci_state || 'unknown');
       renderPullReview(detail);
-      qs('#pull-comments').innerHTML = (detail.comments || []).length ? detail.comments.map(comment =>
+      renderPullConversation(pullConversation.snapshot());
-        '<div class="pull-comment-card">' + renderIssueComment(comment) + '</div>'
-      ).join('') : '<div class="muted">No comments yet.</div>';
       qs('#open-pull-gitea').href = detail.url || item.url || '#';
       qs('#pull-sheet-status').textContent = 'Pull request ready · by ' + (detail.author || 'unknown author');
     } catch (error) {
@@ -1510,6 +1543,7 @@ textarea { resize: vertical; min-height: 120px; }
     qs('#pull-sheet').classList.remove('open');
     selectedPull = null;
     selectedPullDetail = null;
+    pullConversation = null;
     pullReviewState = null;
     if (pullTrigger?.isConnected) pullTrigger.focus();
   }
@@ -2326,6 +2360,22 @@ textarea { resize: vertical; min-height: 120px; }
   qs('#issue-comment').addEventListener('input', event => {
     if (selectedIssue) issueController.saveDraft(selectedIssue, event.target.value);
   });
+  qs('#load-older-issue-comments').addEventListener('click', async () => {
+    if (!issueConversation) return;
+    const button = qs('#load-older-issue-comments');
+    const panel = qs('#issue-sheet .issue-sheet-panel');
+    const previousHeight = panel.scrollHeight;
+    button.disabled = true;
+    qs('#issue-conversation-status').textContent = 'Loading older messages…';
+    try {
+      renderIssueConversation(await issueConversation.loadOlder());
+      panel.scrollTop += panel.scrollHeight - previousHeight;
+    } catch (error) {
+      qs('#issue-conversation-status').textContent = error.message + ' Loaded messages and your draft are safe; retry.';
+    } finally {
+      button.disabled = false;
+    }
+  });
   qs('#save-issue-labels').addEventListener('click', async () => {
     if (!selectedIssue || !lastContextSnapshot) return;
     const editing = selectedIssue;
@@ -2428,9 +2478,7 @@ textarea { resize: vertical; min-height: 120px; }
     qs('#issue-comment-status').textContent = 'Posting comment…';
     try {
       const comment = await issueController.comment(selectedIssue, body);
-      const empty = qs('#issue-comments .muted');
+      if (issueConversation) renderIssueConversation(issueConversation.append(comment));
-      if (empty) empty.remove();
-      qs('#issue-comments').insertAdjacentHTML('beforeend', renderIssueComment(comment));
       qs('#issue-comment').value = '';
       qs('#issue-comment-status').textContent = 'Comment posted.';
     } catch (error) {
@@ -2486,6 +2534,22 @@ textarea { resize: vertical; min-height: 120px; }
     if (selectedPull) openPullSheet(selectedPull, pullTrigger);
   });
   qs('#next-unreviewed-pull-file').addEventListener('click', focusNextUnreviewedPullFile);
+  qs('#load-older-pull-comments').addEventListener('click', async () => {
+    if (!pullConversation) return;
+    const button = qs('#load-older-pull-comments');
+    const panel = qs('#pull-sheet .pull-sheet-panel');
+    const previousHeight = panel.scrollHeight;
+    button.disabled = true;
+    qs('#pull-conversation-status').textContent = 'Loading older messages…';
+    try {
+      renderPullConversation(await pullConversation.loadOlder());
+      panel.scrollTop += panel.scrollHeight - previousHeight;
+    } catch (error) {
+      qs('#pull-conversation-status').textContent = error.message + ' Loaded messages and your draft are safe; retry.';
+    } finally {
+      button.disabled = false;
+    }
+  });
   qs('#pull-comment').addEventListener('input', event => {
     if (selectedPull) pullController.saveDraft(selectedPull, event.target.value);
   });
@@ -2502,8 +2566,7 @@ textarea { resize: vertical; min-height: 120px; }
     qs('#pull-comment-status').textContent = 'Posting comment…';
     try {
       const comment = await pullController.comment(selectedPull, body);
-      qs('#pull-comments .muted')?.remove();
+      if (pullConversation) renderPullConversation(pullConversation.append(comment));
-      qs('#pull-comments').insertAdjacentHTML('beforeend', '<div class="pull-comment-card">' + renderIssueComment(comment) + '</div>');
       qs('#pull-comment').value = '';
       qs('#pull-comment-status').textContent = 'Comment posted.';
     } catch (error) {

