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

With no annotations, the description carries the disclosure burden. It does reveal one important trait—signature verification is not performed—but omits expected output format, error behavior on invalid or malformed JWTs, and whether the raw token may include a 'Bearer ' prefix.

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 entire description is one short sentence that front-loads the action and the most important caveat. There is no filler, repetition, or unnecessary detail.

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?

This is adequate for a trivial one-parameter decoder, but it lacks return-value and error-handling details that would matter without an output schema. The caveat about signature verification helps, but the agent still cannot predict invalid-token behavior or the exact payload representation.

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 adds no information about the 'token' parameter beyond what the schema already shows. It does not clarify accepted token format (with/without header/payload/signature, Bearer prefix), so the single parameter is under-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 names a specific verb ('Decode'), a specific resource ('JWT payload'), and a key qualifier ('without signature verification'), so an agent can tell exactly what is offered. It also stands apart from the sibling utilities, none of which claim JWT decoding.

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 description implies the intended use: inspecting or extracting a JWT payload rather than checking authenticity. It gives no explicit when-to-use conditions and names no alternative for signature verification, leaving the routing decision partly to inference.

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