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

Annotations already declare readOnly/idempotent/non-destructive, so the safety bar is low, yet the description adds real behavioral context beyond them: the returned link hands the user to Bettrails, requires confirmation with a free account (auto-created if needed), and Bettrails itself delivers the notifications. That external-flow disclosure is exactly what an agent needs and is not in the structured fields.

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?

Front-loaded with the purpose, then the kinds, then the flow — a sensible order. The kinds sentence is dense and slightly run-on, but every clause conveys required parameter combinations or timing semantics that earn their 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 7-parameter, no-output-schema tool with enum-heavy params, the description covers purpose, per-kind required inputs, timing behavior, and the post-link user flow. The only real gap is the unmentioned language parameter and the exact shape of the returned link, both minor.

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?

At 57% schema coverage the description does meaningful work: it maps which parameters belong to which kind (esoccer_duel = league + player1 + player2; basket_duel = league nba|euro|ggl + player1 + player2; esports_team = game + team), which the schema only states generically. It omits the `language` parameter entirely, leaving that one to the schema description.

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?

The first sentence states a precise verb+resource+outcome: 'Get a link so Bettrails notifies the user before a match starts.' It is instantly distinguishable from siblings like esoccer_head_to_head, esoccer_player, read_page and search, which have no notification-subscription behavior.

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?

The description explains the conditions that select each mode (esoccer_duel fires ~10 min before next duels, esports_team fires 1 hour before each match plus the result), giving clear usage context. It does not, however, explicitly say when to prefer this tool over the sibling head-to-head or player tools it overlaps with.

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