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

With no annotations, the description carries the full burden and largely fails to meet it: it does not say whether verification is a safe read, what is returned or thrown on failure, or which key source is required for which algorithm. Only the bare nature of the operation ('verify a signature') is conveyed.

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, front-loaded sentence with no filler or redundancy. It is efficient, though its brevity reflects missing content rather than tight editing.

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 4-parameter tool with no annotations and no output schema, the description omits key success/failure semantics, key-selection rules, and any notion of what verification produces. It is under-specified relative to the tool's complexity.

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 coverage is 75% and the description adds nothing about any parameter. Notably, the mutually exclusive key inputs (jwk vs secret vs jwks_url, depending on algorithm) and the token parameter's empty description leave the agent to infer selection logic from the schema alone.

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 gives a specific verb ('Verify') and resource ('a JWT's cryptographic signature'), which is more precise than the sibling jwt_decode's implied purpose. It does not explicitly name or contrast with jwt_decode, so the distinction is inferred from names rather than stated.

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?

There is no guidance on when to verify versus decode with jwt_decode, nor any note about prerequisites such as needing a key or the token being untrusted. The agent must infer the applicable context entirely.

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