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Presend MCP Server

by io.github.presendapp
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JWT decode

jwt_decode
Read-onlyIdempotent

Decodes a JWT's header and payload WITHOUT verifying its signature, so its claims must not be trusted on this basis alone. To check authenticity, use jwt_verify.

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": "jwt_decode"
  }
}

Input Schema

NameRequiredDescriptionDefault
tokenYesThe JWT to decode. Decodes header and payload only -- does not verify the signature (use /jwt-verify for that).

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / token / description
      Previous value: -""New value: +"The JWT to decode. Decodes header and payload only -- does not verify the signature (use /jwt-verify for that)."
  2. First observed

TDQS

A4.4/5.0
Behavior4/5

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

Annotations already declare readOnly, idempotent, and non-destructive, so the description is right not to repeat safety metadata. It adds genuinely valuable context beyond annotations: that the signature is unverified and claims must not be trusted on this basis, which is the key behavioral caveat for a security-adjacent tool.

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 front-loaded sentences with zero filler; the security caveat and the routing alternative each earn their place.

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 single-input decoding tool with no output schema and annotations covering the safety profile, the description supplies the essential caveat and the redirect to jwt_verify. It could say a touch more about the decoded shape (header/payload only), though it already implies this.

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% and the single 'token' parameter is fully documented in the schema, which even repeats the no-verification caveat. The description adds no format or syntax detail beyond what the schema already provides, so baseline 3 applies.

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?

States a specific verb (decodes) and resource (JWT's header and payload) and immediately distinguishes itself from jwt_verify by scoping what it does NOT do. An agent can pick it apart from jwt_verify without inspecting schemas.

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 names the alternative (jwt_verify) and the condition selecting it ('to check authenticity'). The when-to-use/when-not-to-use split is fully enumerated in two sentences.

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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