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

Annotations already establish read-only, non-destructive behavior. The description adds the important behavioral precondition that a registered, subscribed integration is required and that the agent must present the same agent_token, which is beyond what the annotations say.

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?

One sentence front-loads the purpose and then gives the required call order with no filler. Every phrase earns its place.

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?

Given rich parameter descriptions and safety annotations, the only real gap is the absence of an output schema or explicit statement of how the HTML digest is returned/delivered. The core prerequisites and auth flow are covered.

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 coverage is 100%, so the schema already documents since, category, agent_name, and agent_token, including the 'Never put it in URLs' rule. The description only reinforces using the same token and does not add new parameter-level meaning.

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 verb and deliverable ('Generate a branded HTML digest') plus a scope ('your subscribed integration'), which distinguishes it from sibling tools like search_articles, get_culture_news, and subscribe.

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 explicitly states the prerequisite sequence: 'Call register_agent, then subscribe with its agent_token; use that same token here.' It does not spell out when to prefer this over the other content tools, so it stops short of a full when/when-not guide.

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