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Get Trending Players (platform-wide adds/drops)

fantasy_get_trending_players
Read-onlyIdempotent

The most-added or most-dropped players across all of Sleeper right now ("who's trending", "who's everyone adding/dropping"). Sleeper platform-wide data ONLY: not league-specific or availability-aware, so for players you can actually add in YOUR league use fantasy_get_available_players.

Input Schema

NameRequiredDescriptionDefault
limitNoMax players.
sportYese.g. 'NFL', 'NBA'. Needed for ESPN/Sleeper and Fantrax name lookups.
providerNoFantasy platform. Optional: defaults to your connected platform ('sleeper').
directionNo'add' = most added, 'drop' = most dropped.add
credentialsNoOnly WITHOUT a connected profile: secret_id (Fantrax), espn_s2 + swid (private ESPN), username or user_id (Sleeper discovery). Public ESPN and Sleeper reads need none.
lookback_hoursNoLookback window in hours.
response_formatNo'markdown' (default, most compact) or 'json' (same normalized data, not the raw payload).markdown

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / credentials / additionalProperties
      Previous value: -trueNew value: +{}
  2. Changed5 schema fields changed
    • changedInput schema / properties / credentials / description
      Previous value: -"Per-call credentials, only needed WITHOUT a connected profile. Keys: secret_id (Fantrax); espn_s2 + swid (private ESPN leagues); username or user_id (Sleeper discovery); session_cookie / auth_token + write_enabled:true (explicit write opt-in only). Public ESPN leagues and all Sleeper reads need none."New value: +"Only WITHOUT a connected profile: secret_id (Fantrax), espn_s2 + swid (private ESPN), username or user_id (Sleeper discovery). Public ESPN and Sleeper reads need none."
    • changedInput schema / properties / limit / description
      Previous value: -"Max players (1-100)."New value: +"Max players."
    • changedInput schema / properties / lookback_hours / description
      Previous value: -"Lookback window in hours (default 24)."New value: +"Lookback window in hours."
    • changedInput schema / properties / response_format / description
      Previous value: -"'markdown' (default) or 'json' (raw payload)."New value: +"'markdown' (default, most compact) or 'json' (same normalized data, not the raw payload)."
    • changedInput schema / properties / sport / description
      Previous value: -"Sport, e.g. 'NFL', 'NBA', 'MLB', 'NHL'. Required for ESPN/Sleeper and Fantrax name lookups."New value: +"e.g. 'NFL', 'NBA'. Needed for ESPN/Sleeper and Fantrax name lookups."
  3. Changed11 schema fields changed
    • changedInput schema / properties / credentials / additionalProperties
      Previous value: -falseNew value: +true
    • changedInput schema / properties / credentials / description
      Previous value: -"Per-call credentials. Fill only the keys your provider needs (see fantasy_list_providers). Public ESPN leagues and all Sleeper reads need none."New value: +"Per-call credentials, only needed WITHOUT a connected profile. Keys: secret_id (Fantrax); espn_s2 + swid (private ESPN leagues); username or user_id (Sleeper discovery); session_cookie / auth_token + write_enabled:true (explicit write opt-in only). Public ESPN leagues and all Sleeper reads need none."
    • removedInput schema / properties / credentials / properties / espn_s2
      Removed value: -{
-  "description": "ESPN private-league cookie 'espn_s2' (DevTools → Application → Cookies → espn.com).",
-  "type": "string"
-}
    • removedInput schema / properties / credentials / properties / secret_id
      Removed value: -{
-  "description": "Fantrax Secret ID (User Profile → 'Your Secret ID').",
-  "type": "string"
-}
    • removedInput schema / properties / credentials / properties / swid
      Removed value: -{
-  "description": "ESPN private-league cookie 'SWID': a GUID in curly braces, e.g. {XXXX-...}.",
-  "type": "string"
-}
    • removedInput schema / properties / credentials / properties / user_id
      Removed value: -{
-  "description": "Sleeper numeric user_id (alternative to username).",
-  "type": "string"
-}
    • removedInput schema / properties / credentials / properties / username
      Removed value: -{
-  "description": "Sleeper username (for league discovery).",
-  "type": "string"
-}
    • changedInput schema / properties / provider / description
      Previous value: -"Fantasy platform: 'fantrax', 'espn', or 'sleeper'. Call fantasy_list_providers first to see each provider's capabilities and required credentials."New value: +"Fantasy platform. Optional: defaults to your connected platform ('sleeper')."
    • changedInput schema / properties / response_format / description
      Previous value: -"Output format: 'markdown' (default, human-readable) or 'json' (raw upstream payload)."New value: +"'markdown' (default) or 'json' (raw payload)."
    • changedInput schema / properties / sport / description
      Previous value: -"Sport, e.g. 'NFL', 'NBA', 'MLB', 'NHL'. Required for ESPN/Sleeper and for Fantrax player/name lookups."New value: +"Sport, e.g. 'NFL', 'NBA', 'MLB', 'NHL'. Required for ESPN/Sleeper and Fantrax name lookups."
    • changedInput schema / required
      Previous value: -[
-  "provider",
-  "sport"
-]New value: +[
+  "sport"
+]
  4. First observed

TDQS

A4.4/5.0
Behavior4/5

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

Annotations already declare read-only, idempotent, open-world, non-destructive, so the description doesn't need to re-state safety. It adds genuine behavioural context the annotations can't carry: the data is Sleeper platform-wide only, not league-scoped or availability-aware, and reflects a current snapshot ("right now"). It stops short of mentioning freshness/lookback behaviour or response shape, which would have earned a 5.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences, zero filler, with the scope constraint front-loaded before the alternative tool redirect. Every clause earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 7-parameter read tool with a nested credentials object and no output schema, the description conveys the data source, scope limits and result kind (most-added/most-dropped) — enough to call it correctly. It could say more about ordering/ranking and what the rows contain, but the schema already covers credential and provider handling.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, including enums for direction, provider and response_format and defaults for limit/lookback_hours, so the schema carries all parameter meaning. The description adds no syntax, format or default detail beyond that. Baseline 3 is correct.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource — the most-added or most-dropped players platform-wide — and immediately frames it with recognisable user phrasings ("who's trending"). It explicitly names the sibling tool fantasy_get_available_players as the different case, so an agent can distinguish the two without reading schemas.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives an explicit when-to-use condition ("who's everyone adding/dropping") and an explicit when-NOT-to-use plus redirect ("for players you can actually add in YOUR league use fantasy_get_available_players"). No inference required.

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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