diff --git a/internal/web/server_test.go b/internal/web/server_test.go
index 662fd196..b367aaf8 100644
--- a/internal/web/server_test.go
+++ b/internal/web/server_test.go
@@ -1730,13 +1730,19 @@ func TestHandlerIndexServesHTML(t *testing.T) {
 	if !strings.Contains(markup, `id="chat-repo-tabs"`) ||
 		!strings.Contains(markup, `function chatPromptedRepoTabs()`) ||
 		!strings.Contains(markup, `state.snapshot.prompted_repos`) ||
+		!strings.Contains(markup, `chatClosedRepoKeys: loadChatClosedRepoKeys(),`) ||
+		!strings.Contains(markup, `function canCloseChatProject(repoKey)`) ||
+		!strings.Contains(markup, `const canCloseProject = canCloseChatProject(repoKey);`) ||
+		!strings.Contains(markup, `closeButton.className = "chat-repo-card-close";`) ||
+		!strings.Contains(markup, `if (state.chatClosedRepoKeys.has(key) && !activeKeys.has(key)) continue;`) ||
+		!strings.Contains(markup, `state.chatClosedRepoKeys.delete(chatRepoKey(repoValue));`) ||
 		!strings.Contains(markup, `reposIcon.innerHTML = `+"`"+`<i data-lucide="brick-wall" aria-hidden="true"></i>`+"`"+`;`) ||
 		!strings.Contains(markup, `reposLabel.textContent = "All repositories";`) ||
 		!strings.Contains(markup, `function selectedChatRepo(repos, selectedTab)`) ||
 		!strings.Contains(markup, `chatRepoGrid.classList.toggle("chat-repo-grid-active-repo", Boolean(openRepo));`) ||
 		!strings.Contains(markup, `const viewingRepoChat = Boolean(selectedTab && openRepo);`) ||
 		!strings.Contains(markup, `displayRepos = [openRepo];`) {
-		t.Fatalf("expected index html chat to render prompted repository tabs, icon-only repos tab, and isolate active repository chat")
+		t.Fatalf("expected index html chat to render closable prompted repository tabs, icon-only repos tab, and isolate active repository chat")
 	}
 	if !strings.Contains(markup, `if (viewingRepoChat) {
         chatStatus.textContent = "";`) {
@@ -2902,6 +2908,11 @@ func TestHandlerServesStaticCSS(t *testing.T) {
 	if !strings.Contains(css, ".chat-repo-card[aria-expanded=\"true\"] {\n  grid-column: 1 / -1;") {
 		t.Fatalf("expected expanded chat repository cards to span the full repository grid width")
 	}
+	if !strings.Contains(css, ".chat-repo-card-actions") ||
+		!strings.Contains(css, ".chat-repo-card-close") ||
+		!strings.Contains(css, ".chat-repo-card-closable .chat-repo-card-head") {
+		t.Fatalf("expected stylesheet to place active chat project close button beside the chat icon")
+	}
 	if !strings.Contains(css, ".chat-shell {\n  display: flex;\n  flex-direction: column;") ||
 		!strings.Contains(css, ".chat-repo-grid-active-repo {\n  flex: 1 1 auto;") ||
 		!strings.Contains(css, ".chat-repo-grid-active-repo .chat-repo-card[aria-expanded=\"true\"] {") ||
diff --git a/internal/web/static/index.html b/internal/web/static/index.html
index 33f50cc0..26bebab5 100644
--- a/internal/web/static/index.html
+++ b/internal/web/static/index.html
@@ -685,6 +685,7 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
     const TASK_HISTORY_KEY = "hubui.taskHistory.v1";
     const TASK_HISTORY_UNSEEN_KEY = "hubui.taskHistoryUnseen.v1";
     const TASK_SOUND_MUTED_KEY = "hubui.taskSoundMuted";
+    const CHAT_CLOSED_REPOS_KEY = "hubui.chatClosedRepoKeys.v1";
     const THEME_KEY = "hubui.theme";
     const HOVER_MODE_KEY = "hubui.hoverMode";
     const THEME_MODES = ["light", "dark", "night", "pink"];
@@ -1662,6 +1663,20 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
       }
     }
 
+    function loadChatClosedRepoKeys() {
+      try {
+        const raw = localStorage.getItem(CHAT_CLOSED_REPOS_KEY);
+        if (!raw) return new Set();
+        const parsed = JSON.parse(raw);
+        if (!Array.isArray(parsed)) return new Set();
+        return new Set(parsed
+          .map((key) => String(key || "").trim().toLowerCase())
+          .filter(Boolean));
+      } catch (_err) {
+        return new Set();
+      }
+    }
+
     function loadTaskSoundMuted() {
       try {
         return localStorage.getItem(TASK_SOUND_MUTED_KEY) === "true";
@@ -1740,6 +1755,7 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
       chatPromptDrafts: new Map(),
       chatOpenRepoKey: "",
       chatPromptedRepos: [],
+      chatClosedRepoKeys: loadChatClosedRepoKeys(),
       chatRepoActivityKeys: new Set(),
       chatRepoActivityTones: new Map(),
       chatActiveRepoTab: "repos",
@@ -5318,6 +5334,14 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
       }
     }
 
