Deixe seu site pronto para agentes.
Agentes de IA já leem suas páginas. Veja o que eles recebem e entregue ferramentas de verdade com uma linha.
8.500+ sites já falam WebMCP.
Clique em qualquer um para escaneá-lo ao vivo.
Contagem: sites no ar no diretório do webmcp.com (2026-11-05). O índice Known Good, mais rigoroso, viu 541 sites registrarem ferramentas ao executar suas páginas (2026-11-04). Logos verificados com o scanner em 2026-11-07; pertencem aos seus donos, sem nenhum vínculo.
Por que WebMCP?
Dê aos agentes um contrato, não um print.
Com WebMCP, sua página entrega aos agentes de IA ferramentas tipadas que rodam na própria aba do usuário. Veja o que muda, começando pela evidência mais forte.
Agentes que terminam o trabalho
Hoje
Em sites no ar, o melhor agente testado falhou em cerca de 4 a cada 10 tarefas, principalmente em filtros, ordenação e navegação.
Com WebMCP
O agente chama uma ferramenta com entrada tipada em vez de adivinhar qual botão faz o quê.
Fontes Online-Mind2Web, 2025 WindTunnel (nekuda) Nosso benchmark
Uma fração dos tokens
Hoje
Um único snapshot de página pode custar de 12 mil a 77 mil tokens, e o agente o reenvia a cada passo.
Com WebMCP
Uma chamada devolve só os dados pedidos: até 97× menos tokens em Cloudflare no nosso benchmark (melhor caso).
Segundos, não minutos
Hoje
Olhar, pensar, clicar, repetir: em tarefas difíceis em sites no ar, agentes rodaram por até 44 minutos.
Com WebMCP
Uma chamada substitui uma sequência de cliques: mediana 3,4× mais rápida no benchmark da WindTunnel.
Sem servidor novo. Sem OAuth.
Hoje
Dar uma API aos agentes costuma exigir um backend separado, estado duplicado e um fluxo de autenticação.
Com WebMCP
As ferramentas são o seu código de front-end, rodando com a sessão que o usuário já tem. A Shopify já faz assim em produção.
Fontes Explainer do WebMCP Shopify Cloudflare
O usuário continua no controle
Hoje
O agente age longe dos olhos do usuário, ou o manda para outro lugar.
Com WebMCP
O agente trabalha na página que o usuário está vendo, e as ferramentas podem sinalizar ações que pedem confirmação.
Mesmo carrinho, mesmo formulário
Hoje
Uma API de backend não enxerga o carrinho, o formulário ou a seleção abertos na aba do usuário.
Com WebMCP
As ferramentas agem sobre o estado que o usuário vê, e a página se atualiza enquanto o agente trabalha.
Fontes Shopify
Você define o que o agente faz
Hoje
Um agente que lê a página pode clicar em tudo o que o usuário pode.
Com WebMCP
Você publica as ações, as entradas de cada uma e a sua própria validação.
Fontes Rascunho do WebMCP
Leve de pôr, seguro de ignorar
Hoje
Deixar o site pronto para agentes parece um projetão.
Com WebMCP
Alguns registros de ferramenta. Navegadores sem WebMCP os ignoram, e um header os desliga.
Fontes Rascunho do WebMCP
WebMCP é um rascunho de Community Group do W3C (2 de novembro de 2026), não um padrão do W3C, em origin trial no Chrome. As anotações são dicas que o site declara, não garantias.
Benchmark
Mesmo agente. Mesma pergunta.
Um agente lê, clica e preenche a partir de snapshots da página; o outro chama as ferramentas WebMCP do site. Escolha um modelo; as maiores economias vêm primeiro.
GPT-6 Luna (OpenAI)
Casos selecionados: 21 de 35 perguntas, em que o WebMCP usou no máximo metade dos tokens. Todos os resultados são públicos, ou rode você mesmo com just bench.
Cloudflare
“How many requests per day can my Workers handle on the Cloudflare Workers Free plan before hitting the limit?”
