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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is partly covered. The description adds genuinely useful behavioral context beyond them: it is a sandbox, the link is non-functional, nothing is recorded, and the returned disclosure_text must be surfaced to the user. That is real value the annotations do not convey.

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 with zero waste, led by the most important qualifier ('SANDBOX.'). The behavioral constraints and the required user-facing obligation are all front-loaded and easy to scan.

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 carries the return-value burden and does describe what comes back (a non-functional example link and a disclosure_text). It covers the essential caveats for a 3-parameter sandbox tool, though it says nothing about error or failure behavior.

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 100%, so all three parameters are already documented, including that context is ignored in the sandbox and that agent_id is not stored. The description adds no parameter-level meaning, so the baseline 3 applies.

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 and resource: returns a non-functional example link plus a disclosure_text. The sandbox prefix and the phrase 'non-functional example link' make the purpose unambiguous. It does not explicitly name or contrast with search_offers, but the operations are clearly distinct.

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 this is the tool for obtaining a link and adds an obligation ('you MUST show the user the disclosure_text'), but it never states when to use it versus alternatives or any preconditions/exclusions beyond the sandbox flag. Usage is implied rather than spelled out.

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