vyne-mcp

MCP (Model Context Protocol) server for vyne — a Zapier-style automation engine for Solana DeFi. Vynes are workflows of typed leaves; on-chain events, cron schedules, webhooks, or manual fires drive multi-step pipelines that execute through a per-user agent wallet bounded by per-vyne signing policies.

• 32 tools covering discovery (find_leaves, get_capabilities, check_supported), authoring (compile_vyne, plant_vyne, test_vyne), ad-hoc reads (query_leaf), and run inspection (get_runs, tail_run) — each with zod input schemas, MCP tool annotations (readOnlyHint/destructiveHint/…), structured errors with actionable next_steps[], and list truncation with continuation hints.

• 11 resources (vyne://wallet, vyne://capabilities, vyne://leaves/{id}, …) for lazy reads that don't burn tool-call slots.

• 10 guided prompts (build_vyne, diagnose_run, fund_wallet, …) encoding the canonical authoring loop so LLM clients follow the same guardrails every time. See PROMPTS.md.

• Output redaction (src/redact.ts) — bot tokens, webhook URLs, and OAuth secrets stored in user workflow configs are masked before they reach the model's context.

Transports

• stdio — for Claude Desktop and other local clients. The API key sits in VYNE_API_KEY for the lifetime of the subprocess: node dist/index.js stdio

• Streamable HTTP — for hosted clients (claude.ai custom connectors). The key arrives as Authorization: Bearer <key> per request; sessions are tracked via Mcp-Session-Id per the MCP spec. Includes RFC 9728 protected resource metadata + OAuth redirect shims so OAuth-aware clients discover the API's authorization server automatically.

Related MCP server: Stacks AI MCP Server

Running

npm install
npm run build

# HTTP transport (default, port 3100)
VYNE_API_URL=<your-api-base-url> npm start

# stdio transport (Claude Desktop)
VYNE_API_URL=<your-api-base-url> VYNE_API_KEY=sk_live_… npm run start:stdio

See .env.example for every knob (toolset filtering, read-only mode, CORS allowlist, logging).

Claude Desktop config

{
  "mcpServers": {
    "vyne": {
      "command": "node",
      "args": ["/path/to/vyne-mcp/dist/index.js", "stdio"],
      "env": {
        "VYNE_API_URL": "<your-api-base-url>",
        "VYNE_API_KEY": "sk_live_…"
      }
    }
  }
}

Scope of this repository

This repo contains the MCP server only. The vyne REST API it talks to — the workflow engine, leaf manifests, compiler/preflight pipeline, signing infrastructure, and curated on-chain address registry — is a separate, closed-source service. Consequently:

• src/vendor/ holds small utilities inlined from internal packages (structured logging, .env loading, token-amount formatting). The client-side token resolver (src/vendor/funding.ts) is trimmed to well-known public mints; authoritative funding math comes from the API (estimate_vyne_funding / preflight_vyne).

• You need access to a running vyne API instance (and an API key or OAuth token issued by it) for the server to do anything useful.

Development

npm run dev        # tsx watch, HTTP transport
npm run typecheck
npm test           # vitest (redaction unit tests)