developers.cloudflare.com Abrir (abre Cloudflare)113k
tokens
13.1s · 10.0 passos · $4.45 por 1 mil
Resolveu 3/397× menos tokens
1.2k
tokens
3.8s · 2.0 passos · $0.15 por 1 mil
Resolveu 3/3| Pergunta | Sem WebMCP: tokens | Com webmcpx: tokens | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Cloudflare: How many requests per day can my Workers handle on the Cloudflare Workers Free plan before hitting the limit? | 113k | 1.2k | 100% | 100% |
| Cloudflare: I'm on the Workers Paid plan. What's the maximum size a single Cloudflare D1 database can grow to? | 22k | 1.0k | 100% | 100% |
| Cloudflare: What is the maximum size of a single value stored in Cloudflare Workers KV? | 21k | 1.0k | 100% | 100% |
| Cloudflare: How long can a key be in Cloudflare Workers KV? I want to know the maximum key size. | 21k | 1.5k | 100% | 100% |
| Cloudflare: What is the largest message I can send to a Cloudflare Queue? I need the per-message size limit. | 21k | 2.8k | 100% | 100% |
| Pergunta | Sem WebMCP: tempo | Com webmcpx: tempo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Cloudflare: How many requests per day can my Workers handle on the Cloudflare Workers Free plan before hitting the limit? | 13.1s | 3.8s | 100% | 100% |
| Cloudflare: I'm on the Workers Paid plan. What's the maximum size a single Cloudflare D1 database can grow to? | 6.8s | 4.7s | 100% | 100% |
| Cloudflare: What is the maximum size of a single value stored in Cloudflare Workers KV? | 7.0s | 3.5s | 100% | 100% |
| Cloudflare: How long can a key be in Cloudflare Workers KV? I want to know the maximum key size. | 6.4s | 4.9s | 100% | 100% |
| Cloudflare: What is the largest message I can send to a Cloudflare Queue? I need the per-message size limit. | 6.4s | 9.2s | 100% | 100% |
| Pergunta | Sem WebMCP: passos | Com webmcpx: passos | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Cloudflare: How many requests per day can my Workers handle on the Cloudflare Workers Free plan before hitting the limit? | 10.0 | 2.0 | 100% | 100% |
| Cloudflare: I'm on the Workers Paid plan. What's the maximum size a single Cloudflare D1 database can grow to? | 6.0 | 2.0 | 100% | 100% |
| Cloudflare: What is the maximum size of a single value stored in Cloudflare Workers KV? | 6.0 | 2.0 | 100% | 100% |
| Cloudflare: How long can a key be in Cloudflare Workers KV? I want to know the maximum key size. | 6.0 | 2.3 | 100% | 100% |
| Cloudflare: What is the largest message I can send to a Cloudflare Queue? I need the per-message size limit. | 6.0 | 3.7 | 100% | 100% |
| Pergunta | Sem WebMCP: custo | Com webmcpx: custo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Cloudflare: How many requests per day can my Workers handle on the Cloudflare Workers Free plan before hitting the limit? | $4.45 | $0.15 | 100% | 100% |
| Cloudflare: I'm on the Workers Paid plan. What's the maximum size a single Cloudflare D1 database can grow to? | $0.94 | $0.12 | 100% | 100% |
| Cloudflare: What is the maximum size of a single value stored in Cloudflare Workers KV? | $0.80 | $0.12 | 100% | 100% |
| Cloudflare: How long can a key be in Cloudflare Workers KV? I want to know the maximum key size. | $0.81 | $0.20 | 100% | 100% |
| Cloudflare: What is the largest message I can send to a Cloudflare Queue? I need the per-message size limit. | $0.86 | $0.32 | 100% | 100% |
As 2 ferramentas WebMCP que Cloudflare registra
como o agente as viu · 2026-11-07
| Ferramenta | Descrição | Chamada |
|---|---|---|
search | Full-text search across Cloudflare developer documentation. Returns matching pages with titles, URLs, and content snippets. Use this to find documentation on any Cloudflare product or feature. search({"query":"Workers Free plan requests per day limit 100,000 requests daily"}) search({"query":"D1 maximum database size Workers Paid plan single database"}) search({"query":"Cloudflare Workers KV maximum size of a single value"}) search({"query":"Cloudflare Workers KV maximum key size limit key length 512 bytes"}) search({"query":"Cloudflare Queues per-message size limit maximum message size","limit":5}) search({"query":"site:developers.cloudflare.com/queues/platform/limits/ message size 128 KB per message Cloudflare Queues","limit":5}) search({"query":"Queues Limits \"Message size\" Cloudflare 128 KB","limit":10}) search({"query":"\"Message size\" \"Queues\" \"128 KB\" Cloudflare","limit":5}) | Chamada |
list-directories | Returns a list of all Cloudflare products available in the developer documentation, including each product's name, docs URL, short description, and category group. Use this to discover what products exist before searching or navigating. | –Não chamada |
- gpt-6-luna, raciocínio medium, Chrome headless. Mesmo prompt e mesmo limite de passos nos dois cenários; 3 execuções por pergunta e cenário.
- Sem WebMCP: um agente baseado em snapshots do DOM, que lê, clica e preenche.
- Com webmcpx: só as ferramentas que a página registra.
- Avaliado pelos fatos na resposta e pelo estado da página. Sem LLM como juiz.
