Argus MCP Server

Argus

Multi-provider web search broker for AI agents. Routes across SearXNG, DuckDuckGo, GitHub, Brave, Tavily, Exa, and more — using RRF fusion, content extraction, and budget-aware routing so you don't waste your free search credits.

Features at a glance:

• Multi-provider search — 11 providers, one API, free-first tier routing
• 5,000+ free queries/month — automatic budget tracking, exhausted providers skipped
• Content extraction — 9-step fallback chain with quality gates (local + external)
• Multi-turn sessions — pass session_id for conversational search refinement
• 4 search modes — discovery, research, recovery, grounding
• Dead URL recovery — first-class /recover-url endpoint with archive fallbacks
• 4 integration paths — HTTP API, CLI, MCP server, Python SDK

Built for AI agent builders, RAG infra, and ops teams who don't want to hand-wire search APIs.

Contents

• Quickstart
• Providers
• HTTP API
• Integration
  • CLI
  • MCP
  • Python
• Content Extraction
• Architecture
• Configuration
• FAQ

Quickstart

Mode 1: Local CLI (zero config)

pip install argus-search && argus search -q "python web frameworks"

That's it. DuckDuckGo handles the search — no accounts, no keys, no containers. You get unlimited free search from your laptop right now. Add API keys whenever you want more providers, or don't.

argus extract -u "https://example.com/article"       # extract clean text from any URL

Works on any machine with Python 3.11+ — laptop, Mac Mini, Raspberry Pi, cloud VM. Nothing to host.

For MCP (Claude Code, Cursor, VS Code):

pipx install argus-search[mcp] && argus mcp serve

Then add to your MCP config:

{"mcpServers": {"argus": {"command": "argus", "args": ["mcp", "serve"]}}}

Or install from the MCP Registry:

{
  "mcpServers": {
    "argus": {
      "registryType": "pypi",
      "identifier": "argus-search",
      "runtimeHint": "uvx"
    }
  }
}

One command to install, one JSON block to connect. No server to run, no keys to configure.

Mode 2: Full Stack Server

Got a Raspberry Pi running Pi-hole? A Mac Mini on your desk? An old laptop? That's enough to run the full stack — SearXNG (your own private search engine) plus local JS-rendering content extraction.

docker compose up -d    # SearXNG + Argus

SearXNG takes 512MB of RAM and gives you a private Google-style search engine that nobody can rate-limit, block, or charge for. It runs alongside Pi-hole on hardware millions of people already own.

Providers

5,000 free queries/month from the four recurring providers. Three providers need no API key at all. Routing priority: Tier 0 (free: SearXNG, DuckDuckGo, GitHub) → Tier 1 (monthly: Brave, Tavily, Exa, Linkup) → Tier 2 (one-time: Serper, Parallel, You.com, Valyu, SearchAPI). Budget-exhausted providers are skipped automatically.

HTTP API

All endpoints prefixed with /api. OpenAPI docs at http://localhost:8000/docs.

# Search
curl -X POST http://localhost:8000/api/search \
  -H "Content-Type: application/json" \
  -d '{"query": "python web frameworks", "mode": "discovery", "max_results": 5}'

# Multi-turn search (conversational refinement)
curl -X POST http://localhost:8000/api/search \
  -H "Content-Type: application/json" \
  -d '{"query": "what about async?", "session_id": "my-session"}'

# Extract content from a working URL
curl -X POST http://localhost:8000/api/extract \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com/article"}'

# Recover a dead or moved URL
curl -X POST http://localhost:8000/api/recover-url \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com/old-page", "title": "Example Article"}'

# Health & budgets
curl http://localhost:8000/api/health/detail
curl http://localhost:8000/api/budgets

Search modes

Tier-based routing always applies first. Within each tier, the mode selects provider order.

Response format

{
  "query": "python web frameworks",
  "mode": "discovery",
  "results": [
    {"url": "https://fastapi.tiangolo.com", "title": "FastAPI", "snippet": "Modern Python web framework", "score": 0.942}
  ],
  "total_results": 1,
  "cached": false,
  "traces": [
    {"provider": "duckduckgo", "status": "success", "results_count": 5, "latency_ms": 312}
  ]
}

Each result includes url, title, snippet, domain, provider, and score. The traces array shows which providers were called and their outcomes.

