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

With no annotations provided, the description carries the full burden of behavioral disclosure. It does disclose two key behaviors: no network call (offline) and no signature verification (unverified). It stops short of explaining invalid-token handling, but for a simple decode tool the disclosed traits are meaningful and honest.

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?

The description is one short, dense sentence with no filler. It front-loads the core action and includes the two most important behavioral qualifiers. Every word earns its place.

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 single-parameter utility with an output schema, the description is nearly adequate, but it does not explicitly explain what q should contain or how invalid input is handled. The behavioral qualifiers are useful, yet the parameter gap and lack of usage context leave some important information missing.

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%, and the description never mentions the 'q' parameter at all. The tool's purpose strongly implies q is the JWT token, but the description does not explicitly state this or define accepted formats. The parameter semantics are left to inference rather than documented.

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 description clearly states a specific verb and resource: decode JWT header and payload. It adds important qualifiers—offline and unverified—which distinguish it from likely siblings like 'jwt' or generic 'decode'. An agent can confidently know what this tool does.

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?

The terms 'offline' and 'unverified' imply this tool is for quick inspection rather than security-sensitive verification, but the description never explicitly says when to use it versus alternatives. No alternatives are named, so the agent must infer the boundary with siblings like 'jwt'.

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