- Um site no ar: ele publica as próprias ferramentas WebMCP.
git clone https://github.com/webmcpx/webmcpx
cd webmcpx && just setup
OPENAI_API_KEY=sk-... just benchNotion
“I'm writing long paragraphs into a Notion page through the API. What's the maximum number of characters a single rich text object's text content can have in a request?”
developers.notion.com Abrir (abre Notion)64k
tokens
14.0s · 10.7 passos · $2.37 por 1 mil
Resolveu 3/361× menos tokens
1.0k
tokens
3.0s · 2.0 passos · $0.13 por 1 mil
Resolveu 3/3| Pergunta | Sem WebMCP: tokens | Com webmcpx: tokens | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Notion: I'm writing long paragraphs into a Notion page through the API. What's the maximum number of characters a single rich text object's text content can have in a request? | 64k | 1.0k | 100% | 100% |
| Notion: How many requests per minute does the Notion API allow per connection on plans other than Business and Enterprise? | 57k | 1.1k | 33% | 100% |
| Notion: When my Notion integration sends too many requests, what error code string does the API put in the error response body? | 38k | 1.0k | 100% | 100% |
| Notion: I'm paginating through results from the Notion API. What's the largest page_size I can request per call on the list endpoints? | 37k | 1.1k | 67% | 100% |
| Pergunta | Sem WebMCP: tempo | Com webmcpx: tempo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Notion: I'm writing long paragraphs into a Notion page through the API. What's the maximum number of characters a single rich text object's text content can have in a request? | 14.0s | 3.0s | 100% | 100% |
| Notion: How many requests per minute does the Notion API allow per connection on plans other than Business and Enterprise? | 17.3s | 3.1s | 33% | 100% |
| Notion: When my Notion integration sends too many requests, what error code string does the API put in the error response body? | 12.2s | 2.6s | 100% | 100% |
| Notion: I'm paginating through results from the Notion API. What's the largest page_size I can request per call on the list endpoints? | 11.1s | 3.0s | 67% | 100% |
| Pergunta | Sem WebMCP: passos | Com webmcpx: passos | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Notion: I'm writing long paragraphs into a Notion page through the API. What's the maximum number of characters a single rich text object's text content can have in a request? | 10.7 | 2.0 | 100% | 100% |
| Notion: How many requests per minute does the Notion API allow per connection on plans other than Business and Enterprise? | 11.7 | 2.0 | 33% | 100% |
| Notion: When my Notion integration sends too many requests, what error code string does the API put in the error response body? | 9.3 | 2.0 | 100% | 100% |
| Notion: I'm paginating through results from the Notion API. What's the largest page_size I can request per call on the list endpoints? | 9.3 | 2.0 | 67% | 100% |
| Pergunta | Sem WebMCP: custo | Com webmcpx: custo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Notion: I'm writing long paragraphs into a Notion page through the API. What's the maximum number of characters a single rich text object's text content can have in a request? | $2.37 | $0.13 | 100% | 100% |
| Notion: How many requests per minute does the Notion API allow per connection on plans other than Business and Enterprise? | $1.79 | $0.13 | 33% | 100% |
| Notion: When my Notion integration sends too many requests, what error code string does the API put in the error response body? | $1.32 | $0.12 | 100% | 100% |
| Notion: I'm paginating through results from the Notion API. What's the largest page_size I can request per call on the list endpoints? | $1.13 | $0.13 | 67% | 100% |
As 5 ferramentas WebMCP que Notion registra
como o agente as viu · 2026-11-07
| Ferramenta | Descrição | Chamada |
|---|---|---|
search_docs | Search the Notion Docs documentation for relevant pages and content. search_docs({"query":"maximum number characters single rich text object text content request API rich_text 2000"}) search_docs({"query":"requests per minute per connection plans other than Business Enterprise Notion API rate limit"}) search_docs({"query":"too many requests error response body error code string rate limit"}) search_docs({"query":"largest page_size request per call list endpoints pagination maximum 100"}) | Chamada |
get_site_overview | Get an outline of the Notion Docs documentation, grouped by section, with a short description of each page. May be truncated for large sites; use search_docs to find pages not listed. | –Não chamada |
navigate_page | Navigate the current browser tab to a Notion Docs documentation page. | –Não chamada |
read_page | Read the full content of a Notion Docs documentation page as markdown. | –Não chamada |
read_skill | Read a Notion Docs agent skill document by name. | –Não chamada |
- gpt-6-luna, raciocínio medium, Chrome headless. Mesmo prompt e mesmo limite de passos nos dois cenários; 3 execuções por pergunta e cenário.
- Sem WebMCP: um agente baseado em snapshots do DOM, que lê, clica e preenche.
- Com webmcpx: só as ferramentas que a página registra.
- Avaliado pelos fatos na resposta e pelo estado da página. Sem LLM como juiz.