Budgets

{
  "budgets": {
    "brave": {"remaining": 1847, "monthly_usage": 153, "usage_count": 153, "exhausted": false},
    "duckduckgo": {"remaining": 0, "monthly_usage": 0, "usage_count": 42, "exhausted": false}
  },
  "token_balances": {"jina": 9833638}
}

Each provider tracks usage per calendar month. When a provider hits its budget, Argus skips it and moves to the next tier. Free providers (SearXNG, DuckDuckGo, GitHub) have no limit. Set ARGUS_*_MONTHLY_BUDGET_USD to enforce custom limits per provider.

Integration

CLI

argus search -q "python web framework"              # zero-config, uses DuckDuckGo
argus search -q "python web framework" --mode research -n 20
argus search -q "fastapi" --session my-session       # multi-turn context
argus extract -u "https://example.com/article"       # extract clean text
argus extract -u "https://example.com/article" -d nytimes.com  # auth extraction
argus recover-url -u "https://dead.link" -t "Title"
argus health                                         # provider status
argus budgets                                        # budget + token balances
argus set-balance -s jina -b 9833638                 # track token balance
argus test-provider -p brave                         # smoke-test a provider
argus serve                                          # start API server
argus mcp serve                                      # start MCP server

All commands support --json for structured output.

Pass session_id to any search call. Argus stores each query and extracted URL in a SQLite-backed session. Reusing the same session_id gives the broker context from prior queries — follow-up searches are automatically refined using earlier conversation context. Sessions persist across restarts. Omit session_id for stateless, one-shot searches.

MCP

Add to your MCP client config:

{
  "mcpServers": {
    "argus": {
      "command": "argus",
      "args": ["mcp", "serve"]
    }
  }
}

Works with Claude Code, Cursor, VS Code, and any MCP-compatible client. For remote access via SSE:

{
  "mcpServers": {
    "argus": {
      "command": "argus",
      "args": ["mcp", "serve", "--transport", "sse", "--host", "127.0.0.1", "--port", "8001"]
    }
  }
}

Available tools: search_web, extract_content, recover_url, expand_links, search_health, search_budgets, test_provider, cookie_health, valyu_answer

Python

from argus.broker.router import create_broker
from argus.models import SearchQuery, SearchMode
from argus.extraction import extract_url

broker = create_broker()

response = await broker.search(
    SearchQuery(query="python web frameworks", mode=SearchMode.DISCOVERY, max_results=10)
)
for r in response.results:
    print(f"{r.title}: {r.url} (score: {r.score:.3f})")

content = await extract_url(response.results[0].url)
print(content.title)
print(content.text)

Content Extraction

Argus tries up to nine methods to extract content from any URL: first local (trafilatura, Crawl4AI, Playwright), then external APIs (Jina, Valyu Contents, Firecrawl, You.com, Wayback, archive.is). Each attempt is quality-checked for garbage output. See docs/providers.md for the full extractor comparison.

Extract gets the full text of a working URL. Recover-URL finds alternatives when a URL is dead, paywalled, or radically changed by querying archival sources (Wayback, archive.is) and running a question-guided extraction loop.

Architecture

Caller (CLI/HTTP/MCP/Python) → SearchBroker → tier-sorted providers → RRF ranking → response
                                     ↕ SessionStore (optional)
                            Extractor (on demand) → 9-step fallback chain with quality gates

Add new providers or extractors with a single adapter file. See CONTRIBUTING.md for the interface.

Configuration

All config via environment variables. See .env.example for the full list. Missing keys degrade gracefully — providers are skipped, not errors.

FAQ

How is this different from calling Tavily/Serper directly? Argus calls them for you — plus 9 other providers. You get one ranked, deduplicated result set instead of managing multiple API keys and stitching results together. Free providers are tried first, so you only burn credits when needed.

Can I run only one provider? Yes. Set only the API key for the provider you want. All others are silently skipped. For zero-config, just install and go — DuckDuckGo handles everything with no keys.

Do I need Docker? No. pip install argus-search works immediately on any machine with Python 3.11+. Docker is only needed for SearXNG (self-hosted search) or Crawl4AI (local JS rendering).

License

MIT — see CHANGELOG.md for release history.