show reasoning in frontend and some other stuff

README.md

@@ -33,9 +33,13 @@ Node.js 22 or newer is required.
 - `CHAT_LIMIT`: per-account maximum chat sessions.
 - `CHAT_HISTORY_LIMIT`: number of recent messages included in model prompts.
 - `MODEL_API_BASE_URL`: base URL of the remote model backend. The server expects `/chat` and `/tags`.
-- `MODEL_REQUEST_TIMEOUT_MS`: timeout for chat generation requests.
+- `MODEL_REQUEST_TIMEOUT_MS`: legacy fallback for the inactivity timeout (default 180000 ms).
+- `MODEL_CONNECT_TIMEOUT_MS`: time to receive Ollama response headers (default 30000 ms).
+- `MODEL_INACTIVITY_TIMEOUT_MS`: maximum silence between received stream chunks (default 180000 ms).
+- `MODEL_MAX_GENERATION_MS`: overall generation safety limit (default 600000 ms).
+- `OLLAMA_KEEP_ALIVE`: Ollama model residency after a request (default `30m`).
 - `MODEL_LIST_TIMEOUT_MS`: timeout for model list requests.
-- `MODEL_UNLOAD_AFTER_MS`: delay before an idle model unload is attempted.
+- `MODEL_UNLOAD_AFTER_MS`: delay before idle local request bookkeeping is cleared. Model unloading is managed by Ollama through `OLLAMA_KEEP_ALIVE`.
 - `MODELS_CACHE_TTL_MS`: model list cache TTL.
 - `AUTH_RATE_LIMIT_*`: rate-limit window and thresholds for registration/login.
 - `CHAT_RATE_LIMIT_*`: rate-limit window and thresholds for chat and retry endpoints.
@@ -46,12 +50,18 @@ Node.js 22 or newer is required.
 
 The server is configured around an Ollama-compatible API surface:
 
-- `POST /chat`: accepts `{ model, messages, stream: true }` and returns newline-delimited JSON stream chunks with `message.content`.
+- `POST /chat`: accepts `{ model, messages, stream: true, think: boolean, keep_alive: "30m" }` and returns newline-delimited JSON chunks with optional `message.content` / `message.thinking`, ending in `done: true`.
 - `GET /tags`: returns the available model list.
 
 `qwen3:14b` is the default model for chat and roleplay. The model selector loads available models from `/tags` and selects `qwen3:14b` when available (otherwise the first returned model). Existing chats retain their saved model selection.
 
-Chat replies display Ollama's optional `message.thinking` output in a collapsed “Reasoning” section above the answer, updated through SSE `thinking` events during generation. This text is stored separately from the answer and excluded from conversation prompts. An additive SQLite migration preserves it when reopening chats; exports, imports and branches preserve it too. Models without thinking output show no section.
+The composer has independent Web Search and Reasoning toggles, both off by default and reset on server acceptance. It sends `{message, chatId, model, webSearch, reasoning}` using streamed fetch to `POST /chat/stream`. Existing SSE events carry `status` (accepted/searching/generating), `thinking` (chunk/fullThinking), `chunk` (chunk/fullReply), `done` (reply/sources), and `error`. Final answers stream incrementally, including persona responses. Persona validation still runs; a corrective pass resets provisional output before streaming its replacement. Only the validated complete answer is persisted.
+
+Every Ollama request explicitly sets `stream: true`, `think`, and `keep_alive`. Reasoning is requested and forwarded only when `reasoning === true` and the model supports the boolean thinking API. The shared conservative capability check supports Qwen3, DeepSeek R1 and DeepSeek v3.1 model IDs; unknown models, Qwen coder variants and models requiring thinking levels have the toggle disabled. Internal calls, roleplay openers and regeneration default to `think: false`. There is no extra model call to obtain reasoning.
+
+Reasoning appears only after actual thinking text arrives, expanded during generation and collapsed when the answer begins. Users can reopen it; stored messages start collapsed. The optional nullable `chat_messages.thinking` field remains separate from answer content and sources, is excluded from future prompts and logs, and survives reloads, exports, imports and branches. Old messages remain valid.
+
+Ollama reads reset the inactivity deadline on each received chunk; the overall safety limit still applies to active streams. Client disconnects and the existing Stop action abort upstream generation. Missing `done: true`, invalid streams, timeouts and upstream failures use the existing error path and never save a partial assistant response as complete. Browser EOF without a terminal SSE event is likewise an interruption. The existing UI discards temporary output on failure.
 
