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

Annotations already declare readOnly, idempotent, openWorld, and non-destructive, so the safety profile is covered. The description adds genuinely non-obvious behavior: it re-fetches the live channel on every call and releases older than the ~7-day window will not be found. That retry/freshness caveat is exactly the kind of context annotations cannot convey.

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?

Two sentences, zero waste, with the core action and the accepted input formats front-loaded before the freshness caveat. Every clause 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?

For a single-parameter read tool with no output schema, the description supplies the essentials: what it returns, where the input comes from, and the 7-day availability limit. It could mention auth requirements or error behavior on stale/expired IDs, but nothing critical for correct invocation is missing.

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 100% and the schema already documents that the single parameter accepts a URL or release_id. The description restates dual-format acceptance but adds no syntax, encoding, or fallback guidance beyond the schema and its examples. 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 ('Fetch one specific Business Wire release') and explicitly names the source and the two sibling tools that produce the input (businesswire_latest_releases, businesswire_search_releases). An agent can distinguish this from those siblings without opening any 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?

Clearly implies the usage context: it is for retrieving a single release that a prior businesswire tool returned, and it names those prior tools. It does not spell out when NOT to use it (e.g. for bulk listing use latest/search), but the routing intent is unambiguous.

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