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fresh-feeds — trending/new/changed MCP servers + x402 change-data API

by io.github.foomworks
OverviewDiscussionsAdmin

get_registry_changes

PAID (x402): returns x402 payment instructions for the registry delta (added/removed/changed servers) since a daily baseline — the cheap habit endpoint for repeat callers.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "get_registry_changes"
  }
}

Input Schema

NameRequiredDescriptionDefault
sinceNobaseline date YYYY-MM-DD (see feeds_status for available dates)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.9/5.0
Behavior3/5

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

No annotations are provided, so the description carries the burden. It discloses that the endpoint is PAID and involves x402 payment instructions, and that it returns delta information. However, it does not explain the payment flow, rate limits, or response format, leaving some ambiguity about what exactly is returned.

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

Conciseness5/5

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

The description is a single, front-loaded sentence that conveys the paid nature, the resource, and the delta scope without unnecessary verbiage. Every part earns its place.

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

Completeness3/5

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

For a simple one-parameter tool with no output schema and no annotations, the description provides the essential purpose and usage hint, but it leaves out details about the exact return payload and the mechanics of the x402 payment process. It is adequate but has gaps.

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 coverage for the single parameter is 100%, with the schema already describing the 'since' parameter and referencing feeds_status. The description only adds the phrase 'since a daily baseline,' which aligns but does not provide new semantic meaning beyond 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 tool returns x402 payment instructions for the registry delta (added/removed/changed servers) since a daily baseline. This distinguishes it from sibling tools like get_registry_highlights or get_mcp_registry_snapshot, which focus on highlights or full snapshots.

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 phrase 'the cheap habit endpoint for repeat callers' indicates when to use this tool, implying it is for frequent, cost-sensitive delta requests. However, it does not explicitly name alternatives or state when not to use it, but the context is reasonably clear.

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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