Yahoo Fantasy Baseball#

Query your Yahoo Fantasy Baseball league: view data and optimize your daily lineup via the Yahoo Fantasy Sports API. Read-only — no roster modifications are made.

Requirements#

• Python 3.10+
• yahoo_fantasy_api — Yahoo Fantasy Sports API wrapper

Installation: Before first use, run --setup to create a local .deps/ virtual environment and install dependencies from requirements.txt. Subsequent runs reuse the existing venv. To force a clean reinstall, delete the .deps/ directory and run --setup again.

bash

python3 yahoo-fantasy-baseball.py --setup

Setup#

1. Create a Yahoo Developer App#

1. Go to https://developer.yahoo.com/apps/
2. Click "Create an App"
3. Set Redirect URI to oob (out-of-band — Yahoo displays the auth code on screen instead of redirecting to a URL)
4. Copy the Consumer Key and Consumer Secret

2. Authenticate#

bash

python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py auth

Follow the prompts to enter your Consumer Key and Secret. A browser window opens for Yahoo OAuth authorization. Tokens are cached automatically — you only need to do this once.

3. Find Your League#

bash

python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py leagues

4. Set Defaults#

bash

python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py config --league 12345

The skill auto-detects your team within the league. You can also set it explicitly:

bash

python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py config --league 12345 --team 3

Quick Start#

bash

# View your roster
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py roster

# Daily roster status (who's playing, who's off)
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py today

# Roster status for a specific date
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py day --date 2026-03-25

# Get optimization suggestions
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py optimize

# League standings
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py standings

Commands#

Data Commands (Read)#

bash

# Auth & Config
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py auth
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py config --league 12345 --team 3 --season 2026
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py config

# Leagues & Teams
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py leagues [--season YEAR]
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py teams

# Roster & Lineup
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py roster [--date YYYY-MM-DD]
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py lineup [--week N]

# Standings & Matchups
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py standings
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py matchup [--week N]
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py scoreboard [--week N]

# Players & Draft
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py players [--search NAME] [--position POS] [--status FA|A|T|W|ALL] [--sort OR|AR|PTS|NAME|HR|ERA|...] [--sort-type season|lastweek|lastmonth] [--stat-season YEAR] [--count N]
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py draft [--team ID]
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py transactions [--type add,drop,trade] [--since 3d]
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py injuries

# Lineup Check — confirmed MLB lineups vs fantasy roster
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py lineup-check [--date YYYY-MM-DD]

Daily Management#

bash

# Today: roster status with MLB schedule awareness (shortcut for 'day' with today's date)
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py today

# Day: roster status for a specific date
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py day --date 2026-03-25

Groups your roster into ACTIVE (team playing), NOT PLAYING (team off), INJURED, and BENCH. Shows each player's eligible positions, game start times (local timezone), and flags probable starting pitchers. Displays "First pitch" time at the top so you know when to finalize your lineup. The today command is a shortcut for day with today's date.

bash

# Standouts: yesterday's top performers across all league teams
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py standouts [--date YYYY-MM-DD] [--min-points N] [--count N]

Fetches daily player stats for all rostered players across every team in the league and identifies standout performances. Output is split into two sections:

1. Top Performers — players in active lineup slots who scored the most fantasy points
2. Left on the Bench — benched players with notable performances (points that didn't count)

Each player shows their fantasy points, key stat line, and achievement badges (e.g., "Multi-HR", "10+ K", "Gem", "CGSO"). Defaults to yesterday; use --date for a specific date.

bash

# Lineup check: verify active players are in confirmed MLB lineups
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py lineup-check
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py lineup-check --date 2026-04-01

Cross-references active fantasy roster players against confirmed MLB batting lineups (from MLB Stats API hydrate=lineups). Flags position players who are in a starting fantasy slot but NOT in their team's confirmed real-life lineup (e.g., scratched, resting, benched vs lefty/righty). Pitchers are excluded (they don't appear in batting lineups). Players whose team's lineup hasn't been posted are NOT flagged — only players whose lineup IS posted and who are absent. Lineups are typically posted 1-3 hours before game time.

