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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description adds genuinely new context beyond that: no cost on testnet ('Free on testnet'), a hard result cap of 5 items, and a 30-day lookback window — all relevant behavioral limits.

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 compact sentence with the cost/model note front-loaded and the payload shape appended as a colon list; nothing is padded. The telegraphic fragment style costs a little readability but wastes no space.

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 carries the return shape (headline, status, date, one source), the result cap, and the time window. What is missing is only the relationship to sibling status tools, which is a minor gap at this complexity.

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% and the only parameter's format is fully documented there, so the baseline is 3. The description's '(last 30 days)' hints that the range is bounded, but it does not clarify what happens if since_date falls outside that window or how the date is interpreted.

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 resource function — 'Recent verified Ledger changes since a date' — and enumerates the returned fields (headline, status, date, one source), so an agent knows this is a changelog/feed query rather than a status lookup like get_status. It does not explicitly name which sibling to prefer, keeping it short of a 5.

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?

Constraints are given ('last 30 days, max 5 items') but there is no when-to-use guidance, no mention of the siblings get_status or get_status_detail, and no criterion for choosing this over them. The agent must infer the use case from the name alone.

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