Penny Engine — Agent Operations

penny_trend_radar

Read-only

Get recent US Google Trends rising-search queries and transparent heuristic purchase-intent classification to identify digital product research candidates. Public RSS, cached 10 minutes, no customer or sales data. Free, no signup.

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": "penny_trend_radar"
  }
}

Input Schema

Name	Required	Description	Default
`limit`	No	Maximum entries to return; integer 1–25, default 10
`commercialOnly`	No	Only include potential commercial-intent terms; default false

Schema Changelog

Changes observed during successful MCP inspections.

First observedOct 18, 2026

TDQS

A3.9/5.0

Behavior4/5

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

Annotations already declare readOnly, non-destructive and open-world behavior, so the safety profile is covered. The description adds genuinely useful behavioral context beyond that: the data source (public RSS), freshness constraint (cached 10 minutes), and the absence of customer/sales data. It does not, however, describe the returned fields or classification output format.

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?

Three compact sentences, front-loaded with what it does and followed by source/freshness/access caveats. No redundant restatement, though the density means each clause carries several facts.

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?

With no output schema, the description carries the return-value burden, and while it explains the nature of results (rising queries + intent classification) it stops short of describing the actual returned fields or structure. Data source, caching, and access terms are otherwise well covered for a simple read-only fetch tool.

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 both parameters (limit, commercialOnly) are fully documented in the schema. The description's mention of 'purchase-intent classification' loosely relates to commercialOnly but adds no syntax or format detail beyond the schema. Baseline 3 is appropriate.

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?

States a specific verb (Get) and resource (recent US Google Trends rising-search queries) plus the added value (heuristic purchase-intent classification). It also names the goal — identifying digital product research candidates — so an agent can tell it apart from the sibling economics/utility tools at a glance.

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

Usage Guidelines3/5

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

Usage is implied by the stated goal of finding product research candidates, but there is no explicit when-to-use, when-not-to-use, or named alternative among siblings. The agent must infer when this trend-fetching tool is appropriate versus other penny_ tools.

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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