bash

# Optimize: smart roster analysis with suggestions
python3 /home/claw/.openclaw/workspace/skills/yahoo-fantasy-baseball/yahoo-fantasy-baseball.py optimize

Three analysis categories:

1. Lineup changes — optimal batter assignment via constraint solver (position-aware, fills restrictive slots before UTIL). Outputs grouped swap instructions showing who starts (from bench), who gets benched, and any intermediate position reshuffles needed within that chain (e.g., a UTIL player sliding to 1B to make room). Pure position shuffles among active slots (without bench involvement) are omitted. Also checks confirmed MLB batting lineups — players confirmed not in their team's lineup are treated as unavailable (score 0) and will be moved to bench. Players whose games have already started are locked in place (Yahoo locks roster slots at first pitch) and excluded from the solver.
2. Pitcher rotation — priority-based pitcher slot optimization with swap suggestions. Probable starters get highest priority, then relief pitchers whose teams are playing. A starter-only arm who is not today's probable starter is treated as worth nothing — his team having a game is irrelevant, because he won't take the mound — so he ranks alongside pitchers whose teams are off. When nobody in contention can appear today, the pitcher already holding the slot keeps it rather than being swapped for another idle arm with better season numbers. Outputs grouped swap instructions (same format as batter swaps). Locked games are excluded.
3. IL management — players with IL designations (IL, IL10, IL15, IL60) not in IL slots, cleared players still in IL. DTD players are excluded since Yahoo does not allow moving them to IL.

Each move includes team, opponent, score, and (when set) Yahoo injury status (e.g. DTD, IL10) inline in the parenthetical. If a player suggested to start is DTD, a ⚠️ Day-to-day — confirm in lineup before locking. caution is rendered beneath the line — the optimizer scores ignore status, so a higher-scoring DTD player can still surface as a swap recommendation. Moves to BN may include a reason indicator:

• ⚠️ — player not in confirmed MLB lineup (urgent — they won't play)
• 🔒 — player's game has already started (locked by Yahoo)
• 📅 — player's team is off today

In --format json, every entry in swap_groups[].start, swap_groups[].bench, swap_groups[].reshuffle (and the pitcher equivalents) carries a status field — empty string when the player has no Yahoo status. The flat moves[] and pitcher_moves[] arrays mirror the text view: they include every move that is part of a swap group, each tagged with a swap_group index. A group always moves at least one player to or from the bench. Pure active↔active shuffles (e.g. UTIL → SS with no bench involvement) leave the same set of players in the lineup and therefore cannot change scoring, so they are dropped from both the groups and the flat arrays rather than reported as busywork. A reshuffle leg still appears when it is part of a real bench swap — a UTIL player sliding to 1B to make room for an incoming bench bat.

How players are scored#

Scores run 0–100 and are derived from the league's own scoring categories, read from league.stat_categories() — not a fixed formula. Each category is min-max normalized across the roster pool and the results averaged, so every category carries equal weight, which is how category leagues actually settle. A stat your league does not score contributes nothing.

Two stat windows feed the score:

• Baseline — Yahoo's average_season window, which is already per-game (or a true rate for OBP/ERA/WHIP). Using rates rather than totals means accumulated playing time cannot inflate a score: a part-time or recently-injured star is compared on quality, not on how many at-bats he has banked.
• Recent form — the lastmonth window, weighted at _RECENCY_WEIGHT (default 0.35). Counting stats in this window are divided by AB (batters) or IP (pitchers) to keep them rate-based.

Batters and pitchers are normalized within their own pools, since their categories aren't comparable. Categories where lower is better (ERA, WHIP, BB/9) are inverted. A player with less than 15 AB (or 5 IP) in the recent window falls back to his season rate for that component rather than being penalized for a small sample — this keeps a player just back from the IL from being buried. If the league's categories can't be read at all, scoring falls back to the legacy composite formula.