 The refactor adds explicit upstream timeout handling, cached model listing, and `GET /health` for degraded-state visibility.
 

public/app/api.js

@@ -17,12 +17,20 @@ export const post = (url, data) => request(url, data, "POST");
 export const put = (url, data) => request(url, data, "PUT");
 export const del = (url) => request(url, null, "DELETE");
 
-export async function stream(url, data, handlers = {}) {
+/**
+ * @typedef {{event: "status", data: {status: "accepted"|"searching"|"generating", sourceCount?: number}}
+ * | {event: "chunk", data: {chunk: string, fullReply: string}}
+ * | {event: "thinking", data: {chunk: string, fullThinking: string}}
+ * | {event: "done", data: {reply: string, sources?: import("./webSearch.js").WebSource[]}}
+ * | {event: "error", data: {error: string, code?: string}}} ChatStreamEvent
+ */
+export async function stream(url, data, handlers = {}, signal = undefined) {
     const response = await fetch(url, {
         method: "POST",
         credentials: "same-origin",
         headers: {"Content-Type": "application/json"},
-        body: JSON.stringify(data || {})
+        body: JSON.stringify(data || {}),
+        signal
     });
 
     if (!response.ok || !response.body) {
@@ -43,25 +51,38 @@ export async function stream(url, data, handlers = {}) {
     const reader = response.body.getReader();
     const decoder = new TextDecoder();
     let buffer = "";
+    let terminal = false;
 
-    while (true) {
+    try {
-        const {value, done} = await reader.read();
+        while (true) {
-        if (done) break;
+            const {value, done} = await reader.read();
-        buffer += decoder.decode(value, {stream: true});
+            if (done) break;
-        const parts = buffer.split("\n\n");
+            buffer += decoder.decode(value, {stream: true});
-        buffer = parts.pop() || "";
+            const parts = buffer.split(/\r?\n\r?\n/);
-        for (const part of parts) {
+            buffer = parts.pop() || "";
-            const lines = part.split("\n");
+            for (const part of parts) {
-            const eventLine = lines.find((line) => line.startsWith("event:"));
+                const lines = part.split("\n");
-            const dataLine = lines.find((line) => line.startsWith("data:"));
+                const eventLine = lines.find((line) => line.startsWith("event:"));
-            if (!eventLine || !dataLine) continue;
+                const dataLine = lines.find((line) => line.startsWith("data:"));
-            const event = eventLine.slice(6).trim();
+                if (!eventLine || !dataLine) continue;
-            const payload = JSON.parse(dataLine.slice(5).trim());
+                const event = eventLine.slice(6).trim();
-            if (event === "chunk" && handlers.onChunk) handlers.onChunk(payload);
+                const payload = JSON.parse(dataLine.slice(5).trim());
-            if (event === "thinking" && handlers.onThinking) handlers.onThinking(payload);
+                if (!payload || typeof payload !== "object") throw new Error("Invalid response stream.");
-            if (event === "status" && handlers.onStatus) handlers.onStatus(payload);
+                const textFields = {chunk: "fullReply", thinking: "fullThinking", status: "status", done: "reply", error: "error"};
-            if (event === "done" && handlers.onDone) handlers.onDone(payload);
+                if (textFields[event] && typeof payload[textFields[event]] !== "string") throw new Error("Invalid response stream.");
-            if (event === "error" && handlers.onError) handlers.onError(payload);
+                if (terminal) continue;
+                if (event === "chunk" && handlers.onChunk) handlers.onChunk(payload);
+                if (event === "thinking" && handlers.onThinking) handlers.onThinking(payload);
+                if (event === "status" && handlers.onStatus) handlers.onStatus(payload);
+                if (event === "done" && handlers.onDone) handlers.onDone(payload);
+                if (event === "error" && handlers.onError) handlers.onError(payload);
+                if (event === "done" || event === "error") terminal = true;
+            }
+            if (terminal) break;
         }
+        if (!terminal) throw new Error("Response was interrupted. Please try again.");
+    } finally {
+        await reader.cancel().catch(() => {});
+        reader.releaseLock();
     }
 }

public/app/webSearch.js

@@ -1,6 +1,6 @@
 /** @typedef {{title: string, url: string, snippet: string}} WebSource */
-/** @typedef {{message: string, model: string, chatId: number, webSearch?: boolean}} ChatRequest */
+/** @typedef {{message: string, model: string, chatId: number, webSearch?: boolean, reasoning?: boolean}} ChatRequest */
-/** @typedef {{role: string, content: string, sources?: WebSource[]}} ChatMessage */
+/** @typedef {{role: string, content: string, thinking?: string, sources?: WebSource[]}} ChatMessage */
 
 export function createWebSearchToggle(button) {
     let enabled = false;

public/chat.html

@@ -200,6 +200,9 @@
                         <button id="webSearch" class="icon-button" type="button" aria-label="Search the web" title="Search the web" aria-pressed="false">
                             <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" aria-hidden="true"><circle cx="12" cy="12" r="9"/><ellipse cx="12" cy="12" rx="4" ry="9"/><path d="M3 12h18"/></svg>
                         </button>
+                        <button id="reasoning" class="icon-button" type="button" aria-label="Enable reasoning" title="Enable reasoning" aria-pressed="false" disabled>
+                            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 18V5a3 3 0 0 0-5.8-1A4 4 0 0 0 3 10a4 4 0 0 0 1 7.8A4 4 0 0 0 12 18ZM12 5a3 3 0 0 1 5.8-1A4 4 0 0 1 21 10a4 4 0 0 1-1 7.8A4 4 0 0 1 12 18M8 8a4 4 0 0 1-5 2m13-2a4 4 0 0 0 5 2M8 14a4 4 0 0 0-4 4m12-4a4 4 0 0 1 4 4"/></svg>
+                        </button>
                         <label class="visually-hidden" for="msgInput">Message</label>
                         <textarea id="msgInput" rows="1" placeholder="Type your message..."></textarea>
                         <button id="send" type="button" aria-label="Send message"></button>

