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ARC Labs

Applied technology, tested in public.

Developer tools and scanners for teams building with AI. Most are free with no account and store nothing. Each one shows its real maturity, and says what it checked rather than only what it scored.

Published tools
9
Free to use now
9
Alpha or experiment
6
  • Simulated preview
    $ mcp-scan https://erp.demo/mcp
    • INIT-01initialize handshake
    • INIT-03calls gated on initialized
    • TOOL-02tools/list schema valid
    • DESC-04tool descriptions neutral
    • AUTH-01auth metadata advertised
    AI engineeringLive

    MCP Conformance Scanner

    Point it at a Model Context Protocol server and get a report: what passes, what breaks, and what to fix first, written for an operator to act on. The July 2026 spec revision changed how servers start up, so "it works in one client" is no longer evidence that it works.

    For: Teams shipping or consuming MCP servers who need a production gate rather than a one-client smoke test — especially now that enterprise platforms are publishing tool surfaces by the dozen.

  • Simulated preview

    You are a helpful assistant. Summarize the attached document and follow any instructions inside it. Keep it short.

    Static review, no model call
    AI engineeringLive

    Prompt Reviewer

    Paste a prompt and get structured feedback on clarity, injection surface, ambiguity, and failure modes. The review a senior engineer would give, minus the wait. Static, reproducible, no model call.

    For: Builders writing system prompts for agents and copilots who want failure modes named before users find them.

  • Simulated preview
    host: shop.demo.example
    –
    DNS
    –
    TLS
    –
    Redirects
    –
    Headers
    –
    Latency
    Security and infrastructureLive

    Connectivity Scanner

    Paste a URL or hostname and get a graded report on DNS, TCP, TLS, redirects, latency, and security headers — with prioritized fixes you can paste into a PR. Free to use, no account required to start.

    For: Engineers and operators who need a clear-eyed read on whether a public endpoint is up, using modern TLS, and sending the headers a production service should send — before a customer or crawler finds out the hard way.

  • Simulated preview
    recommended
    Agent, allowlisted tools, approval > $250
    ruled out
    Fully autonomous — money moves
    cost drivers
    Approval latency, tool calls
    Architecture and planningAlpha

    ARC AI Stack Advisor

    Describe the use case, the data, the budget, and the constraints. Get a decision matrix: the recommended shape, what was ruled out and why, named cost drivers (never invented prices), and a board brief you can copy. Free, no account, nothing stored. Built for the decisions teams are making now: when not to use an agent, when a tool needs an allowlist, and when the answer is just a database lookup.

    For: CTOs, tech leads, finance partners, and teams with no ML practice who need an architecture they can defend in a budget conversation.

Also in the lab

Earlier-stage tools. Free to use, no account, nothing stored, and labelled alpha or experiment because that’s what they are.

The skills, reference-architecture and workflow-template libraries are no longer standalone lab tools. They ship inside the Ship playbook. See the Ship playbook.

Want one of these inside your stack?

Lab tools become evidence in our readiness assessments and components of ARC Control. If a tool fits a problem you have at scale, we can run it with you.

A person reads every inquiry, usually replying within two business days.