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

No annotations are provided, so the description carries the full burden and does so: it discloses dedup behavior ('a later modification of an award you were already alerted to does not alert again'), the no-history-replay rule, that each alert's data has KeyVex internal `_` fields stripped, pagination via next_cursor, and the full webhook contract (HMAC signature over '<timestamp>.<raw body>', 5-minute replay window, no redirects, 5s 2xx deadline).

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 first sentence front-loads the core identity and the kind list follows immediately, with eligibility and webhook rules after. It is dense but nearly every clause carries operational meaning; the webhook paragraph is the only slightly tangential block for a read/polling 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?

Despite having no output schema, the description explains the shape of the returned `data` (the source record as stored, internal fields removed) and the pagination token, and it clarifies authentication scope (the API key determines whose watchlist) and where the watchlist is managed. Nothing an agent needs to call this correctly 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 coverage is 100%, so the baseline is 3, but the prose goes beyond it: it enumerates and defines each enum value for `kind` (congress_trade, initial_13d, federal_contract) and confirms cursor usage ('Paginate with next_cursor'). The semantics of `since` and `limit` are left to the schema.

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 ('Your watchlist alerts, newest first') and scopes it precisely to events matched against the tickers, members and UEIs on YOUR watchlist for the calling API key. It distinguishes itself from raw-data siblings by noting 'the matching tool may present the same record differently,' so an agent knows this is the alert feed, not get_congressional_trades or get_federal_contracts.

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?

Explains what each of the three kinds means and states the eligibility condition (event date within 7 days of detection and not before the entry was added), which tells the agent exactly when results appear. It implies the raw-source alternatives ('the matching tool may present the same record differently') but never explicitly says when to prefer those over this feed, so it falls short of full when/when-not routing.

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