Synmerco

marketplace_get_listing

Get the full record of a Build Hub listing: pricing, supported protocols, supported chains, rate cards, and trust signals from the lister. Everything your agent needs to decide whether to hire or skip. Free, no auth required.

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": {
      "id": "<id>"
    },
    "name": "marketplace_get_listing"
  }
}

Input Schema

Name	Required	Description	Default
`id`	Yes	Listing UUID

Schema Changelog

Changes observed during successful MCP inspections.

First observedApr 25, 2026

TDQS

A4.2/5.0

Behavior4/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It adds valuable context by stating 'Free, no auth required' and enumerates the type of data returned. It does not cover error cases, but for a read-only retrieval tool this is adequate.

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 concise and front-loaded with the primary action. Two sentences convey purpose, contents, and safety information without waste.

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 simple single-parameter get tool, the description adequately covers what the tool does and what it returns. It does not describe output format or error behavior, but the low complexity and explicit content list make it sufficiently complete for actual use.

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% with a single 'id' parameter described as 'Listing UUID.' The description does not add extra parameter semantics beyond the schema, so the baseline score of 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?

The description clearly states the tool 'Get the full record of a Build Hub listing' with a specific verb and resource. It enumerates the contents (pricing, protocols, chains, rate cards, trust signals) and distinguishes itself from related marketplace tools like search or post by focusing on the full record retrieval.

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 provides clear usage context by stating 'Everything your agent needs to decide whether to hire or skip,' implying when to use this tool for decision-making. However, it does not explicitly name alternatives or exclusions, so it falls just short of a 5.

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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