Inteligencia web para agentes de IA — un servidor MCP que obtiene URLs con estimación de tokens, almacenamiento en caché inteligente y enrutamiento inteligente integrado.
AgentFetch se sitúa entre tu agente y la web abierta. En lugar de integrar Jina, FireCrawl, pypdf y tu propia capa de caché por separado, los agentes llaman a una única herramienta MCP y AgentFetch gestiona automáticamente el enrutamiento, el almacenamiento en caché, el presupuesto de tokens y la extracción limpia a Markdown.
Este repositorio contiene el servidor MCP de código abierto. Para la API alojada + panel de control + facturación, consulta www.agentfetch.dev.
Herramienta | Para qué sirve |
| Obtener una URL → Markdown limpio + metadatos + recuento de tokens + información de caché |
| Obtener un recuento de tokens antes de realizar la obtención, para que los agentes no agoten las ventanas de contexto en páginas enormes |
| Obtener hasta 20 URLs simultáneamente |
| Búsqueda web + obtener los N mejores resultados en un solo viaje de ida y vuelta |
Internamente, AgentFetch enruta las URLs al capturador efectivo más económico:
Trafilatura (gratuito, local) para ~70% de las páginas web estándar
Jina Reader para el resto del HTML
FireCrawl para páginas con mucho JS (Twitter/X, LinkedIn, Notion, etc.)
pypdf para PDFs (coste externo cero)
La caché es Redis con un TTL de 6 horas; puedes traer la tuya o ejecutarlo sin caché.
Related MCP server: weblens-mcp
pip install agentfetch-mcpgit clone https://github.com/bch1212/agentfetch-mcp
cd agentfetch-mcp
pip install -e .Obtén una clave gratuita de Jina Reader en jina.ai (nivel gratuito de 1M de tokens/mes). FireCrawl es opcional pero recomendado para páginas con mucho JS.
export JINA_API_KEY=jina_xxx
export FIRECRAWL_API_KEY=fc-xxx # optional
export REDIS_URL=redis://localhost:6379 # optionalEdita tu configuración de MCP (~/Library/Application Support/Claude/claude_desktop_config.json en macOS, o ejecuta claude mcp add en Claude Code):
{
"mcpServers": {
"agentfetch": {
"command": "python",
"args": ["-m", "agentfetch.mcp.server"],
"env": {
"JINA_API_KEY": "jina_xxx",
"FIRECRAWL_API_KEY": "fc-xxx"
}
}
}
}Reinicia Claude. Las cuatro herramientas (fetch_url, estimate_tokens, fetch_multiple, search_and_fetch) aparecerán automáticamente.
python -m agentfetch.mcp.serverEl servidor habla MCP a través de stdio (el transporte estándar para integraciones de escritorio).
Característica | AgentFetch |
|
Estimación de tokens antes de obtener | ✓ | ✗ |
Caché inteligente (TTL 6h) | ✓ | ✗ |
Auto-enrutamiento por tipo de URL | ✓ | ✗ |
Manejo de páginas renderizadas con JS | ✓ (vía FireCrawl) | parcial |
Extracción de PDF | ✓ | ✗ |
Truncamiento para ajustar al presupuesto de contexto | ✓ | manual |
# Inside any MCP-aware agent (Claude Desktop, Claude Code, etc.)
result = fetch_url(
url="https://news.ycombinator.com",
max_tokens=2000, # cap response size
use_cache=True, # serve from cache if <6h old
)
# result.markdown → clean Markdown, ≤2000 tokens
# result.metadata → title, author, word_count, language
# result.cache.hit → True if served from cache
# result.fetch_info → which fetcher ran, cost, durationestimate = estimate_tokens(url="https://very-long-article.com")
if estimate.estimated_tokens and estimate.estimated_tokens < 5000:
result = fetch_url(url="https://very-long-article.com")
else:
# too big — skip or summarize via search_and_fetch with max_tokens_each
passresults = fetch_multiple(
urls=["https://docs.python.org/3/", "https://fastapi.tiangolo.com/", ...],
max_tokens_each=1500,
)Variable de entorno | Requerido | Predeterminado | Notas |
| Recomendado | — | El nivel gratuito cubre ~1M de tokens/mes. Sin ella, solo funciona Trafilatura (sigue siendo útil para ~70% de las páginas). |
| Opcional | — | Necesario para dominios con mucho JS (Twitter, LinkedIn, Notion). 500 créditos gratuitos al registrarse. |
| Opcional | — | Sin Redis, las obtenciones se ejecutan sin caché. |
| Opcional |
| TTL de caché para los resultados de obtención. |
git clone https://github.com/bch1212/agentfetch-mcp
cd agentfetch-mcp
pip install -e ".[dev]"
pytest tests/Si prefieres no gestionar tus propias claves, Redis o el enrutamiento tú mismo, la versión alojada en www.agentfetch.dev te ofrece:
Precios de pago por llamada desde $0.001/obtención
500 obtenciones gratuitas al registrarse, sin tarjeta de crédito
Caché Redis gestionada, conmutación por error automática entre capturadores
Panel de control con seguimiento de uso + facturas
La API alojada es un equivalente REST directo: mismas formas de respuesta, misma lógica de enrutamiento. Puedes ejecutar el MCP de código abierto localmente y la API alojada en paralelo, o migrar entre ellos en cualquier momento.