frontend/issue-sheet.js

@@ -1,4 +1,4 @@
-function createIssueSheet({ fetchJson, storage, createOperationId = () => globalThis.crypto?.randomUUID?.() || String(Date.now()) + '-' + Math.random() }) {
+function createIssueSheet({ fetchJson, storage, createConversationPager = globalThis.createConversationPager, createOperationId = () => globalThis.crypto?.randomUUID?.() || String(Date.now()) + '-' + Math.random() }) {
   let commentRequest = null;
   let closeRequest = null;
   let releaseRequest = null;
@@ -21,6 +21,15 @@ function createIssueSheet({ fetchJson, storage, createOperationId = () => global
         headers: { Accept: 'application/json' },
       });
     },
+    conversation(item, initialPage) {
+      const pager = createConversationPager({
+        loadPage: page => fetchJson(issuePath(item) + '/comments?page=' + encodeURIComponent(page) + '&limit=20', {
+          headers: { Accept: 'application/json' },
+        }),
+      });
+      pager.reset(initialPage || { comments: [], page: 1, older_page: null, total: 0 });
+      return pager;
+    },
     loadLabels(item) {
       return fetchJson(issuePath(item) + '/labels', {
         headers: { Accept: 'application/json' },

frontend/pull-sheet.js

@@ -37,7 +37,7 @@ function renderFile(file, index, reviewed, escapeHtml) {
     '" aria-pressed="' + String(reviewed) + '">' + (reviewed ? 'Reviewed' : 'Mark reviewed') + '</button></article>';
 }
 
-function createPullSheet({ fetchJson, storage, createOperationId = () => globalThis.crypto?.randomUUID?.() || String(Date.now()) + '-' + Math.random() }) {
+function createPullSheet({ fetchJson, storage, createConversationPager = globalThis.createConversationPager, createOperationId = () => globalThis.crypto?.randomUUID?.() || String(Date.now()) + '-' + Math.random() }) {
   let commentRequest = null;
   let mergeRequest = null;
   const pathFor = item => 'api/v1/repos/' + String(item.repository || '').split('/')
@@ -62,6 +62,15 @@ function createPullSheet({ fetchJson, storage, createOperationId = () => globalT
     load(item) {
       return fetchJson(pathFor(item) + '/detail', { headers: { Accept: 'application/json' } });
     },
+    conversation(item, initialPage) {
+      const pager = createConversationPager({
+        loadPage: page => fetchJson(pathFor(item) + '/comments?page=' + encodeURIComponent(page) + '&limit=20', {
+          headers: { Accept: 'application/json' },
+        }),
+      });
+      pager.reset(initialPage || { comments: [], page: 1, older_page: null, total: 0 });
+      return pager;
+    },
     reviewState,
     toggleReviewed(item, detail, filename) {
       const state = reviewState(item, detail);

