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

Annotations already declare readOnly=true, idempotent=true, destructive=false, openWorld=false, so the safety profile is covered. The description adds genuinely useful non-structured context: it costs no Toolweather quota and no webhook, and it returns that issue's summary and items. It stops just short of noting freshness/update cadence beyond 'once a day'.

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 tight sentences with zero filler; the purpose is front-loaded, then usage routing, then the cost/return note. Every sentence carries information an agent needs to select and call the tool.

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 read-only tool with one optional parameter and no output schema, the description covers what it returns, what it costs, and how to get the latest issue. Nothing material is missing for correct invocation.

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 already spells out the UTC YYYY-MM-DD format, the omit-for-latest default, and that it is not a timestamp or range. The description's 'Omit date for the latest issue' merely restates the schema, so it adds little beyond the baseline 3.

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 (Read) and resource (one daily digest) and enumerates its contents: incidents, model retirements, pricing-page edits, breaking MCP changes. It explicitly names the sibling it is not (list_recent_api_changes, check_api_status), so it is distinguishable 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?

Gives explicit positive guidance ('Use once a day instead of polling list_recent_api_changes') and explicit exclusions with the correct alternatives for a live check and a filtered feed. Both when-to-use and when-not-to-use are covered, including the omit-date shortcut for the latest issue.

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