public/script.js

@@ -1,6 +1,6 @@
 import {del, get, post, put, stream} from "./app/api.js?v=20260909-account-controls";
 import {appendSources, createWebSearchToggle} from "./app/webSearch.js";
-import {updateReasoning} from "./app/reasoning.js";
+import {createReasoningToggle, finishReasoning, updateReasoning} from "./app/reasoning.js";
 import {closeChatDrawer, openChatDrawer} from "./app/chatDrawer.js?v=20260909-account-controls";
 import {onboardingPrompts, requestedChatId} from "./app/constants.js?v=20260909-account-controls";
 import {getModelProfile} from "./app/modelProfiles.js?v=20260909-account-controls";
@@ -106,6 +106,7 @@ import {
 const headerModelButton = document.getElementById("headerModelButton");
 const webSearchButton = document.getElementById("webSearch");
 const webSearchToggle = createWebSearchToggle(webSearchButton);
+const reasoningToggle = createReasoningToggle(document.getElementById("reasoning"));
 
 let isProcessing = false, activeChatId = null, editingPersonaId = null, editingPersonaType = "assistant", currentUsername = "";
 let chatSessions = [], currentMessages = [], assistantPersonas = [], userPersonas = [];
@@ -911,6 +912,7 @@ function renderDrawerSummary() {
 }
 
 function renderModelSection() {
+    reasoningToggle.setModel(modelSelect.value);
     updateModelHelp();
     return modelSelect?.selectedOptions[0]?.textContent || "";
 }
@@ -1361,6 +1363,7 @@ function setLoadingState(loading, overlayOptions = null) {
     isProcessing = loading;
     msgInput.disabled = loading;
     webSearchButton.disabled = loading;
+    reasoningToggle.setBusy(loading);
     sendBtn.classList.toggle("loading", loading);
     messagesDiv.querySelectorAll('[data-message-action="regenerate"]').forEach((button) => {
         button.disabled = loading || button.dataset.retryLimitReached === "true";
@@ -1811,6 +1814,7 @@ async function sendMessage() {
     const message = msgInput.value.trim();
     if (!message) return;
     const webSearch = webSearchToggle.enabled;
+    const reasoning = reasoningToggle.enabled;
     if (!activeChatId) await createNewChat();
     const currentChat = getChatById(activeChatId);
     if (currentChat && !currentChat.assistant_persona_id && currentChat.title === "New chat") {
@@ -1825,33 +1829,44 @@ async function sendMessage() {
     const loadingBody = loadingMsg.querySelector(".msg-content");
     const loadingShell = loadingMsg.querySelector(".loading-shell");
     const loadingLabel = loadingMsg.querySelector(".loading-copy strong");
-    if (webSearch) loadingLabel.textContent = "Searching the web...";
+    loadingLabel.textContent = webSearch ? "Searching the web..." : "Generating response...";
     try {
         let streamError = null;
-        await stream("/chat/stream", {message, model: modelSelect.value, chatId: activeChatId, webSearch}, {
+        await stream("/chat/stream", {message, model: modelSelect.value, chatId: activeChatId, webSearch, reasoning}, {
             onStatus: ({status, sourceCount}) => {
-                webSearchToggle.reset();
+                if (status === "accepted") {
+                    webSearchToggle.reset();
+                    reasoningToggle.reset();
+                    return;
+                }
                 loadingLabel.textContent = status === "searching" ? "Searching the web..."
                     : sourceCount === 0 ? "No web results found. Generating response..." : "Generating response...";
             },
             onThinking: ({fullThinking}) => {
+                if (!reasoning) return;
+                const follow = messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight < 100;
                 updateReasoning(loadingMsg, fullThinking, true);
-                loadingLabel.textContent = "Thinking…";
+                loadingShell?.classList.toggle("hidden", Boolean(fullThinking));
+                if (follow) scrollMessagesToBottom();
             },
             onChunk: ({fullReply}) => {
-                const reasoningSummary = loadingMsg.querySelector(".msg-reasoning summary");
+                const follow = messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight < 100;
-                if (reasoningSummary) reasoningSummary.textContent = "Reasoning";
+                if (fullReply) finishReasoning(loadingMsg);
                 if (loadingBody) {
-                    loadingShell?.classList.add("hidden");
+                    loadingShell?.classList.toggle("hidden", Boolean(fullReply));
+                    loadingLabel.textContent = "Generating response...";
                     loadingBody.classList.add("has-content");
                     setMessageContent(loadingBody, fullReply);
                 }
+                if (follow) scrollMessagesToBottom();
             },
-            onDone: () => { webSearchToggle.reset(); },
+            onDone: () => { webSearchToggle.reset(); reasoningToggle.reset(); finishReasoning(loadingMsg); },
             onError: ({error}) => {
                 streamError = error || "Failed to generate reply.";
             }
         });
+        const followOutput = messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight < 100;
+        const previousScrollTop = messagesDiv.scrollTop;
         if (messagesDiv.contains(loadingMsg)) messagesDiv.removeChild(loadingMsg);
         if (streamError) {
             if (webSearch) {
@@ -1865,15 +1880,17 @@ async function sendMessage() {
         await setActiveChat(activeChatId);
         await loadSummary();
         markOnboardingCompleted();
+        if (!followOutput) requestAnimationFrame(() => { messagesDiv.scrollTop = previousScrollTop; });
         maybeShowPersonaNudge();
         setNotice("Reply received.", "success");
-    } catch {
+    } catch (error) {
         if (messagesDiv.contains(loadingMsg)) messagesDiv.removeChild(loadingMsg);
         if (webSearch) {
             msgInput.value = message;
             resizeComposerInput();
         }
-        addMessage("[Error: Network error]"); setNotice("Network error while sending message.", "error");
+        const errorMessage = error?.message || "Network error while sending message.";
+        addMessage(`[Error: ${errorMessage}]`); setNotice(errorMessage, "error");
     } finally {
         setLoadingState(false); msgInput.focus(); updateChatActionState();
     }

