diff --git a/README.md b/README.md
index fa4a926..4678a9e 100644
--- a/README.md
+++ b/README.md
@@ -16,10 +16,13 @@ python3 -m pip install -r requirements.txt
 Point the dashboard at the Gitea server root (without `/api/v1`) and provide a
 token that can read dashboard data, update the authenticated user's notification
 threads, create and self-assign issues, create issue comments, close assigned
-issues, and submit pull-request reviews. Pull-request replies and mobile My Work
-issue comments use Gitea's issue-comment API; mobile issue capture requires issue
-creation and assignment permission, while closing an assigned issue and native
-Comment, Approve, and Request changes reviews require repository write permission.
+issues, inspect/comment on assigned pull requests, merge assigned pull requests, and
+submit pull-request reviews. Pull-request replies and mobile My Work issue and PR
+comments use Gitea's issue-comment API; mobile issue capture requires issue
+creation and assignment permission. Closing an assigned issue, native Comment,
+Approve, and Request changes reviews, and assigned-PR merge require repository
+write permission. The dashboard rechecks the current pull-request head, CI success,
+draft state, and mergeability immediately before every merge.
 Serve the dashboard
 only to trusted users on its own origin; cross-origin API
 access is intentionally disabled. Then start the API and bundled frontend:
diff --git a/frontend/index.html b/frontend/index.html
index a686200..91064b0 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -139,6 +139,17 @@ textarea { resize: vertical; min-height: 120px; }
 .create-issue-form label { display:grid; gap:6px; }
 .create-issue-form select { min-height:44px; padding:8px; border-radius:8px; border:1px solid #1f3a5f; background:#0b1526; color:#e5e7eb; }
 .create-issue-actions { position:sticky; bottom:0; display:grid; gap:8px; padding:10px 0; padding-bottom:calc(10px + env(safe-area-inset-bottom)); background:#0b1526; }
+.pull-sheet { position:fixed; inset:0; z-index:58; display:none; justify-content:flex-end; background:rgba(5,12,21,.72); backdrop-filter:blur(4px); }
+.pull-sheet.open { display:flex; }
+.pull-sheet-panel { width:min(560px,100%); height:100dvh; overflow:auto; padding:18px; padding-bottom:calc(90px + env(safe-area-inset-bottom)); background:#0b1526; border-left:1px solid #2a496e; }
+.pull-sheet-header { display:flex; align-items:center; justify-content:space-between; gap:10px; }
+.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; }
+.pull-comment-composer textarea { width:100%; min-height:110px; resize:vertical; }
+.pull-sheet-actions { position:sticky; bottom:0; display:grid; grid-template-columns:1fr 1fr; gap:8px; padding:10px 0; padding-bottom:calc(10px + env(safe-area-inset-bottom)); background:#0b1526; }
+.pull-sheet-actions a { display:grid; place-items:center; border:1px solid #60a5fa; border-radius:10px; font-weight:700; }
+.pull-retry { min-height:44px; width:100%; margin-top:10px; }
 @media (max-width: 600px) {
   header { align-items:flex-start; }
   .my-work { margin:0; }
@@ -149,6 +160,7 @@ textarea { resize: vertical; min-height: 120px; }
   .update-sheet-panel { width:100%; border-left:0; padding:14px; }
   .issue-sheet-panel { width:100%; border-left:0; padding:14px; }
   .create-issue-panel { width:100%; border-left:0; padding:14px; }
+  .pull-sheet-panel { width:100%; border-left:0; padding:14px; }
 }
 .obi { width:14px; height:14px; background: url('data:image/svg+xml;utf8,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 24 24%22><rect width=%2224%22 height=%2224%22 rx=%226%22 fill=%22%230b1526%22/><circle cx=%2212%22 cy=%2212%22 r=%226%22 fill=%22%2360a5fa%22/></svg>') center/contain no-repeat; display:inline-block; }
 .footer { padding: 12px; text-align: center; color:#4e6b8a; font-size:12px; }
@@ -365,6 +377,31 @@ textarea { resize: vertical; min-height: 120px; }
   </section>
 </div>
 
+<div class="pull-sheet" id="pull-sheet" role="dialog" aria-modal="true" aria-labelledby="pull-sheet-title">
+  <section class="pull-sheet-panel">
+    <div class="pull-sheet-header">
+      <div><div class="small" id="pull-sheet-key"></div><h3 id="pull-sheet-title">Assigned pull request</h3></div>
+      <button id="close-pull-sheet" type="button">Close</button>
