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dev.workers.3labsio.policy-gate/policy-gate

by policy-gate.3labsio.workers.dev · remote · no sign-in to list tools · v0.2.0 · published by dev.workers.3labsio.policy-gate

Deterministic allow/require_approval/deny verdicts for agent actions, before they happen.

Final · 1Changes · 3
CompareRegistry entry

4 tools: 1 do something that can't be undone and 3 change things.

Scanned Oct 21, 2026

No check matched anything in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http policy-gate https://policy-gate.3labsio.workers.dev/mcp

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

4 tools

Can't be undone 1Claude Code: ask
  • first_42_sponsorPay Fieldproof $42.No findings

    Why it is in this group

    • The description's first verb is "pay": a word that usually means money moves, which cannot be taken back.
    Description, as the server wrote it
    Pay Fieldproof $42. Returns every live rail: Stripe card_uri, EIP-681 usdc_uri, BIP-21 btc_uri, x402 POST /v1/sponsor, Zelle, and GET /v1/invoice. One settlement meets the first-$42 bar.
Changes things 3Claude Code: ask
  • policy_checkEvaluate a proposed agent action against a policy and return allow / require_approval / deny with the matched rule and rationale.No findings

    Why it is in this group

    • The description's first verb is "evaluate": a word for a change.
    Description, as the server wrote it
    Evaluate a proposed agent action against a policy and return allow / require_approval / deny with the matched rule and rationale. Paid per call via x402 ($0.005 USDC on Base); returns signing instructions when unpaid.
  • policy_exampleFree.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Free. Worked allow/require_approval/deny verdicts from the live policy engine, so you can judge the service before paying for it.
  • policy_rulesFree.No findings

    Why it is in this group

    • Nothing in its name or description says what it does, so it is counted as a write.
    Description, as the server wrote it
    Free. The full built-in policy: every tier, rule, condition and rationale. Nothing about how a verdict is reached is hidden.

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 0.2.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http policy-gate https://policy-gate.3labsio.workers.dev/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [],
    "ask": [
      "mcp__policy-gate__policy_example",
      "mcp__policy-gate__policy_rules",
      "mcp__policy-gate__policy_check",
      "mcp__policy-gate__first_42_sponsor"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as policy-gate. Review it before you use it.