public/style.css

@@ -456,9 +456,11 @@ input:focus, textarea:focus, select:focus { border-color: var(--brand); }
 .input-meta, .input-container { width: min(940px, 100%); margin-inline: auto; }
 .input-meta { margin-bottom: 5px; padding-left: 10px; }
 .composer-hint { margin: 0; color: var(--text-muted); font-size: .72rem; }
-.input-container { padding: 7px; display: grid; grid-template-columns: 44px minmax(0, 1fr) 44px; grid-template-areas: "search message send"; gap: 7px; align-items: end; background: var(--input-bg); border: 1px solid var(--border-strong); border-radius: 24px; box-shadow: var(--shadow-sm); }
+.input-container { padding: 7px; display: grid; grid-template-columns: 44px 44px minmax(0, 1fr) 44px; grid-template-areas: "search reasoning message send"; gap: 7px; align-items: end; background: var(--input-bg); border: 1px solid var(--border-strong); border-radius: 24px; box-shadow: var(--shadow-sm); }
-#webSearch { grid-area: search; width: 44px; height: 44px; display: grid; place-items: center; border-radius: 17px; }
+#webSearch, #reasoning { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 17px; }
-#webSearch[aria-pressed="true"] { color: var(--brand-strong); background: var(--brand-soft); border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand); }
+#webSearch { grid-area: search; }
+#reasoning { grid-area: reasoning; }
+#webSearch[aria-pressed="true"], #reasoning[aria-pressed="true"] { color: var(--brand-strong); background: var(--brand-soft); border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand); }
 .msg-sources { margin-top: 14px; padding-top: 10px; border-top: 1px solid var(--border); min-width: 0; font-size: .8rem; }
 .msg-sources-heading { color: var(--text-muted); margin-bottom: 6px; }
 .msg-source { display: flex; min-width: 0; flex-direction: column; gap: 2px; margin-top: 6px; }

scripts/lint.mjs

@@ -31,6 +31,8 @@ const files = [
     "public/market.js",
     "public/app/api.js",
     "public/app/webSearch.js",
+    "public/app/reasoning.js",
+    "public/app/modelCapabilities.js",
     "public/app/chatDrawer.js",
     "public/app/constants.js",
     "public/app/dom.js",

src/config.js

@@ -54,6 +54,10 @@ export function createConfig(overrides = {}) {
         chatMaxRetries: int(process.env.CHAT_MAX_RETRIES, 5),
         modelApiBaseUrl: process.env.MODEL_API_BASE_URL || "https://ai.krishd.ch/api",
         modelRequestTimeoutMs: int(process.env.MODEL_REQUEST_TIMEOUT_MS, 180000),
+        modelConnectTimeoutMs: Math.max(1, int(process.env.MODEL_CONNECT_TIMEOUT_MS, 30000)),
+        modelInactivityTimeoutMs: Math.max(1, int(process.env.MODEL_INACTIVITY_TIMEOUT_MS, int(process.env.MODEL_REQUEST_TIMEOUT_MS, 180000))),
+        modelMaxGenerationMs: Math.max(1, int(process.env.MODEL_MAX_GENERATION_MS, 600000)),
+        ollamaKeepAlive: process.env.OLLAMA_KEEP_ALIVE || "30m",
         searxngUrl: process.env.SEARXNG_URL || "",
         webSearchTimeoutMs: Math.max(1, int(process.env.WEB_SEARCH_TIMEOUT_MS, 8000)),
         modelListTimeoutMs: int(process.env.MODEL_LIST_TIMEOUT_MS, 4000),

