From thinking-frameworks-skills
Parses Yahoo Fantasy Baseball league state including roster, standings, matchup, FAAB remaining, and free agents from authenticated pages via Claude-in-Chrome automation, normalizes against config files into shared state for agents.
npx claudepluginhub lyndonkl/claude --plugin thinking-frameworks-skillsThis skill uses the workspace's default tool permissions.
- [Example](#example)
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Scenario: Morning brief run on 2026-04-17. Coach needs current roster, matchup, FAAB, and standings before launching lineup-optimizer.
Inputs read first:
~/Documents/Projects/yahoo-mlb/context/league-config.md (league ID 23756, team 5, 12 teams, 5x5 cats)~/Documents/Projects/yahoo-mlb/context/team-profile.md (prior known roster skeleton)Chrome navigation sequence (authenticated):
https://baseball.fantasysports.yahoo.com/b1/23756/5 — roster with today's opponents per playerhttps://baseball.fantasysports.yahoo.com/b1/23756?lhst=stand — standings + category rankshttps://baseball.fantasysports.yahoo.com/b1/23756/matchup — this week's head-to-head vs Los Doyershttps://baseball.fantasysports.yahoo.com/b1/23756/transactions — FAAB spent to date → remaininghttps://baseball.fantasysports.yahoo.com/b1/23756/players?status=A — top free agents (page 1)Extracted bundle:
| Field | Value |
|---|---|
| Record | 8-6-1 |
| Rank | 5 of 12 |
| FAAB spent | $14 |
| FAAB remaining | $86 |
| This week opp | Los Doyers |
| Live matchup score | 4-3-3 (us leading R, HR, K; losing OBP, ERA, WHIP) |
| Roster returned | 26 of 26 slots populated |
| Free agents top-20 | captured for waiver-analyst |
Outputs written:
context/team-profile.md — roster snapshot updated in place (slot, player, MLB team, today's opp, status)signals/2026-04-17-league-state.md — signal file with YAML frontmatter, source_urls, confidenceEvery downstream agent (lineup-optimizer, waiver-analyst, category-strategist) now reads this signal file and team-profile.md rather than re-scraping Yahoo.
Copy this checklist and track progress:
League State Reader Progress:
- [ ] Step 1: Read context files (league-config.md + team-profile.md)
- [ ] Step 2: Pull Yahoo pages via Claude-in-Chrome (5 URLs)
- [ ] Step 3: Parse roster, standings, matchup, FAAB, free agents
- [ ] Step 4: Update team-profile.md in place
- [ ] Step 5: Emit signal file with frontmatter + source_urls
Step 1: Read context files
Load the authoritative contract and the last known state before touching Yahoo. This both verifies the league ID/URL and provides the skeleton to diff against.
~/Documents/Projects/yahoo-mlb/context/league-config.md — confirm league ID 23756, team 5, roster shape (C/1B/2B/3B/SS/3OF/2UTIL/3SP/2RP/5P/3BN/3IL = 26), FAAB budget $100~/Documents/Projects/yahoo-mlb/context/team-profile.md — capture prior FAAB remaining, prior roster for diff~/Documents/Projects/yahoo-mlb/context/frameworks/signal-framework.md — confirm signal file format~/Documents/Projects/yahoo-mlb/context/frameworks/data-sources.md — confirm the 5 Yahoo URLsStep 2: Pull Yahoo pages via Claude-in-Chrome
The user is already authenticated in the browser. Navigate in order; parse page text; if any step fails, jump to Degraded Mode for that specific URL only (do not abort the whole run). See resources/methodology.md for the exact tool-call sequence and page-parsing patterns.
https://baseball.fantasysports.yahoo.com/b1/23756/5https://baseball.fantasysports.yahoo.com/b1/23756?lhst=standhttps://baseball.fantasysports.yahoo.com/b1/23756/matchuphttps://baseball.fantasysports.yahoo.com/b1/23756/transactionshttps://baseball.fantasysports.yahoo.com/b1/23756/players?status=AStep 3: Parse and normalize
Extract structured data from each page. See resources/methodology.md for row-level parsing logic, and resources/methodology.md for how to reconstruct FAAB remaining from the transactions log.
{slot, player, mlb_team, opp_today, status: active|IL|DTD|NA|BN}-$N entries from transactions history this season; remaining = $100 - total spentStep 4: Update team-profile.md in place
See resources/template.md for the exact output shape. Overwrite the existing file (not append); this file is meant to always reflect "as of the latest run."
## As of YYYY-MM-DDStep 5: Emit signal file
Write ~/Documents/Projects/yahoo-mlb/signals/YYYY-MM-DD-league-state.md with YAML frontmatter per the signal framework. Every URL navigated must appear in source_urls. Degraded fetches drop confidence to 0.5; full-failure fields drop to 0.3 and are flagged. See resources/template.md.
type: league-state, date, emitted_by: mlb-league-state-reader, confidence, source_urls[]mlb-signal-emitter before writing (if that skill is available in this run); otherwise write directlyChrome can fail for several reasons: tab not open, session expired, Yahoo rate-limiting, 500 error, unreadable DOM. Never abort the whole run. Fail gracefully per-URL.