+    </div>
+    <div id="pull-sheet-status" class="small" aria-live="polite">Choose a pull request.</div>
+    <button class="pull-retry" id="retry-pull-load" type="button" hidden>Retry loading pull request</button>
+    <div class="row"><span class="pill" id="pull-ci-state">CI unknown</span><span class="pill" id="pull-merge-state">Checking merge status</span></div>
+    <p class="pull-sheet-content" id="pull-sheet-body"></p>
+    <h2>Changed files</h2><div id="pull-files"></div>
+    <h2>Recent discussion</h2><div id="pull-comments"></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>
+      <button id="send-pull-comment" type="button">Post comment</button>
+      <div id="pull-comment-status" class="small" aria-live="assertive"></div>
+    </section>
+    <div class="pull-sheet-actions">
+      <button id="merge-pull" type="button" disabled>Merge</button>
+      <a id="open-pull-gitea" href="#" target="_blank" rel="noopener noreferrer">Open in Gitea</a>
+    </div>
+  </section>
+</div>
+
 <div class="review-sheet" id="review-sheet" role="dialog" aria-modal="true" aria-labelledby="review-sheet-title">
   <section class="review-sheet-panel">
     <div class="review-sheet-header">
@@ -418,6 +455,7 @@ textarea { resize: vertical; min-height: 120px; }
 <script src="static/my-work.js"></script>
 <script src="static/issue-sheet.js"></script>
 <script src="static/create-issue-sheet.js"></script>
+<script src="static/pull-sheet.js"></script>
 <script src="static/review-sheet.js"></script>
 <script src="static/context-poller.js"></script>
 <script>
@@ -465,6 +503,9 @@ textarea { resize: vertical; min-height: 120px; }
   let updateTrigger = null;
   let selectedIssue = null;
   let issueTrigger = null;
+  let selectedPull = null;
+  let pullTrigger = null;
+  let selectedPullDetail = null;
   let creatingIssue = false;
   let progress = null;
   let draft = null;
@@ -483,6 +524,7 @@ textarea { resize: vertical; min-height: 120px; }
   const reviewController = createReviewController({ fetchJson: fetchReviewJson });
   const issueController = createIssueSheet({ fetchJson: fetchReviewJson, storage: localStorage });
   const issueCapture = createIssueCapture({ fetchJson: fetchReviewJson, storage: localStorage });
+  const pullController = createPullSheet({ fetchJson: fetchReviewJson, storage: localStorage });
 
   function setStatus(msg) { qs('#status').textContent = msg || 'Live'; }
   function setClock() { qs('#clock').textContent = fmt(new Date()); }
@@ -713,6 +755,9 @@ textarea { resize: vertical; min-height: 120px; }
       if (item.kind === 'issue') {
         return '<article class="my-work-card"><button class="my-work-card-main issue-trigger" data-issue-index="' + index + '">' + contents + '</button>' + readUpdate + markRead + '</article>';
       }
+      if (item.kind === 'pull') {
+        return '<article class="my-work-card"><button class="my-work-card-main pull-trigger" data-pull-index="' + index + '">' + contents + '</button>' + readUpdate + markRead + '</article>';
+      }
       return '<article class="my-work-card"><a class="my-work-card-main" href="' + escAttr(item.url) + '" target="_blank" rel="noopener noreferrer">' + contents + '</a>' + readUpdate + markRead + '</article>';
     }).join('') : '<div class="muted">No ' + (selectedWorkFilter === 'review' ? 'reviews' : (selectedWorkFilter === 'update' ? 'unread updates' : (selectedWorkFilter === 'all' ? 'work' : selectedWorkFilter + ' items'))) + '.</div>';
     document.querySelectorAll('[data-review-index]').forEach(button => {
@@ -721,6 +766,9 @@ textarea { resize: vertical; min-height: 120px; }
     document.querySelectorAll('[data-issue-index]').forEach(button => {
       button.addEventListener('click', () => openIssueSheet(lastMyWork[Number(button.dataset.issueIndex)], button));
     });
+    document.querySelectorAll('[data-pull-index]').forEach(button => {
+      button.addEventListener('click', () => openPullSheet(lastMyWork[Number(button.dataset.pullIndex)], button));
+    });
     document.querySelectorAll('[data-update-index]').forEach(button => {
       button.addEventListener('click', () => {
         const item = lastMyWork[Number(button.dataset.updateIndex)];
@@ -846,6 +894,60 @@ textarea { resize: vertical; min-height: 120px; }
