${escapeHtml(title)}

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{ parseVal, serveFile } from \"https://esm.town/v/std/utils/index.ts\";\nimport { Hono } from \"npm:hono\";\nimport { generatePage } from \"./celeris.ts\";\n\nconst app = new Hono();\n\n// Serve index.html at the root /\napp.get(\"/\", () => serveFile(\"/frontend/index.html\"));\n\n// Serve all /frontend files\napp.get(\"/frontend/**/*\", (c) => serveFile(c.req.path));\n\n// View source redirect\napp.get(\"/source\", (c) => c.redirect(parseVal().links.self.val));\n\n/**\n * Codegen, as a server-sent event stream.\n *\n * The pipeline makes several Celeris calls (markup, continuations, behaviour),\n * and each one streams back in ~256-token diffusion blocks. Rather than hide\n * that behind one slow request, every block and every call boundary is forwarded\n * to the client so the UI can show the machinery and the timings as they happen.\n */\napp.post(\"/api/generate\", async (c) => {\n const { instructions } = await c.req.json().catch(() => ({}));\n\n const clean = Array.isArray(instructions)\n ? instructions.filter((s): s is string => typeof s === \"string\" && s.trim() !== \"\")\n .map((s) => s.trim())\n : [];\n\n if (clean.length === 0) {\n return c.json({ error: \"Missing 'instructions'.\" }, 400);\n }\n\n const encoder = new TextEncoder();\n const stream = new ReadableStream({\n async start(controller) {\n const send = (event: unknown) => {\n controller.enqueue(encoder.encode(`data: ${JSON.stringify(event)}\\n\\n`));\n };\n try {\n await generatePage(clean, send);\n } catch (err) {\n const message = err instanceof Error ? err.message : String(err);\n console.error(\"generate failed:\", message);\n send({ type: \"error\", message });\n } finally {\n controller.close();\n }\n },\n });\n\n return new Response(stream, {\n headers: {\n \"Content-Type\": \"text/event-stream; charset=utf-8\",\n \"Cache-Control\": \"no-cache, no-transform\",\n \"Connection\": \"keep-alive\",\n // Discourage proxy buffering, which would defeat the point of streaming.\n \"X-Accel-Buffering\": \"no\",\n },\n });\n});\n\n// Unwrap and rethrow Hono errors as the original error\n// If you delete this, all errors will be \"Internal Server Error\"\napp.onError((err) => Promise.reject(err));\n\n// HTTP vals expect an exported \"fetch handler\"\n// This is how you \"run the server\" in Val Town with Hono\nexport default app.fetch;\n","label","celeris-coder",[153],"6d0ce4e7-26ab-4e21-9576-b7f6ad27a221","celeris.ts","0fd0ba18-87b9-11f1-8984-1607ee4eb77e",74,["D",1784938496545],23,"/**\n * Server-side wrapper around the Celeris API (celeris-1).\n *\n * ## Why this file is shaped the way it is\n *\n * **A WAF sits in front of the API.** Request bodies containing common XSS\n * signatures are rejected with a 403 and an nginx error page (not the documented\n * JSON envelope). Escaping doesn't help. Only *inbound* traffic is filtered —\n * generated output is never touched.\n *\n * Blocked: script, style, iframe, object, embed, link, meta, svg tags,\n * ` Math.ceil(s.length / 4);\n\nconst BLOCKED = new RegExp(\n [\n \"(?:<|<)\\\\s*/?\\\\s*(?:script|style|iframe|object|embed|link|meta|svg)\\\\b\",\n \"(?:<|<)!\\\\s*DOCTYPE\",\n \"\\\\son[a-z]{2,}\\\\s*=\", // inline event handlers\n \"\\\\sstyle\\\\s*=\", // inline style attributes\n \"xlink\\\\s*:\\\\s*href\",\n \"javascript\\\\s*:\",\n \"data:[a-z]+/\", // data: URIs with a mime type\n ].join(\"|\"),\n \"i\",\n);\nexport const hasBlockedLiteral = (s: string) => BLOCKED.test(s);\n\n/**\n * Strip the constructs above so a section can still be used as *context* for a\n * later call. Only applied to the copy we send — the original text is what ends\n * up in the assembled page. Not usable for continuation prefills, which must\n * match the model's own output byte for byte.\n */\nexport function sanitizeForRequest(s: string): string {\n return s\n .replace(/<\\s*(script|style|svg|iframe|object|embed)\\b[\\s\\S]*?<\\s*\\/\\s*\\1\\s*>/gi, \"\")\n .replace(/<\\s*(?:link|meta)\\b[^>]*>/gi, \"\")\n .replace(/]*>/gi, \"\")\n .replace(/\\son[a-z]{2,}\\s*=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s>]+)/gi, \"\")\n .replace(/\\sstyle\\s*=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s>]+)/gi, \"\")\n .replace(/\\sxlink\\s*:\\s*href\\s*=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s>]+)/gi, \"\")\n .replace(/javascript\\s*:/gi, \"\")\n .replace(/data:[a-z]+\\//gi, \"\");\n}\n\n/**\n * celeris-1 sometimes wraps output in a markdown fence, sometimes with the\n * opening backticks missing. See https://docs.celeris.ai/known-issues\n */\nexport function stripFence(content: string): string {\n return content\n .trim()\n .replace(/^(?:```[a-zA-Z]*|html)[ \\t]*\\r?\\n/, \"\")\n .replace(/\\r?\\n```[ \\t]*$/, \"\")\n .trim();\n}\n\n// ---------------------------------------------------------------- prompts\n// These must not contain the blocked patterns — hence \"styling tags\" and\n// \"scripting tags\" rather than the obvious spellings.\n\nconst MARKUP_SYSTEM = `You write the inner markup for a web page body, styled\nentirely with Tailwind CSS utility classes.\n- Output raw markup only. No prose, no code fences.\n- No head section, no doctype, no styling tags, no scripting tags.\n- Style everything with Tailwind utility classes in the class attribute. Never\n write out a stylesheet, and never use the inline style attribute — for a\n one-off value use Tailwind's arbitrary syntax instead, like h-[40%] or\n w-[3px]. This matters: an inline style attribute breaks generation.\n- You cannot style the page element itself, so wrap everything in one root\n element carrying the background, min-height and layout utilities.\n- No inline event-handler attributes. Give each interactive element a clear id\n so behaviour can be attached separately.\n- No images, icons, vector graphics, embedded objects, frames or external\n resource links. For decoration use text and emoji only.