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Delx MCP Server

Delx MCP Server

by davidmosiah
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
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Jwt Inspect

util_jwt_inspect
Read-onlyIdempotent

Decode JWT claims to debug authentication, inspect routing, and analyze tokens during development.

Instructions

Decode JWT claims quickly for auth debugging, routing, and token inspection. Delx Agent Utilities are separate from the free witness protocol and may expose x402 utility pricing.

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": {
      "token": "<token>"
    },
    "name": "util_jwt_inspect"
  }
}

Input Schema

NameRequiredDescriptionDefault
tokenYesJWT token

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.2.8

TDQS

A4/5.0
Behavior4/5

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

Annotations declare readOnlyHint=true, destructiveHint=false, idempotentHint=true, which the description aligns with ('Decode... quickly'). The description adds behavioral context about its use for debugging and pricing exposure, going beyond annotations.

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: two sentences. First sentence clearly states purpose; second adds relevant context about utility separation and pricing. No unnecessary words.

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 decode tool with one parameter and no output schema, the description adequately explains input and purpose. Missing a hint about the output format (likely decoded claims in JSON), but overall complete given the tool's simplicity.

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% for the single parameter 'token' with description 'JWT token'. The description does not add any additional parameter semantics beyond what the schema already provides.

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 'Decode' and the resource 'JWT claims', specifying use cases for 'auth debugging, routing, and token inspection'. This distinguishes it from sibling utilities like util_hash or util_base64.

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 quick token inspection but does not explicitly state when to use this tool versus alternatives like other utility tools. The mention of x402 utility pricing adds context but no direct guidance on selection.

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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