     if (issueTrigger?.isConnected) issueTrigger.focus();
   }
 
+  async function openPullSheet(item, trigger) {
+    if (!item) return;
+    selectedPull = item;
+    pullTrigger = trigger;
+    selectedPullDetail = null;
+    qs('#pull-sheet').classList.add('open');
+    qs('#pull-sheet-key').textContent = item.key || '';
+    qs('#pull-sheet-title').textContent = item.title || 'Assigned pull request';
+    qs('#pull-sheet-status').textContent = 'Loading pull request…';
+    qs('#pull-sheet-body').textContent = '';
+    qs('#pull-files').textContent = '';
+    qs('#pull-comments').textContent = '';
+    qs('#pull-comment').value = pullController.loadDraft(item);
+    qs('#pull-comment-status').textContent = '';
+    qs('#pull-ci-state').textContent = 'CI unknown';
+    qs('#pull-merge-state').textContent = 'Checking merge status';
+    qs('#merge-pull').disabled = true;
+    qs('#retry-pull-load').hidden = true;
+    qs('#open-pull-gitea').href = item.url || '#';
+    qs('#close-pull-sheet').focus();
+    try {
+      const detail = await pullController.load(item);
+      if (selectedPull !== item) return;
+      selectedPullDetail = detail;
+      const eligibility = createPullSheet.mergeEligibility(detail);
+      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');
+      qs('#pull-merge-state').textContent = eligibility.reason;
+      qs('#merge-pull').disabled = !eligibility.allowed;
+      qs('#pull-files').innerHTML = (detail.files || []).length ? detail.files.map(file =>
+        '<div class="pull-file"><strong>' + escapeHtml(file.filename) + '</strong><div class="small">' +
+        escapeHtml(file.status || 'changed') + ' · +' + Number(file.additions || 0) + ' / −' + Number(file.deletions || 0) + '</div></div>'
+      ).join('') : '<div class="muted">No changed files reported.</div>';
+      qs('#pull-comments').innerHTML = (detail.comments || []).length ? detail.comments.map(comment =>
+        '<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) {
+      if (selectedPull !== item) return;
+      qs('#pull-sheet-status').textContent = error.message + ' Retry here or open it in Gitea.';
+      qs('#retry-pull-load').hidden = false;
+      qs('#retry-pull-load').focus();
+    }
+  }
+
+  function closePullSheet() {
+    qs('#pull-sheet').classList.remove('open');
+    selectedPull = null;
+    selectedPullDetail = null;
+    if (pullTrigger?.isConnected) pullTrigger.focus();
+  }
+
   function saveIssueCaptureDraft() {
     issueCapture.saveDraft({
       repository: qs('#create-issue-repository').value,
@@ -1134,6 +1236,11 @@ textarea { resize: vertical; min-height: 120px; }
       closeIssueSheet();
       return;
     }
+    if (e.key === 'Escape' && selectedPull) {
+      e.preventDefault();
+      closePullSheet();
+      return;
+    }
     if ((e.metaKey||e.ctrlKey) && e.key==='k') {
       e.preventDefault();
       qs('#cmd-palette').classList.toggle('open');
@@ -1236,6 +1343,57 @@ textarea { resize: vertical; min-height: 120px; }
       button.focus();
     }
   });
+  qs('#close-pull-sheet').addEventListener('click', closePullSheet);
+  qs('#retry-pull-load').addEventListener('click', () => {
+    if (selectedPull) openPullSheet(selectedPull, pullTrigger);
+  });
+  qs('#pull-comment').addEventListener('input', event => {
+    if (selectedPull) pullController.saveDraft(selectedPull, event.target.value);
+  });
+  qs('#send-pull-comment').addEventListener('click', async () => {
+    if (!selectedPull) return;
+    const body = qs('#pull-comment').value.trim();
+    if (!body) {
+      qs('#pull-comment-status').textContent = 'Write a comment before posting.';
+      qs('#pull-comment').focus();
+      return;
+    }
+    const button = qs('#send-pull-comment');
+    button.disabled = true;
+    qs('#pull-comment-status').textContent = 'Posting comment…';
+    try {
+      const comment = await pullController.comment(selectedPull, body);
+      qs('#pull-comments .muted')?.remove();
+      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) {
+      qs('#pull-comment-status').textContent = error.message + ' Your draft is safe; retry.';
+      qs('#pull-comment').focus();
+    } finally {
+      button.disabled = false;
+    }
+  });
+  qs('#merge-pull').addEventListener('click', async () => {