MIT — ver LICENSE.
El servidor MCP en este repositorio es de código abierto. El producto alojado, la facturación y la infraestructura de operaciones residen en un repositorio separado (privado).
Las PR son bienvenidas. Si vas a añadir un nuevo capturador (p. ej., Bright Data, ScrapingBee, etc.), por favor ajusta la interfaz FetchResult en agentfetch/core/fetchers/__init__.py y añade el coste a la lógica de enrutamiento.
Estimate token count of a URL's content WITHOUT fetching the body.
WHEN TO USE:
You're considering fetching a URL but unsure if it fits your remaining context window. This call is ~10x cheaper than a full fetch.
You want to triage a list of candidate URLs before deciding which to actually retrieve.
IMPORTANT: Many servers omit Content-Length on dynamic / chunked responses. When that happens, this tool returns confident=false and estimated_tokens=null. In that case, call fetch_url with a max_tokens cap instead of trusting the estimate.
Args: url: The URL to estimate.
Returns: { "url": str, "success": bool, "estimated_tokens": int | null, "byte_size": int | null, "content_type": str, "confident": bool, "note": str }
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations exist, but the description fully discloses behavior: no body fetch, 10x cheaper, fallback when Content-Length missing, and return structure with confident flag.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Well-structured with sections, but includes a full return example that is slightly verbose yet informative.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a one-parameter tool, the description covers purpose, usage, fallback, and return format completely, compensating for lack of output schema.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema has 0% coverage, but the description includes an 'Args' section explaining the url parameter, adding meaning beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool estimates token count without fetching the body, and distinguishes from sibling tools like fetch_url by emphasizing it does not fetch the body.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Explicitly provides when-to-use (unsure about context window, triaging URLs) and when-not-to-use (if confident=false, use fetch_url with max_tokens).
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Fetch up to 20 URLs concurrently. Each result is the same shape as fetch_url.
WHEN TO USE:
You have a list of URLs (search results, links from a doc, sitemap) and want them retrieved in parallel rather than one at a time.
Args: urls: 1–20 URLs. Larger batches: split into multiple calls. max_tokens_each: Per-result cap. Apply this to keep total response inside your context budget — total ≈ len(urls) * max_tokens_each. use_cache: True for cache-aware fetching (default).
Returns: {"count": int, "results": [, ...]}
| Name | Required | Description | Default |
|---|---|---|---|
| urls | Yes | ||
| max_tokens_each | No | ||
| use_cache | No |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Describes concurrency and per-result token cap, but no annotations present. Lacks details on error handling, rate limits, or caching behavior beyond defaults.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Well-structured into purpose, when-to-use, args, and returns. No redundant sentences, every line contributes.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Covers purpose, usage, parameters, return shape, and concurrency limit. Could include error behavior or more details on caching, but overall sufficient for a fetch tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Provides clear explanations for all three parameters: url limit and splitting, max_tokens_each token budget guidance, and use_cache caching behavior. Adds significant value over schema-only info.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Clearly states 'Fetch up to 20 URLs concurrently' with a specific verb and resource. Distinguishes from sibling tools by highlighting concurrency and batch limit.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Includes 'WHEN TO USE' section explicitly describing scenarios. Mentions splitting large batches but does not explicitly state when not to use or name alternatives like fetch_url.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Fetch any URL and return clean, LLM-ready Markdown with token count, metadata, and 6h caching.
WHEN TO USE:
You have a specific URL whose content you need.
You want to cap response size to stay inside your context window.
You want repeat fetches to be cheap (cache hits ≈ $0.0001).
The URL might be JS-rendered, a PDF, or behind a paywall — this tool auto-routes to the right fetcher (Trafilatura → Jina → FireCrawl → PDF).
WHEN NOT TO USE:
You don't know which URL to fetch — use search_and_fetch instead.
You have many URLs to fetch — use fetch_multiple instead.