src/gitea_proxy.py

@@ -942,10 +942,58 @@ async def update_assigned_issue_milestone(
     }
 
 
+async def issue_conversation_page(
+    repository: str,
+    number: int,
+    page: int | None = None,
+    limit: int = 20,
+) -> dict:
+    """Return one bounded comment page, opening on the newest page by default."""
+    bounded_limit = min(50, max(1, limit))
+    requested_page = max(1, page or 1)
+    path = f"/api/v1/repos/{repository}/issues/{number}/comments"
+
+    async def load(selected_page: int) -> tuple[list, int]:
+        response = await _get_client().get(
+            path,
+            headers=_auth(),
+            params={"limit": bounded_limit, "page": selected_page},
+        )
+        response.raise_for_status()
+        payload = response.json()
+        if not isinstance(payload, list):
+            raise ValueError("Gitea issue comments response was not a list")
+        comments = [item for item in payload if isinstance(item, dict)]
+        try:
+            total = max(len(comments), int(response.headers.get("X-Total-Count", len(comments))))
+        except (TypeError, ValueError):
+            total = len(comments)
+        return comments, total
+
+    comments, total = await load(requested_page)
+    newest_page = max(1, (total + bounded_limit - 1) // bounded_limit)
+    if len(comments) >= total:
+        selected_page = newest_page if page is None else min(requested_page, newest_page)
+        start = (selected_page - 1) * bounded_limit
+        comments = comments[start:start + bounded_limit]
+    else:
+        selected_page = requested_page
+        if page is None and newest_page != requested_page:
+            selected_page = newest_page
+            comments, confirmed_total = await load(selected_page)
+            total = max(total, confirmed_total)
+    return {
+        "comments": [_normalize_issue_comment(item) for item in comments],
+        "page": selected_page,
+        "older_page": selected_page - 1 if selected_page > 1 else None,
+        "total": total,
+    }
+
+
 async def issue_detail(repository: str, number: int) -> dict:
     base = f"repos/{repository}/issues/{number}"
-    issue, comments = await asyncio.gather(
+    issue, conversation = await asyncio.gather(
-        fetch(base), fetch(f"{base}/comments?limit=20&page=1")
+        fetch(base), issue_conversation_page(repository, number)
     )
     if not isinstance(issue, dict):
         raise ValueError("Gitea issue response was not an object")
@@ -953,12 +1001,7 @@ async def issue_detail(repository: str, number: int) -> dict:
     labels: list = labels_value if isinstance(labels_value, list) else []
     assignees_value = issue.get("assignees")
     assignees: list = assignees_value if isinstance(assignees_value, list) else []
-    comments_value: list = comments if isinstance(comments, list) else []
+    normalized_comments = conversation["comments"]
-    normalized_comments = [
-        _normalize_issue_comment(comment)
-        for comment in comments_value
-        if isinstance(comment, dict)
-    ]
     return {
         "repository": repository,
         "number": number,
@@ -984,6 +1027,7 @@ async def issue_detail(repository: str, number: int) -> dict:
             if isinstance(assignee, dict) and isinstance(assignee.get("login"), str)
         ],
         "comments": normalized_comments,
+        "conversation": conversation,
     }
 
 
@@ -1159,10 +1203,10 @@ async def pull_completion_detail(repository: str, number: int) -> dict:
         raise ValueError("Gitea pull request response was not an object")
     head = pull.get("head") if isinstance(pull.get("head"), dict) else {}
     sha = head.get("sha") if isinstance(head.get("sha"), str) else ""
-    files, status, comments, diff_result = await asyncio.gather(
+    files, status, conversation, diff_result = await asyncio.gather(
         fetch(f"{base}/files"),
         fetch(f"repos/{repository}/commits/{sha}/status"),
-        fetch(f"repos/{repository}/issues/{number}/comments?limit=20&page=1"),
+        issue_conversation_page(repository, number),
         fetch_text(
             f"repos/{repository}/pulls/{number}.diff", REVIEW_DIFF_MAX_BYTES
         ),
@@ -1202,11 +1246,8 @@ async def pull_completion_detail(repository: str, number: int) -> dict:
             for item in (files if isinstance(files, list) else [])[:100]
             if isinstance(item, dict) and isinstance(item.get("filename"), str)
         ],
-        "comments": [
+        "comments": conversation["comments"],
-            _normalize_issue_comment(item)
+        "conversation": conversation,
-            for item in (comments if isinstance(comments, list) else [])[:20]
-            if isinstance(item, dict)
-        ],
     }
 
 

src/main.py

@@ -1415,6 +1415,35 @@ async def create_assigned_issue(
     return JSONResponse(result, status_code=201)
 
