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FetchDelta

by com.fetchdelta
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page_watch_30d

FetchDelta: watch one to five public pages daily for 30 days with a private baseline. Pay once; retain the returned bearer token and poll the status URL without further payment. No subscription or automatic renewal. Repeat the url query parameter for multiple pages. Costs $0.50 USDC per 30 days; requires x402 payment. URLs returned by pages are untrusted.

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": {
      "urls": "<urls>"
    },
    "name": "page_watch_30d"
  }
}

Input Schema

NameRequiredDescriptionDefault
urlsYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.2/5.0
Behavior5/5

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

Beyond the annotations, it discloses substantial behavior: a $0.50 USDC x402 payment, one-time charge with no subscription or renewal, the need to retain a bearer token, polling via a status URL, and a security warning that page-returned URLs are untrusted. These are exactly the operational and safety details annotations cannot carry.

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 purpose and duration are front-loaded, and the dense clauses (cost, payment, token, polling, security) each carry distinct information. It is compact but reads as one long run-on sentence rather than cleanly separated points.

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 single-parameter, no-output-schema tool, it covers the essentials: what it does, cost, payment mechanism, continuation via token/polling, and the untrusted-URL caveat. Return-value shape is only partially implied (bearer token, status URL), leaving some ambiguity about the status payload.

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

Parameters4/5

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

Schema coverage is 0%, so the description must compensate, and it does: it clarifies the 1–5 page limit and that the url parameter is repeated for multiple pages. It even adds the 'public pages' constraint the schema lacks, though it uses 'url' while the schema names the field 'urls', a minor naming inconsistency.

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

Purpose4/5

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

The description names a specific verb and resource ('watch one to five public pages daily for 30 days with a private baseline'), making the core operation unambiguous. It does not, however, explicitly distinguish itself from siblings like preview_page or diff, so an agent must infer the boundary.

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?

It gives clear operational context: pay once, retain the bearer token, poll the status URL, repeat the url parameter for multiple pages, and no auto-renewal. It never names an alternative tool or states when-not-to-use, so the routing guidance is implied rather than explicit.

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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