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Deferno MCP Server

Deferno MCP Server

by Circuit-Stitch
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

start_auth

Initiates the Deferno authentication flow by providing a URL for browser-based OIDC login, then accepts a short code to complete authorization for CLI transport.

Instructions

Begin the Deferno authentication flow.

Returns a URL for the user to open in their browser. The user authenticates via the OIDC provider, then sees a short code to paste back here.

NOTE: In HTTP transport with OAuth enabled, authentication is handled automatically by the transport layer. This tool is only needed for stdio/CLI transport.

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": "start_auth"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Output Schema

NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.7/5.0
Behavior4/5

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

Describes the flow: returns URL, user opens browser, authenticates via OIDC, and sees a short code to paste. No annotations, so description covers behavior well, though could mention idempotency or state reset. No contradiction with annotations (none).

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?

Concise two-paragraph description with clear structure. Every sentence adds value: purpose, return value, flow steps, and transport note.

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

Completeness5/5

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

Fully adequate for a zero-parameter authentication initiation tool. With no parameters and an output schema (presumably containing the URL), the description covers everything needed.

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

Parameters4/5

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

No parameters; baseline 4 applies as description does not need to add meaning beyond the empty schema. Adequately explains the tool's function.

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 states it 'Begin the Deferno authentication flow' and returns a URL, clearly identifying it as the first step in authentication. Distinguishes from sibling tools like complete_auth.

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

Usage Guidelines5/5

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

Explicitly notes that in HTTP transport with OAuth, authentication is handled automatically, and this tool is only needed for stdio/CLI transport. Provides clear when-to-use guidance.

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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