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obscura-mcp

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obscura-mcp

Ein MCP-Server-Adapter für Obscura, einen leichtgewichtigen, in Rust geschriebenen Headless-Browser für Scraping und KI-Agenten-Automatisierung.

Stellt Obscuras native CDP-Funktionen über eine saubere MCP-Schnittstelle bereit – keine Chrome-Abhängigkeit, keine schwerfällige Browser-Automatisierung.

Installation

npm install -g obscura-mcp

Die Installation erfolgt sofort – die Browser-Binärdatei (~80 MB) wird bei der ersten Verwendung verzögert heruntergeladen.

Führen Sie nach der Installation entweder:

  • obscura-mcp install aus, um die Binärdatei mit sichtbarem Fortschritt herunterzuladen, oder

  • einfach obscura-mcp aus – die Binärdatei wird automatisch heruntergeladen und der Server gestartet.

Die Binärdatei wird unter ~/.obscura/bin/ zwischengespeichert und übersteht npm-Upgrades.

Um einen benutzerdefinierten Pfad zur Binärdatei zu verwenden:

export OBSCURA_PATH=/path/to/obscura

Related MCP server: Algonius Browser

Schnellstart

# Install
npm install -g obscura-mcp

# Verify
obscura-mcp --version

# Download browser binary
obscura-mcp install

# Start MCP server
obscura-mcp --transport stdio

Tools

browse_url

Ruft eine URL mithilfe der CDP-Engine von Obscura ab. Gibt den Seiteninhalt zurück.

Parameter:

  • url (string, erforderlich): HTTP- oder HTTPS-URL, die besucht werden soll.

  • dump (string, optional): html, text oder links. Standardwert ist html.

  • cookies (array, optional): Cookies, die vor der Navigation eingefügt werden sollen. Akzeptiert das gleiche Format, das von browse_cookies zurückgegeben wird – verwenden Sie aus einem echten Browser exportierte Cookies, um auf authentifizierte Seiten zuzugreifen.

  • stealth (boolean, optional): Zur Kompatibilität akzeptiert. Das Stealth-Verhalten wird vom Obscura-Server gesteuert.

browse_evaluate

Navigiert zu einer URL und führt JavaScript im Seitenkontext aus. Gibt das ausgewertete Ergebnis zurück.

Parameter:

  • url (string, erforderlich): Die zu besuchende URL.

  • expression (string, erforderlich): Der auszuwertende JavaScript-Ausdruck. Beispiele: document.title, navigator.userAgent, document.querySelector('h1').textContent.

  • stealth (boolean, optional): Zur Kompatibilität akzeptiert.

browse_cookies

Navigiert zu einer URL und ruft alle von der Seite gesetzten Cookies ab. Gibt für jedes Cookie Name, Wert, Domain, Pfad und Ablaufdatum zurück.

Parameter:

  • url (string, erforderlich): Die zu besuchende URL.

  • stealth (boolean, optional): Zur Kompatibilität akzeptiert.

Konfiguration

Claude Desktop / Cline / Continue / Beliebiger MCP-Client

{
  "mcpServers": {
    "obscura-mcp": {
      "command": "obscura-mcp",
      "args": ["--transport", "stdio"]
    }
  }
}

VS Code (Cline-Erweiterung)

{
  "servers": {
    "obscura-mcp": {
      "command": "obscura-mcp",
      "args": ["--transport", "stdio"]
    }
  }
}

Nach der globalen npm-Installation befindet sich obscura-mcp in Ihrem PATH – absolute Pfade sind nicht erforderlich.

Umgebungsvariablen

Variable

Standardwert

Beschreibung

OBSCURA_PATH

—

Pfad zur benutzerdefinierten Obscura-Binärdatei

MCP_HTTP_HOST

127.0.0.1

HTTP-Transport-Host

MCP_HTTP_PORT

3000

HTTP-Transport-Port

MCP_TRANSPORT

stdio

Transportmodus: stdio oder streamable-http

OBSCURA_STARTUP_TIMEOUT_MS

15000

Millisekunden, die auf den Start von Obscura CDP gewartet wird

OBSCURA_NAVIGATION_WAIT_MS

3000

Millisekunden, die nach der Seitennavigation gewartet wird

CDP_REQUEST_TIMEOUT_MS

10000

Millisekunden, die auf eine CDP-Antwort gewartet wird

Warum Obscura?

  • Kein Chrome – reines Rust, kein 200 MB Browser-Bundle

  • CDP-nativ – stellt das Chrome DevTools Protocol direkt bereit

  • Anti-Erkennung – integrierter Stealth-Modus für Scraping-resistente Websites

  • Winziger Speicherbedarf – ~15 MB Binärdatei, startet in Millisekunden

Lizenz

MIT

Available Tools

3 tools
browse_cookiesA

Navigate to a URL and retrieve all cookies set by the page. Returns cookie name, value, domain, path, and expiry for each cookie.

ParametersJSON Schema
NameRequiredDescriptionDefault
urlYesThe URL to visit
stealthNoAccepted for compatibility. Stealth behavior is controlled by the Obscura server.

