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

Beyond the readOnly/idempotent/openWorld annotations, the description adds genuinely useful behavior: no authentication required, affiliate 27 excluded, empty results are not evidence of missing coverage, and no background polling or automatic retry. The garbled fragment 'Read-only Product data or price calculation' is noise, but the rest meaningfully extends the annotations.

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 text is a single run-on string with no sentence boundaries, mixing purpose, auth, affiliate exclusion, retry policy, and disclaimers ('No wagers, account changes or guarantee of returns') that are irrelevant to a read-only sports list. The garbled 'Read-only Product data or price calculation' fragment further harms readability.

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?

An output schema exists, so return values need no explanation, and the description covers auth requirements, ID usage, and the empty-result caveat. For a zero-parameter read tool it is largely complete, held back only by the jumbled presentation.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate and the baseline of 4 applies. The mention of canonical IDs is about output, not input semantics.

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 opening clause 'List all sports Returns all available sports with their IDs' states a specific verb and resource, and the ID detail helps. It does not, however, distinguish this tool from near-identically named siblings like v1GetSports and list_sports, which an agent must disambiguate on its own.

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?

'Use returned canonical IDs' implies the downstream consumption pattern, which is useful. But there is no explicit when-to-use guidance or comparison against the v1GetSports/list_sports alternatives that clearly overlap, leaving selection to inference.

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