tau

Serverless functions for coding agents — deploy, invoke, and monitor from one CLI. As easy as git.

git for your code. tau for your functions.

Your agent writes a webhook handler, a cron job, a data transform — then hits a wall: AWS consoles, IAM policies, YAML, a deploy pipeline it can't drive. So you become the middleman, clicking through Lambda screens for code you didn't write. TauFunctions is the serverless platform your agent runs itself: one install, and it creates, deploys, invokes, and monitors its own functions — from the terminal, with plain JSON in and out.

Works with: Claude Code · Cursor · Cline · Windsurf · Aider · Codex · any MCP client

Create to invoked function in 60 seconds — watch the full demo.

Install

npm install -g taufunctions

The npm package is taufunctions; the command is tau.

Quick Start

# Sign up
tau signup you@example.com --tenant my-project

# Create a function from a file
tau fn create "process-order" -r nodejs20 --file handler.js

# Deploy it
tau deploy <function-id>

# Invoke with a JSON payload
tau invoke <function-id> '{"orderId": "ORD-001"}'

# Watch it run
tau logs <function-id>
tau stats <function-id>

# Full reference
tau --help

No consoles, no YAML, no IAM maze

A function on TauFunctions is exactly what your agent already has in its context: a handler file and a runtime. No zip bundles, no execution roles, no API Gateway wiring, no infrastructure-as-code detour just to run 20 lines of JavaScript.

# The whole deploy story:
tau fn create "resize-image" -r nodejs20 --file resize.js
tau deploy $FN
tau invoke $FN '{"url": "https://example.com/photo.jpg", "width": 800}'

Create → deploy → invoke is three commands, and every one returns structured output your agent can parse with --json.

Iterate like you're editing a local file

Shipping v2 doesn't mean a new pipeline run. Push new code at an existing function and redeploy — the function ID, URL, and history stay put.

tau fn code $FN --file hello.js      # swap in the new handler
tau deploy $FN                       # redeploy
tau invoke $FN '{"version": 2}'      # verify

Monitor everything from the terminal

No CloudWatch spelunking. Invocation counts, durations, error rates, and execution logs are one command each — formatted for humans, --json for agents.

tau stats $FN            # invocations, avg duration, error rate
tau logs $FN --tail 20   # recent executions
tau limits               # your plan's quotas and current usage

Runtimes

tau runtimes

Node.js 18/20/22, Python 3.11/3.12, Go 1.21/1.22, Ruby 3.2, and Rust 1.75. Node.js functions execute today on auto-scaling Docker Swarm containers; the remaining runtimes are rolling out on the same executor.

MCP Server

Prefer tools over a CLI? tau ships an MCP server. Point Claude Code (or any MCP client) at it and your agent gets 12 native tools: create, deploy, invoke, update, delete, logs, stats, runtimes, limits, health — the whole function lifecycle.

claude mcp add taufunctions -- tau mcp-serve

For clients that use a JSON config (Cline, Cursor, Windsurf), pass your API key via the TAU_API_KEY environment variable. The MCP server runs outside your project directory, so it will not pick up .tau/config.json:

{
  "mcpServers": {
    "taufunctions": {
      "command": "tau",
      "args": ["mcp-serv

... [View full README on GitHub](https://github.com/jyswee/taufunctions#readme)