src/routes/chats.js

@@ -22,7 +22,8 @@ const sendMessageValidator = (body) => {
     if (!chatId) return {error: "chatId is required"};
     if (!message) return {error: "message is required"};
     if (body.webSearch !== undefined && typeof body.webSearch !== "boolean") return {error: "webSearch must be a boolean"};
-    return {value: {message, chatId, model: String(body?.model || "qwen3:14b"), webSearch: body.webSearch === true}};
+    if (body.reasoning !== undefined && typeof body.reasoning !== "boolean") return {error: "reasoning must be a boolean"};
+    return {value: {message, chatId, model: String(body?.model || "qwen3:14b"), webSearch: body.webSearch === true, reasoning: body.reasoning === true}};
 };
 
 const organizationValidator = (body) => ({
@@ -236,7 +237,8 @@ export function createChatsRouter({repositories, chatService, modelService, conf
                 targetMessage,
                 content: req.validatedBody.message,
                 model: req.validatedBody.model,
-                webSearch: req.validatedBody.webSearch
+                webSearch: req.validatedBody.webSearch,
+                reasoning: req.validatedBody.reasoning
             });
             if (result.error) return res.status(result.status).json({error: result.error});
             return res.json(result);
@@ -431,7 +433,8 @@ export function createChatsRouter({repositories, chatService, modelService, conf
         res.writeHead(200, {
             "Content-Type": "text/event-stream",
             "Cache-Control": "no-cache, no-transform",
-            Connection: "keep-alive"
+            Connection: "keep-alive",
+            "X-Accel-Buffering": "no"
         });
 
         const sendEvent = (event, data) => {
@@ -449,6 +452,7 @@ export function createChatsRouter({repositories, chatService, modelService, conf
                 onChunk: (chunk, fullReply) => sendEvent("chunk", {chunk, fullReply}),
                 onThinking: (chunk, fullThinking) => sendEvent("thinking", {chunk, fullThinking}),
                 webSearch: req.validatedBody.webSearch,
+                reasoning: req.validatedBody.reasoning,
                 onStatus: (status) => sendEvent("status", status),
                 signal: generationController.signal
             });

src/services/chatService.js

@@ -19,6 +19,7 @@ import {
 } from "./chatMessageHelpers.js";
 
 import {SearXNGSearchProvider, WebSearchError, buildWebSearchContext, buildWebSearchQuery, decideWebSearch, selectSearchResults, MAX_CANDIDATES} from "./webSearchService.js";
+import {supportsReasoning} from "../../public/app/modelCapabilities.js";
 
 export function createChatService(repositories, modelService, config, webSearchProvider = new SearXNGSearchProvider(config)) {
     const chatGenerationQueues = new Map();
@@ -192,21 +193,25 @@ export function createChatService(repositories, modelService, config, webSearchP
         ], {onThinking});
     };
 
-    const generateValidatedRoleplayReply = async ({selectedModel, messagesPayload, userPersona, signal = null, generation = {}, onThinking = null}) => {
+    const generateValidatedRoleplayReply = async ({selectedModel, messagesPayload, userPersona, signal = null, generation = {}, onThinking = null, onChunk = null, reasoning = false}) => {
-        let reply = await modelService.generateReply(selectedModel, messagesPayload, {signal, generation, onThinking});
+        const generate = (messages) => onChunk
+            ? modelService.streamReply(selectedModel, messages, onChunk, {signal, generation, onThinking, reasoning})
+            : modelService.generateReply(selectedModel, messages, {signal, generation, onThinking, reasoning});
+        let reply = await generate(messagesPayload);
         if (reply && !containsUserVoiceInRoleplayOpener(reply, userPersona)) {
             return reply;
         }
 
         onThinking?.("", "");
-        reply = await modelService.generateReply(selectedModel, [
+        onChunk?.("", "");
+        reply = await generate([
             ...messagesPayload,
             {role: "assistant", content: reply || ""},
             {
                 role: "user",
                 content: "Rewrite your last reply. Hard rule: only the assistant character may speak or act. Never write or imply user speech, thoughts, feelings, reactions, decisions, or actions. Stop before the user's reply."
             }
-        ], {signal, generation, onThinking});
+        ]);
 
         if (!reply || containsUserVoiceInRoleplayOpener(reply, userPersona)) {
             return null;
@@ -320,7 +325,7 @@ export function createChatService(repositories, modelService, config, webSearchP
         return {fullReply, thinking, promptMessageId: promptMessage.id};
     };
 