+    function persistChatClosedRepoKeys() {
+      try {
+        localStorage.setItem(CHAT_CLOSED_REPOS_KEY, JSON.stringify(Array.from(state.chatClosedRepoKeys)));
+      } catch (_err) {
+        // Ignore localStorage failures.
+      }
+    }
+
     function rememberRepos(repos) {
       const unique = dedupeRepoValues([...(repos || []), ...state.repoHistory]);
       if (unique.length === state.repoHistory.length && unique.every((value, index) => value === state.repoHistory[index])) {
@@ -5984,14 +6008,56 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
       return Boolean(control && control !== card);
     }
 
+    function activeChatRepoKeys() {
+      const keys = new Set();
+      for (const task of state.snapshot?.tasks || []) {
+        if (isCompletedTask(task)) continue;
+        for (const key of chatRepoKeysForTask(task)) {
+          keys.add(key);
+        }
+      }
+      return keys;
+    }
+
+    function chatRepoHasActiveWork(repoKey) {
+      const key = String(repoKey || "").trim();
+      return Boolean(key && activeChatRepoKeys().has(key));
+    }
+
+    function canCloseChatProject(repoKey) {
+      const key = String(repoKey || "").trim();
+      return Boolean(key && state.chatActiveRepoTab === key && !chatRepoHasActiveWork(key));
+    }
+
+    function closeChatProject(repoKey) {
+      const key = String(repoKey || "").trim();
+      if (!key || chatRepoHasActiveWork(key)) return false;
+      state.chatClosedRepoKeys.add(key);
+      persistChatClosedRepoKeys();
+      state.chatPromptedRepos = state.chatPromptedRepos.filter((repo) => chatRepoKey(repo) !== key);
+      clearChatRepoActivity(key);
+      if (state.chatActiveRepoTab === key) {
+        state.chatActiveRepoTab = "repos";
+      }
+      if (state.chatOpenRepoKey === key) {
+        state.chatOpenRepoKey = "";
+      }
+      state.chatRepoPage = 1;
+      renderChatRepos();
+      trackAnalyticsEvent("chat_project_closed", { source: "chat" });
+      return true;
+    }
+
     function renderChatRepoCard(repo) {
       const repoKey = chatRepoKey(chatRepoRunValue(repo));
       const expanded = Boolean(repoKey && state.chatOpenRepoKey === repoKey);
+      const canCloseProject = canCloseChatProject(repoKey);
       const visibility = repo?.private ? "Private" : "Public";
       const repoTitle = String(repo?.full_name || repo?.name || "Unnamed repository");
       const repoDescription = String(repo?.description || "No description.");
       const card = document.createElement("div");
       card.className = "chat-repo-card";
+      card.classList.toggle("chat-repo-card-closable", canCloseProject);
       card.tabIndex = 0;
       card.setAttribute("role", "button");
       card.dataset.repoKey = repoKey;
@@ -6016,12 +6082,30 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
       }
       head.appendChild(title);
 
+      const actions = document.createElement("span");
+      actions.className = "chat-repo-card-actions";
+      if (canCloseProject) {
+        const closeButton = document.createElement("button");
+        closeButton.className = "chat-repo-card-close";
+        closeButton.type = "button";
+        closeButton.title = "Close project";
+        closeButton.setAttribute("aria-label", `Close ${repoTitle} project`);
+        closeButton.innerHTML = `<i data-lucide="x" aria-hidden="true"></i>`;
+        closeButton.addEventListener("click", (event) => {
+          event.preventDefault();
+          event.stopPropagation();
+          closeChatProject(repoKey);
+        });
+        actions.appendChild(closeButton);
+      }
+
       const chatIcon = document.createElement("span");
       chatIcon.className = "chat-repo-card-chat-icon";
       chatIcon.title = "Prompt";
       chatIcon.setAttribute("aria-hidden", "true");
       chatIcon.innerHTML = `<i data-lucide="message-circle" aria-hidden="true"></i>`;
-      head.appendChild(chatIcon);
+      actions.appendChild(chatIcon);
+      head.appendChild(actions);
       card.appendChild(head);
 
       const description = document.createElement("span");
@@ -6793,11 +6877,13 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
       }
       repos.push(...state.chatPromptedRepos);
 
