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FabTally Guard

by io.github.zvmzaretsky
OverviewDiscussionsAdmin

Public url -> clean Markdown + token count (paid $0.004)

url_read

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.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "url": "<url>"
    },
    "name": "url_read"
  }
}

Input Schema

NameRequiredDescriptionDefault
urlYesThe public web page URL to fetch and convert to Markdown.
x_paymentNox402 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.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.1/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden. It discloses the x402 payment flow, robots.txt respect, the no-login/no-paywall policy, and the 'nothing stored' privacy guarantee. It also explains the challenge/billing behavior. However, it omits error handling details and what happens for non-HTML content.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is moderately concise and front-loaded with the key paid aspect. It uses a few sentences but avoids fluff. The explanation of the x402 payment flow adds necessary complexity, but each sentence contributes meaning. Could be slightly tighter, but it's well organized.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a paid fetch tool without an output schema, the description covers the essential return types (Markdown + token estimate, x402 challenge), the payment workflow, and constraints. It lacks information about failure modes (e.g., robots.txt blocks, network errors) and the exact challenge format, but overall it is quite complete for an agent to use successfully.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the baseline is 3. The description adds minimal value beyond the schema: it summarizes 'Args: url' and echoes the x_payment settlement flow, but does not provide additional semantic details not already in the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the verb ('Fetch a PUBLIC url'), the resource (public web page), and the output ('clean Markdown + a token estimate'). It also notes the stripping of boilerplate, making it distinct from siblings like deps_check or json_repair.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description gives explicit context for when to use: for RAG ingestion of public pages. It also states exclusions: 'public pages only, no login/paywall bypass'. It doesn't explicitly mention alternative tools, but the sibling set is unrelated, so this is sufficient guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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