- Um site no ar: ele publica as próprias ferramentas WebMCP.
git clone https://github.com/webmcpx/webmcpx
cd webmcpx && just setup
OPENAI_API_KEY=sk-... just benchspecification.website
“How long should a page's meta description be, according to this spec?”
specification.website Abrir (abre specification.website)43k
tokens
13.2s · 11.3 passos · $1.39 por 1 mil
Resolveu 3/311× menos tokens
4.0k
tokens
3.5s · 3.0 passos · $0.39 por 1 mil
Resolveu 3/3| Pergunta | Sem WebMCP: tokens | Com webmcpx: tokens | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| specification.website: How long should a page's meta description be, according to this spec? | 43k | 4.0k | 100% | 100% |
| specification.website: What's the minimum tap target size this spec requires for buttons and other interactive controls? | 41k | 4.4k | 67% | 100% |
| specification.website: What max-age should I put in my HSTS header for production, per this spec? | 18k | 3.7k | 100% | 100% |
| specification.website: What INP value does this spec set as the target for good responsiveness? | 13k | 3.3k | 100% | 100% |
| specification.website: What minimum contrast ratio does this site's spec require for normal-size body text? | 13k | 3.9k | 100% | 100% |
| Pergunta | Sem WebMCP: tempo | Com webmcpx: tempo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| specification.website: How long should a page's meta description be, according to this spec? | 13.2s | 3.5s | 100% | 100% |
| specification.website: What's the minimum tap target size this spec requires for buttons and other interactive controls? | 13.1s | 3.5s | 67% | 100% |
| specification.website: What max-age should I put in my HSTS header for production, per this spec? | 8.0s | 3.9s | 100% | 100% |
| specification.website: What INP value does this spec set as the target for good responsiveness? | 7.2s | 3.0s | 100% | 100% |
| specification.website: What minimum contrast ratio does this site's spec require for normal-size body text? | 5.9s | 3.7s | 100% | 100% |
| Pergunta | Sem WebMCP: passos | Com webmcpx: passos | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| specification.website: How long should a page's meta description be, according to this spec? | 11.3 | 3.0 | 100% | 100% |
| specification.website: What's the minimum tap target size this spec requires for buttons and other interactive controls? | 10.3 | 3.0 | 67% | 100% |
| specification.website: What max-age should I put in my HSTS header for production, per this spec? | 6.7 | 3.0 | 100% | 100% |
| specification.website: What INP value does this spec set as the target for good responsiveness? | 6.0 | 2.7 | 100% | 100% |
| specification.website: What minimum contrast ratio does this site's spec require for normal-size body text? | 6.0 | 3.0 | 100% | 100% |
| Pergunta | Sem WebMCP: custo | Com webmcpx: custo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| specification.website: How long should a page's meta description be, according to this spec? | $1.39 | $0.39 | 100% | 100% |
| specification.website: What's the minimum tap target size this spec requires for buttons and other interactive controls? | $1.34 | $0.35 | 67% | 100% |
| specification.website: What max-age should I put in my HSTS header for production, per this spec? | $0.76 | $0.31 | 100% | 100% |
| specification.website: What INP value does this spec set as the target for good responsiveness? | $0.59 | $0.29 | 100% | 100% |
| specification.website: What minimum contrast ratio does this site's spec require for normal-size body text? | $0.59 | $0.30 | 100% | 100% |
As 5 ferramentas WebMCP que specification.website registra
como o agente as viu · 2026-11-07
| Ferramenta | Descrição | Chamada |
|---|---|---|
search_spec | Search The Website Specification for matching topics. Returns ranked results with title, status, category, canonical URL, and a one-line summary. Use this when the user asks about a topic by keyword (e.g. "CSP", "alt text", "llms.txt"). search_spec({"query":"meta description recommended length characters"}) search_spec({"query":"minimum tap target size interactive controls buttons"}) search_spec({"query":"HSTS max-age production"}) search_spec({"query":"INP target good responsiveness value","limit":5}) search_spec({"query":"minimum contrast ratio normal-size body text WCAG"}) | Chamada |
get_topic | Fetch the Markdown for one spec page by its slug, returned as lines you can page through. Use this after search_spec or list_topics to read the canonical guidance. get_topic({"slug":"meta-description"}) get_topic({"slug":"touch-target-size"}) get_topic({"slug":"hsts","limit":200}) get_topic({"slug":"color-contrast"}) | Chamada |
list_topics | List spec topics, optionally filtered by category and/or status. Returns title, status, category, summary, and URL per topic. Use this when the user wants the canonical list (e.g. "all required SEO topics"). Results are paged — follow page/page_size to walk the whole list. | –Não chamada |
open_checklist | Navigate the user to the full spec checklist page. Optionally jumps to a category section via URL hash. UI action — does not return data. | –Não chamada |
open_search | Open the on-page ⌘K search overlay so the user can search the spec interactively. Optionally pre-fills a query. UI action — does not return results; use search_spec for that. | –Não chamada |
- gpt-6-luna, raciocínio medium, Chrome headless. Mesmo prompt e mesmo limite de passos nos dois cenários; 3 execuções por pergunta e cenário.
- Sem WebMCP: um agente baseado em snapshots do DOM, que lê, clica e preenche.
- Com webmcpx: só as ferramentas que a página registra.
