HOL Hashnet MCP

Model Context Protocol (MCP) server for Hashgraph Online’s Registry Broker. It gives AI agents a first-class tool suite to discover, register, and chat with agents/servers on the Hashgraph network, plus workflow shortcuts for common journeys.

Why use this server?

• Discovery & chat in one place: Find UAIDs/agents/MCP servers, validate them, open chat sessions, and send messages via a single MCP endpoint.
• Registration flows: Request quotes, submit HCS-11 registrations, and wait for completion with built-in pipelines.
• Ops & credits: Inspect broker health/metrics, and manage credits (HBAR or X402), with guardrails for required approvals.
• DX for agent platforms: Ships both stdio (great for Claude Desktop) and HTTP streaming/SSE (great for Cursor/Claude Code/Codex).

Quickstart

Prereqs: Node 18+, pnpm (or npm), and a broker API key.

You can get a API key at hol.org/regsitry

1. Install deps and env:

pnpm install
cp .env.example .env  # add REGISTRY_BROKER_API_KEY + URL

2. Run (HTTP streaming, default port 3333):

npx @hol-org/hashnet-mcp@latest up --transport sse --port 3333
# or from source: pnpm dev:sse

3. Point your MCP client at http://localhost:3333/mcp/stream (or /mcp/sse if it prefers SSE).

Zero-touch quickstart

pnpm quickstart

Guides you through copying .env, installing deps, running smoke checks, and launching your chosen transport (stdio or sse).

Architecture (mental model)

Client (Cursor / Claude Code / Claude Desktop / Codex)
   │  stdio (dev:stdio) or HTTP stream/SSE (dev:sse)
   ▼
Hashnet MCP (FastMCP)
   ├─ mcp.ts (tools + schemas + instructions)
   ├─ workflows/* (pipelines like discovery, registration, chat)
   └─ broker.ts (RegistryBrokerClient wrapper + rate limits)
   ▼
Hashgraph Online Registry Broker API

MCP client setup

Cursor / Claude Code (HTTP)

{
  "mcpServers": {
    "hashnet-mcp": {
      "enabled": true,
      "type": "http",
      "url": "http://localhost:3333/mcp/stream"
    }
  }
}

Use "type": "sse" if your build expects it.

Claude Desktop (stdio)

{
  "mcpServers": {
    "hashnet": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@hol-org/hashnet-mcp",
        "up"
      ],
      "env": {
        "REGISTRY_BROKER_API_URL": "https://registry.hashgraphonline.com/api/v1",
        "REGISTRY_BROKER_API_KEY": "<your HOL API key>"
      }
    }
  }
}

Commands

• Dev transports: pnpm dev:stdio (stdio), pnpm dev:sse (HTTP stream/SSE)
• Build / prod: pnpm build then pnpm start
• NPX runner: npx @hol-org/hashnet-mcp up --transport sse --port 3333
• Local TS runner: pnpm cli:up -- --transport sse
• Guided DX: pnpm quickstart (env copy → deps → smoke → launch)
• Manual chat smoke: pnpm chat:smoke --uaid <uaid> [--auth-token <token>] [--top-up --account-id <id> --private-key <key>]
• Workflows: pnpm workflow:list, pnpm workflow:run <name> --payload examples/workflows/<file>.json
• Tests: pnpm test --run --coverage

Tooling at a glance

Categories are exposed as MCP tools (hol.*) plus workflows (workflow.*):

• Discovery: hol.search, hol.vectorSearch, hol.registrySearchByNamespace, hol.resolveUaid
• Registration: hol.getRegistrationQuote, hol.registerAgent, hol.waitForRegistrationCompletion, hol.updateAgent
• Chat: hol.chat.createSession (uaid or agentUrl), hol.chat.sendMessage (sessionId or uaid/agentUrl; auto-creates session), hol.chat.history, hol.chat.compact, hol.chat.end, hol.closeUaidConnection; encrypted helpers: hol.chat.ensureEncryptionKey, hol.chat.startEncryptedConversation, hol.chat.acceptEncryptedConversation, hol.chat.sendEncrypted
• Protocols/Ops: hol.listProtocols, hol.detectProtocol, hol.stats, hol.metricsSummary, hol.dashboardStats, hol.websocketStats
• Credits: hol.credits.balance, hol.purchaseCredits.hbar, hol.x402.minimums, hol.x402.buyCredits
• Ledger: hol.ledger.challenge, hol.ledger.authenticate
• Workflows (pipelines): discovery, registration, full registration, chat smoke, encrypted chat, ops check, ERC-8004 and X402 helpers, OpenRouter chat, registry showcase, Agentverse bridge. See examples/workflows/ for payloads.

Usage patterns

• Discovery: workflow.discovery { query?, limit? } or hol.search with filters (capabilities, metadata, type=ai-agents|mcp-servers).
• Registration: workflow.registerMcp { payload } (quote → register → wait) or workflow.fullRegistration to add discovery/chat/ops.
• Chat: Start with hol.chat.sendMessage { uaid, message } if you don’t have a sessionId— it will create a session and send. Otherwise use hol.chat.createSession then hol.chat.sendMessage { sessionId, message }. Manage with hol.chat.history/compact/end. For end-to-end encrypted sessions, run workflow.encryptedChat or the hol.chat.start/accept/sendEncrypted trio after calling hol.chat.ensureEncryptionKey.
• Ops/Health: workflow.opsCheck or the hol.stats/hol.metricsSummary/hol.dashboardStats trio.
• Credits: Always check hol.credits.balance before purchasing; use HBAR or X402 tools with explicit approval.
• Memory: When MEMORY_ENABLED=1, workflows (chatSmoke, openrouterChat, historyTopUp, registryBrokerShowcase, fullRegistration) will load scoped context and append chat/discovery traces; pass disableMemory: true to skip.

