MCP server agent-tools

mcpserver — agent-tools.cloud directory + MCP discovery

The server that powers agent-tools.cloud — an open, agent-readable directory of x402 paid APIs, MCP servers and A2A agents, probed daily, graded and safety-scanned, with a free MCP discovery endpoint and an A2A agent. Everything on the site (listings, daily statistics, scoring methodology, Blog) is available as JSON and through MCP tools. Also listed on Smithery.

Branches: main is an older public snapshot. The code that runs the site today, including everything described below, is on the directory-site branch.

Note (2026-05-25): the previously hosted paid Qwen3.6 relay and the paid vertical endpoints (signal / onchain / defi / portfolio) were retired after 30 days of zero external conversions. This repository now serves the directory site and the free MCP discovery server only.

What this serves today

Path	Auth	Purpose
GET / (host = agent-tools.cloud)	free	Directory site (search / browse)
GET /api/v1/search	free	Faceted service search
POST /api/v1/ask	free, rate-limited	LLM-ranked recommendations grounded in directory candidates
GET /api/v1/services/{slug}	free	Service card with payment, call and quality metadata
GET /api/v1/categories, /api/v1/stats	free	Directory facets and aggregate stats
GET /stats, /stats.json, /stats/daily.csv	free	Daily ecosystem statistics page, full snapshot and history (CC BY 4.0)
GET /api/v1/stats/summary?view=all|mcp|x402|a2a	free	Compact daily digest for agents
GET /api/v1/methodology	free	How quality grades, readiness scores and statistics are computed
GET /api/v1/blog, /api/v1/blog/{slug}	free	Published Blog articles (list; full Markdown)
GET /llms.txt	free	Plain-text guide for LLM agents
POST /api/v1/submit	free, rate-limited	Pending service submission with dedupe
POST /api/v1/keys	free	Mint an API key (no signup) for account-scoped actions
POST /api/v1/services/{slug}/paid-verifications	API key	Sponsored paid verification: quote, then /api/v1/paid-verifications/{id}/execute
POST /mcp-discovery/	free	MCP streamable-http discovery server
POST /a2a	free	A2A JSON-RPC agent (0.3 message/send and 1.0 SendMessage): directory search, MCP safety scan, daily statistics
GET /healthz	free	Liveness
GET /v1/models	free	Upstream model listing (read-only)
GET /.well-known/agent-tools.json	free	Agent discovery manifest
GET /.well-known/x402	free	x402 v0.4 self-description (free-only)
GET /.well-known/mcp.json	free	MCP self-description

The MCP discovery server is also published as a standalone PyPI package: agent-tools-mcp (repo).

MCP discovery tools

search(intent, top_k=5, category=None, max_price_usd=None, has_mcp=None)
ask_services(intent, top_k=5, category=None, max_price_usd=None, use_llm=True)
get(slug)
list_categories()
stats()
directory_stats(view="all")
get_methodology()
list_articles(query="", tag="", page=1)
get_article(slug)
search_mcp_servers(intent, top_k=5, chain=None, require_healthy=False)
get_mcp_server(slug)
search_a2a_agents(intent, top_k=5, x402_only=False)
search_resources(intent, protocol=None, top_k=10)
scan_mcp_safety(endpoint_url, name="", description="", tools_text="")
register(url, name=None, description=None, mcp_url=None, category=None)
prepare_paid_verification(slug, payer, api_key=None)
execute_paid_verification(id, signature, api_key=None)
get_paid_verification(id, api_key=None)
claim_service_url(url, method=None)
verify_service_url(claim_id, token)
get_owned_listing(kind, slug)
edit_owned_listing(kind, slug, fields)

*_paid_verification (remote server only, not in the agent-tools-mcp package): pay a listed x402 service once from your own wallet and record the result. Needs an API key from POST /api/v1/keys. See /about#paid-verification.

search accepts natural-language intent and ranks by FTS5 + popularity + health. Each result carries a match_reason and a confidence score. ask_services uses the same retrieval-first / LLM-rerank flow as /api/v1/ask.

scan_mcp_safety vets an MCP server (by endpoint URL) for malware / prompt-injection lures before you connect: an already-indexed server returns our latest stored verdict, an unknown one is probed live, scanned, and added to the directory if it answered or you supplied metadata (documentation hosts such as example.com, *.test, *.invalid are scanned but never listed). The verdict comes from deterministic static rules (no code execution) over the server's advertised name + description + tool docs. Rules cover pipe-to-shell / base64-eval / PowerShell install cradles, bare-IP payload hosts, prompt-injection phrasing, and MCP tool-poisoning coercion — "always call this tool first", "before using any other tool you must…", hidden <IMPORTANT> instructions, "list all API keys / include secrets in your response", and coercion to read & forward .key/.pem/.ssh/.env files. Source-code-oriented rules (SQL/command/code injection) are intentionally not applied to natural-language descriptions to avoid false positives. Each live call also runs a frontier-LLM second opinion as an advisory dimension. It is also exposed as an A2A skill on POST /a2a. The hosted server carries the full tool set above; the stdio agent-tools-mcp PyPI package ships the core search tools only.