+    if (!selectedPull || !selectedPullDetail?.head_sha || !window.confirm('Merge ' + selectedPull.key + ' at current head?')) return;
+    const merging = selectedPull;
+    const button = qs('#merge-pull');
+    button.disabled = true;
+    qs('#pull-sheet-status').textContent = 'Merging pull request…';
+    try {
+      await pullController.merge(selectedPull, selectedPullDetail.head_sha);
+      lastMyWork = lastMyWork.filter(item =>
+        !(item.kind === 'pull' && item.repository === merging.repository && item.number === merging.number)
+      );
+      closePullSheet();
+      refreshMyWorkView();
+      qs('#my-work-action-status').textContent = merging.key + ' merged.';
+    } catch (error) {
+      qs('#pull-sheet-status').textContent = error.message + ' The pull request remains in My Work; refresh and retry.';
+      button.disabled = false;
+      button.focus();
+    }
+  });
   qs('#keep-update-unread').addEventListener('click', () => closeUpdateSheet(true));
   qs('#retry-update-load').addEventListener('click', () => {
     if (selectedUpdate) notificationReader.open(selectedUpdate, lastMyWork);
diff --git a/frontend/pull-sheet.js b/frontend/pull-sheet.js
new file mode 100644
index 0000000..8047b47
--- /dev/null
+++ b/frontend/pull-sheet.js
@@ -0,0 +1,63 @@
+function mergeEligibility(detail) {
+  if (!detail || detail.state !== 'open' || detail.merged) {
+    return { allowed: false, reason: 'Pull request is not open' };
+  }
+  if (detail.draft) return { allowed: false, reason: 'Draft pull requests cannot be merged' };
+  if (!detail.mergeable) return { allowed: false, reason: 'Resolve conflicts before merging' };
+  if (detail.ci_state !== 'success') {
+    return { allowed: false, reason: 'CI must succeed before merging' };
+  }
+  if (!detail.head_sha) return { allowed: false, reason: 'Current head is unavailable' };
+  return { allowed: true, reason: 'Ready to merge' };
+}
+
+function createPullSheet({ fetchJson, storage }) {
+  let commentRequest = null;
+  let mergeRequest = null;
+  const pathFor = item => 'api/v1/repos/' + String(item.repository || '').split('/')
+    .map(encodeURIComponent).join('/') + '/pulls/' + encodeURIComponent(item.number);
+  const draftKey = item => 'stackchain.pull-comment.v1:' + item.repository + '#' + item.number;
+
+  return {
+    load(item) {
+      return fetchJson(pathFor(item) + '/detail', { headers: { Accept: 'application/json' } });
+    },
+    loadDraft(item) {
+      try { return storage?.getItem(draftKey(item)) || ''; }
+      catch (_error) { return ''; }
+    },
+    saveDraft(item, body) {
+      try { storage?.setItem(draftKey(item), body); }
+      catch (_error) { /* The textarea remains the fallback. */ }
+    },
+    comment(item, body) {
+      if (commentRequest) return commentRequest;
+      this.saveDraft(item, body);
+      commentRequest = fetchJson(pathFor(item) + '/comments', {
+        method: 'POST',
+        headers: { Accept: 'application/json', 'Content-Type': 'application/json' },
+        body: JSON.stringify({ body }),
+      }).then(result => {
+        try { storage?.removeItem(draftKey(item)); }
+        catch (_error) { /* The upstream comment is authoritative. */ }
+        return result;
+      }).finally(() => { commentRequest = null; });
+      return commentRequest;
+    },
+    merge(item, expectedHeadSha) {
+      if (mergeRequest) return mergeRequest;
+      mergeRequest = fetchJson(pathFor(item) + '/merge', {
+        method: 'POST',
+        headers: { Accept: 'application/json', 'Content-Type': 'application/json' },
+        body: JSON.stringify({ expected_head_sha: expectedHeadSha }),
+      }).then(result => {
+        if (!result?.merged) throw new Error('Pull request merge was not confirmed.');
+        return result;
+      }).finally(() => { mergeRequest = null; });
+      return mergeRequest;
+    },
+  };
+}
+
+createPullSheet.mergeEligibility = mergeEligibility;
+if (typeof module !== 'undefined' && module.exports) module.exports = createPullSheet;
diff --git a/src/gitea_proxy.py b/src/gitea_proxy.py
index 5372179..9ea8a83 100644
--- a/src/gitea_proxy.py
+++ b/src/gitea_proxy.py
@@ -18,6 +18,14 @@ class StaleReviewError(ValueError):
     """Raised before mutation when a pull request head changed during review."""