Args: url: The URL to fetch. max_tokens: Hard cap on response size. Default unlimited. Pass this if you're tight on context budget — cheaper than over-fetching. format: "markdown" (default — recommended), "text", or "json". use_cache: True returns a cached copy if one exists (≤6h old). Pass False only when freshness matters (live news, prices).
Returns: { "url": str, "success": bool, "markdown": str, "metadata": {title, author, published_date, domain, word_count, token_count, reading_time_seconds, content_type, language}, "cache": {hit, cached_at, expires_at}, "fetch_info": {fetcher_used, fetch_time_ms, cost_credits}, "error": str | None }
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | ||
| max_tokens | No | ||
| format | No | markdown | |
| use_cache | No |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations exist, so the description fully bears the transparency burden. It discloses caching (6h), auto-routing to multiple fetchers, cost estimates, and return structure including error handling. This far exceeds minimal requirements.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is well-structured with sections, bullet points, and a return format sample. While fairly long, every sentence adds value—usage guidance, parameter details, and return schema. Minor conciseness loss from repetition of 'WHEN TO USE' structure.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Despite no output schema and no annotations, the description compensates fully: explains return structure in detail, caching behavior, fetcher selection logic, cost implications, and context window management (max_tokens). An agent has everything needed to invoke correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description must add context for all parameters. It explains url (implicit), max_tokens (hard cap, default unlimited, context budget advice), format (default markdown, recommended), and use_cache (default true, when to pass false). Each parameter gets meaningful guidance beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description opens with 'Fetch any URL and return clean, LLM-ready Markdown' clearly stating the verb+resource+output quality. It explicitly distinguishes from siblings 'search_and_fetch' and 'fetch_multiple' in the WHEN NOT TO USE section.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The WHEN TO USE and WHEN NOT TO USE sections provide explicit scenarios (e.g., specific URL, JS-rendered, PDF, paywall) and name alternative tools. This gives clear guidance on when to invoke this tool versus its siblings.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Web search + fetch top results in one call.
WHEN TO USE:
You have a research question, not specific URLs. E.g. "what's the latest on X", "find docs for Y library", "recent news about Z".
You'd otherwise have to call a search tool, parse results, then call fetch — this collapses that into one round-trip.
Args: query: Search query (2–500 chars). num_results: Top N to fetch (1–10, default 3). max_tokens_each: Per-result cap (default 2000).
Returns: {"query": str, "count": int, "results": [, ...]}
| Name | Required | Description | Default |
|---|---|---|---|
| query | Yes | ||
| num_results | No | ||
| max_tokens_each | No |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description effectively discloses the combined search-and-fetch behavior and the return format. However, it lacks details on error handling or failure scenarios for individual result fetches.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is well-structured with a header and 'WHEN TO USE' section, making it easy to parse. It is concise yet informative, though the parameter descriptions could be integrated more succinctly.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
The description adequately covers the tool's purpose, usage, parameters, and return format. Given no output schema, the return shape is documented. Missing details on partial failures or edge cases, but overall sufficient for this combined tool.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Despite zero schema coverage, the description fully compensates by specifying constraints (query 2-500 chars, num_results 1-10, max_tokens_each default 2000) and explaining each parameter's role, adding substantial meaning beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states 'Web search + fetch top results in one call,' which precisely defines the tool's combined action. It distinguishes itself from siblings like fetch_url and fetch_multiple by highlighting the aggregation of search and fetch into one step.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description includes a 'WHEN TO USE' section that explicitly recommends the tool for research questions rather than specific URLs. It contrasts with the alternative of using separate search and fetch tools, providing clear guidance on when to prefer this tool.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
v1.0.0estimate_tokensfetch_multiplefetch_urlsearch_and_fetchScored across 4 tools
Each tool has a clearly distinct purpose: estimate_tokens is for token estimation without body fetch, fetch_url for single URL fetch, fetch_multiple for batch fetch, search_and_fetch for combined search and fetch. No overlap in functionality.
All tool names use consistent snake_case with a verb_noun pattern. The verbs are clear (estimate, fetch, fetch, search_and_fetch) and the nouns differentiate the actions (tokens, url, multiple, and_fetch).
With 4 tools, the set is concise and well-scoped for a web fetching and searching service. Each tool addresses a core need: estimating, single fetch, batch fetch, and combined search+fetch.
The tool set covers the primary workflows of fetching URLs and searching. A possible gap is the lack of a search-only tool that returns just snippets without fetching, but given the server's focus on fetching, the current set is largely complete.
Fetch pages as markdown, search web and news, extract structured data. For AI agents.
Read any web page as clean Markdown for AI agents: fetch, search, metadata, links. SSRF-safe.
Fetch any URL and get clean Markdown. Web scraping for AI agents.
Web pages as Markdown, text or HTML, plus Google Maps places and reviews, for AI agents.