List supported sports with their leagues and current season. Returns each sport's id, slug, name, team-sport flag, and its leagues (each with its current_season). Use list_seasons with current_only=false for historical seasons.
| Name | Required | Description | Default |
|---|---|---|---|
| active_only | No | When true (default), omit sports with no active coverage. |
| Name | Required | Description | Default |
|---|---|---|---|
| total | No | ||
| sports | No |
Changes observed during successful MCP inspections.
Input schema / properties / active_only / descriptionAdded value: +"When true (default), omit sports with no active coverage."Output schema / (root)Previous value: -nullNew value: +{
+ "properties": {
+ "sports": {
+ "items": {
+ "properties": {
+ "id": {
+ "type": "integer"
+ },
+ "is_team_sport": {
+ "type": "boolean"
+ },
+ "leagues": {
+ "items": {
+ "properties": {
+ "current_season": {
+ "type": [
+ "object",
+ "null"
+ ]
+ },
+ "id": {
+ "type": "integer"
+ },
+ "name": {
+ "type": "string"
+ },
+ "slug": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+ },
+ "type": "array"
+ },
+ "name": {
+ "type": "string"
+ },
+ "slug": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+ },
+ "type": "array"
+ },
+ "total": {
+ "type": "integer"
+ }
+ },
+ "type": "object"
+}Input schema / properties / active_only / descriptionRemoved value: -"When true (default), omit sports with no active coverage."Output schema / (root)Previous value: -{
- "properties": {
- "sports": {
- "items": {
- "properties": {
- "id": {
- "type": "integer"
- },
- "is_team_sport": {
- "type": "boolean"
- },
- "leagues": {
- "items": {
- "properties": {
- "current_season": {
- "type": [
- "object",
- "null"
- ]
- },
- "id": {
- "type": "integer"
- },
- "name": {
- "type": "string"
- },
- "slug": {
- "type": "string"
- }
- },
- "type": "object"
- },
- "type": "array"
- },
- "name": {
- "type": "string"
- },
- "slug": {
- "type": "string"
- }
- },
- "type": "object"
- },
- "type": "array"
- },
- "total": {
- "type": "integer"
- }
- },
- "type": "object"
-}New value: +nullOutput schema / properties / sports / items / properties / leagues / items / properties / current_season / typePrevious value: -"object"New value: +[
+ "object",
+ "null"
+]Input schema / properties / active_only / descriptionAdded value: +"When true (default), omit sports with no active coverage."Output schema / (root)Previous value: -nullNew value: +{
+ "properties": {
+ "sports": {
+ "items": {
+ "properties": {
+ "id": {
+ "type": "integer"
+ },
+ "is_team_sport": {
+ "type": "boolean"
+ },
+ "leagues": {
+ "items": {
+ "properties": {
+ "current_season": {
+ "type": "object"
+ },
+ "id": {
+ "type": "integer"
+ },
+ "name": {
+ "type": "string"
+ },
+ "slug": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+ },
+ "type": "array"
+ },
+ "name": {
+ "type": "string"
+ },
+ "slug": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+ },
+ "type": "array"
+ },
+ "total": {
+ "type": "integer"
+ }
+ },
+ "type": "object"
+}Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only and non-destructive behavior. The description adds useful context about the returned data structure (sport id, slug, name, team-sport flag, leagues with current_season) that is not redundant with the output schema, and it clarifies the tool's scope beyond the hints.
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?
Two sentences: the first leads with the action and key outcome, the second details return fields and the alternative for historical data. Every sentence earns its place with no redundancy or filler.
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?
Given the single optional parameter, rich annotations, and presence of an output schema, the description fully covers the tool's purpose, return shape, and related tool guidance. No important gaps remain for a simple list operation.
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 input schema already provides a full description for active_only (100% coverage), so the schema does the heavy lifting. The description does not add additional parameter meaning beyond what is in the schema, meeting the baseline for high schema coverage.
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 description clearly states the tool lists supported sports with their leagues and current season, naming the exact fields returned. It distinguishes from sibling tools by explicitly pointing to list_seasons for historical seasons, and the scope (sports vs teams/events) is unambiguous.
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?
Provides explicit guidance to use list_seasons with current_only=false for historical seasons, which is a clear alternative. Does not enumerate all when-not-to-use scenarios, but the primary use case is evident and the alternative is well-targeted.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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