\n- Prefer Tailwind's built-in scale, and use responsive and state variants\n (sm: md: hover: focus:) where they earn their place.`;\n\nconst JS_SYSTEM = `You write plain JavaScript.\n- Output raw JavaScript only. No prose, no code fences, no markup tags.\n- The DOM is already parsed when your code runs.\n- Appearance is handled entirely by Tailwind utility classes already present in\n the markup. Never assign to .style and never inject CSS. To change how\n something looks, add or remove Tailwind classes with classList.\n- Write only behaviour: state, events, timers, and text updates.\n- If the page needs no interactivity, output nothing at all.`;\n\n// ---------------------------------------------------------------- events\n\nexport type SectionName = \"markup\" | \"js\";\n\nexport type GenEvent =\n | { type: \"phase\"; section: SectionName; message: string }\n | { type: \"call-start\"; section: SectionName; round: number; continuing: boolean }\n | { type: \"delta\"; section: SectionName; text: string }\n | {\n type: \"call-end\";\n section: SectionName;\n round: number;\n completionTokens: number;\n promptTokens: number;\n ms: number;\n blocks: number;\n tokensPerSecond: number;\n finishReason: string;\n }\n | { type: \"note\"; message: string }\n | { type: \"preview\"; html: string }\n | { type: \"done\"; html: string; truncated: boolean; jsDropped: boolean; stats: GenerateStats }\n | { type: \"error\"; message: string };\n\nexport type Emit = (event: GenEvent) => void;\n\n// ---------------------------------------------------------------- API call\n\ninterface StreamedCall {\n content: string;\n finishReason: string;\n completionTokens: number;\n promptTokens: number;\n /** wall clock around the request — Server-Timing is useless when streaming */\n ms: number;\n /** number of SSE delta events, i.e. diffusion blocks */\n blocks: number;\n}\n\nasync function readError(res: Response): Promise {\n const raw = await res.text().catch(() => \"\");\n let detail = \"\";\n try {\n detail = JSON.parse(raw)?.error?.message ?? \"\";\n } catch { /* WAF pages aren't JSON */ }\n\n switch (res.status) {\n case 401:\n return \"Celeris rejected the API key (401). Check CELERIS_API_KEY.\";\n case 402:\n return \"The Celeris workspace is out of prepaid credit (402).\";\n case 403:\n return \"Blocked by the Celeris edge proxy (403) — a request body reached it \"\n + \"containing a blocked tag or attribute.\";\n case 400:\n case 413:\n return `Celeris rejected the request (${res.status}). ${detail}`.trim();\n case 429:\n return `Rate limited by Celeris. Retry in ${res.headers.get(\"Retry-After\") ?? \"a few\"}s.`;\n default:\n return `Celeris error ${res.status}. ${detail}`.trim();\n }\n}\n\nasync function streamCeleris(\n apiKey: string,\n messages: { role: string; content: string }[],\n continuing: boolean,\n maxTokens: number,\n onDelta: (text: string) => void,\n): Promise {\n const startedAt = performance.now();\n\n const res = await fetch(`${BASE_URL}/chat/completions`, {\n method: \"POST\",\n headers: { \"Authorization\": `Bearer ${apiKey}`, \"Content-Type\": \"application/json\" },\n body: JSON.stringify({\n model: MODEL,\n messages,\n max_tokens: maxTokens,\n temperature: 0,\n seed: 7,\n stream: true,\n stream_options: { include_usage: true },\n // vLLM passthrough: resume the trailing assistant message instead of\n // starting a fresh turn. Without this the model restarts from scratch.\n ...(continuing\n ? {\n continue_final_message: true,\n add_generation_prompt: false,\n // Once it finishes it likes to announce a second draft, or narrate\n // corrections to itself in comments. Cut all of that off.\n stop: [\n \"```\",\n \"\\nBelow is\",\n \"\\nHere is\",\n \"\\nHere's\",\n \"\\n// Wait\",\n \"\\n// Note:\",\n \"\\n// Let's\",\n \"\\n// Fixed\",\n \"\\n// Actually\",\n ],\n }\n : {}),\n }),\n signal: AbortSignal.timeout(30_000),\n });\n\n if (!res.ok || !res.body) throw new Error(await readError(res));\n\n const reader = res.body.getReader();\n const decoder = new TextDecoder();\n let buffer = \"\";\n let content = \"\";\n let blocks = 0;\n let finishReason = \"stop\";\n let completionTokens = 0;\n let promptTokens = 0;\n\n while (true) {\n const { done, value } = await reader.read();\n if (done) break;\n buffer += decoder.decode(value, { stream: true });\n\n const lines = buffer.split(\"\\n\");\n buffer = lines.pop() ?? \"\";\n\n for (const line of lines) {\n if (!line.startsWith(\"data:\")) continue;\n const payload = line.slice(5).trim();\n if (!payload || payload === \"[DONE]\") continue;\n\n let json: any;\n try {\n json = JSON.parse(payload);\n } catch {\n continue;\n }\n\n const choice = json.choices?.[0];\n const delta = choice?.delta?.content;\n if (delta) {\n blocks++;\n content += delta;\n onDelta(delta);\n }\n if (choice?.finish_reason) finishReason = choice.finish_reason;\n if (json.usage) {\n completionTokens = json.usage.completion_tokens ?? completionTokens;\n promptTokens = json.usage.prompt_tokens ?? promptTokens;\n }\n }\n }\n\n const ms = performance.now() - startedAt;\n return { content, finishReason, completionTokens, promptTokens, ms, blocks };\n}\n\n// ---------------------------------------------------------------- sections\n\ninterface Section {\n text: string;\n /** false when we stopped early — out of rounds, out of context, or unsafe to continue */\n complete: boolean;\n rounds: number;\n completionTokens: number;\n promptTokens: number;\n ms: number;\n}\n\n/**\n * Generate one section, continuing across as many calls as it takes. Only safe\n * while the accumulated text stays clear of the blocked patterns, since it gets\n * resent verbatim on the next round.\n */\nasync function generateSection(\n apiKey: string,\n section: SectionName,\n system: string,\n user: string,\n emit: Emit,\n maxTokens = MAX_TOKENS,\n): Promise