TDQS

A3.5/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

While annotations are absent, the description explains the stealth parameter's acceptance for compatibility and that actual behavior is server-controlled, adding some transparency. However, it does not disclose potential side effects like network requests, cookie setting by the page, or any required permissions.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description consists of two efficient sentences: the first states the purpose, the second details return fields. No wasted words, perfectly front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no output schema and simple parameters, the description covers the core purpose and return structure. However, it omits error handling (e.g., invalid URL), edge cases (empty cookie set), and lacks usage context relative to siblings, leaving some gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so baseline is 3. The description adds value for the stealth parameter by clarifying it is accepted but not effective, but for the url parameter it merely restates the schema. Overall, moderately helpful beyond schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb 'Navigate' and 'retrieve', the resource 'URL' and 'cookies', and specifies the scope 'all cookies set by the page'. It also lists the returned fields, making the tool's function unambiguous and distinct from sibling tools like browse_url or browse_evaluate.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description does not provide any guidance on when to use this tool versus its siblings (browse_url, browse_evaluate). There is no mention of prerequisites, limitations, or alternative use cases, leaving the agent to infer the appropriate context.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

browse_evaluateA

Navigate to a URL and execute JavaScript in the page context. Returns the evaluated result as a string. Supports extracting data, clicking elements, filling forms, and reading page state.

ParametersJSON Schema
NameRequiredDescriptionDefault
urlYesThe URL to visit
expressionYesJavaScript expression to evaluate in the page context. The result is JSON-stringified. Examples: 'document.title', 'navigator.userAgent', 'document.querySelector("h1").textContent'
stealthNoAccepted for compatibility. Stealth behavior is controlled by the Obscura server.

TDQS

A4/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided, so the description carries full burden. It reveals the tool modifies page state (via clicking/filling forms) and returns stringified results, but omits details on side effects (e.g., session changes, error handling).

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with no wasted words. The first sentence states the primary action, the second lists capabilities, making it efficient and front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given no output schema and no annotations, the description covers the main purpose and common use cases. However, it lacks details on return format for failures or async evaluation, slightly limiting completeness.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% (baseline 3). The description adds value for the 'stealth' parameter by explaining compatibility and server control, and the 'expression' examples help, but overall schema already defines parameters clearly.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool navigates to a URL and executes JavaScript, listing specific capabilities like extracting data, clicking elements, filling forms, and reading page state. It distinguishes from siblings (browse_cookies, browse_url) by focusing on script evaluation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description lists supported actions but does not explicitly guide when to use this tool versus alternatives. It lacks when-not guidance or mention of sibling tools, leaving context implied.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

browse_urlA

Fetch a URL using Obscura's lightweight CDP engine. To access authenticated pages, pass cookies previously exported from browse_cookies.

ParametersJSON Schema
NameRequiredDescriptionDefault
urlYesThe URL to visit
dumpNoThe format to return content inhtml
cookiesNoOptional cookies to inject before navigation. Accepts the same format as returned by browse_cookies — an array of objects with at least name and value. Pass cookies exported from a real browser session to access authenticated pages.
stealthNoAccepted for compatibility. Stealth behavior is controlled by the Obscura server.

TDQS

A4.1/5.0
Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations provided. Description mentions 'lightweight CDP engine' and that stealth behavior is server-controlled, but lacks details on rendering, timeouts, or error handling, leaving significant behavioral aspects unspecified.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, front-loaded with purpose, followed by key guidance. No unnecessary words; every sentence serves a purpose.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

While purpose and authentication context are covered, the absence of output schema and lack of details about behavior (e.g., whether it executes JavaScript, timeouts) mean an agent may need more information to use the tool effectively.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with clear parameter descriptions. The description adds value by contextualizing cookies usage (linking to browse_cookies) and explaining stealth as compatibility, going slightly beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool fetches a URL using Obscura's CDP engine, and it distinguishes from siblings browse_cookies and browse_evaluate by focusing on URL fetching.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly tells when to use cookies for authenticated pages and references browse_cookies as the source, but does not provide guidance on when not to use this tool or alternatives beyond cookies.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 3 tool updatesv0.1.0
    • First observedbrowse_cookies
    • First observedbrowse_evaluate
    • First observedbrowse_url
Deploy Server
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TDQS

A3.8/5.0

Scored across 3 tools

Disambiguation5/5

Each tool serves a distinct purpose: retrieving cookies, executing JavaScript, and fetching a URL. There is no ambiguity between the three operations.

Naming Consistency5/5

All tool names follow the consistent pattern 'browse_<operation>', using snake_case and a common prefix, ensuring predictability.

Tool Count3/5

With only 3 tools, the surface is thin for a browser automation server. It covers basic actions but feels minimal, so it is borderline appropriate.

Completeness3/5

The set covers URL fetching, cookie extraction, and JS execution, but lacks direct interaction tools (e.g., clicking, form filling, waiting). Workarounds are possible via JS, but gaps exist.

Maintenance

ActivityInactive
ResponsivenessNo issues

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