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anatolykoptev

n8n MCP Agent

get-credential-schema

Retrieve the credential data schema for a specific credential type, showing required fields and structure.

Instructions

Show credential data schema for a specific credential type.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
clientIdYesClient ID from init-n8n
credentialTypeNameYesCredential type name (e.g., 'githubApi')
Behavior3/5

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

No annotations are provided, so the description bears the full burden. It correctly indicates a read-only operation ('Show'), but lacks additional behavioral context such as authentication requirements or error conditions. For a simple read tool, this is adequate but not exceptional.

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, concise sentence with no wasted words. It is front-loaded and immediately conveys the tool's purpose.

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?

The description does not explain the output (no output schema exists). For a tool that returns a schema, stating what that schema looks like or its format would improve completeness. However, given the tool's simplicity and the surrounding sibling context, the current description is marginally adequate.

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?

The input schema has 100% description coverage for both parameters (clientId and credentialTypeName). The tool description adds no new information beyond 'for a specific credential type', which repeats the schema description. 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?

The description clearly states the verb 'Show' and the resource 'credential data schema' for a specific credential type. It distinguishes from sibling tools like create-credential or list-credentials, which perform different actions.

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?

The description implies usage for viewing schema before creating credentials, but does not provide explicit when-to-use or when-not-to-use guidance, nor does it mention alternatives. The context is implied rather than stated.

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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