{\n let text = \"\";\n let rounds = 0;\n let completionTokens = 0;\n let promptTokens = 0;\n let ms = 0;\n let complete = false;\n\n while (rounds < MAX_ROUNDS) {\n const fixed = estimateTokens(system) + estimateTokens(user) + 64;\n if (fixed + estimateTokens(text) + maxTokens > INPUT_BUDGET) {\n emit({ type: \"note\", message: \"Stopped: no context room left for another round.\" });\n break;\n }\n\n const messages = [\n { role: \"system\", content: system },\n { role: \"user\", content: user },\n ];\n const continuing = text.length > 0;\n if (continuing) messages.push({ role: \"assistant\", content: text });\n\n const round = rounds + 1;\n emit({ type: \"call-start\", section, round, continuing });\n\n let call: StreamedCall;\n try {\n call = await streamCeleris(\n apiKey,\n messages,\n continuing,\n maxTokens,\n (delta) => emit({ type: \"delta\", section, text: delta }),\n );\n } catch (err) {\n // A failed continuation shouldn't throw away the rounds that succeeded.\n // Keep what we have and let the caller assemble a partial page — unless\n // we have nothing at all, in which case there's no page to salvage.\n if (!text) throw err;\n emit({\n type: \"note\",\n message: `Round ${round} failed (${\n err instanceof Error ? err.message : String(err)\n }). Keeping what was generated.`,\n });\n break;\n }\n\n rounds++;\n completionTokens += call.completionTokens;\n promptTokens += call.promptTokens;\n ms += call.ms;\n text += call.content;\n\n emit({\n type: \"call-end\",\n section,\n round,\n completionTokens: call.completionTokens,\n promptTokens: call.promptTokens,\n ms: call.ms,\n blocks: call.blocks,\n tokensPerSecond: call.ms > 0 ? (call.completionTokens / call.ms) * 1000 : 0,\n finishReason: call.finishReason,\n });\n\n if (call.finishReason !== \"length\") {\n complete = true;\n break;\n }\n if (hasBlockedLiteral(text)) {\n // Not fatal: continuation resumes from whatever assistant text we hand it,\n // so we can strip the offending bit and carry on. The stripped characters\n // are things we never wanted in the output anyway (inline styles, stray\n // tags), so this improves the page as well as unblocking it.\n const cleaned = sanitizeForRequest(text);\n if (hasBlockedLiteral(cleaned)) {\n emit({\n type: \"note\",\n message: \"Output hit something the proxy blocks that can't be cleaned. Stopping here.\",\n });\n break;\n }\n emit({\n type: \"note\",\n message: `Cleaned ${text.length - cleaned.length} blocked characters, continuing.`,\n });\n text = cleaned;\n }\n }\n\n return { text: stripFence(text), complete, rounds, completionTokens, promptTokens, ms };\n}\n\n// ---------------------------------------------------------------- assembly\n\nconst escapeHtml = (s: string) =>\n s.replace(/[&<>\"]/g, (c) => ({ \"&\": \"&\", \"<\": \"<\", \">\": \">\", '\"': \""\" }[c]!));\n\nfunction assemble(markup: string, js: string, title: string): string {\n // The only place blocked literals appear — in output we build ourselves,\n // which never travels back to the API.\n const scriptBlock = js.trim()\n ? `\\n`\n : \"\";\n\n return `\n\n\n\n\n${escapeHtml(title)}\n\n\n\n${markup}${scriptBlock}\n\n\n`;\n}\n\n/** The first instruction is a whole spec sentence; trim it to a usable title. */\nfunction toTitle(instruction: string): string {\n const head = (instruction.split(/[:.—]/)[0] ?? instruction).trim();\n return head.length <= 60 ? head : head.slice(0, 57).replace(/\\s+\\S*$/, \"\") + \"…\";\n}\n\n/**\n * On long continuations celeris-1 sometimes emits invalid JavaScript — a stray\n * `function () => {`, a half-rewritten handler — and one syntax error takes down\n * every listener on the page. `new Function` compiles without executing, which\n * catches it before it ships.\n */\nfunction isValidJs(source: string): boolean {\n if (!source.trim()) return true;\n try {\n new Function(source);\n return true;\n } catch {\n return false;\n }\n}\n\n/** Drop trailing comment-only lines, usually the model talking to itself. */\nfunction trimTrailingComments(source: string): string {\n const lines = source.split(\"\\n\");\n while (lines.length && /^\\s*(?:\\/\\/.*)?$/.test(lines[lines.length - 1])) lines.pop();\n return lines.join(\"\\n\");\n}\n\n// ---------------------------------------------------------------- public API\n\nexport function buildSpec(instructions: string[]): string {\n if (instructions.length === 1) return instructions[0];\n const list = instructions.map((s, i) => `${i + 1}. ${s}`).join(\"\\n\");\n return `Build one page satisfying all of these, in order:\\n${list}`;\n}\n\nexport interface GenerateStats {\n calls: number;\n completionTokens: number;\n promptTokens: number;\n /** summed wall clock of the Celeris requests */\n celerisMs: number;\n /** wall clock for the whole pipeline on the server */\n pipelineMs: number;\n tokensPerSecond: number;\n sections: { markup: number; js: number };\n}\n\nexport async function generatePage(instructions: string[], emit: Emit): Promise {\n const apiKey = Deno.env.get(\"CELERIS_API_KEY\");\n if (!apiKey) throw new Error(\"CELERIS_API_KEY is not set on this val.\");\n\n const startedAt = performance.now();\n const spec = buildSpec(instructions);\n const title = toTitle(instructions[0] ?? \"Untitled\");\n\n // 1. The page itself, styled inline with Tailwind utilities.\n emit({ type: \"phase\", section: \"markup\", message: \"Writing the page\" });\n const markup = await generateSection(apiKey, \"markup\", MARKUP_SYSTEM, spec, emit);\n\n // Show the page as soon as it exists, before behaviour is wired up.\n emit({ type: \"preview\", html: assemble(markup.text, \"\", title) });\n\n // 2. Behaviour, written against the page's ids. Split into its own call\n // because the model reliably loses track when asked to produce markup and\n // JavaScript in one continuous stream — it drifts back into markup partway\n // through the script. Two calls also let us sanitize the page before\n // passing it along, which a byte-exact continuation prefix can't do.