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

Annotations already cover the safety profile (readOnly, idempotent, non-destructive, closed-world), so the bar is lower. The description still adds value by disclosing what the result contains (status and links) and that results are scoped to the caller's own account, which matters given no output schema 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 compact sentences, zero filler, with the core action stated first and the usage constraint immediately after. Nothing is repeated from the title or schema.

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 single-parameter read tool with full schema coverage, the description covers purpose, trigger, exclusion, and return content. Without an output schema the return description ('status and links') is doing real work, though pagination/ordering beyond newest-first is not mentioned.

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 optional parameter and schema coverage is 100% — the schema already documents 'limit' including the default of 10 and the newest-first ordering. The description adds nothing beyond that, 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?

States a specific verb and resource ('Lists the account's earlier press releases') and goes further by naming what is returned — status and links. The scope word 'earlier' separates it from the draft/publish siblings, though the exact boundary between 'earlier' and current releases is left implicit.

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?

Explicit trigger ('Only when the user asks about their earlier releases') paired with an explicit exclusion ('Not needed to draft or publish a new one'), which routes the agent away from create_release and publish_release without it having to inspect those schemas.

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