 
 
+class StalePullError(ValueError):
+    """Raised before merge when an assigned pull request head changed."""
+
+
+class PullNotMergeableError(ValueError):
+    """Raised before merge when current pull state or checks prohibit it."""
+
+
 def _auth() -> dict[str, str]:
     headers: dict[str, str] = {"Accept": "application/json"}
     if GITEA_TOKEN:
@@ -482,6 +490,94 @@ async def is_requested_review(repository: str, number: int) -> bool:
     )
 
 
+async def is_assigned_pull(repository: str, number: int) -> bool:
+    pulls = await fetch(
+        "repos/issues/search?state=open&assigned=true&type=pulls&limit=50"
+    )
+    return any(
+        isinstance(pull, dict)
+        and pull.get("number") == number
+        and isinstance(pull.get("repository"), dict)
+        and pull["repository"].get("full_name") == repository
+        for pull in (pulls or [])
+    )
+
+
+async def pull_completion_detail(repository: str, number: int) -> dict:
+    base = f"repos/{repository}/pulls/{number}"
+    pull = await fetch(base)
+    if not isinstance(pull, 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 = 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"),
+    )
+    user = pull.get("user") if isinstance(pull.get("user"), dict) else {}
+    return {
+        "repository": repository,
+        "number": number,
+        "title": pull.get("title") if isinstance(pull.get("title"), str) else "",
+        "body": pull.get("body") if isinstance(pull.get("body"), str) else "",
+        "url": _safe_web_url(pull.get("html_url")),
+        "author": user.get("login") if isinstance(user.get("login"), str) else "",
+        "head_sha": sha,
+        "state": pull.get("state") if isinstance(pull.get("state"), str) else "",
+        "draft": pull.get("draft") is True,
+        "mergeable": pull.get("mergeable") is True,
+        "merged": pull.get("merged") is True,
+        "ci_state": status.get("state", "unknown") if isinstance(status, dict) else "unknown",
+        "files": [
+            {
+                "filename": item.get("filename", ""),
+                "status": item.get("status") or "changed",
+                "additions": item.get("additions") or 0,
+                "deletions": item.get("deletions") or 0,
+            }
+            for item in (files if isinstance(files, list) else [])[:100]
+            if isinstance(item, dict) and isinstance(item.get("filename"), str)
+        ],
+        "comments": [
+            _normalize_issue_comment(item)
+            for item in (comments if isinstance(comments, list) else [])[:20]
+            if isinstance(item, dict)
+        ],
+    }
+
+
+async def merge_assigned_pull(
+    repository: str, number: int, expected_head_sha: str
+) -> dict:
+    base = f"repos/{repository}/pulls/{number}"
+    pull = await fetch(base)
+    if not isinstance(pull, dict):
+        raise PullNotMergeableError("Pull request state is unavailable")
+    head_value = pull.get("head")
+    head: dict = head_value if isinstance(head_value, dict) else {}
+    current_sha = head.get("sha")
+    if current_sha != expected_head_sha:
+        raise StalePullError("Pull request changed before merge")
+    status = await fetch(f"repos/{repository}/commits/{current_sha}/status")
+    ci_state = status.get("state") if isinstance(status, dict) else "unknown"
+    if (
+        pull.get("state") != "open"
+        or pull.get("draft") is True
+        or pull.get("mergeable") is not True
+        or pull.get("merged") is True
+        or ci_state != "success"
+    ):
+        raise PullNotMergeableError("Pull request is not currently safe to merge")
+    response = await _get_client().post(
+        f"/api/v1/{base}/merge",
+        headers=_auth(),
+        json={"Do": "merge", "head_commit_id": current_sha},
+    )
+    response.raise_for_status()
+    return {"number": number, "merged": True, "state": "closed"}
+
+
 async def pull_review_detail(repository: str, number: int) -> dict:
     base = f"repos/{repository}/pulls/{number}"
     pull = await fetch(base)
diff --git a/src/main.py b/src/main.py
index 4ed682f..0da7b4c 100644
--- a/src/main.py
+++ b/src/main.py
@@ -137,6 +137,10 @@ class PullReviewSubmission(BaseModel):
         return value
 
 
+class PullMergeSubmission(BaseModel):
+    expected_head_sha: str = Field(min_length=1, max_length=128)
+
+
 def _context_payload(user_data, repo_data, issues_data, prs_data) -> dict:
     user_model = User(
