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

Annotations already declare read-only, idempotent, non-destructive behavior. The description adds useful context beyond annotations by explaining what the response contains: issue text, current status with blockers, and sent-issue metrics including link-level clicks. "Free" is ambiguous but does not contradict the annotations.

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?

The definition is a single compact sentence with the core resource front-loaded. The parenthetical "with what holds it up, if anything" is slightly colloquial and the trailing "Free." is abrupt, but overall it is efficient.

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 one fully documented parameter, rich read-only annotations, and no output schema, the description appropriately explains the key returned information. It does not cover edge cases such as a missing issue_id or permission failures, but it is largely complete for a simple read tool.

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?

Only one parameter is required and the schema fully documents it as the issue_id returned by newsletters_write_issue. The description adds no additional parameter meaning, so the 100% schema coverage baseline of 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 clearly identifies the resource as a single issue and enumerates its contents: text, status/blockers, and post-send analytics. It distinguishes itself from list-style siblings through the singular "One issue" framing, though it does not explicitly name an alternative tool.

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?

There is no explicit guidance on when to use this tool versus newsletters_list_issues, newsletters_update_issue, or other issue-related siblings. The singular "One issue" implies retrieval after listing, but the description leaves selection to inference.

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