generate_pinGenerate a cryptographically-random numeric PIN (keyless, offline).
| Name | Required | Description | Default |
|---|---|---|---|
| count | No | How many (1-50, default 1). | |
| length | No | PIN length (3-32, default 6). |
Changes observed during successful MCP inspections.
Input schema / examplesAdded value: +[
+ {
+ "length": 6
+ },
+ {
+ "count": 3,
+ "length": 8
+ }
+]Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Adds context beyond annotations: 'cryptographically-random' explains non-deterministic output, 'keyless, offline' clarifies environment. However, annotation idempotentHint=true contradicts randomness, implying potential confusion.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Single short sentence with zero wasted words. Includes essential purpose and key qualifiers (cryptographically-random, keyless, offline).
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
No output schema, so description should hint at return format. It does not specify whether output is a single string or array for multiple PINs, though the count parameter implies multiple.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema provides full coverage (100%) with descriptions for both parameters (count, length) including defaults and ranges. Description adds no additional parameter information.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Clear verb ('Generate') and specific resource ('cryptographically-random numeric PIN'). Qualifiers 'keyless, offline' distinguish it from sibling tools like 'generate_password'.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No explicit when-to-use or when-not-to-use guidance. Implicitly suggests offline keyless use case, but does not mention alternatives or constraints relative to siblings.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.