 
+@app.get("/api/v1/repos/{owner}/{repo}/issues/{number}/comments")
+async def assigned_issue_conversation(
+    owner: str,
+    repo: str,
+    number: int = PathParam(gt=0),
+    page: int | None = Query(default=None, ge=1, le=100),
+    limit: int = Query(default=20, ge=1, le=50),
+):
+    repository = f"{owner}/{repo}"
+
+    async def load_conversation():
+        if not await gitea_proxy.is_assigned_issue(repository, number):
+            raise HTTPException(status_code=404, detail="Assigned issue not found")
+        return await gitea_proxy.issue_conversation_page(repository, number, page, limit)
+
+    try:
+        return await asyncio.wait_for(
+            load_conversation(), timeout=ISSUE_ACTION_TIMEOUT_SECONDS
+        )
+    except HTTPException:
+        raise
+    except Exception:
+        return JSONResponse(
+            {"error": "The conversation could not be loaded. Your draft is safe; please retry."},
+            status_code=503,
+            headers={"Retry-After": "1"},
+        )
+
+
 @app.post("/api/v1/repos/{owner}/{repo}/issues/{number}/comments", status_code=201)
 async def comment_on_assigned_issue(
     comment: IssueComment,
@@ -1587,6 +1616,35 @@ async def assigned_pull_detail(owner: str, repo: str, number: int = PathParam(gt
         )
 
 
+@app.get("/api/v1/repos/{owner}/{repo}/pulls/{number}/comments")
+async def assigned_pull_conversation(
+    owner: str,
+    repo: str,
+    number: int = PathParam(gt=0),
+    page: int | None = Query(default=None, ge=1, le=100),
+    limit: int = Query(default=20, ge=1, le=50),
+):
+    repository = f"{owner}/{repo}"
+
+    async def load_conversation():
+        if not await gitea_proxy.is_assigned_pull(repository, number):
+            raise HTTPException(status_code=404, detail="Assigned pull request not found")
+        return await gitea_proxy.issue_conversation_page(repository, number, page, limit)
+
+    try:
+        return await asyncio.wait_for(
+            load_conversation(), timeout=ISSUE_ACTION_TIMEOUT_SECONDS
+        )
+    except HTTPException:
+        raise
+    except Exception:
+        return JSONResponse(
+            {"error": "The conversation could not be loaded. Your draft is safe; please retry."},
+            status_code=503,
+            headers={"Retry-After": "1"},
+        )
+
+
 @app.post("/api/v1/repos/{owner}/{repo}/pulls/{number}/comments", status_code=201)
 async def comment_on_assigned_pull(
     comment: IssueComment,

tests/test_issue_api.py

@@ -912,6 +912,44 @@ async def test_issue_detail_endpoint_returns_assigned_issue_with_no_store(monkey
     }
 
 
+@pytest.mark.anyio
+async def test_assigned_issue_conversation_endpoint_is_authorized_bounded_and_no_store(monkeypatch):
+    calls = []
+
+    async def assigned(repository, number):
+        calls.append(("assigned", repository, number))
+        return repository == "stackchain/api"
+
+    async def conversation(repository, number, page, limit):
+        calls.append(("conversation", repository, number, page, limit))
+        return {"comments": [{"id": 21}], "page": 2, "older_page": 1, "total": 21}
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_issue", assigned)
+    monkeypatch.setattr(main.gitea_proxy, "issue_conversation_page", conversation)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.get(
+            "/api/v1/repos/stackchain/api/issues/7/comments?page=2&limit=20"
+        )
+        missing = await client.get(
+            "/api/v1/repos/private/secret/issues/7/comments?page=2&limit=20"
+        )
+        invalid = await client.get(
+            "/api/v1/repos/stackchain/api/issues/7/comments?page=999&limit=999"
+        )
+
+    assert response.status_code == 200
+    assert response.headers["cache-control"] == "no-store"
+    assert response.json()["older_page"] == 1
+    assert missing.status_code == 404
+    assert invalid.status_code == 422
+    assert calls == [
+        ("assigned", "stackchain/api", 7),
+        ("conversation", "stackchain/api", 7, 2, 20),
+        ("assigned", "private/secret", 7),
+    ]
+
+
 @pytest.mark.anyio
 async def test_issue_detail_deadline_is_retryable_sanitized_and_cancels_work(monkeypatch):
     cancelled = asyncio.Event()
@@ -1157,9 +1195,79 @@ async def test_gitea_issue_detail_returns_normalized_context_and_recent_comments
                 "url": "https://forge.example/stackchain/api/issues/7#issuecomment-81",
             }
         ],
+        "conversation": {
+            "comments": [
+                {
+                    "id": 81,
+                    "author": "sam",
+                    "body": "Latest update",
+                    "created_at": "2026-08-07T10:00:00Z",
+                    "url": "https://forge.example/stackchain/api/issues/7#issuecomment-81",
+                }
+            ],
+            "page": 1,
+            "older_page": None,
+            "total": 1,
+        },
     }
 
