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

Beyond the annotations, the description discloses two useful behaviors: no storage or reads occur, and the response is only a count of bytes discarded. This is meaningful for a tool whose annotations (readOnlyHint=false, idempotentHint=false) would otherwise leave an agent unsure whether side effects persist.

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?

Three short sentences, each carrying distinct information: the action, the absence of storage/read, and the return value. Nothing is redundant and the key constraint is front-loaded.

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 one-parameter, no-side-effect tool with no output schema, the description covers the action, the state guarantee, and the return value. Only the rationale for when an agent would invoke it is 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?

With a single parameter at 100% schema coverage, the schema already explains that 'text' accepts anything and will not be kept. The description adds no format, size, or encoding constraints, so it meets but does not exceed the baseline.

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 states a specific action and object ('Send text to be discarded') in the first clause, so an agent knows exactly what the tool acts on. There are no siblings to differentiate against, which keeps this just short of a 5.

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?

It never says when to use this rather than another tool, or when not to use it. The purpose is implied by the name and the first sentence, but there is no explicit guidance or exclusion.

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