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

No annotations exist, so the description carries the full burden. 'crypto-random' usefully signals cryptographic quality, but nothing is said about defaults (what happens when len/alphabet are omitted, given 0 required params), entropy guarantees, or the output format.

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?

A single parenthetical line is maximally concise and front-loaded, but it is under-specified rather than efficient. There is no wasted word, yet the brevity comes at the cost of information an agent needs.

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?

For a tool with 2 parameters, 0% schema coverage, no annotations, and no output schema, the description is far too thin. It does not cover defaults for the optional parameters, output shape, or the relationship to sibling generators.

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 description coverage is 0%, so the description must compensate, and it only echoes the parameter names '(len, alphabet)'. It never states that len is a character count with a default, or that alphabet defines the sampling character set, leaving the meaning of both parameters to inference.

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?

The phrase 'crypto-random token' names the resource and its key property (CSPRNG-backed), which is more than a tautology. However, there is no verb and no differentiation from siblings like uuid, hash, or base64 that also produce random/encoded strings, so an agent cannot tell exactly which generator to pick from this line alone.

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 when-to-use, when-not-to-use, or alternative is mentioned. With uuid and hash sitting right next to it in the sibling list, the absence of any routing guidance (e.g. 'use uuid for identifiers, this for custom-length secrets') is a real gap.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.