- Avaliado pelos fatos na resposta e pelo estado da página. Sem LLM como juiz.
- Um site no ar: ele publica as próprias ferramentas WebMCP.
git clone https://github.com/webmcpx/webmcpx
cd webmcpx && just setup
OPENAI_API_KEY=sk-... just benchKiln & Co
“Add one Stoneware Teapot and one Speckled Bowl to my cart, then tell me the cart total.”
12k
tokens
7.7s · 6.0 passos · $0.45 por 1 mil
Resolveu 3/36.0× menos tokens
2.1k
tokens
3.9s · 3.7 passos · $0.26 por 1 mil
Resolveu 3/3| Pergunta | Sem WebMCP: tokens | Com webmcpx: tokens | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Kiln & Co (site de teste local): Add one Stoneware Teapot and one Speckled Bowl to my cart, then tell me the cart total. | 12k | 2.1k | 100% | 100% |
| Kiln & Co (site de teste local): I need a green gift under $30 that I can buy right now. What do you have? | 5.7k | 1.1k | 100% | 100% |
| Kiln & Co (site de teste local): Add two of the cheapest blue mug to my cart. | 5.4k | 1.6k | 100% | 100% |
| Kiln & Co (site de teste local): Put the most expensive teapot you sell in my cart. | 4.8k | 1.5k | 100% | 100% |
| Pergunta | Sem WebMCP: tempo | Com webmcpx: tempo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Kiln & Co (site de teste local): Add one Stoneware Teapot and one Speckled Bowl to my cart, then tell me the cart total. | 7.7s | 3.9s | 100% | 100% |
| Kiln & Co (site de teste local): I need a green gift under $30 that I can buy right now. What do you have? | 6.6s | 3.3s | 100% | 100% |
| Kiln & Co (site de teste local): Add two of the cheapest blue mug to my cart. | 5.1s | 3.1s | 100% | 100% |
| Kiln & Co (site de teste local): Put the most expensive teapot you sell in my cart. | 3.9s | 3.2s | 100% | 100% |
| Pergunta | Sem WebMCP: passos | Com webmcpx: passos | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Kiln & Co (site de teste local): Add one Stoneware Teapot and one Speckled Bowl to my cart, then tell me the cart total. | 6.0 | 3.7 | 100% | 100% |
| Kiln & Co (site de teste local): I need a green gift under $30 that I can buy right now. What do you have? | 4.0 | 2.0 | 100% | 100% |
| Kiln & Co (site de teste local): Add two of the cheapest blue mug to my cart. | 4.3 | 3.0 | 100% | 100% |
| Kiln & Co (site de teste local): Put the most expensive teapot you sell in my cart. | 3.7 | 3.0 | 100% | 100% |
| Pergunta | Sem WebMCP: custo | Com webmcpx: custo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Kiln & Co (site de teste local): Add one Stoneware Teapot and one Speckled Bowl to my cart, then tell me the cart total. | $0.45 | $0.26 | 100% | 100% |
| Kiln & Co (site de teste local): I need a green gift under $30 that I can buy right now. What do you have? | $0.39 | $0.19 | 100% | 100% |
| Kiln & Co (site de teste local): Add two of the cheapest blue mug to my cart. | $0.23 | $0.20 | 100% | 100% |
| Kiln & Co (site de teste local): Put the most expensive teapot you sell in my cart. | $0.25 | $0.17 | 100% | 100% |
As 4 ferramentas WebMCP que Kiln & Co registra
como o agente as viu · 2026-11-07
| Ferramenta | Descrição | Chamada |
|---|---|---|
search_products | Search the catalog. Every filter is optional; with none, returns every product. Prices are USD. search_products({"query":"Stoneware Teapot"}) search_products({"query":"Speckled Bowl"}) search_products({"color":"green","max_price":30,"sort":"price_asc"}) search_products({"category":"mug","color":"blue","sort":"price_asc"}) search_products({"category":"teapot","sort":"price_desc"}) | Chamada |
add_to_cart | Add a product to the cart by sku. Adding a sku already in the cart increases its quantity. add_to_cart({"sku":"TPT-01","quantity":1}) add_to_cart({"sku":"BWL-01","quantity":1}) add_to_cart({"sku":"MUG-03","quantity":2}) add_to_cart({"sku":"TPT-02","quantity":1}) | Chamada |
get_cart | Return the cart: items with quantity and the total in USD. | –Não chamada |
get_page_context | Describe the page the user is on: title, URL, language, meta description, heading outline and the text the user has selected. Use it for the page's structure or the user's selection; to find a fact on the page, call search_page instead. | –Não chamada |
- gpt-6-luna, raciocínio medium, Chrome headless. Mesmo prompt e mesmo limite de passos nos dois cenários; 3 execuções por pergunta e cenário.
- Sem WebMCP: um agente baseado em snapshots do DOM, que lê, clica e preenche.