-    const generateChatTurn = ({user, chatId, message, model, webSearch = false, onStatus = null, onChunk = null, onThinking = null, signal = null, parentMessageId = undefined}) =>
+    const generateChatTurn = ({user, chatId, message, model, webSearch = false, reasoning = false, onStatus = null, onChunk = null, onThinking = null, signal = null, parentMessageId = undefined}) =>
         withChatGenerationLock(chatId, async () => {
             await (summaryQueues.get(chatId) || Promise.resolve());
             const session = repositories.getChat(chatId, user);
@@ -337,17 +342,22 @@ export function createChatService(repositories, modelService, config, webSearchP
                 return {error: "Branch point not found", status: 404};
             }
             const {model: effectiveModel, generation} = getGenerationSettings(session, model);
+            const useReasoning = reasoning === true && supportsReasoning(effectiveModel);
+            signal?.throwIfAborted();
             const inserted = repositories.insertBranchChatMessage(chatId, "user", message, null, null, "pending", null, effectiveParentId);
             const userMessageId = Number(inserted?.lastInsertRowid);
             try {
                 let sources = null;
                 let thinking = "";
                 const captureThinking = (chunk, fullThinking) => {
+                    if (!useReasoning) return;
                     thinking = fullThinking;
                     onThinking?.(chunk, fullThinking);
                 };
                 let payload;
                 const fullReply = await withActiveGeneration(chatId, signal, async (activeSignal) => {
+                    activeSignal.throwIfAborted();
+                    onStatus?.({status: "accepted"});
                     if (webSearch) {
                         const searchDecision = decideWebSearch(message);
                         let searchQuery = null;
@@ -364,7 +374,6 @@ export function createChatService(repositories, modelService, config, webSearchP
                             candidateCount = candidates.length;
                             sources = selectSearchResults(message, candidates, searchDecision);
                             selectedCount = sources.length;
-                            onStatus?.({status: "generating", sourceCount: selectedCount});
                         }
                         if (config.structuredRequestLoggingEnabled) {
                             console.log(JSON.stringify({
@@ -379,6 +388,7 @@ export function createChatService(repositories, modelService, config, webSearchP
                             }));
                         }
                     }
+                    onStatus?.({status: "generating", ...(sources !== null ? {sourceCount: sources.length} : {})});
                     payload = buildConversationContext({user, chatId, session, message: null, sources});
                     return payload.activePersona
                         ? generateValidatedRoleplayReply({
@@ -387,18 +397,19 @@ export function createChatService(repositories, modelService, config, webSearchP
                             userPersona: payload.activeUserPersona,
                             signal: activeSignal,
                             generation,
-                            onThinking: captureThinking
+                            onThinking: captureThinking,
+                            onChunk,
+                            reasoning: useReasoning
                         })
                         : onChunk
-                            ? modelService.streamReply(effectiveModel, payload.messagesPayload, onChunk, {signal: activeSignal, generation, onThinking: captureThinking})
+                            ? modelService.streamReply(effectiveModel, payload.messagesPayload, onChunk, {signal: activeSignal, generation, onThinking: captureThinking, reasoning: useReasoning})
-                            : modelService.generateReply(effectiveModel, payload.messagesPayload, {signal: activeSignal, generation, onThinking: captureThinking});
+                            : modelService.generateReply(effectiveModel, payload.messagesPayload, {signal: activeSignal, generation, onThinking: captureThinking, reasoning: useReasoning});
                 });
 
                 if (!fullReply) {
                     repositories.failChatTurn(chatId, userMessageId, "Failed to generate a valid character reply", webSearch ? userMessageId : effectiveParentId);
                     return {error: "Failed to generate a valid character reply", status: 500};
                 }
-                if (payload.activePersona && onChunk) onChunk(fullReply, fullReply);
 
                 const retryState = {
                     retryVariants: [fullReply],
@@ -508,11 +519,11 @@ export function createChatService(repositories, modelService, config, webSearchP
         containsUserVoiceInRoleplayOpener,
         persistChatMessageRetryState,
         buildMessagesPayload: buildConversationContext,
-        async sendChatMessage({user, chatId, message, model, webSearch = false}) {
+        async sendChatMessage({user, chatId, message, model, webSearch = false, reasoning = false}) {
-            return generateChatTurn({user, chatId, message, model, webSearch});
+            return generateChatTurn({user, chatId, message, model, webSearch, reasoning});
         },
-        async streamChatMessage({user, chatId, message, model, webSearch = false, onStatus, onChunk, onThinking, signal = null}) {
+        async streamChatMessage({user, chatId, message, model, webSearch = false, reasoning = false, onStatus, onChunk, onThinking, signal = null}) {
-            return generateChatTurn({user, chatId, message, model, webSearch, onStatus, onChunk, onThinking, signal});
+            return generateChatTurn({user, chatId, message, model, webSearch, reasoning, onStatus, onChunk, onThinking, signal});
         },
         async retryMessage({user, chatId, selectedModel, targetMessage, retryStyle = null}) {
             return withChatGenerationLock(chatId, async () => {

src/services/modelService.js

@@ -1,4 +1,4 @@
-import {execFile} from "child_process";
+import {supportsReasoning} from "../../public/app/modelCapabilities.js";
 
 class ModelServiceError extends Error {
     constructor(code, message, status = 500) {
@@ -41,9 +41,8 @@ export function createModelService(config, overrides = {}) {
         if (state.timer) clearTimeout(state.timer);
         state.timer = setTimeout(() => {
             if (state.activeRequests > 0) return;
-            execFile("ollama", ["stop", model], () => {
+            // Ollama owns unloading through keep_alive; only clear local bookkeeping.
-                modelState.delete(model);
+            modelState.delete(model);
-            });
         }, config.modelUnloadAfterMs);
         state.timer.unref?.();
     };
@@ -74,7 +73,37 @@ export function createModelService(config, overrides = {}) {
         }
     };
 