         id=user_data["id"],
@@ -194,7 +198,7 @@ async def prevent_live_api_caching(request, call_next):
         and request.url.path.endswith("/review")
     ) or request.url.path.startswith("/api/v1/notifications") or (
         request.url.path.startswith("/api/v1/repos/")
-        and "/issues/" in request.url.path
+        and ("/issues/" in request.url.path or "/pulls/" in request.url.path)
     ) or (
         request.url.path.startswith("/api/v1/repos/")
         and request.url.path.endswith("/issues")
@@ -839,6 +843,101 @@ async def review_detail(owner: str, repo: str, number: int):
         )
 
 
+@app.get("/api/v1/repos/{owner}/{repo}/pulls/{number}/detail")
+async def assigned_pull_detail(owner: str, repo: str, number: int = PathParam(gt=0)):
+    repository = f"{owner}/{repo}"
+
+    async def load_assigned_pull():
+        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.pull_completion_detail(repository, number)
+
+    try:
+        return await asyncio.wait_for(
+            load_assigned_pull(), timeout=REVIEW_DETAIL_TIMEOUT_SECONDS
+        )
+    except HTTPException:
+        raise
+    except TimeoutError:
+        return JSONResponse(
+            {"error": "Loading the pull request timed out. Please retry."},
+            status_code=503,
+            headers={"Retry-After": "1"},
+        )
+    except Exception:
+        return JSONResponse(
+            {"error": "The pull request is temporarily unavailable. 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, owner: str, repo: str, number: int = PathParam(gt=0)
+):
+    repository = f"{owner}/{repo}"
+
+    async def post_comment():
+        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.comment_on_issue(repository, number, comment.body)
+
+    try:
+        result = await asyncio.wait_for(
+            post_comment(), timeout=ISSUE_ACTION_TIMEOUT_SECONDS
+        )
+    except HTTPException:
+        raise
+    except Exception:
+        return JSONResponse(
+            {"error": "The comment could not be posted. Your draft is safe; please retry."},
+            status_code=503,
+            headers={"Retry-After": "1"},
+        )
+    return JSONResponse(result, status_code=201)
+
+
+@app.post("/api/v1/repos/{owner}/{repo}/pulls/{number}/merge")
+async def merge_assigned_pull(
+    submission: PullMergeSubmission,
+    owner: str,
+    repo: str,
+    number: int = PathParam(gt=0),
+):
+    repository = f"{owner}/{repo}"
+
+    async def merge_pull():
+        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.merge_assigned_pull(
+            repository, number, submission.expected_head_sha
+        )
+
+    try:
+        return await asyncio.wait_for(
+            merge_pull(), timeout=ISSUE_ACTION_TIMEOUT_SECONDS
+        )
+    except HTTPException:
+        raise
+    except gitea_proxy.StalePullError:
+        return JSONResponse(
+            {"error": "New commits were pushed. Refresh before merging."},
+            status_code=409,
+        )
+    except gitea_proxy.PullNotMergeableError:
+        return JSONResponse(
+            {"error": "This pull request is not currently safe to merge. Refresh its status."},
+            status_code=409,
+        )
+    except Exception:
+        return JSONResponse(
+            {"error": "The pull request could not be merged. It remains in My Work; please retry."},
+            status_code=503,
+            headers={"Retry-After": "1"},
+        )
+
+
 @app.post("/api/v1/repos/{owner}/{repo}/pulls/{number}/review", status_code=201)
 async def submit_review(
     submission: PullReviewSubmission, owner: str, repo: str, number: int
diff --git a/tests/test_my_work.py b/tests/test_my_work.py
index 91d348b..979a556 100644
--- a/tests/test_my_work.py
+++ b/tests/test_my_work.py
@@ -11,6 +11,7 @@ MY_WORK = Path(__file__).parents[1] / "frontend" / "my-work.js"
 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"
 
 
 def test_my_work_queue_prioritizes_labels_then_reviews_and_keeps_repo_identity():
@@ -691,6 +692,80 @@ Promise.all([first, duplicate]).then(results =>
     }
 
 
+def test_pull_sheet_preserves_comment_draft_and_single_flights_mutations():
+    script = f"""
+const createPullSheet = require({json.dumps(str(PULL_SHEET))});
+const values = new Map();
+const storage = {{getItem:k => values.get(k) || null, setItem:(k,v) => values.set(k,v), removeItem:k => values.delete(k)}};
+const calls = [];
+let releaseComment;
+const controller = createPullSheet({{