+      const activeKeys = activeChatRepoKeys();
       const seen = new Set();
       const out = [];
       for (const repo of repos) {
         const key = chatRepoKey(repo);
         if (!key || seen.has(key)) continue;
+        if (state.chatClosedRepoKeys.has(key) && !activeKeys.has(key)) continue;
         seen.add(key);
         out.push({ key, value: repo, label: chatRepoTabLabel(repo) });
       }
@@ -7171,6 +7257,8 @@ <h2 id="hub-setup-title">Connect to Hub</h2>
           source: "chat",
           sourceLabel: "Chat",
         });
+        state.chatClosedRepoKeys.delete(chatRepoKey(repoValue));
+        persistChatClosedRepoKeys();
         state.chatPromptedRepos = dedupeRepoValues([repoValue, ...state.chatPromptedRepos]);
         state.chatActiveRepoTab = chatRepoKey(repoValue) || state.chatActiveRepoTab;
         state.chatRepoPage = 1;
diff --git a/internal/web/static/style.css b/internal/web/static/style.css
index 04714dc4..38cc5dfb 100644
--- a/internal/web/static/style.css
+++ b/internal/web/static/style.css
@@ -1577,6 +1577,7 @@ html.pink .hub-dock-group[data-configured="true"] #moltenbot-hub-link:focus-visi
 .task-sound-toggle:focus-visible,
 .task-history-toggle:focus-visible,
 .task-close:focus-visible,
+.chat-repo-card-close:focus-visible,
 .task-rerun:focus-visible,
 .task-control-toggle:focus-visible,
 .task-stop:focus-visible,
@@ -3106,6 +3107,10 @@ select.prompt-control {
   padding-right: 34px;
 }
 
+.chat-repo-card-closable .chat-repo-card-head {
+  padding-right: 70px;
+}
+
 .chat-repo-card-owner-icon {
   flex: 0 0 auto;
   display: inline-grid;
@@ -3132,10 +3137,17 @@ select.prompt-control {
   line-height: 1.25;
 }
 
-.chat-repo-card-chat-icon {
+.chat-repo-card-actions {
   position: absolute;
   top: 10px;
   right: 10px;
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.chat-repo-card-chat-icon,
+.chat-repo-card-close {
   display: inline-grid;
   place-items: center;
   width: 28px;
@@ -3147,7 +3159,19 @@ select.prompt-control {
   box-shadow: var(--surface-button-shadow);
 }
 
-.chat-repo-card-chat-icon svg {
+.chat-repo-card-close {
+  color: var(--text-soft);
+}
+
+.chat-repo-card-close:hover,
+.chat-repo-card-close:focus-visible {
+  border-color: color-mix(in srgb, var(--surface-danger) 36%, var(--border));
+  background: color-mix(in srgb, var(--surface-danger) 10%, var(--surface-button-bg));
+  color: color-mix(in srgb, var(--surface-danger) 72%, var(--text-soft));
+}
+
+.chat-repo-card-chat-icon svg,
+.chat-repo-card-close svg {
   width: 15px;
   height: 15px;
   stroke-width: 2.25;
@@ -6516,6 +6540,7 @@ html[data-hover-mode="on"] .task-view-toggle:not(:disabled),
 html[data-hover-mode="on"] .task-fullscreen-toggle:not(:disabled),
 html[data-hover-mode="on"] .prompt-visibility-toggle:not(:disabled),
 html[data-hover-mode="on"] .task-close:not(:disabled),
+html[data-hover-mode="on"] .chat-repo-card-close:not(:disabled),
 html[data-hover-mode="on"] .task-control-toggle:not(:disabled),
 html[data-hover-mode="on"] .task-stop:not(:disabled),
 html[data-hover-mode="on"] .task:not(.task-closing) {
@@ -6552,6 +6577,7 @@ html[data-hover-mode="on"] .task-fullscreen-toggle:not(:disabled) {
 
 html[data-hover-mode="off"] .task,
 html[data-hover-mode="off"] .task-close,
+html[data-hover-mode="off"] .chat-repo-card-close,
 html[data-hover-mode="off"] .task-control-toggle,
 html[data-hover-mode="off"] .task-stop,
 html[data-hover-mode="off"] .prompt-action-button,
@@ -6568,6 +6594,7 @@ html[data-hover-mode="off"] .prompt-visibility-toggle {
 
 html[data-hover-mode="off"] .task:hover,
 html[data-hover-mode="off"] .task-close:hover,
+html[data-hover-mode="off"] .chat-repo-card-close:hover,
 html[data-hover-mode="off"] .task-control-toggle:hover,
 html[data-hover-mode="off"] .task-stop:hover,
 html[data-hover-mode="off"] .prompt-action-button:hover,