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

Annotations already declare readOnlyHint=true, destructiveHint=false, openWorldHint=true, and idempotentHint=false, so the safety and external-call profile is covered. The description reinforces the read-only nature ('Read') and the external dependency ('connected broadcaster'), which is mild added value. It does not describe rate limits, pagination, or what happens when no schedule exists.

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 the primary action front-loaded in the second sentence after the usage trigger. The closing platform-scope note is slightly tangential but short and non-redundant. Nothing is bloated.

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?

An output schema exists, so return values need not be explained, and annotations carry the read-only/external profile. For a single-parameter read tool, the description covers purpose, timing, and domain scope adequately. The only gap is the undocumented account_id semantics, which is a minor omission.

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% for the single account_id parameter, so the description has to compensate. Saying 'the connected Twitch broadcaster's stream schedule' implies account_id identifies which broadcaster's schedule is read, which adds modest meaning. It does not specify format or whether the ID is a platform account ID versus an internal one.

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 states a specific verb and resource: 'Read the connected Twitch broadcaster's stream schedule.' That is unambiguous, and the added note that Twitch is a community/stream platform clarifies the domain. It does not differentiate against the listed siblings, but those cover unrelated functions (analytics, diagnostics, posting), so confusion risk is low.

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 usage context: 'Use this to inspect Twitch stream scheduling before creating or changing community activity.' That tells the agent when the tool is relevant. It stops short of naming a specific alternative or a when-not-to-use condition, so it falls short of a 5.

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