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

With readOnlyHint and openWorldHint already declared, the description adds genuinely new context: provenance (the Flashscore page feed), the state coverage including live periods and postponed/cancelled, and the pricing/billing model where only successful calls cost $0.002 via x402. It stops short of discussing result volume or pagination beyond what the limit parameter implies.

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 scope and output fields, followed by the sport list, provenance and pricing. Dense but every sentence carries information; the pricing clause is slightly detachable but justified for a paid endpoint.

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 paid, read-only, open-world listing tool with an output schema and full parameter documentation, the description covers scope, source, state semantics and billing failure policy. Nothing an agent needs before calling it 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%, so every parameter including day range, team/league substring filters, limit and status is already documented. The description only echoes the one-sport-one-day framing, adding no syntax, defaults or interaction rules beyond 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 ('Flashscore match list for one sport and day') plus the exact payload returned (ID, competition, start time, teams, score, state). This clearly distinguishes it from sibling scoreboard/odds tools such as dev_sofascore_live or dev_espn_soccer_scoreboard.

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 7-days-back-to-7-ahead window and the enumerated sport list set clear boundaries for when this tool applies, and mentioning it reads the feed the Flashscore web page loads tells the agent it is a broad multi-sport listing. It does not name an alternative tool or state exclusions, so it falls short of a 5.

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