FabTally Guard
Verify before you act: deps-check, x402-preflight, json-repair & url-read for agents.
我该使用它吗
质量与安全性
基于对工具定义和协议合规性的自动分析。
上下文开销
这是每次将服务器的工具加载到模型上下文窗口时所消耗的大致 token 数。数值越高，可用于其他任务的注意力就越少。
安装
一键安装
将以下内容添加到你的 `claude_desktop_config.json` 文件中：
{
"mcpServers": {
"fabtally-guard": {
"url": "https://guard.fabtally.com/mcp"
}
}
}远程端点
https://guard.fabtally.com/mcpstreamable-http它能做什么
工具清单
工具（4）
🟢deps_check(ecosystem, name, version, x_payment)
PAID $0.003 (x402, USDC on Base). Vet a software package BEFORE installing it. Returns existence, latest-vs-requested, deprecation/yank markers, known CVEs from OSV.dev, typosquat similarity to popular names, SPDX license, and age/download signals with a plain-English risk verdict. Args: ecosystem (npm|pypi|crates), name, version (optional). Without payment returns the x402 challenge; pass x_payment to settle.
输入模式
{
"type": "object",
"properties": {
"ecosystem": {
"type": "string",
"enum": [
"npm",
"pypi",
"crates"
],
"description": "Package ecosystem: npm | pypi | crates."
},
"name": {
"type": "string",
"description": "Package name, e.g. 'lodash', 'requests', 'serde'."
},
"version": {
"type": "string",
"description": "Specific version to check for CVEs (optional; defaults to latest)."
},
"x_payment": {
"type": "string",
"description": "x402 payment payload (base64) for this PAID check. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
}
},
"required": [
"ecosystem",
"name"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢x402_preflight(url, x_payment)
PAID $0.002 (x402, USDC on Base). Verify another x402 endpoint BEFORE paying it: does an unpaid call return a valid x402 v2 402 challenge? do the quoted amount/asset/network/payTo match the site's /.well-known/x402? is TLS valid, host reachable, openapi present? Returns pass/fail + per-check reasons + the parsed price you would pay. Args: url. Without payment returns the x402 challenge; pass x_payment to settle.
输入模式
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "The x402 endpoint URL to verify, e.g. https://example.com/v1/thing."
},
"x_payment": {
"type": "string",
"description": "x402 payment payload (base64) for this PAID check. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
}
},
"required": [
"url"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🔴json_repair(json, schema, x_payment)
PAID $0.002 (x402, USDC on Base). Coerce near-miss LLM JSON to a JSON-Schema-conformant object: strip code fences/prose, fix trailing commas/quotes/unquoted keys, normalise Python literals, balance brackets, then coerce types, apply defaults, and drop extraneous keys. Returns the repaired object OR precise per-field errors. Args: json (the raw string), schema (a JSON Schema object). Without payment returns the x402 challenge.
输入模式
{
"type": "object",
"properties": {
"json": {
"type": "string",
"description": "The raw, possibly-malformed JSON text to repair."
},
"schema": {
"type": "object",
"additionalProperties": {},
"description": "A JSON Schema (draft 2020-12) object the result must conform to."
},
"x_payment": {
"type": "string",
"description": "x402 payment payload (base64) for this PAID check. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
}
},
"required": [
"json",
"schema"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢url_read(url, x_payment)
PAID $0.004 (x402, USDC on Base). Fetch a PUBLIC url and return clean Markdown + a token estimate for RAG ingestion — readability extraction, boilerplate stripped. Respects robots.txt, public pages only, no login/paywall bypass, nothing stored. Args: url. Without payment returns the x402 challenge; pass x_payment to settle.
输入模式
{
"type": "object",
"properties": {
"url": {
"type": "string",
"description": "The public web page URL to fetch and convert to Markdown."
},
"x_payment": {
"type": "string",
"description": "x402 payment payload (base64) for this PAID check. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
}
},
"required": [
"url"
],
"additionalProperties": false,
"$schema": "http://json-schema.org/draft-07/schema#"
}社区
证据