Memory (how it works)

• Enable with MEMORY_ENABLED=1 (defaults to a file-backed store at MEMORY_STORAGE_PATH; use MEMORY_STORE=memory for in-memory only, or MEMORY_STORE=sqlite if you want SQLite and have native build tools installed). Tune MEMORY_MAX_ENTRIES_PER_SCOPE, MEMORY_DEFAULT_TTL_SECONDS, MEMORY_SUMMARY_TRIGGER, MEMORY_MAX_RETURN_ENTRIES, and MEMORY_CAPTURE_TOOLS.
• MCP tools: hol.memory.context, hol.memory.note, hol.memory.search, hol.memory.clear (see help://hol/memory). Scopes use uaid, sessionId, namespace, or userId.
• Automatic capture: hol.chat.sendMessage logs user/assistant exchanges; tool wrapper can log tool calls/results when MEMORY_CAPTURE_TOOLS=1.
• Workflows: chatSmoke, openrouterChat, historyTopUp, registryBrokerShowcase, and fullRegistration load prior context and append transcripts/results when memory is enabled. Add disableMemory: true in workflow inputs to opt out.
• Guardrails: entries are truncated to stay within size budgets, secrets are redacted, TTL + max-entries bounds keep storage from growing unbounded. Summaries are generated heuristically once thresholds are exceeded.

Tool catalog (what each does)

Discovery

• hol.search — keyword discovery with filters (capabilities, metadata, type).
• hol.vectorSearch — semantic similarity search for agents.
• hol.registrySearchByNamespace — search within a specific registry.
• hol.resolveUaid — resolve + validate + connection status for a UAID.
• hol.closeUaidConnection — force-close a UAID connection.

Registration

• hol.getRegistrationQuote — cost estimate for a registration payload.
• hol.registerAgent — submit HCS-11 registration.
• hol.waitForRegistrationCompletion — poll registration attempt until done.
• hol.updateAgent — update an existing registration payload.
• hol.additionalRegistries — catalog of additional registries/networks.

Chat

• hol.chat.createSession — open a session by uaid or agentUrl.
• hol.chat.sendMessage — send to an existing sessionId or auto-create via uaid/agentUrl.
• hol.chat.history / hol.chat.compact / hol.chat.end — manage chat lifecycle.
• Encrypted helpers: hol.chat.ensureEncryptionKey, hol.chat.startEncryptedConversation, hol.chat.acceptEncryptedConversation, hol.chat.sendEncrypted (encrypt/decrypt via broker-managed keys).

Protocols / Ops

• hol.stats, hol.metricsSummary, hol.dashboardStats, hol.websocketStats — broker health/metrics.

Credits

• hol.credits.balance — check balances (API key + optional Hedera/X402).
• hol.purchaseCredits.hbar — buy credits with HBAR.
• hol.x402.minimums, hol.x402.buyCredits — X402 purchase helpers.

Ledger

• hol.ledger.challenge — create ledger verification challenge.
• hol.ledger.authenticate — verify challenge (sets ledger API key).

Workflows (pipelines)

• Discovery: workflow.discovery, workflow.erc8004Discovery
• Registration: workflow.registerMcp, workflow.fullRegistration, workflow.erc8004X402, workflow.x402Registration, workflow.registerAgentErc8004
• Chat/Ops: workflow.chatSmoke, workflow.encryptedChat, workflow.opsCheck, workflow.registryBrokerShowcase, workflow.openrouterChat, workflow.agentverseBridge
• Utilities: see examples/workflows/ for payloads and pnpm workflow:list

Environment

Set in .env or your process:

• REGISTRY_BROKER_API_URL (default https://registry.hashgraphonline.com/api/v1)
• REGISTRY_BROKER_API_KEY (required for live broker)
• Optional: HEDERA_ACCOUNT_ID, HEDERA_PRIVATE_KEY (auto top-up), LOG_LEVEL, PORT, HTTP_STREAM_PORT, BROKER_* rate limit vars, WORKFLOW_DRY_RUN, BROKER_AUTO_TOP_UP.
• Encrypted chat defaults: ENCRYPTED_CHAT_KEY_LABEL, ENCRYPTED_CHAT_PREFERENCE (preferred|required|disabled), ENCRYPTED_CHAT_AUTO_DECRYPT (1/0), plus history tuning knobs HISTORY_COMPACTION_TOP_UP_HBAR, CHAT_HISTORY_TTL_SECONDS.
• Memory (optional): set MEMORY_ENABLED=1 to enable local storage (defaults to file-backed JSON at MEMORY_STORAGE_PATH; use MEMORY_STORE=memory for in-memory only, or MEMORY_STORE=sqlite if you want SQLite with native deps). Tune MEMORY_MAX_ENTRIES_PER_SCOPE, MEMORY_DEFAULT_TTL_SECONDS, and MEMORY_SUMMARY_TRIGGER. See help://hol/memory for the hol.memory.* tools.

Testing & quality

• Run once with coverage: pnpm test --run --coverage
• Tool E2E (real broker): pnpm test:tools (set test UAIDs or rely on discovery)
• Tool E2E (mock): pnpm test:tools:mock

Deploy

• Builds to dist/ via tsup. Prod entry: dist/index.js, CLI bin: dist/cli/up.js.
• Deploy docs for Fly/Cloud Run under deploy/. Health probe at /healthz.

Logging & observability

• pino structured logs; set LOG_LEVEL=fatal|error|warn|info|debug|trace.
• Each tool call logs requestId + duration. SSE/HTTP transport logs requests. Credits/registration calls surface broker status/body on failure.