\n emit({ type: \"phase\", section: \"js\", message: \"Making it interactive\" });\n const jsPrompt = `Spec: ${spec}\\n\\nMarkup to wire up:\\n${sanitizeForRequest(markup.text)}`;\n const js = await generateSection(apiKey, \"js\", JS_SYSTEM, jsPrompt, emit, 512);\n\n let jsText = trimTrailingComments(js.text);\n let jsRetry: Section | null = null;\n let jsDropped = false;\n\n if (!isValidJs(jsText)) {\n emit({ type: \"note\", message: \"The JavaScript didn't parse. Trying once more.\" });\n jsRetry = await generateSection(\n apiKey,\n \"js\",\n `${JS_SYSTEM}\\n- Keep it short. Fewer features, correct syntax.`,\n jsPrompt,\n emit,\n 512,\n );\n const retryText = trimTrailingComments(jsRetry.text);\n if (isValidJs(retryText)) {\n jsText = retryText;\n } else {\n jsText = \"\";\n jsDropped = true;\n emit({ type: \"note\", message: \"Still didn't parse. Shipping the page without interactivity.\" });\n }\n }\n\n const completionTokens = markup.completionTokens + js.completionTokens +\n (jsRetry?.completionTokens ?? 0);\n const celerisMs = markup.ms + js.ms + (jsRetry?.ms ?? 0);\n const jsRounds = js.rounds + (jsRetry?.rounds ?? 0);\n\n emit({\n type: \"done\",\n html: assemble(markup.text, jsText, title),\n truncated: !markup.complete,\n jsDropped,\n stats: {\n calls: markup.rounds + jsRounds,\n completionTokens,\n promptTokens: markup.promptTokens + js.promptTokens + (jsRetry?.promptTokens ?? 0),\n celerisMs,\n pipelineMs: performance.now() - startedAt,\n tokensPerSecond: celerisMs > 0 ? (completionTokens / celerisMs) * 1000 : 0,\n sections: { markup: markup.rounds, js: jsRounds },\n },\n });\n}\n",[165],"e65c6872-02e9-476e-b770-59925293493c","README.md","019f967f-2c90-70b9-bd1c-5b6f7df1d30e",67,["D",1784938224680],3,"# Celeris Coder\n\nChat-driven HTML codegen on the [Celeris](https://celeris.ai) API. Three columns:\nchat and machinery logs on the left, raw output streaming in the middle, live\npreview on the right. Remixed from\n[`templates/react-hono-starter`](https://www.val.town/x/templates/react-hono-starter).\n\n`CELERIS_API_KEY` is an env var on this val, read only server-side in\n`celeris.ts`. The browser never sees it.\n\n## Measured API behavior\n\nSeveral of these contradict the docs. All were established by probing.\n\n| | |\n| --- | --- |\n| Context window | **8,192** — `models.md` says 4,096, but 7,018 + 1,024 is accepted (`/v1/models` and `errors.md` agree on 8,192) |\n| `max_tokens` | `256 \\| 512 \\| 768 \\| 1024`. This is the diffusion block size — see below |\n| Streaming | Works, but at **~256-token granularity**: 1,024 tokens arrives in 4 SSE events ~90ms apart, not hundreds of small ones |\n| `Server-Timing` | Useless when streaming — it only covers time to headers (~4ms). Per-call timing here is wall clock |\n| Tool calling | **Works**, though absent from the API reference. `tools` and `tool_choice: \"required\"` behave like OpenAI's |\n| `continue_final_message` | **Works** — vLLM passthrough, undocumented, and works while streaming |\n| Throughput | 1,000–2,800 tok/s observed per call |\n\n### Why the output is chunky\n\nceleris-1 is a diffusion model: it denoises a block of tokens in parallel rather\nthan emitting them left to right. So the stream delivers whole blocks. The UI\nleans into this — you watch ~256 tokens of markup snap into place at a time,\nwhich is a fairly good visualisation of how the model actually works.\n\n### The WAF\n\nAn nginx proxy in front of the API returns **403** (an HTML error page, not the\ndocumented JSON envelope) for request bodies containing common XSS signatures.\nEscaping doesn't help — `<script>` is blocked too. Only *inbound* traffic\nis filtered; generated output is never touched.\n\n**Blocked**\n- tags: `script` `style` `iframe` `object` `embed` `link` `meta` `svg`\n- `/`\n\n**Allowed**\n- `form` `input` `button` `a` `img` `details` `section` `nav` `footer` `table`\n- `class=` `aria-*=` `data-*=`, Tailwind arbitrary values like `h-[40%]`\n- ordinary JS: `eval(`, `document.cookie`, `url(`, `@import`\n\nTwo of these were found the hard way. `svg` broke an early version because the\nmarkup prompt was *telling* the model to use inline SVG. `style=` broke the\ndashboard at round 3, because the model reached for `style=\"height: 40%\"` on\nchart bars — the fix was telling it to use `h-[40%]`, which passes.\n\n## How generation works\n\nA whole document can't be generated in one call (1,024-token cap) and can't be\nsent back for editing (the WAF blocks it). So the page is built in two pieces\nthat are each WAF-safe, and assembled here:\n\n1. **Markup** — body markup styled with Tailwind utility classes, no\n head/doctype/style/script/svg\n2. **JS** — plain JavaScript wired to the markup's ids\n\nBecause each piece stays clear of the blocklist, it can be fed back to be\n*continued*. A section loops up to 6 rounds while `finish_reason` is `length`,\nusing `continue_final_message` plus stop sequences (it likes to announce a\nsecond draft, or narrate corrections to itself in comments, once it finishes).\n`temperature: 0` and a fixed seed keep successive generations stable.\n\nFollow-up messages append to a running instruction list and regenerate — they\ndon't edit the document, since that would mean sending it back.\n\n### Was Tailwind worth it?\n\nPartly. It removes the stylesheet phase entirely, which is a reliable win in\ncalls and in visual quality. Tokens depend on page size:\n\n| Page | Handwritten CSS | Tailwind |\n| --- | --- | --- |\n| Pomodoro timer | 3 calls, 1,313 tok | 2 calls, **985 tok** |\n| Coffee landing page | 7 calls, **4,147 tok** | 6 calls, 4,572 tok |\n\nUtility classes repeat on every element, while a stylesheet amortises a rule\nacross many. So Tailwind wins on small and medium pages and loses slightly on\nlarge repetitive ones. Note also that prompt tokens grow quickly with\ncontinuation rounds, since each round resends everything so far — a 4,500-token\npage cost ~16,000 prompt tokens. That's the real billing driver.