 
+@pytest.mark.anyio
+async def test_gitea_conversation_page_opens_newest_page_and_reports_older_history():
+    requests = []
+
+    async def handler(request):
+        requests.append((request.url.path, request.url.query.decode()))
+        page = request.url.params.get("page")
+        comments = {
+            "1": [{"id": value, "body": f"Comment {value}", "user": {"login": "sam"}}
+                  for value in range(1, 21)],
+            "3": [{"id": value, "body": f"Comment {value}", "user": {"login": "sam"}}
+                  for value in range(41, 48)],
+        }[page]
+        return httpx.Response(200, json=comments, headers={"X-Total-Count": "47"})
+
+    gitea_proxy.start_client(transport=httpx.MockTransport(handler))
+    try:
+        result = await gitea_proxy.issue_conversation_page("stackchain/api", 7)
+    finally:
+        await gitea_proxy.stop_client()
+
+    assert requests == [
+        ("/api/v1/repos/stackchain/api/issues/7/comments", "limit=20&page=1"),
+        ("/api/v1/repos/stackchain/api/issues/7/comments", "limit=20&page=3"),
+    ]
+    assert [comment["id"] for comment in result["comments"]] == list(range(41, 48))
+    assert result["page"] == 3
+    assert result["older_page"] == 2
+    assert result["total"] == 47
+
+
+@pytest.mark.anyio
+async def test_gitea_conversation_page_locally_bounds_unpaginated_gitea_comments():
+    requests = []
+    all_comments = [
+        {"id": value, "body": f"Comment {value}", "user": {"login": "sam"}}
+        for value in range(1, 48)
+    ]
+
+    async def handler(request):
+        requests.append(request.url.query.decode())
+        return httpx.Response(200, json=all_comments, headers={"X-Total-Count": "47"})
+
+    gitea_proxy.start_client(transport=httpx.MockTransport(handler))
+    try:
+        result = await gitea_proxy.issue_conversation_page("stackchain/api", 7)
+    finally:
+        await gitea_proxy.stop_client()
+
+    assert requests == ["limit=20&page=1"]
+    assert [comment["id"] for comment in result["comments"]] == list(range(41, 48))
+    assert result["page"] == 3
+    assert result["older_page"] == 2
+    assert result["total"] == 47
+
+
 @pytest.mark.anyio
 async def test_update_assigned_issue_labels_validates_and_returns_confirmed_labels(monkeypatch):
     calls = []

tests/test_my_work.py

@@ -12,6 +12,7 @@ REVIEW_SHEET = Path(__file__).parents[1] / "frontend" / "review-sheet.js"
 ISSUE_SHEET = Path(__file__).parents[1] / "frontend" / "issue-sheet.js"
 CREATE_ISSUE_SHEET = Path(__file__).parents[1] / "frontend" / "create-issue-sheet.js"
 PULL_SHEET = Path(__file__).parents[1] / "frontend" / "pull-sheet.js"
+CONVERSATION = Path(__file__).parents[1] / "frontend" / "conversation.js"
 PICK_WORK = Path(__file__).parents[1] / "frontend" / "pick-work.js"
 WORK_ROUTE = Path(__file__).parents[1] / "frontend" / "work-route.js"
 
@@ -1569,6 +1570,100 @@ reader.open(item, [item]).then(() => {{
     ]
 
