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jongan69

Shopping Deals MCP Server

by jongan69

find_best_deals

Find and rank the strongest deals across eBay, Amazon, Craigslist, OfferUp, and Google Shopping, with tax estimation and deal warnings.

Instructions

Search products and rank the strongest deals with reasons and warnings.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
queryYes
sourcesNo
locationNo
conditionNoany
price_maxNo
price_minNo
max_resultsNo
tax_on_shippingNo
tax_rate_percentNo
max_results_per_sourceNo
Behavior2/5

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

No annotations provided. Description hints at ranking and warnings but lacks detail on what 'strongest' means, return format, authentication, or any side effects.

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

Conciseness3/5

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

One 12-word sentence is concise but lacks structure. It conveys purpose but no additional details for an agent to use effectively.

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

Completeness1/5

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

With 10 parameters, no output schema, and complex behavior (ranking, warnings), the description is far too minimal. Agents would lack understanding of inputs and outputs.

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

Parameters1/5

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

Schema coverage is 0%; the description does not explain any of the 10 parameters (e.g., query, sources, price_max). No added 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 uses a specific verb ('Search...rank') and resource ('deals'), and distinguishes from siblings like 'find_cheapest_offers' by mentioning 'strongest deals with reasons and warnings.'

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

Usage Guidelines2/5

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

No guidance on when to use this tool vs alternatives like 'find_cheapest_offers' or 'compare_prices.' The description implies ranking but doesn't specify context.

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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