-    const readStreamingReply = async (response, onChunk = null, onThinking = null) => {
+    const withGenerationTimeout = async (callback, externalSignal) => {
+        const controller = new AbortController();
+        let timedOut = false;
+        let idleTimer;
+        const expire = () => { timedOut = true; controller.abort(); };
+        const touch = (ms = config.modelInactivityTimeoutMs ?? config.modelRequestTimeoutMs ?? 180000) => {
+            clearTimeout(idleTimer);
+            idleTimer = setTimeout(expire, ms);
+        };
+        const abort = () => controller.abort();
+        if (externalSignal?.aborted) abort();
+        else externalSignal?.addEventListener("abort", abort, {once: true});
+        touch(config.modelConnectTimeoutMs ?? 30000);
+        const maxTimer = setTimeout(expire, config.modelMaxGenerationMs ?? 600000);
+        try {
+            controller.signal.throwIfAborted();
+            return await callback(controller.signal, touch);
+        } catch (error) {
+            if (controller.signal.aborted) {
+                throw new ModelServiceError(timedOut ? "MODEL_TIMEOUT" : "MODEL_CANCELLED",
+                    timedOut ? "Model backend timed out." : "Model request was cancelled.", timedOut ? 504 : 499);
+            }
+            throw error;
+        } finally {
+            clearTimeout(idleTimer);
+            clearTimeout(maxTimer);
+            externalSignal?.removeEventListener("abort", abort);
+        }
+    };
+
+    const readStreamingReply = async (response, onChunk = null, onThinking = null, touch = () => {}, signal = null) => {
         if (!response.body) {
             throw new ModelServiceError("MODEL_BAD_RESPONSE", "Model backend returned no body.", 502);
         }
@@ -84,9 +113,18 @@ export function createModelService(config, overrides = {}) {
         let buffer = "";
         let fullReply = "";
         let fullThinking = "";
+        let completed = false;
         const consume = (line) => {
             const data = JSON.parse(line);
-            if (data.message?.thinking) {
+            if (!data || typeof data !== "object" || data.error) {
+                throw new ModelServiceError("MODEL_BAD_RESPONSE", "Model backend returned an invalid stream.", 502);
+            }
+            for (const field of ["content", "thinking"]) {
+                if (data.message?.[field] != null && typeof data.message[field] !== "string") {
+                    throw new ModelServiceError("MODEL_BAD_RESPONSE", "Model backend returned an invalid stream.", 502);
+                }
+            }
+            if (data.message?.thinking && onThinking) {
                 fullThinking += data.message.thinking;
                 onThinking?.(data.message.thinking, fullThinking);
             }
@@ -94,29 +132,43 @@ export function createModelService(config, overrides = {}) {
                 fullReply += data.message.content;
                 onChunk?.(data.message.content, fullReply);
             }
+            if (data.done === true) completed = true;
         };
 
-        while (true) {
+        const cancel = () => { void reader.cancel().catch(() => {}); };
-            const {value, done} = await reader.read();
+        signal?.addEventListener("abort", cancel, {once: true});
-            if (done) break;
+        try {
-            buffer += decoder.decode(value, {stream: true});
+            while (!completed) {
-            const lines = buffer.split("\n");
+                signal?.throwIfAborted();
-            buffer = lines.pop() || "";
+                const {value, done} = await reader.read();
-            for (const line of lines) {
+                signal?.throwIfAborted();
-                const trimmed = line.trim();
+                if (done) break;
-                if (!trimmed) continue;
+                touch();
-                consume(trimmed);
+                buffer += decoder.decode(value, {stream: true});
+                const lines = buffer.split("\n");
+                buffer = lines.pop() || "";
+                for (const line of lines) {
+                    const trimmed = line.trim();
+                    if (!trimmed) continue;
+                    consume(trimmed);
+                    if (completed) break;
+                }
             }
-        }
 
-        if (buffer.trim()) {
+            buffer += decoder.decode();
-            consume(buffer.trim());
+            if (!completed && buffer.trim()) {
+                consume(buffer.trim());
+            }
+            if (!completed) throw new ModelServiceError("MODEL_INTERRUPTED", "Model response was interrupted.", 502);
+            return fullReply.trim();
+        } finally {
+            signal?.removeEventListener("abort", cancel);
+            await reader.cancel().catch(() => {});
+            reader.releaseLock();
         }
-
-        return fullReply.trim();
     };
 