 
+def test_conversation_pager_prepends_older_pages_deduplicates_and_appends_once():
+    script = f"""
+const createConversationPager = require({json.dumps(str(CONVERSATION))});
+let calls = 0;
+const pager = createConversationPager({{
+  loadPage: async page => {{ calls += 1; return {{
+    comments:[{{id:20,body:'duplicate'}},{{id:1,body:'oldest'}}],
+    page, older_page:null, total:3
+  }}; }}
+}});
+pager.reset({{comments:[{{id:20,body:'middle'}},{{id:21,body:'newest'}}],page:2,older_page:1,total:3}});
+const first = pager.loadOlder();
+const duplicate = pager.loadOlder();
+Promise.all([first, duplicate]).then(() => {{
+  pager.append({{id:22,body:'posted'}});
+  pager.append({{id:22,body:'posted'}});
+  process.stdout.write(JSON.stringify({{calls,same:first===duplicate,state:pager.snapshot()}}));
+}});
+"""
+    result = subprocess.run(
+        ["node", "-e", script], check=True, capture_output=True, text=True
+    )
+    output = json.loads(result.stdout)
+    assert output["calls"] == 1
+    assert output["same"] is True
+    assert [comment["id"] for comment in output["state"]["comments"]] == [1, 20, 21, 22]
+    assert output["state"]["older_page"] is None
+    assert output["state"]["total"] == 4
+
+
+def test_conversation_pager_keeps_loaded_messages_when_older_page_fails():
+    script = f"""
+const createConversationPager = require({json.dumps(str(CONVERSATION))});
+const pager = createConversationPager({{loadPage: async () => {{ throw new Error('offline'); }}}});
+pager.reset({{comments:[{{id:21,body:'newest'}}],page:2,older_page:1,total:21}});
+pager.loadOlder().catch(error => process.stdout.write(JSON.stringify({{
+  error:error.message, state:pager.snapshot()
+}})));
+"""
+    result = subprocess.run(
+        ["node", "-e", script], check=True, capture_output=True, text=True
+    )
+    output = json.loads(result.stdout)
+    assert output["error"] == "offline"
+    assert output["state"]["comments"] == [{"id": 21, "body": "newest"}]
+    assert output["state"]["older_page"] == 1
+
+
+def test_issue_sheet_conversation_loads_older_history_through_assigned_boundary():
+    script = f"""
+const createIssueSheet = require({json.dumps(str(ISSUE_SHEET))});
+const createConversationPager = require({json.dumps(str(CONVERSATION))});
+const calls = [];
+const controller = createIssueSheet({{
+  createConversationPager,
+  fetchJson: async url => {{ calls.push(url); return {{comments:[{{id:1}}],page:1,older_page:null,total:21}}; }}
+}});
+const pager = controller.conversation(
+  {{repository:'stackchain/api',number:7}},
+  {{comments:[{{id:21}}],page:2,older_page:1,total:21}}
+);
+pager.loadOlder().then(state => process.stdout.write(JSON.stringify({{calls,state}})));
+"""
+    result = subprocess.run(
+        ["node", "-e", script], check=True, capture_output=True, text=True
+    )
+    output = json.loads(result.stdout)
+    assert output["calls"] == ["api/v1/repos/stackchain/api/issues/7/comments?page=1&limit=20"]
+    assert [comment["id"] for comment in output["state"]["comments"]] == [1, 21]
+
+
+def test_pull_sheet_conversation_loads_older_history_through_assigned_boundary():
+    script = f"""
+const createPullSheet = require({json.dumps(str(PULL_SHEET))});
+const createConversationPager = require({json.dumps(str(CONVERSATION))});
+const calls = [];
+const controller = createPullSheet({{
+  createConversationPager,
+  fetchJson: async url => {{ calls.push(url); return {{comments:[{{id:1}}],page:1,older_page:null,total:21}}; }}
+}});
+const pager = controller.conversation(
+  {{repository:'stackchain/api',number:7}},
+  {{comments:[{{id:21}}],page:2,older_page:1,total:21}}
+);
+pager.loadOlder().then(state => process.stdout.write(JSON.stringify({{calls,state}})));
+"""
+    result = subprocess.run(
+        ["node", "-e", script], check=True, capture_output=True, text=True
+    )
+    output = json.loads(result.stdout)
+    assert output["calls"] == ["api/v1/repos/stackchain/api/pulls/7/comments?page=1&limit=20"]
+    assert [comment["id"] for comment in output["state"]["comments"]] == [1, 21]
+
+
 def test_issue_sheet_loads_encoded_assigned_issue_detail_path():
     script = f"""
 const createIssueSheet = require({json.dumps(str(ISSUE_SHEET))});
@@ -1860,6 +1955,12 @@ async def test_assigned_pulls_open_accessible_mobile_completion_sheet():
     assert 'id="pull-files"' in html and 'id="pull-comments"' in html
     assert 'id="pull-review-progress"' in html and 'aria-live="polite"' in html
     assert 'id="next-unreviewed-pull-file"' in html
+    assert 'id="load-older-pull-comments"' in html
+    assert 'id="pull-conversation-status"' in html and 'aria-live="assertive"' in html
+    assert '<script src="static/conversation.js"></script>' in html
+    assert "pullController.conversation(item, detail.conversation)" in html
+    assert "pullConversation.loadOlder()" in html
+    assert "pullConversation.append(comment)" in html
     assert 'id="pull-comment"' in html and 'maxlength="10000"' in html
     assert 'id="merge-pull"' in html and 'id="open-pull-gitea"' in html
     assert '<script src="static/pull-sheet.js"></script>' in html
@@ -1885,6 +1986,12 @@ async def test_assigned_issues_open_accessible_mobile_action_sheet_with_safe_mut
     assert 'id="issue-sheet-body"' in html
     assert 'id="issue-labels"' in html and 'id="issue-assignees"' in html
     assert 'id="issue-comments"' in html
+    assert 'id="load-older-issue-comments"' in html
+    assert 'id="issue-conversation-status"' in html and 'aria-live="assertive"' in html
+    assert "issueController.conversation(item, detail.conversation)" in html
+    assert "issueConversation.loadOlder()" in html
+    assert "issueConversation.append(comment)" in html
+    assert '.conversation-more { min-height:44px;' in html
     assert 'id="issue-comment"' in html and 'maxlength="10000"' in html
     assert 'id="send-issue-comment"' in html
     assert 'id="close-issue"' in html