+  storage,
+  fetchJson: (url, options={{}}) => {{
+    calls.push({{url, method:options.method || 'GET', body:options.body ? JSON.parse(options.body) : null}});
+    if (url.endsWith('/comments')) return new Promise(resolve => {{ releaseComment = () => resolve({{id:91, body:'Ship it'}}); }});
+    return Promise.resolve({{number:7, merged:true, state:'closed'}});
+  }},
+}});
+const item = {{repository:'stackchain/api', number:7}};
+controller.saveDraft(item, 'Ship it');
+const first = controller.comment(item, 'Ship it');
+const duplicate = controller.comment(item, 'Ship it');
+const during = controller.loadDraft(item);
+releaseComment();
+Promise.all([first, duplicate]).then(async comments => {{
+  const merges = await Promise.all([controller.merge(item, 'abc123'), controller.merge(item, 'abc123')]);
+  process.stdout.write(JSON.stringify({{calls, during, after:controller.loadDraft(item), comments, merges}}));
+}});
+"""
+    result = subprocess.run(["node", "-e", script], check=True, capture_output=True, text=True)
+    output = json.loads(result.stdout)
+
+    assert output["during"] == "Ship it"
+    assert output["after"] == ""
+    assert output["calls"] == [
+        {"url": "api/v1/repos/stackchain/api/pulls/7/comments", "method": "POST", "body": {"body": "Ship it"}},
+        {"url": "api/v1/repos/stackchain/api/pulls/7/merge", "method": "POST", "body": {"expected_head_sha": "abc123"}},
+    ]
+    assert len(output["comments"]) == 2 and len(output["merges"]) == 2
+
+
+def test_pull_sheet_enables_merge_only_for_current_safe_state():
+    script = f"""
+const createPullSheet = require({json.dumps(str(PULL_SHEET))});
+const states = [
+  {{state:'open', draft:false, mergeable:true, merged:false, ci_state:'success', head_sha:'abc'}},
+  {{state:'open', draft:true, mergeable:true, merged:false, ci_state:'success', head_sha:'abc'}},
+  {{state:'open', draft:false, mergeable:true, merged:false, ci_state:'failure', head_sha:'abc'}},
+  {{state:'open', draft:false, mergeable:false, merged:false, ci_state:'success', head_sha:'abc'}},
+];
+process.stdout.write(JSON.stringify(states.map(createPullSheet.mergeEligibility)));
+"""
+    result = subprocess.run(["node", "-e", script], check=True, capture_output=True, text=True)
+    output = json.loads(result.stdout)
+    assert output[0] == {"allowed": True, "reason": "Ready to merge"}
+    assert output[1]["allowed"] is False and "draft" in output[1]["reason"].lower()
+    assert output[2]["allowed"] is False and "CI" in output[2]["reason"]
+    assert output[3]["allowed"] is False and "conflict" in output[3]["reason"].lower()
+
+
+@pytest.mark.anyio
+async def test_assigned_pulls_open_accessible_mobile_completion_sheet():
+    html = await dashboard()
+
+    assert 'id="pull-sheet"' in html and 'aria-modal="true"' in html
+    assert 'class="my-work-card-main pull-trigger"' in html
+    assert 'id="pull-sheet-status"' in html
+    assert 'id="pull-files"' in html and 'id="pull-comments"' 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
+    assert "pullController.load(item)" in html
+    assert "window.confirm('Merge ' + selectedPull.key" in html
+    assert "expected_head_sha" in html
+    assert "item.kind === 'pull'" in html and "pull-trigger" in html
+
+
 @pytest.mark.anyio
 async def test_assigned_issues_open_accessible_mobile_action_sheet_with_safe_mutations():
     html = await dashboard()
diff --git a/tests/test_pull_api.py b/tests/test_pull_api.py
new file mode 100644
index 0000000..cb7a1dd
--- /dev/null
+++ b/tests/test_pull_api.py
@@ -0,0 +1,149 @@
+import httpx
+import pytest
+
+from src import gitea_proxy, main
+
+
+@pytest.mark.anyio
+async def test_assigned_pull_detail_reports_completion_state(monkeypatch):
+    async def assigned(repository, number):
+        return (repository, number) == ("stackchain/api", 7)
+
+    async def detail(repository, number):
+        assert (repository, number) == ("stackchain/api", 7)
+        return {
+            "repository": repository,
+            "number": number,
+            "title": "Ship mobile flow",
+            "body": "Ready to merge",
+            "url": "https://forge.example/stackchain/api/pulls/7",
+            "author": "alex",
+            "head_sha": "abc123",
+            "state": "open",
+            "draft": False,
+            "mergeable": True,
+            "merged": False,
+            "ci_state": "success",