\n\n## Files\n\n```\nindex.ts Hono server: static files + SSE POST /api/generate\nceleris.ts Celeris client, prompts, continuation, assembly\nfrontend/\n index.html Shell (Twind + React)\n index.tsx React entrypoint\n components/\n App.tsx SSE consumption, state, three-column layout\n ChatPanel.tsx Left: messages, per-call logs, stats summary\n CodePanel.tsx Middle: output as it streams\n PreviewPanel.tsx Right: sandboxed iframe\n```\n\n## Gotchas\n\n- **Don't rewrite the system prompts in `celeris.ts` to use literal tag\n spellings.** They say \"styling tags\" and \"scripting tags\" on purpose. The\n obvious phrasing 403s every request.\n- A failed continuation round keeps the rounds that already succeeded rather\n than losing the whole page — partial output beats an error.\n- Generated JS is syntax-checked with `new Function` before shipping. On long\n continuations celeris-1 sometimes emits invalid JS, and one syntax error would\n disable every listener on the page. One retry, then the page ships without\n behaviour.\n- The preview iframe is sandboxed `allow-scripts` *without* `allow-same-origin`,\n so generated code runs in an opaque origin.\n- celeris-1 leaves diffusion artifacts in longer output: dropped and duplicated\n words (\"Frequently Questions\", \"Ultra-ide Monitor\"), stray unmatched tags.\n Cosmetic, but visible.\n- The HTTP endpoint is public — anyone with the URL can spend Celeris credits.\n",[173],"cbb9bdee-db06-4f56-baf6-924dfa62e891","AGENTS.md","faaac7dc-87bd-11f1-a878-1607ee4eb77e",80,["D",1784938544917],0,"# Celeris Coder\n\n## Purpose\n\nChat-driven HTML code generation using the Celeris API. Keep Celeris's input WAF constraints in mind: generated script/style-like markup may be returned to users, but blocked literals must not be sent back to the API.\n\n## Conventions\n\n- Prefer Hono for routing.\n- Keep files small, ideally under 200 lines where practical.\n- Preserve generated output rather than silently deleting it when validation fails.\n- Verify HTTP changes through the live endpoint and check logs.\n\n## File map\n\n- `AGENTS.md` — project instructions and file map.\n- `README.md` — architecture, measured Celeris behavior, and operational notes.\n- `index.ts` — Hono HTTP entrypoint, static serving, and SSE generation API.\n- `celeris.ts` — Celeris streaming client, prompts, continuation logic, and HTML assembly.\n- `debug_single.ts` — standalone probe for single-document generation and continuation.\n- `frontend/index.html` — browser shell and frontend dependencies.\n- `frontend/index.tsx` — React entrypoint.\n- `frontend/favicon.svg` — app icon.\n- `frontend/components/App.tsx` — generation state, SSE consumption, and layout.\n- `frontend/components/ChatPanel.tsx` — prompt history, generation log, and statistics.\n- `frontend/components/CodePanel.tsx` — generated HTML display.\n- `frontend/components/PreviewPanel.tsx` — sandboxed live preview.\n",[181],"9b1d41e0-6c18-47ae-b25d-5577921a2eea","frontend","019f967f-2c90-70b9-bd1c-5417eeb2bfc3",["D",1784936344655],"directory",[189],"pulls","branches","forks","envVars",{"_201":62,"_203":185},"connections",{"_201":185,"_202":185},"count","unfilledCount","emptyCount",{"_42":188,"_32":189,"_30":190,"_154":-5,"_40":41,"_39":62,"_156":25,"_37":291,"_13":185,"_33":192,"_35":-5,"_24":48,"_161":-5,"_218":292,"_27":293},{"_42":287,"_32":261,"_30":255,"_154":190,"_40":41,"_39":62,"_156":25,"_37":288,"_13":185,"_33":192,"_35":-5,"_24":48,"_161":-5,"_218":289,"_27":290},{"_42":279,"_32":280,"_30":281,"_154":255,"_40":41,"_39":282,"_156":48,"_37":283,"_13":158,"_33":34,"_35":284,"_24":48,"_161":-5,"_218":285,"_27":286},{"_42":270,"_32":271,"_30":272,"_154":255,"_40":41,"_39":273,"_156":48,"_37":274,"_13":275,"_33":34,"_35":276,"_24":48,"_161":-5,"_218":277,"_27":278},{"_42":262,"_32":263,"_30":264,"_154":255,"_40":41,"_39":265,"_156":48,"_37":266,"_13":62,"_33":34,"_35":267,"_24":48,"_161":-5,"_218":268,"_27":269},{"_42":252,"_32":253,"_30":254,"_154":255,"_40":41,"_39":256,"_156":48,"_37":257,"_13":185,"_33":34,"_35":258,"_24":48,"_161":-5,"_218":259,"_27":260},{"_42":245,"_32":246,"_30":247,"_154":190,"_40":41,"_39":62,"_156":25,"_37":248,"_13":185,"_33":20,"_35":249,"_24":48,"_161":-5,"_218":250,"_27":251},{"_42":237,"_32":238,"_30":239,"_154":190,"_40":41,"_39":240,"_156":48,"_37":241,"_13":177,"_33":20,"_35":242,"_24":48,"_161":-5,"_218":243,"_27":244},{"_42":230,"_32":231,"_30":232,"_154":190,"_40":41,"_39":62,"_156":25,"_37":233,"_13":185,"_33":34,"_35":234,"_24":48,"_161":-5,"_218":235,"_27":236},{"_42":180,"_32":181,"_30":182,"_154":-5,"_40":41,"_39":183,"_156":25,"_37":227,"_13":185,"_33":20,"_35":186,"_24":48,"_161":-5,"_218":228,"_27":229},{"_42":172,"_32":173,"_30":174,"_154":-5,"_40":41,"_39":175,"_156":48,"_37":224,"_13":177,"_33":20,"_35":178,"_24":48,"_161":-5,"_218":225,"_27":226},{"_42":164,"_32":165,"_30":166,"_154":-5,"_40":41,"_39":167,"_156":48,"_37":221,"_13":169,"_33":34,"_35":170,"_24":48,"_161":-5,"_218":222,"_27":223},{"_42":152,"_32":153,"_30":57,"_154":-5,"_40":41,"_39":155,"_156":48,"_37":217,"_13":158,"_33":159,"_35":160,"_24":48,"_161":162,"_218":219,"_27":220},["D",1784937982673],"children",[],[153],["D",1784938496545],[],[165],["D",1784938224680],[],[173],["D",1784938544917],[],[181],"b62009e8-168a-4024-bb0e-94659488da9f","index.tsx","019f967f-2c90-70b9-bd1c-5181fb04bee1",["D",1784936344655],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { createRoot } from \"https://esm.sh/react-dom@18.2.0/client\";\nimport { App } from \"./components/App.tsx\";\n\nconst root = document.getElementById(\"root\");\nif (!root) {\n throw new Error(\"No root element found\");\n}\n\ncreateRoot(root).render();",[],[189,231],"ac70065e-ea47-4518-9525-80a50d6a4706","index.html","019f967f-2c90-70b9-bd1c-4ff447b9289d",78,["D",1784938532837],"\n\n \n \n \n Celeris Coder\n \n \n \n \n \n \n

