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

Annotations already declare readOnlyHint=true and destructiveHint=false. The description adds useful behavioral context beyond that: the form is opened only after sign-in and the server verifies the class is free and available. This gives the agent meaningful expectations without contradicting the annotations.

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 only two sentences, front-loads the core action, and each sentence contributes useful information: what happens and what the server verifies. There is no filler or redundant restatement of the title.

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 only two simple parameters, an output schema, and annotations covering the safety profile, the description is close to adequate. Still, it omits any explanation of the required parameters and does not position this tool relative to submit_free_trial_inquiry, which are notable gaps for an agent selecting and invoking the tool.

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%, so the description carries the full burden for explaining branch_slug and occurrence_key. It does not mention either parameter or clarify how they map to the class or branch being checked. The agent is left to guess from variable names 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 uses a specific verb ('Open') and names the exact resource ('free trial inquiry form'), making the basic purpose clear. It does not explicitly contrast itself with the sibling submit_free_trial_inquiry, but the open-vs-submit distinction is reasonably inferable from the verb.

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 gives a clear prerequisite ('after Compteam sign-in') and notes a server-side validation condition, which implies when the tool is appropriate. However, it does not mention when not to use it or how it relates to alternatives like submit_free_trial_inquiry, leaving the routing partially implicit.

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