- Com webmcpx: só as ferramentas que a página registra.
- Avaliado pelos fatos na resposta e pelo estado da página. Sem LLM como juiz.
- Um site de teste local: as ferramentas vêm do webmcpx.
git clone https://github.com/webmcpx/webmcpx
cd webmcpx && just setup
OPENAI_API_KEY=sk-... just benchAllbirds
“I bought my Allbirds in the US but I'm moving to London next month. Can I exchange them for another size over there?”
www.allbirds.com Abrir (abre Allbirds)27k
tokens
17.3s · 9.3 passos · $1.13 por 1 mil
Resolveu 2/34.4× menos tokens
6.0k
tokens
5.3s · 2.0 passos · $0.26 por 1 mil
Resolveu 3/3| Pergunta | Sem WebMCP: tokens | Com webmcpx: tokens | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Allbirds: I bought my Allbirds in the US but I'm moving to London next month. Can I exchange them for another size over there? | 27k | 6.0k | 67% | 100% |
| Pergunta | Sem WebMCP: tempo | Com webmcpx: tempo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Allbirds: I bought my Allbirds in the US but I'm moving to London next month. Can I exchange them for another size over there? | 17.3s | 5.3s | 67% | 100% |
| Pergunta | Sem WebMCP: passos | Com webmcpx: passos | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Allbirds: I bought my Allbirds in the US but I'm moving to London next month. Can I exchange them for another size over there? | 9.3 | 2.0 | 67% | 100% |
| Pergunta | Sem WebMCP: custo | Com webmcpx: custo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Allbirds: I bought my Allbirds in the US but I'm moving to London next month. Can I exchange them for another size over there? | $1.13 | $0.26 | 67% | 100% |
As 12 ferramentas WebMCP que Allbirds registra
como o agente as viu · 2026-11-07
| Ferramenta | Descrição | Chamada |
|---|---|---|
ask_business | Ask the store a question about its policies and services: returns, refunds and exchanges, shipping and delivery, privacy, terms, subscriptions, contact details and opening hours, or FAQ topics such as gift wrapping. The store answers it: from its own knowledge base when the store offers Ask, otherwise from its published policies, FAQ pages and articles. Put the shopper's question in ask.query in their own words, one question per call; name the topic when the shopper only implies it (e.g. a question about sending back a gift is a returns question). Read-only: it does not change the cart, place orders, or start returns. For products, prices and availability, use search_catalog or get_product. Examples of questions: - What is your return policy? - How long does shipping to Canada take? - What is your phone number? - What are your hours of operation? - Do you offer gift wrapping? ask_business({"ask":{"query":"Can I exchange Allbirds bought in the US for another size in London, UK?","context":{"intent":"moving to London next month; asking about international size exchanges"}}}) | Chamada |
browse_store | Browse OR navigate to store collections. Set navigate=true whenever the user wants to be taken to a collection page in the browser (triggers: "browse to", "go to", "show me", "open", "take me to", "navigate to" a collection or category). With navigate=false (default), returns collection or product data without changing the page — use this only when the user is asking a question about the catalog, not asking to view it. Without a collection handle, lists all collections. With a handle, returns products from that collection; use "all" to browse everything. Does NOT add anything to the cart; use create_cart or update_cart for cart changes. Prefer this over search_catalog when the user names a category, collection, or wants to explore. With navigate=true this MOVES the browser to the collection page; the tool result confirms the destination, and no further navigation is needed to show it. | –Não chamada |
cancel_cart | Remove all items from the cart in one step. Use when the user wants to empty their cart or start over. | –Não chamada |
create_cart | Create the shopper's cart with the given items, for a shopper whose cart has no items yet. It is the tool for a shopper asking to add or buy something when the cart is empty, and that request is all the authorization it needs. Each line item names a ProductVariant GID in item.id (variant_id from search_catalog or browse_store, or variants[].id from get_product for specific options) and a quantity; every item from one request fits in one call. When the cart already has items, nothing is created or changed: the result is that existing cart with an error message, and update_cart can extend it with its current lines plus the new ones. Returns the whole resulting cart, including its id and line ids. Repeating a call with the same items leaves the cart as it is. | –Não chamada |
get_cart | Get the shopper's current cart: its id, every line (line id, product and variant titles, variant id, handle, URL, image, unit price, quantity, line price) and the totals. Everything needed to describe the cart to the user in natural language, without a follow-up get_product call per line. It is also where a change to an existing cart starts from: update_cart takes the cart's id and the complete set of lines the cart should hold, and create_cart applies only to a cart with no items. Works from any page. | –Não chamada |