\n \n \n \n\n",[],[189,238],"7671c052-01b6-4f8f-ae96-7ddf7cddd192","favicon.svg","019f967f-2c90-70b9-bd1c-49c497e10f32",["D",1784936344655],"\n",[],[189,246],"62fdf7db-68f0-44f0-af5b-a1d51bc4331f","PreviewPanel.tsx","c76f88ae-87bc-11f1-ae53-1607ee4eb77e","019f967f-2c90-70b9-bd1c-44ae412bc6c1",56,["D",1784938029463],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\n\nexport function PreviewPanel(\n { html, truncated, jsDropped }: {\n html: string;\n truncated: boolean;\n jsDropped: boolean;\n },\n) {\n return (\n

\n Preview\n

\n\n {truncated && (\n

\n A section ran out of continuation rounds, so this page may be incomplete.\n

\n )}\n {jsDropped && (\n

\n The generated JavaScript failed a syntax check twice, so the page\n shipped without behaviour.\n

\n )}\n\n

\n {html\n ? (\n \n )\n : (\n

\n Nothing generated yet.\n

\n )}\n

\n );\n}\n",[],[189,261,253],"components","28bea006-550b-44ed-893e-c1f93e31db50","CodePanel.tsx","c23de72c-87bc-11f1-8c3b-1607ee4eb77e",76,["D",1784938518335],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useMemo, useRef } from \"https://esm.sh/react@18.2.0\";\nimport hljs from \"https://esm.sh/highlight.js@11.9.0/lib/core\";\nimport xml from \"https://esm.sh/highlight.js@11.9.0/lib/languages/xml\";\nimport javascript from \"https://esm.sh/highlight.js@11.9.0/lib/languages/javascript\";\n\n// The xml grammar delegates the contents of a script tag to the javascript\n// grammar, so registering both gives embedded JS highlighting for free.\nhljs.registerLanguage(\"xml\", xml);\nhljs.registerLanguage(\"javascript\", javascript);\n\n/**\n * Middle column: the raw output as it arrives.\n *\n * celeris-1 is a diffusion model, so this doesn't type out character by\n * character — it lands in ~256-token blocks, a few per call. The jumpiness is\n * the architecture, not a buffering bug.\n */\nexport function CodePanel(\n { code, phase, streaming }: {\n code: string;\n phase: string | null;\n streaming: boolean;\n },\n) {\n const scrollRef = useRef(null);\n\n // Partial markup mid-stream is malformed by definition; hljs degrades to\n // plain text on the unclosed tail rather than throwing, which is fine here.\n const highlighted = useMemo(() => {\n if (!code) return \"\";\n try {\n return hljs.highlight(code, { language: \"xml\" }).value;\n } catch {\n return null; // fall back to unhighlighted text\n }\n }, [code]);\n\n useEffect(() => {\n if (streaming) scrollRef.current?.scrollTo({ top: scrollRef.current.scrollHeight });\n }, [code, streaming]);\n\n return (\n