Early-season preseason rank blending: The optimizer blends Yahoo's preseason overall rank (OR) into player scores during the first weeks of the season, when current-year stats are too small a sample to be reliable. The blending schedule:

• Weeks 1–2: Full weight — preseason rank contributes up to 15 bonus points on the 0–100 scale (rank 1 gets the max, last-ranked gets 0)
• Weeks 3–6: Linear taper — preseason influence decreases by ~20% per week
• Week 7+: Zero weight — scoring is based entirely on current-season stats

This prevents the optimizer from overreacting to small early-season slumps (e.g., benching a star who went 0-for-8 in the first series). The preseason ranks are fetched via one additional Yahoo API call ( sort=OR, status=T) per optimize run.

Common Flags#

FlagDescription--league IDLeague ID (overrides config default)--team IDTeam ID (overrides config/auto-detect)--season YEARSeason year (for historical data)--week NScoring week number--dateSpecific date — accepts MM/DD/YYYY, M/D/YYYY, MM-DD-YYYY, or YYYY-MM-DD (roster, day commands)--format text|json|discordOutput format (default: text)--status FA|A|T|W|ALLPlayer status filter: FA (free agents), A (available=FA+W), T (taken), W (waivers), ALL (every player)--sort OR|AR|PTS|NAME|{stat}Sort order: OR = overall/preseason rank (default), AR = actual/current rank, PTS = points, NAME = alphabetical, or stat abbreviation. See stat sort reference below--sort-type season|lastweek|lastmonthSort period (used with --sort)--stat-season YEARSeason year for stat columns (auto-detects: falls back to previous year if league hasn't started)--since 3d|1w|24h|2wFilter transactions by time window (h=hours, d=days, w=weeks, m=months)

Sort Reference#

Built-in sort modes:

ValueDescriptionOROverall Rank (preseason/projected)ARActual Rank (by real performance)PTSFantasy PointsNAMEAlphabetical

Batting stats:

AbbrevDescriptionRRunsHHits1BSingles2BDoubles3BTriplesHRHome RunsRBIRuns Batted InSBStolen BasesBBWalksKStrikeoutsAVGBatting AverageOBPOn-base PercentageSLGSlugging PercentageOPSOn-base + SluggingABAt BatsPAPlate AppearancesTBTotal BasesXBHExtra Base Hits

Pitching stats:

AbbrevDescriptionWWinsLLossesSVSavesHLDHoldsSV+HSaves + HoldsBSVBlown SavesERAEarned Run AverageWHIPWalks + Hits per Inning PitchedIPInnings PitchedQSQuality StartsK9Strikeouts per 9 InningsBB9Walks per 9 Innings

Output Format#

Text (Default)#

roster:

text

Roster — Team Name
Name                      Pos          Slot  Team   Status
----------------------------------------------------------
Aaron Judge               OF,Util      OF    NYY
Mookie Betts              SS,OF,Util   SS    LAD
Zack Wheeler              SP           IL    PHI    IL-60

today / day:

text

Today — Team Name
  First pitch: 1:10 PM

  ACTIVE (team playing today) (8)
    Aaron Judge            OF,Util        NYY  vs BOS 7:05 PM
    Gerrit Cole            SP             NYY  vs BOS 7:05 PM  [PROBABLE STARTER]

  NOT PLAYING (team off today) (3)
    Mookie Betts           SS,OF,Util     LAD

  BENCH (3)
    Jake Burger            3B,1B,Util     MIA  at ATL 1:10 PM

  INJURED LIST (1)
    Zack Wheeler           SP             PHI                   (IL-60)

optimize:

text

Roster Optimization Suggestions
==================================================

  LINEUP CHANGES (2 swaps)

    Swap 1 — 3B
      ▶ Start Jake Burger (MIA vs ATL, score: 18.3)
      ▼ Bench Josh Smith (TEX vs SEA, score: 9.2)
        ⚠️  not in confirmed MLB lineup

