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ebay-mcp

by YosefHayim
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TypeScript
Remote

ebay_register_client

Register a third-party financial app with eBay for Open Banking and PSD2 compliance. Requires a valid eIDAS certificate and mutual TLS.

Instructions

Register a third party financial application with eBay (Open Banking / PSD2). Requires valid eIDAS certificate via MTLS.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
clientSettingsYesGenerated ClientSettings request body

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed6 schema fields changedv1.14.1
    • changedInput schema / properties / clientSettings / description
      Previous value: -"Client registration settings"New value: +"Generated ClientSettings request body"
    • changedInput schema / properties / clientSettings / properties / contacts / description
      Previous value: -"Array of contact email addresses"New value: +"Contact email addresses for the registrant"
    • changedInput schema / properties / clientSettings / properties / policy_uri / description
      Previous value: -"HTTPS URL to privacy policy document"New value: +"HTTPS URL to the application privacy policy"
    • changedInput schema / properties / clientSettings / properties / redirect_uris / description
      Previous value: -"Array of redirect URIs"New value: +"OAuth redirect URIs"
    • changedInput schema / properties / clientSettings / properties / software_id / description
      Previous value: -"Unique identifier for the client software"New value: +"Stable identifier for the client software"
    • changedInput schema / properties / clientSettings / properties / software_statement / description
      Previous value: -"Base64-encoded Software Statement Assertion (SSA) JWT"New value: +"Base64-encoded Software Statement Assertion JWT"
  2. First observedv1.8.10

TDQS

A3.7/5.0
Behavior2/5

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

No annotations are provided, so the description must cover behavioral traits. It only mentions prerequisites, not side effects, idempotency, or what happens after registration. For a write operation, this is insufficient.

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?

Two sentences: first defines the purpose, second adds a critical requirement. Every sentence is essential and front-loaded. No waste.

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?

With one nested parameter and no output schema, the description covers the purpose and prerequisite but omits details about the response or any registration ID. It is adequate but not comprehensive.

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 is 100%, so the schema already documents all parameters. The description adds no extra meaning beyond stating the purpose, meeting the baseline expectation.

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 action ('Register'), the resource ('third party financial application'), and the context ('Open Banking / PSD2'). This distinguishes it from sibling tools, which focus on reports, promotions, listings, etc.

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 notes a critical prerequisite ('Requires valid eIDAS certificate via MTLS'), guiding the agent on when to use. It does not explicitly state when not to use, but the purpose is niche enough to imply exclusivity.

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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