\n {phase ?? \"Code\"}\n {streaming && (\n \n )}\n

\n {code && !streaming && (\n navigator.clipboard.writeText(code)}\n className=\"text-[11px] px-2 py-1 rounded border border-gray-700 text-gray-400 hover:bg-gray-800 transition-colors cursor-pointer\"\n >\n Copy\n \n )}\n

\n\n \n {!code\n ? Output appears here as it streams.\n : highlighted\n ? \n : {code}}\n \n

\n  );\n}\n",[],[189,261,263],"b2dd837f-b234-4bce-b44e-e64faf465fab","ChatPanel.tsx","229a86b0-87b9-11f1-b2d7-1607ee4eb77e",57,["D",1784938055554],5,"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useEffect, useRef, useState } from \"https://esm.sh/react@18.2.0\";\nimport type { FeedItem, Summary } from \"./App.tsx\";\n\nconst EXAMPLES = [\n  \"A pricing page with three tiers\",\n  \"A pomodoro timer with start/reset\",\n  \"A dark landing page for a coffee brand\",\n];\n\nconst ms = (n: number) => n >= 1000 ? `${(n / 1000).toFixed(2)}s` : `${Math.round(n)}ms`;\nconst num = (n: number) => Math.round(n).toLocaleString();\n\n/** Per-call machinery: which round, how many diffusion blocks, how fast. */\nfunction LogLine({ item }: { item: Extract }) {\n  return (\n    \n      \n        {item.tone === \"phase\" ? \"▸\" : \"·\"}\n      \n      \n        {item.text}\n      \n      {item.detail && {item.detail}}\n    
\n  );\n}\n\n/** End-of-run totals, including the round trip we measure in the browser. */\nfunction SummaryCard({ summary }: { summary: Summary }) {\n  const overhead = Math.max(0, summary.roundTripMs - summary.celerisMs);\n  const cells: [string, string][] = [\n    [\"round trip\", ms(summary.roundTripMs)],\n    [\"model\", ms(summary.celerisMs)],\n    [\"overhead\", ms(overhead)],\n    [\"first paint\", ms(summary.firstDeltaMs)],\n    [\"out / in tok\", `${num(summary.completionTokens)} / ${num(summary.promptTokens)}`],\n    [\"calls\", `${summary.calls}`],\n  ];\n\n  return (\n    \n      \n        \n          {num(summary.tokensPerSecond)}\n        \n        tok/s\n      
\n      \n        {cells.map(([label, value]) => (\n          \n            {value}\n            {label}\n          
\n        ))}\n      
\n    
\n  );\n}\n\nexport function ChatPanel({\n  feed,\n  loading,\n  onSend,\n  onReset,\n}: {\n  feed: FeedItem[];\n  loading: boolean;\n  onSend: (instruction: string) => void;\n  onReset: () => void;\n}) {\n  const [draft, setDraft] = useState(\"\");\n  const scrollRef = useRef(null);\n\n  useEffect(() => {\n    scrollRef.current?.scrollTo({ top: scrollRef.current.scrollHeight, behavior: \"smooth\" });\n  }, [feed.length, loading]);\n\n  function submit() {\n    const text = draft.trim();\n    if (!text || loading) return;\n    onSend(text);\n    setDraft(\"\");\n  }\n\n  return (\n    \n      \n        \n          Celeris Coder
\n          \n            HTML codegen on celeris-1\n          
\n        
\n        {feed.length > 0 && (\n          \n            Reset\n          \n        )}\n      
\n\n      \n        {feed.length === 0 && (\n          \n            \n              Describe a page. Each follow-up is added to the spec and the page\n              is regenerated.\n            
\n            \n              {EXAMPLES.map((example) => (\n                 onSend(example)}\n                  className=\"block w-full text-left px-3 py-2 rounded-lg border border-gray-200 bg-white hover:border-blue-400 hover:text-blue-700 transition-colors cursor-pointer\"\n                >\n                  {example}\n                \n              ))}\n            
\n          
\n        )}\n\n        {feed.map((item, i) => {\n          if (item.kind === \"user\") {\n            return (\n              \n                \n                  {item.text}\n                
\n              
\n            );\n          }\n          if (item.kind === \"log\") return ;\n          if (item.kind === \"summary\") return ;\n          return (\n            \n              {item.text}\n            
\n          );\n        })}\n\n        {loading && (\n          working…
\n        )}\n      
\n\n      \n         setDraft((e.target as HTMLTextAreaElement).value)}\n          onKeyDown={(e) => {\n            if (e.key === \"Enter\" && !e.shiftKey) {\n              e.preventDefault();\n              submit();\n            }\n          }}\n          rows={3}\n          placeholder=\"Describe a page…  (Enter to send)\"\n          className=\"w-full resize-none rounded-lg border border-gray-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent\"\n        />\n        \n          {loading ? \"Generating…\" : \"Generate\"}\n        \n        \n          view source\n        
\n      
\n    \n  );\n}\n",[],[189,261,271],"f2d5f616-a5a1-4c41-b35d-32a1c4d09c10","App.tsx","019f967f-2c90-70b9-bd1c-3c6a91fd68da",75,["D",1784938502439],"/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport { useState } from \"https://esm.sh/react@18.2.0\";\nimport { ChatPanel } from \"./ChatPanel.tsx\";\nimport { CodePanel } from \"./CodePanel.tsx\";\nimport { PreviewPanel } from \"./PreviewPanel.tsx\";\n\nexport interface Summary {\n  calls: number;\n  completionTokens: number;\n  promptTokens: number;\n  celerisMs: number;\n  tokensPerSecond: number;\n  /** measured in the browser — the number the user actually feels */\n  roundTripMs: number;\n  /** browser-measured time until the first block of output appeared */\n  firstDeltaMs: number;\n}\n\nexport type FeedItem =\n  | { kind: \"user\"; text: string }\n  | { kind: \"log\"; text: string; detail?: string; tone?: \"phase\" | \"call\" }\n  | { kind: \"summary\"; summary: Summary }\n  | { kind: \"error\"; text: string };\n\nconst SECTION_LABEL: Record = {\n  markup: \"Writing the page\",\n  js: \"Making it interactive\",\n};\n\nexport function App() {\n  const [feed, setFeed] = useState([]);\n  // The running spec. We regenerate from this each turn rather than sending the\n  // document back for edits — the Celeris edge proxy 403s request bodies\n  // containing script/style/svg/etc. See celeris.ts.