    Swap 2 — SS / UTIL
      ▶ Start Willy Adames at SS (SF vs PHI, score: 35.0)
      ↔ Move Mookie Betts from SS → UTIL
      ▼ Bench Tyler Fitzgerald (SF, score: 12.0)
        📅  team off today

  PITCHER ROTATION (1 swap)

    Swap 1 — P
      ▶ Start Gerrit Cole (NYY vs BOS, score: 42.1) — probable starter today
      ▼ Bench Nathan Eovaldi (TEX vs SEA, score: 39.0)
        💡  not starting today

  IL MANAGEMENT (1 suggested)
    Move Zack Wheeler (IL-60) from SP slot to IL to free a roster spot.

Total: 4 suggestion(s)

Players on teams whose games are already in progress or finished are locked and excluded from optimization — they will not appear in the move list.

scoreboard:

text

League Scoreboard — Week 1
------------------------------------------------------------
  Clanker Killerz                  6  vs  4   1% AI 99% hot gas
                                    In progress

  Mossi Possi                      1  vs  7   Normal Men
                                    In progress

transactions:

text

Recent Transactions
------------------------------------------------------------
add | 1% AI 99% hot gas | Mar 25, 07:38 PM
  Add from Free Agent:Luis Castillo (SEA - SP)

add/drop | 1% AI 99% hot gas | Mar 25, 04:14 AM
  Add from Waivers:   Josh Smith (TEX - 1B,3B,SS,OF)
  Drop:               Luis Robert Jr. (NYM - OF)

JSON#

All commands support --format json for structured output.

Discord#

All commands support --format discord which wraps text output in code blocks.

Output Fields#

• name — Player's full name
• player_id — Yahoo player ID (numeric)
• positions — Eligible fantasy positions (e.g., OF, SP, Util)
• selected_position — Current lineup slot
• team — Real MLB team abbreviation
• status — Injury designation (IL, IL-60, DTD, etc.)
• game_time — Game start time in local timezone (today/day commands)
• first_pitch — Earliest game start time across all games (today/day commands, JSON top-level)
• percent_owned — Ownership percentage (free agents)
• player_position — Display position (draft results)

Limitations#

• Rate limits: Yahoo enforces API rate limits. Avoid rapid-fire requests.
• Season scope: Data is scoped to the configured season. Use --season for historical data.
• OAuth tokens: Tokens auto-refresh but may eventually expire, requiring re-authentication via auth.
• MLB schedule: The today, day, optimize, and lineup-check commands use the MLB Stats API for schedule data (off days, probable pitchers, confirmed batting lineups). This data is not available from the Yahoo Fantasy API.

Credential Storage#

Preferred: Environment variables. Set YAHOO_CONSUMER_KEY and YAHOO_CONSUMER_SECRET via OpenClaw config or your shell environment. The skill will use these automatically — no need to run auth. Note: credentials are still written to oauth2.json on disk because the underlying yahoo_oauth library requires a file for token management. File permissions are set to 0600 on Unix.

Alternative: Interactive setup. Run the auth command to enter credentials interactively. Tokens are stored in ~/.openclaw/credentials/yahoo-fantasy/:

• oauth2.json — OAuth consumer key/secret and tokens (managed by yahoo_oauth, file permissions set to 0600 on Unix)
• yahoo-fantasy.json — Default league_id, team_id, season

Legacy YFPY .env credentials are auto-migrated to oauth2.json on first use.

Notes#

• Data is sourced from the Yahoo Fantasy Sports API via the yahoo-fantasy-api library.
• MLB schedule and probable pitcher data comes from the MLB Stats API (stdlib only, no dependencies).
• Run --setup to create a local venv at .deps/ and install dependencies before first use.
• Auto-detect identifies your team using league.team_key(). If detection fails, use config --team <ID> to set it manually.