Deploy

Runs behind nginx as a systemd service (see deploy/).

cd <install-dir>
sudo git pull
sudo systemctl restart mcpserver

systemd units live in deploy/:

• mcpserver.service — the ASGI app (uvicorn, 127.0.0.1:9100)
• mcpserver-b.service — second instance on 127.0.0.1:9101; nginx upstream agent_tools_app uses both, so deploy with agent-tools-rolling-restart instead of systemctl restart mcpserver
• agent-tools-crawl.{service,timer} — daily directory crawler at 00:30
• agent-tools-health.{service,timer} — daily endpoint health checks at 05:30

Config

See .env.example. Required:

• UPSTREAM_BASE_URL / UPSTREAM_API_KEY — used by /v1/models
• AGENT_TOOLS_ASK_BASE_URL / AGENT_TOOLS_ASK_API_KEY / AGENT_TOOLS_ASK_MODEL — LLM backend for /api/v1/ask
• AGENT_TOOLS_SAFETY_BASE_URL / AGENT_TOOLS_SAFETY_API_KEY / AGENT_TOOLS_SAFETY_MODEL — optional override for the scan_mcp_safety advisory LLM (falls back to the AGENT_TOOLS_ASK_* backend)
• AGENT_TOOLS_DB_PATH — SQLite path for the directory
• AGENT_TOOLS_ASK_RATE_LIMIT_PER_MINUTE / AGENT_TOOLS_ASK_RATE_LIMIT_PER_DAY — public ask abuse limits
• METRICS_BEARER_TOKEN — optional remote access token for /metrics; without it metrics are local-only

Articles (optional)

Disabled by default. ARTICLES_ENABLED=1 enables /articles (list, detail, RSS, Markdown mirror), the author workspace /account/articles and editor review /admin/articles. Articles live in a separate SQLite file (ARTICLE_DB_PATH, default articles.db next to the main database); back it up with the SQLite backup API so the WAL is not lost.

• Authors must hold at least one verified listing claim. The REST API (/api/v1/articles, /save, /submit, /cancel-submission, /preview, /media) accepts only Authorization: Bearer <api_key>.
• Every submission is reviewed; only accounts in ARTICLE_EDITOR_IDS can publish. Public pages read the published version only.
• Toolbar icons come from lucide-static 1.70.0 (licence kept in directory/article_assets/LICENSE).

Sponsored publication (optional)

Paid sponsored posts use a NOWPayments hosted invoice plus a signed IPN (HMAC-SHA512 over the sorted JSON body). The private JSON config is read from NOWPAYMENTS_ARTICLES_CONFIG (default /etc/agent-tools/nowpayments-articles.json, keep it mode 0600). Order, pricing and IPN endpoints return 404 unless the config is complete and sponsored_articles_enabled is true. Sponsored posts carry a visible "Sponsored" disclosure and their links get rel="sponsored"; payment never changes directory ranking.

Smoke test

# Liveness
curl https://agent-tools.cloud/healthz

# Directory stats
curl https://agent-tools.cloud/api/v1/stats

# Intent-level service recommendation
curl -s -X POST https://agent-tools.cloud/api/v1/ask \
  -H 'content-type: application/json' \
  -d '{"query":"find a weather API that accepts x402","limit":2}'

# Service card
curl https://agent-tools.cloud/api/v1/services/weather-hugen-tokyo-scan

# MCP discovery handshake
curl -s -X POST https://agent-tools.cloud/mcp-discovery/ \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize",
       "params":{"protocolVersion":"2025-06-18","capabilities":{},
                 "clientInfo":{"name":"smoke","version":"1"}}}'

# Retired paid path -> 404
curl -s -o /dev/null -w '%{http_code}\n' -X POST \
  https://agent-tools.cloud/v1/chat/completions \
  -H 'content-type: application/json' \
  -d '{"model":"Qwen/Qwen3.6-35B-A3B","messages":[{"role":"user","content":"hi"}]}'
# => 404

License

The agent-tools.cloud server and directory code in this repository is licensed under the PolyForm Noncommercial License 1.0.0 — you may use, modify, and share it for any noncommercial purpose; commercial use is not permitted.

The standalone MCP client package in agent-tools-mcp/ (published to PyPI as agent-tools-mcp) is licensed separately under Apache-2.0, so any agent — including commercial ones — can install and call the hosted service freely.

Using the hosted service at agent-tools.cloud is governed by its terms of service, not this code license.