get_product | Get product details, OR navigate the browser to the product page. Set catalog.navigate=true whenever the user wants to see/view the product in the browser (triggers: "show me", "open", "view", "go to", "take me to", "navigate to" a product). Set catalog.navigate=false (default) only when you need data (description, options, variants, prices, availability) to answer a question or to prepare a cart change — the browser stays on the current page. Defaults to the current page's product if no catalog.id is provided. Does NOT add anything to the cart; use create_cart or update_cart for that. To view a specific variant (color/size/etc.) in the browser, use show_variant instead — it accepts partial option selections like "purple" without needing every option. To add a specific variant to the cart, call get_product with catalog.selected_options to get its variant id. With catalog.navigate=true this MOVES the browser to the product page; the tool result confirms the destination, and no further navigation is needed to show it. | –Não chamada |
get_ucp_profile | Get this store's Universal Commerce Protocol (UCP) profile, as served at /.well-known/ucp: the UCP version, the services the store offers with their endpoints (e.g. the store's UCP MCP server), its capabilities, and its payment handlers. Use it to discover how to continue a purchase with this store over UCP, or to check which platform operates the store. Read-only; works from any page. | –Não chamada |
manage_orders | Navigate to the customer's order history page. Use when the user asks about past orders, order status, tracking, or returns. The user will be prompted to log in if not already authenticated. This MOVES the browser to the order history page; the tool result confirms the destination, and no further navigation is needed to show it. | –Não chamada |
proceed_to_checkout | Proceed to checkout. Verifies the cart is not empty, then MOVES the browser to the checkout page. The tool result confirms the destination, and no further navigation is needed to show it. | –Não chamada |
search_catalog | Search the store catalog for products, collections, articles, and pages. Does NOT add anything to the cart; use create_cart or update_cart for cart changes. Each product carries variant_id, its selected or first available variant. If the user asks for a specific product variant, call get_product after search_catalog to get that variant's id, or use show_variant to display it. | –Não chamada |
show_variant | Navigate the browser to a product page, with a specific variant OR a partial option filter selected. Use for view intents: "show me", "open", "view", "go to", "take me to" a specific product configuration. Accepts EITHER variant_id (fully specified variant) OR selected_options (partial, e.g. only Color=Purple) — with partial options the first matching available variant is picked automatically, so DO NOT ask the user for missing options when their intent is to view. Does NOT add anything to the cart; use create_cart or update_cart for cart changes. For cart operations you still need a full variant_id — call get_product with the full option combination first. This MOVES the browser to the exact variant page with the variant pre-selected; the tool result confirms the destination, and no further navigation is needed to show it. | –Não chamada |
update_cart | Set the shopper's cart to exactly the given line items. This is a full replacement, not a patch: afterwards the cart holds these lines and only these. - A listed line with its line_items[].id keeps its place and is set to the given quantity, which is absolute (2 means 2, not 2 more). - A listed item without a line id is added, or, when that variant is already on one line of the cart, sets that line's quantity. - A line in the cart that is not listed is removed. It takes the cart's lines as most recently returned by get_cart, create_cart or update_cart. When the cart has changed since then (for example, the shopper edited it on the page, or a new cart replaced it), or an id is given that is not the shopper's current cart, nothing changes and the result is the current cart with an error message. Since the outcome depends only on the lines sent, repeating a call leaves the cart as it is. An empty line_items list empties the cart; leaving line_items out leaves the lines as they are. Returns the whole resulting cart, including its line ids, and messages about the call. | –Não chamada |
- gpt-6-luna, raciocínio medium, Chrome headless. Mesmo prompt e mesmo limite de passos nos dois cenários; 3 execuções por pergunta e cenário.
- Sem WebMCP: um agente baseado em snapshots do DOM, que lê, clica e preenche.
- Com webmcpx: só as ferramentas que a página registra.
- Avaliado pelos fatos na resposta e pelo estado da página. Sem LLM como juiz.
- Um site no ar: ele publica as próprias ferramentas WebMCP.
git clone https://github.com/webmcpx/webmcpx
cd webmcpx && just setup
OPENAI_API_KEY=sk-... just benchOrbit docs
“Which environment variable makes Orbit read its config file from a different path?”