Per-URL fallback decision tree:
| Failure | Fallback |
|---|---|
| Navigation error / timeout | Retry once. If still failing, ask user: "Paste the contents of {URL} and I'll parse from that." |
| Session expired (login page returned) | Ask user: "Please log into Yahoo in your Chrome tab, then say 'retry'." Do not attempt to re-authenticate. |
| Page loads but parse fails (unknown layout) | Dump the first ~4000 chars of get_page_text into the signal file under raw_capture: and drop confidence to 0.4 for that field. |
| Free-agents page gated / empty | Mark free_agents: [] and flag in the signal. The waiver-analyst can still run on roster + standings. |
| Transactions page gated | Ask user: "What's your FAAB remaining right now? Visible at the top of the transactions page." Accept user value; mark faab_confidence: 0.6. |
User-paste template (reuse for any Yahoo page):
"I couldn't reach
{URL}. Please copy the visible table on that page (select all, paste into chat) and I'll extract the fields I need from your paste."
Parse the pasted text with the same regex/row patterns as the live page. See resources/methodology.md.
Never assume the roster is still what it was yesterday. Waivers clear daily and trades can fire any time. Always re-read the Yahoo team page at the start of every run, even if team-profile.md looks fresh.
FAAB remaining is derived, not displayed. Yahoo's UI sometimes shows "FAAB Balance" and sometimes doesn't. The authoritative computation is: $100 minus sum of all winning bids on the transactions page this season. Do not trust a single visible number over the ledger.
Cite every URL. The signal file's source_urls: list must contain every Yahoo page actually visited. If a page was skipped because of degradation, note it in the signal body, not silently.
Do not re-scrape downstream. Once this skill has emitted today's league-state signal, lineup-optimizer / waiver-analyst / category-strategist MUST read that signal rather than re-visit Yahoo. Re-scraping wastes tokens and risks drift.
Overwrite team-profile.md; append nowhere. This file is "current state." Preserving yesterday's roster pollutes it. The append-only log lives in tracker/decisions-log.md, not here.
Status values are normalized enums. Map Yahoo's labels (P, DTD, IL-10, IL-60, NA, SUSP) to the normalized enum: active | BN | IL | DTD | NA | SUSP. Downstream agents branch on the enum, not Yahoo's strings.
Today's opponent may be blank. Off-days, postponements, and doubleheaders all produce unusual opp_today values. Record exactly what Yahoo shows (@TEX, TEX, Off, PPD, DH1/DH2) — do not normalize away information the downstream lineup-optimizer needs.
Don't emit a signal with zero source URLs. If every page failed, write an empty-body signal with confidence: 0.0 and a prominent note to the coach: "Could not reach Yahoo — paste or retry required before any downstream agent runs."
The five Yahoo URLs (from context/frameworks/data-sources.md):
Team: https://baseball.fantasysports.yahoo.com/b1/23756/5
Standings: https://baseball.fantasysports.yahoo.com/b1/23756?lhst=stand
Matchup: https://baseball.fantasysports.yahoo.com/b1/23756/matchup
Transactions: https://baseball.fantasysports.yahoo.com/b1/23756/transactions
Free agents: https://baseball.fantasysports.yahoo.com/b1/23756/players?status=A
Chrome tool order (load via ToolSearch first, then call):
1. mcp__claude-in-chrome__tabs_context_mcp (confirm active tab, auth state)
2. mcp__claude-in-chrome__navigate (go to URL)
3. mcp__claude-in-chrome__get_page_text (extract DOM text)
4. mcp__claude-in-chrome__read_page (structured read if text fails)
Roster slot order (for team-profile YAML; matches league-config.md):
C, 1B, 2B, 3B, SS, OF, OF, OF, UTIL, UTIL, SP, SP, SP, RP, RP, P, P, P, P, P, BN, BN, BN, IL, IL, IL
Status enum mapping:
| Yahoo | Normalized |
|---|---|
| (blank) / P | active |
| BN | BN |
| DTD | DTD |
| IL-10 / IL-60 / IL | IL |
| NA | NA |
| SUSP | SUSP |
Signal frontmatter (minimum fields):
---
type: league-state
date: 2026-04-17
emitted_by: mlb-league-state-reader
variant_synthesis: false
confidence: 0.9
source_urls:
- https://baseball.fantasysports.yahoo.com/b1/23756/5
- https://baseball.fantasysports.yahoo.com/b1/23756?lhst=stand
- https://baseball.fantasysports.yahoo.com/b1/23756/matchup
- https://baseball.fantasysports.yahoo.com/b1/23756/transactions
- https://baseball.fantasysports.yahoo.com/b1/23756/players?status=A
---
Key resources:
Inputs required:
context/league-config.md (league ID, team ID, roster shape)context/team-profile.md (prior state, may be stub)Outputs produced:
context/team-profile.md (overwrite; reflects today's state)signals/YYYY-MM-DD-league-state.md (with frontmatter + source_urls)