\n  const [instructions, setInstructions] = useState([]);\n  const [code, setCode] = useState(\"\");\n  const [phase, setPhase] = useState(null);\n  const [html, setHtml] = useState(\"\");\n  const [truncated, setTruncated] = useState(false);\n  const [jsDropped, setJsDropped] = useState(false);\n  const [loading, setLoading] = useState(false);\n\n  const push = (item: FeedItem) => setFeed((prev) => [...prev, item]);\n\n  async function send(instruction: string) {\n    if (loading) return;\n    const next = [...instructions, instruction];\n\n    setLoading(true);\n    setInstructions(next);\n    setCode(\"\");\n    setTruncated(false);\n    setJsDropped(false);\n    push({ kind: \"user\", text: instruction });\n\n    const startedAt = performance.now();\n    let firstDeltaMs = 0;\n\n    try {\n      const res = await fetch(\"/api/generate\", {\n        method: \"POST\",\n        headers: { \"Content-Type\": \"application/json\" },\n        body: JSON.stringify({ instructions: next }),\n      });\n\n      if (!res.ok || !res.body) {\n        const err = await res.json().catch(() => ({}));\n        throw new Error(err?.error ?? `Request failed (${res.status})`);\n      }\n\n      const reader = res.body.getReader();\n      const decoder = new TextDecoder();\n      let buffer = \"\";\n\n      while (true) {\n        const { done, value } = await reader.read();\n        if (done) break;\n        buffer += decoder.decode(value, { stream: true });\n\n        // SSE frames are separated by a blank line.\n        const frames = buffer.split(\"\\n\\n\");\n        buffer = frames.pop() ?? \"\";\n\n        for (const frame of frames) {\n          const line = frame.split(\"\\n\").find((l) => l.startsWith(\"data:\"));\n          if (!line) continue;\n\n          const event = JSON.parse(line.slice(5).trim());\n\n          switch (event.type) {\n            case \"phase\":\n              setPhase(SECTION_LABEL[event.section] ?? event.message);\n              push({ kind: \"log\", text: event.message, tone: \"phase\" });\n              break;\n\n            case \"delta\":\n              if (!firstDeltaMs) firstDeltaMs = performance.now() - startedAt;\n              setCode((prev) => prev + event.text);\n              break;\n\n            case \"call-end\":\n              push({\n                kind: \"log\",\n                text: `call ${event.round} · ${event.blocks} block${\n                  event.blocks === 1 ? \"\" : \"s\"\n                }`,\n                detail: `${event.completionTokens} tok · ${Math.round(event.ms)}ms · ${\n                  Math.round(event.tokensPerSecond).toLocaleString()\n                } tok/s`,\n                tone: \"call\",\n              });\n              break;\n\n            case \"note\":\n              push({ kind: \"log\", text: event.message });\n              break;\n\n            case \"preview\":\n              setHtml(event.html);\n              break;\n\n            case \"done\": {\n              const roundTripMs = performance.now() - startedAt;\n              setHtml(event.html);\n              setCode(event.html);\n              setPhase(\"Final document\");\n              setTruncated(Boolean(event.truncated));\n              setJsDropped(Boolean(event.jsDropped));\n              push({\n                kind: \"summary\",\n                summary: { ...event.stats, roundTripMs, firstDeltaMs },\n              });\n              break;\n            }\n\n            case \"error\":\n              throw new Error(event.message);\n          }\n        }\n      }\n    } catch (err) {\n      push({ kind: \"error\", text: err instanceof Error ? err.message : String(err) });\n      // Keep the spec in sync with what actually rendered.\n      setInstructions(instructions);\n    } finally {\n      setLoading(false);\n    }\n  }\n\n  function reset() {\n    setFeed([]);\n    setInstructions([]);\n    setCode(\"\");\n    setPhase(null);\n    setHtml(\"\");\n    setTruncated(false);\n    setJsDropped(false);\n  }\n\n  return (\n    \n      \n      \n      \n    \n  );\n}\n",[],[189,261,280],"165d8dc7-c163-4232-8e49-8111375de75c",["D",1784936344655],[206,207,208,209],[189,261],["D",1784936344655],[205,210,211,212],[189],["D",1784936344655],["D",1789474235934],{"_103":102,"_110":106},{"_103":102,"_104":-5,"_105":106,"_18":55,"_107":108,"_109":48},{"_13":88,"_32":89,"_42":41,"_90":43,"_91":92,"_93":94,"_95":50,"_96":97,"_98":99,"_100":44,"_101":102},"ctx",{"_81":-5,"_132":332,"_333":334,"_335":336,"_337":48,"_338":48,"_339":48,"_340":25,"_341":-5,"_342":-7,"_343":-7,"_344":185,"_345":48,"_346":48,"_347":-5,"_348":48,"_349":48,"_350":48,"_351":-5},"ENV",{"_303":304,"_305":306,"_307":89,"_308":309,"_310":311,"_312":313,"_314":315,"_316":317,"_318":319,"_320":321,"_322":323,"_324":325,"_326":327,"_328":329,"_330":331},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

Diff · v82