2.5k
tokens
3.4s · 2.0 passos · $0.15 por 1 mil
Resolveu 3/32.5× menos tokens
989
tokens
3.4s · 2.0 passos · $0.12 por 1 mil
Resolveu 3/3| Pergunta | Sem WebMCP: tokens | Com webmcpx: tokens | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Orbit docs (site de teste local): Which environment variable makes Orbit read its config file from a different path? | 2.5k | 989 | 100% | 100% |
| Orbit docs (site de teste local): By default, how many past releases does Orbit keep for rollback? | 2.5k | 992 | 100% | 100% |
| Pergunta | Sem WebMCP: tempo | Com webmcpx: tempo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Orbit docs (site de teste local): Which environment variable makes Orbit read its config file from a different path? | 3.4s | 3.4s | 100% | 100% |
| Orbit docs (site de teste local): By default, how many past releases does Orbit keep for rollback? | 2.1s | 2.1s | 100% | 100% |
| Pergunta | Sem WebMCP: passos | Com webmcpx: passos | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Orbit docs (site de teste local): Which environment variable makes Orbit read its config file from a different path? | 2.0 | 2.0 | 100% | 100% |
| Orbit docs (site de teste local): By default, how many past releases does Orbit keep for rollback? | 2.0 | 2.0 | 100% | 100% |
| Pergunta | Sem WebMCP: custo | Com webmcpx: custo | Sem WebMCP: resolvida | Com webmcpx: resolvida |
|---|---|---|---|---|
| Orbit docs (site de teste local): Which environment variable makes Orbit read its config file from a different path? | $0.15 | $0.12 | 100% | 100% |
| Orbit docs (site de teste local): By default, how many past releases does Orbit keep for rollback? | $0.15 | $0.12 | 100% | 100% |
As 3 ferramentas WebMCP que Orbit docs registra
como o agente as viu · 2026-11-07
| Ferramenta | Descrição | Chamada |
|---|---|---|
search_page | Find passages on the current page that match a query. Returns up to `limit` passages ranked by relevance, each with its section heading and a link to it. Prefer it to reading the whole page when looking for something specific. search_page({"query":"environment variable config file path Orbit","limit":5}) search_page({"query":"past releases rollback default","limit":5}) | Chamada |
fetch_as_markdown | Return the main content of the current page as Markdown. Long pages come in parts: when `truncated` is true, call again with `cursor` set to `next_cursor`. | –Não chamada |
get_page_context | Describe the page the user is on: title, URL, language, meta description, heading outline and the text the user has selected. Use it for the page's structure or the user's selection; to find a fact on the page, call search_page instead. | –Não chamada |
- gpt-6-luna, raciocínio medium, Chrome headless. Mesmo prompt e mesmo limite de passos nos dois cenários; 3 execuções por pergunta e cenário.
- Sem WebMCP: um agente baseado em snapshots do DOM, que lê, clica e preenche.
- Com webmcpx: só as ferramentas que a página registra.
- Avaliado pelos fatos na resposta e pelo estado da página. Sem LLM como juiz.
- Um site de teste local: as ferramentas vêm do webmcpx.
git clone https://github.com/webmcpx/webmcpx
cd webmcpx && just setup
OPENAI_API_KEY=sk-... just benchWebMCP vs MCP
A mesma ideia de ferramenta. Outro lugar.
O WebMCP pega emprestado o modelo de ferramentas do MCP, mas é uma API do navegador, não o protocolo MCP. Os dois se complementam.
| Aspecto | WebMCP | MCP |
|---|---|---|
| Onde a ferramenta roda | No JavaScript da sua página, na aba do usuário. | Em um processo de servidor, local (stdio) ou remoto. |
| Como o agente chama | Uma API do navegador, document.modelContext; o navegador intermedeia cada chamada. Sem JSON-RPC. | JSON-RPC 2.0 via stdio ou Streamable HTTP. |
| O que você roda | O front-end que você já tem. Nenhum servidor novo. | Um servidor MCP que você hospeda e opera. |
| Autenticação | A sessão em que o usuário já está logado. Nenhum token para emitir. | Autorização baseada em OAuth para servidores remotos. |
| Descoberta | Assim que a página abre. Não há nada a descobrir antes da visita. | tools/list em um endpoint conhecido, e registries públicos. |
| Ciclo de vida | Enquanto a página estiver aberta. | Sempre ativo, sem precisar de navegador. |
| O usuário | Presente, na mesma página que o agente. | Opcional: funciona headless. |
| Abrange | Só ferramentas, com schemas de entrada e saída. | Ferramentas, recursos e prompts, além de elicitation e extensões. |
| Dicas nas ferramentas | readOnlyHint, consequentialHint, untrustedContentHint. Mesma origem (same-origin) por padrão. | readOnlyHint, destructiveHint, idempotentHint, openWorldHint. |
| Status | Rascunho de Community Group do W3C; em origin trial no Chrome. | Um projeto da Linux Foundation, com mais de 10.000 servidores públicos. |
Use os dois
O MCP atende agentes que nunca abrem o seu site. O WebMCP atende agentes que trabalham na sua aba, ao lado do seu usuário. Rode os dois sobre o mesmo backend: a Shopify já faz isso.
Fontes Rascunho do WebMCP Explainer do WebMCP Especificação do MCP Shopify nos dois
Uma linha. Pronto para agentes.
Cole antes de </body>. Onde não há WebMCP, ele não faz nada.
<script type="module" src="https://cdn.jsdelivr.net/npm/[email protected]/src/auto.js"></script>ou npm i webmcpx para npmou npx skills add webmcpx/webmcpx para seu agente de código
search_pageacha o trecho certofetch_as_markdownlê a página, paginadaget_page_contextsabe onde está
~2,7 KB ao carregar · Rust + WebAssembly · MIT
Das issues da spec