GateCheck by LarryBuildsAI

by LarryLemonBot · remote · no sign-in to list tools · v0.1.3 · published by GitHub user LarryLemonBot

One-cent x402 and MCP readiness checks plus fixed-price marketplace launch packs.

Changes · 51 high finding

Compare Registry entry

6 tools: 5 change things and 1 only read.

Scanned Oct 21, 2026

Deletes or cancels0Claude Code: deny
Can't be undone0Claude Code: ask
Changes things5Claude Code: ask: see these tools
Only reads1Claude Code: allow: see these tools

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

claude mcp add --transport http gatecheck https://proofbeforepay.vercel.app/gatecheck/mcp

Findings

Matches of fixed checks, with the text they matched.

1 high3 warn1 info

Highcheck_agent_tool_readiness
The description refers to "/.well-known/mcp.json".
Matched text
description: "...overy surfaces (/llms.txt, /agents.txt, /.well-known/mcp.json, /mcp). Pass target plus optional tier,..."
What this check looks for
Warnboundary_guard_check
The server marks "boundary_guard_check" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "create": a word for a change.
What this check looks for
Warngenerate_x402_launch_pack
The server marks "generate_x402_launch_pack" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "generate_x402_launch_pack" says "generate": a word for a change.
What this check looks for
Warngenerate_trust_receipt
The server marks "generate_trust_receipt" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "generate_trust_receipt" says "generate": a word for a change.
What this check looks for
Infogenerate_trust_receipt
The input schema at properties.request.description mentions "credentials".
Matched text
inputSchema.properties.request.description: "...y to hash; omit raw prompts, documents, credentials, cookies, auth headers, signatures, and..."
What this check looks for

Tools

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

6 tools

Changes things 5Creates or changes something that can be changed back.Claude Code: ask

boundary_guard_checkCreate a deterministic, read-only pre-action receipt from request, policy, and optional result evidence.1 finding
Why it is in this group
- The description's first verb is "create": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "boundary_guard_check" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The description's first verb is "create": a word for a change.
  What this check looks for
Description, as the server wrote it
Create a deterministic, read-only pre-action receipt from request, policy, and optional result evidence. Use before an agent posts, spends, lists, or writes so the decision can be audited; no external action is executed.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
- title: Boundary Guard Check
check_agent_tool_readinessGateCheck readiness: check whether an x402/agent-facing tool is ready for agent routing, marketplace listing, and paid-path monitoring, including public agent discovery surfaces (/…1 finding
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- High
  The description refers to "/.well-known/mcp.json".
  Matched text
  description: "...overy surfaces (/llms.txt, /agents.txt, /.well-known/mcp.json, /mcp). Pass target plus optional tier,..."
  What this check looks for
Description, as the server wrote it
GateCheck readiness: check whether an x402/agent-facing tool is ready for agent routing, marketplace listing, and paid-path monitoring, including public agent discovery surfaces (/llms.txt, /agents.txt, /.well-known/mcp.json, /mcp). Pass target plus optional tier, marketplace_url, expected_resources, and paid_path; deep/report tiers add unpaid 402 probing when paid_path is supplied. Tiers: quick $1, deep $5, report $10.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
- title: GateCheck Readiness
generate_trust_receiptGenerate a deterministic trust receipt from sanitized request/policy/result/payment summaries.2 findings
Why it is in this group
- The name "generate_trust_receipt" says "generate": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Info
  The input schema at properties.request.description mentions "credentials".
  Matched text
  inputSchema.properties.request.description: "...y to hash; omit raw prompts, documents, credentials, cookies, auth headers, signatures, and..."
  What this check looks for
- Warn
  The server marks "generate_trust_receipt" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "generate_trust_receipt" says "generate": a word for a change.
  What this check looks for
Description, as the server wrote it
Generate a deterministic trust receipt from sanitized request/policy/result/payment summaries. Do not submit raw auth headers, cookies, API keys, private keys, payment signatures, payment response headers, customer prompts, customer documents, or payer-identifying evidence.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
- title: Trust Receipt
generate_x402_launch_packGenerate marketplace-safe launch assets for an x402/MCP seller: listing copy, buyer FAQ, checklist, approval packet, and claim boundaries.1 finding
Why it is in this group
- The name "generate_x402_launch_pack" says "generate": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Findings
- Warn
  The server marks "generate_x402_launch_pack" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":true}; The name "generate_x402_launch_pack" says "generate": a word for a change.
  What this check looks for
Description, as the server wrote it
Generate marketplace-safe launch assets for an x402/MCP seller: listing copy, buyer FAQ, checklist, approval packet, and claim boundaries. Pass target plus optional product_name, audience, primary_use_case, marketplace_url, and paid_path; service/premium tiers include readiness evidence. Tiers: single $9, service $29, premium $49.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
- title: x402 Launch Pack Generator
probe_x402_paid_pathProbe a public x402 paid endpoint without signing or paying, then parse the HTTP 402 challenge.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.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Probe a public x402 paid endpoint without signing or paying, then parse the HTTP 402 challenge. Pass target plus optional expected network/asset/price to verify payment metadata and receive a deterministic health receipt.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
- title: x402 Paid-Path Health Probe

Only reads 1Looks things up and changes nothing.Claude Code: allow

scan_x402_resourceRead-only scan of a public API/provider URL for x402, OpenAPI, pricing, and agent-discovery metadata.No findings
Why it is in this group
- The description's first verb is "read": a word for reading.
Description, as the server wrote it
Read-only scan of a public API/provider URL for x402, OpenAPI, pricing, and agent-discovery metadata. Pass url, and optionally marketplace_url plus expected_resources, to get a readiness score, issues, and fixes; no private endpoints are called.
Annotations the server declares
- destructiveHint: false
- idempotentHint: true
- openWorldHint: true
- readOnlyHint: true
- title: x402 Resource Scan

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 0.1.3. Values in angle brackets are yours to fill in.

claude mcp add --transport http gatecheck https://proofbeforepay.vercel.app/gatecheck/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": [
      "mcp__gatecheck__scan_x402_resource"
    ],
    "ask": [
      "mcp__gatecheck__boundary_guard_check",
      "mcp__gatecheck__probe_x402_paid_path",
      "mcp__gatecheck__check_agent_tool_readiness",
      "mcp__gatecheck__generate_x402_launch_pack",
      "mcp__gatecheck__generate_trust_receipt"
    ],
    "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 gatecheck. Review it before you use it.

Keep track

Get told when this server's tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.LarryLemonBot/gatecheck/changes.xml

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Source: MCP Registry · repository. Synced Oct 21, 2026, 18:17 UTC.

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