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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds useful behavior beyond that: no input required, a hard cap of 50 results, newest-first ordering, inclusion of GAMES.GG urls, and the fact that only redeem-code guides can appear. It doesn't say what happens when more than 50 exist (truncation vs. paging).

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?

Four short sentences, each carrying distinct information: trigger, scope constraint, call shape, and return characteristics, all front-loaded. Nothing is redundant with the title or annotations.

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 parameterless read tool with an output schema, the description covers the trigger, the domain restriction, and the result shape, so the agent has what it needs to call it. The only gap is the 50-item cap lacking guidance on retrieving further results, a minor omission given the output schema exists.

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 zero parameters the baseline is 4, and the description explicitly states 'Takes no input,' removing any ambiguity about whether filters are accepted. There is no further parameter meaning to add.

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 names a specific resource (redeem code follows / alerts) and a specific scope ('Alerts come only for redeem code guides'), which distinguishes it from sibling list tools such as my_saved_guides and my_games. An agent can identify the tool from the first sentence without opening the 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?

It gives an explicit trigger ('Use when the user asks which games they get redeem code alerts for on GAMES.GG') and points forward to unfollow_codes for the follow-up action. It stops short of naming exclusions versus similar list tools like my_saved_guides, so the agent must infer the boundary from the 'redeem code guides only' clause.

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