+            "files": [{"filename": "src/api.py", "additions": 8, "deletions": 2}],
+            "comments": [{"id": 9, "author": "sam", "body": "Ship it"}],
+        }
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_pull", assigned, raising=False)
+    monkeypatch.setattr(main.gitea_proxy, "pull_completion_detail", detail, raising=False)
+    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/detail")
+
+    assert response.status_code == 200
+    assert response.headers["cache-control"] == "no-store"
+    assert response.json()["head_sha"] == "abc123"
+    assert response.json()["mergeable"] is True
+
+
+@pytest.mark.anyio
+async def test_assigned_pull_detail_rejects_unassigned_pull(monkeypatch):
+    async def assigned(repository, number):
+        return False
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_pull", assigned, raising=False)
+    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/private/secret/pulls/9/detail")
+
+    assert response.status_code == 404
+
+
+@pytest.mark.anyio
+async def test_assigned_pull_comment_posts_only_after_assignment_check(monkeypatch):
+    calls = []
+
+    async def assigned(repository, number):
+        return True
+
+    async def comment(repository, number, body):
+        calls.append((repository, number, body))
+        return {"id": 91, "author": "timmy", "body": body}
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_pull", assigned)
+    monkeypatch.setattr(main.gitea_proxy, "comment_on_issue", comment)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.post(
+            "/api/v1/repos/stackchain/api/pulls/7/comments",
+            json={"body": "  Ready to ship.  "},
+        )
+
+    assert response.status_code == 201
+    assert calls == [("stackchain/api", 7, "Ready to ship.")]
+
+
+@pytest.mark.anyio
+async def test_assigned_pull_merge_requires_current_eligible_head(monkeypatch):
+    calls = []
+
+    async def assigned(repository, number):
+        return True
+
+    async def merge(repository, number, expected_head_sha):
+        calls.append((repository, number, expected_head_sha))
+        return {"number": number, "merged": True, "state": "closed"}
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_pull", assigned)
+    monkeypatch.setattr(main.gitea_proxy, "merge_assigned_pull", merge, raising=False)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.post(
+            "/api/v1/repos/stackchain/api/pulls/7/merge",
+            json={"expected_head_sha": "abc123"},
+        )
+
+    assert response.status_code == 200
+    assert response.json() == {"number": 7, "merged": True, "state": "closed"}
+    assert calls == [("stackchain/api", 7, "abc123")]
+
+
+@pytest.mark.anyio
+async def test_assigned_pull_merge_returns_conflict_without_mutating_stale_head(monkeypatch):
+    async def assigned(repository, number):
+        return True
+
+    async def merge(*args):
+        raise gitea_proxy.StalePullError("changed")
+
+    monkeypatch.setattr(main.gitea_proxy, "is_assigned_pull", assigned)
+    monkeypatch.setattr(main.gitea_proxy, "merge_assigned_pull", merge, raising=False)
+    transport = httpx.ASGITransport(app=main.app)
+    async with httpx.AsyncClient(transport=transport, base_url="http://test") as client:
+        response = await client.post(
+            "/api/v1/repos/stackchain/api/pulls/7/merge",
+            json={"expected_head_sha": "abc123"},
+        )
+
+    assert response.status_code == 409
+    assert "New commits" in response.json()["error"]
+
+
+@pytest.mark.anyio
+async def test_gitea_merge_rejects_failed_ci_without_upstream_mutation():
+    requests = []
+
+    async def handler(request):
+        requests.append((request.method, request.url.path))
+        if request.url.path.endswith("/pulls/7"):
+            return httpx.Response(200, json={
+                "number": 7, "state": "open", "draft": False, "mergeable": True,
+                "merged": False, "head": {"sha": "abc123"},
+            })
+        return httpx.Response(200, json={"state": "failure"})
+
+    gitea_proxy.start_client(transport=httpx.MockTransport(handler))
+    try:
+        with pytest.raises(gitea_proxy.PullNotMergeableError):
+            await gitea_proxy.merge_assigned_pull("stackchain/api", 7, "abc123")
+    finally:
+        await gitea_proxy.stop_client()
+
+    assert requests == [
+        ("GET", "/api/v1/repos/stackchain/api/pulls/7"),
+        ("GET", "/api/v1/repos/stackchain/api/commits/abc123/status"),
+    ]