-    const buildRequestBody = (model, messagesPayload, generation = {}) => {
+    const buildRequestBody = (model, messagesPayload, generation = {}, reasoning = false) => {
         const options = {};
         if (generation.temperature != null) options.temperature = generation.temperature;
         if (generation.contextLength != null) options.num_ctx = generation.contextLength;
@@ -127,6 +179,8 @@ export function createModelService(config, overrides = {}) {
             // retries, roleplay openers, and summaries) receives runtime date context.
             messages: [buildRuntimeDateContext(), ...messagesPayload],
             stream: true,
+            think: reasoning === true && supportsReasoning(model),
+            keep_alive: config.ollamaKeepAlive ?? "30m",
             ...(Object.keys(options).length ? {options} : {})
         };
     };
@@ -138,11 +192,11 @@ export function createModelService(config, overrides = {}) {
 
             try {
                 const startedAt = Date.now();
-                const fullReply = await withTimeout(config.modelRequestTimeoutMs, async (signal) => {
+                const fullReply = await withGenerationTimeout(async (signal, touch) => {
                     const response = await fetchImpl(`${config.modelApiBaseUrl}/chat`, {
                         method: "POST",
                         headers: {"Content-Type": "application/json"},
-                        body: JSON.stringify(buildRequestBody(model, messagesPayload, options.generation)),
+                        body: JSON.stringify(buildRequestBody(model, messagesPayload, options.generation, options.reasoning)),
                         signal
                     });
 
@@ -150,7 +204,8 @@ export function createModelService(config, overrides = {}) {
                         throw new ModelServiceError("MODEL_UPSTREAM_ERROR", `Model backend returned ${response.status}.`, 502);
                     }
 
-                    return readStreamingReply(response, null, options.onThinking);
+                    touch();
+                    return readStreamingReply(response, null, options.reasoning === true && supportsReasoning(model) ? options.onThinking : null, touch, signal);
                 }, options.signal);
                 lastHealth = {ok: true, checkedAt: new Date().toISOString(), error: null, latencyMs: Date.now() - startedAt};
                 return fullReply;
@@ -176,11 +231,11 @@ export function createModelService(config, overrides = {}) {
 
             try {
                 const startedAt = Date.now();
-                const fullReply = await withTimeout(config.modelRequestTimeoutMs, async (signal) => {
+                const fullReply = await withGenerationTimeout(async (signal, touch) => {
                     const response = await fetchImpl(`${config.modelApiBaseUrl}/chat`, {
                         method: "POST",
                         headers: {"Content-Type": "application/json"},
-                        body: JSON.stringify(buildRequestBody(model, messagesPayload, options.generation)),
+                        body: JSON.stringify(buildRequestBody(model, messagesPayload, options.generation, options.reasoning)),
                         signal
                     });
 
@@ -188,7 +243,8 @@ export function createModelService(config, overrides = {}) {
                         throw new ModelServiceError("MODEL_UPSTREAM_ERROR", `Model backend returned ${response.status}.`, 502);
                     }
 
-                    return readStreamingReply(response, onChunk, options.onThinking);
+                    touch();
+                    return readStreamingReply(response, onChunk, options.reasoning === true && supportsReasoning(model) ? options.onThinking : null, touch, signal);
                 }, options.signal);
                 lastHealth = {ok: true, checkedAt: new Date().toISOString(), error: null, latencyMs: Date.now() - startedAt};
                 return fullReply;

test/webSearch.test.js

@@ -82,7 +82,7 @@ test("every Ollama request includes dynamic server date context", async () => {
     }, {
         fetch: async (_url, options) => {
             requestBody = JSON.parse(options.body);
-            return new Response('{"message":{"content":"ok"}}\n', {status: 200});
+            return new Response('{"message":{"content":"ok"},"done":true}\n', {status: 200});
         }
     });
     assert.equal(await modelService.generateReply("test:model", [{role: "user", content: "hello"}]), "ok");
@@ -192,9 +192,10 @@ test("chat search integrates with streaming, persistence, personas, settings, re
         const [event, data] = block.split("\n");
         events.push({event: event.slice(7), data: JSON.parse(data.slice(6))});
     }
-    assert.deepEqual(events.map((event) => event.event), ["status", "status", "chunk", "chunk", "done"]);
+    assert.deepEqual(events.map((event) => event.event), ["status", "status", "status", "chunk", "chunk", "done"]);
-    assert.equal(events[0].data.status, "searching");
+    assert.equal(events[0].data.status, "accepted");
-    assert.deepEqual(events[1].data, {status: "generating", sourceCount: 1});
+    assert.equal(events[1].data.status, "searching");
+    assert.deepEqual(events[2].data, {status: "generating", sourceCount: 1});
     assert.deepEqual(events.at(-1).data.sources, [source]);
     assert.equal(searchCount, 1);
     assert.equal(lastSearchQuery, "major news events September 10, 2025 2025-09-10");