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

Annotations already declare idempotentHint=true and destructiveHint=false, and the description repeats the idempotency verbatim (redundant but not contradictory). It adds genuinely new behavioral context beyond the annotations: no one is ever charged, and the save is gated on explicit user request.

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, front-loaded sentences with no filler; the core action, the gating condition, and the safety/reassurance facts each get their own clause.

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, non-destructive tool with no output schema, the description covers action, trigger condition, and side effects adequately. It could be slightly clearer about the relationship between unlock_list and save_list given they are stated to produce the same result, but nothing essential for calling the tool 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?

Schema description coverage is 100% and the single 'list' parameter is fully documented with accepted identifier forms in the schema. The description only hints at payload scope ('with its new picks') and adds no identifier syntax beyond what the schema already provides, 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?

The description gives a concrete verb and resource ('Save a live free list with its new picks') and explicitly relates it to the sibling save_list, so the agent can locate it in the toolset. However, the tool name unlock_list is at odds with the 'save' behavior, which adds some ambiguity that the description only partially resolves.

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 states a clear gating condition ('only when the person asks') and names the equivalent alternative ('Same result as save_list'). It stops short of explaining when to prefer this tool over save_list if their results are identical, leaving a real routing question unanswered.

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