Rainfall DevKit

About the startup

Rainfall DevKit is the last SDK you’ll need to give your AI agents real superpowers. With 200+ production-grade tools accessible through a single API key. Built for developers shipping RAG pipelines, multi-agent orchestration, financial analysis, knowledge graphs, browser automation, and agentic SaaS products. Stop gluing together 17 different APIs with brittle scripts. Rainfall gives you one typed TypeScript interface to everything: web research, document intelligence, embeddings, vector search, knowledge graphs, browser DevTools, code execution, billing, and integrations across GitHub, Notion, Linear, Slack, Figma, and Stripe. Why builders choose Rainfall over alternatives: Unlike personal assistant runtimes or visual workflow builders, Rainfall is infrastructure you embed directly into your product. You bring your own model and interface, Rainfall handles the tool layer. It is not a chatbot framework or a no-code automation platform. It is the 200+ tool library you hand to your agent so it can actually build and operate software. RAG & Knowledge Infrastructure, Production-grade out of the box: Semantic chunking with Jina text segmentation, instant embeddings for documents and queries, relevance reranking, vector similarity search via DuckDB, persistent semantic memory with recall, and a full knowledge graph stack with entity memorization and graph-walk retrieval. Build retrieval-augmented generation pipelines that actually work, not just session logs pretending to be memory. Browser Automation - Chrome DevTools as a service: The full Chrome DevTools Protocol exposed as an MCP server, not just "open a browser and click things." Navigate pages, take screenshots and DOM snapshots, interact with elements, record network requests, run Lighthouse audits, capture performance traces, take memory snapshots, emulate devices and network conditions, and execute custom JavaScript. Debug-grade browser automation built for agents that need to understand, not just interact. Financial & Data Tools - No one else has this: Real-time stock quotes with 60+ financial metrics via Finviz. SEC filing retrieval and XBRL parsing for 10-Qs and 10-Ks. Monte Carlo simulations for portfolio risk modeling. SQL-over-CSV with DuckDB. Document format conversion powered by Pandoc (PDF, DOCX, HTML, LaTeX, and more). CSV and spreadsheet conversion. Structured JSON extraction from unstructured text. Regex matching and PII-safe redaction. AI & Media Processing: Image generation, Llama 4 Scout vision model for image understanding and OCR, Mistral-powered text extraction from PDFs and images, document classification, and a customizable inference agent for reasoning tasks. Plus an OpenAI-compatible chat completions endpoint, use any model you want, we don't gatekeep providers. Integrations - The SaaS builder stack: Native API access to GitHub (issues, PRs, branches, comments), Notion (pages, databases, blocks), Linear (issues, teams), Slack (messages, channels), Figma (files, nodes, images), and the full Stripe billing lifecycle (customers, payment intents, subscriptions, payment methods). No local CLI dependencies. Structured TypeScript methods, not wrappers you have to configure. Distributed Execution & Security: Daemon context with local WebSocket MCP server and OpenAI-compatible proxy. Networked executor for distributed job queuing across machines. Secure edge nodes with JWT authentication, encrypted payloads via libsodium, and ACL checks. File-watcher workflows and cron triggers for event-driven agent orchestration. Sandboxed script execution supporting JavaScript, Python, TypeScript, Bash, and SQL. MCP Support - Works with your existing tools: First-class Model Context Protocol support for Claude Desktop, Cursor, Windsurf, and any MCP-compatible client. MCP Proxy Hub connects external MCP servers into your Rainfall workflow seamlessly. Content & Research: Full article knowledge base, search, create, fetch, and summarize with configurable length. Topic extraction, relevant news discovery, and URL-to-article conversion. Exa and Perplexity-powered web research built in. Developer Experience: Full TypeScript with auto-generated types, automatic retries with exponential backoff, clear error types (RateLimitError, AuthenticationError, etc.), comprehensive CLI, and three import surfaces, core SDK, MCP server, and daemon. Pricing: Indie Tier starts at $9/month with 60 requests per minute and usage credits. Built by developers who use it daily to run their own company, if something breaks, it gets fixed fast.