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Hermes MCP Server

Hermes MCP Server

by darrenzwchan
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Hybrid

hermes_check_auth

Validates the Hermes session cookie to resolve authentication errors in other tools.

Instructions

Check whether the Hermes session cookie is valid. Call this if other tools fail with an auth error.

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": "hermes_check_auth"
  }
}

Input Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

A4.7/5.0
Behavior4/5

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

No annotations are provided, so the description carries the full burden. It states the tool checks cookie validity, implying a boolean or success/failure response. While it does not detail the exact output format, the behavior is straightforward and the description is sufficient for a simple check 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?

The description consists of just two sentences, with the key action and usage context front-loaded. Every word is essential, with no redundancy or fluff.

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?

Given the tool has zero parameters, no output schema, and a simple purpose, the description is complete. It provides all necessary context for an agent to understand when and why to invoke this tool.

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?

There are no parameters, so schema coverage is trivially 100%. The description adds no parameter information, but none is needed as the tool takes no inputs.

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 uses the verb 'check' and specifies 'Hermes session cookie validity', clearly indicating what the tool does. It distinguishes itself from sibling tools like hermes_login and hermes_sharepoint_login, which are for obtaining authentication, not checking its validity.

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?

The description explicitly states when to call this tool: 'Call this if other tools fail with an auth error.' This provides clear guidance on the appropriate context, directing agents to use it as a diagnostic step.

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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