CAIN-42 · Secure tools & MCP servers

CAIN Skills

A catalog of the skills your agents may use, each one reviewed and governed.

Last reviewed 2026-10-01

Live   Core platform · agent

What it is

Agent skill management and marketplace.

Where it fits

Part of Secure tools & MCP servers: Check, pin and gate the tools your agents can reach. Every CAIN-42 product runs behind the same rule: an AI agent's action is checked before it runs (identity, authority, policy, risk), decided as allow, hold for a human, or block, and recorded as signed evidence. Unknown or error never becomes allow.

Use it

• Open it https://cainstudio.online/skills
• API endpoint: https://cainstudio.online/fabric/skills — needs your API key (get a free key)

Recorded status: PRODUCTION. "Live" on this page means its link answered when the catalog was last checked (2026-10-01T18:22 UTC).

Live now

Checked from your browser when this page opened, not from a cached list.

Fire a real decision

Send an action through the live CAIN-42 pipeline from this page, with no account, and watch every stage decide. This is the same pipeline every product here sits behind; it runs for a throwaway demo tenant and is rate limited.

For AI engineers

Every product sits behind one decision path: your agent proposes an action with the exact arguments, CAIN runs it through identity, authority, policy, risk, trust and quorum consensus, and answers ALLOW, REQUIRE_APPROVAL or DENY with an Ed25519-signed record. A timeout, outage or unknown verdict never becomes ALLOW. A brand-new agent has no trust history, so its first actions usually come back REQUIRE_APPROVAL.

Python (zero dependencies)

pip install https://cainstudio.online/cainstudio-0.3.0-py3-none-any.whl
export CAIN_API_KEY=...   # free key: https://cainstudio.online/signup

import cainstudio

@cainstudio.guard()
def transfer(amount_usd: float, to: str) -> str:
    ...  # runs only if CAIN allows this call, with these arguments

try:
    transfer(5000, "acme")
except cainstudio.ApprovalRequired as e:
    print("held for a human:", e.approval_id)
except cainstudio.ActionBlocked as e:
    print("refused:", e.decision.reasons)
except cainstudio.CainUnavailable:
    print("CAIN unreachable: not run")   # fail-closed

See a real decision with no account

cainstudio try          # live pipeline, stage by stage
cainstudio try --list   # the other attack scenarios

MCP clients (Claude Code, Cursor)

claude mcp add --transport http cain https://cainstudio.online/mcp

More: Python SDK · TypeScript SDK · framework integrations · AI quickstart · decision signing key

Tested guarantees in this area

Every rule in these niches has its own page with its recorded result.

• Tools, MCP, protocols & adapters: 684 tested invariants — How agents reach tools, APIs and each other, safely.
• Supply chain, registry & lifecycle: 246 tested invariants — Where agents, models and tools come from, and how they change.

Related

• Chat — Chat with the MCPGate tools from your browser.
• DriftGuard — Pins your MCP tool definitions and alerts you if one is silently changed.
• Flowgate — Checks an agent pipeline for loops and bad ordering before it runs.
• MCP Protocol Explorer — Browse and call MCP tools interactively to see how they behave.
• MCP Security Scanner — Scans MCP tools for hidden instructions, leaked keys and dangerous parameters.
• MCPGate — The gate in front of your tools: an agent touches a tool only when CAIN says yes.
• MCPiverse — Turns any API description into a signed MCP server your agents can use.
• MeshRouter — Routes each agent request to the right service, with rate limits and circuit breakers.
• ToolWarden — Runs MCP tools in a sandbox with size limits and injection screening.