tests/test_pull_api.py

@@ -94,6 +94,40 @@ async def test_gitea_assigned_pull_detail_includes_bounded_diff_previews():
     assert "+new" in detail["files"][0]["diff_lines"]
     assert detail["files"][1]["diff_binary"] is True
     assert detail["files"][1]["diff_available"] is False
+    assert detail["conversation"] == {
+        "comments": [], "page": 1, "older_page": None, "total": 0
+    }
+
+
+@pytest.mark.anyio
+async def test_assigned_pull_conversation_endpoint_reuses_issue_thread_with_pull_authorization(monkeypatch):
+    calls = []
+
+    async def assigned(repository, number):
+        calls.append(("assigned", repository, number))
+        return True
+
+    async def conversation(repository, number, page, limit):
+        calls.append(("conversation", repository, number, page, limit))
+        return {"comments": [{"id": 41}], "page": 3, "older_page": 2, "total": 47}
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_pull", assigned)
+    monkeypatch.setattr(main.gitea_proxy, "issue_conversation_page", conversation)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.get(
+            "/api/v1/repos/stackchain/api/pulls/7/comments?page=3&limit=20"
+        )
+
+    assert response.status_code == 200
+    assert response.headers["cache-control"] == "no-store"
+    assert response.json() == {
+        "comments": [{"id": 41}], "page": 3, "older_page": 2, "total": 47
+    }
+    assert calls == [
+        ("assigned", "stackchain/api", 7),
+        ("conversation", "stackchain/api", 7, 3, 20),
+    ]
 
 
 @pytest.mark.anyio