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

Annotations declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, and the description does not contradict them. It adds real value by naming the mutated resource (the exclusion list) and the billing trait ("Free"), but it says nothing about the non-idempotent behavior the annotation flags or what happens if the term isn't currently excluded.

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, purpose front-loaded, no filler. Even the terse "Free." fragment carries an actionable billing fact rather than padding.

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?

With no output schema, the description should carry the behavioral load, and it covers purpose, the key parameter constraint, and cost. It falls short only on failure/idempotency behavior for a non-read-only, non-idempotent mutation.

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 100%, so the baseline is 3, but the description adds a constraint the schema itself does not enforce: exactly one of keyword or topic is required, with the other omitted. That mutual-exclusion rule is materially useful beyond the structured fields.

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?

States a specific verb (removes), the resource (keyword or topic from the exclusion list), and the downstream consequence (the planner may use it again). This is clearly the inverse of exclude_keyword/exclude_topic, so an agent can place it against those siblings without opening a schema.

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?

Usage is only implied: the description makes clear it undoes an exclusion, but it never states when to reach for it versus exclude_keyword, exclude_topic, or dismiss_topic, nor any prerequisite such as the term actually being excluded. The 'Give exactly one of keyword or topic' line is a constraint, not selection guidance.

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