What is fantasy-baseball?

A Yahoo Fantasy Baseball assistant for reviewing teams, changing lineups, evaluating players, and checking weekly results.

Use it to review your teams, decide who to start, consider adds and drops, grade a week, check team status, or see whether you can still win the current week.

It gathers the league, roster, matchup, standings, and player information needed to make fantasy-baseball decisions in one workflow.

fantasy-baseball — Skill for Claude Code and Codex by dingyiyi0226

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add dingyiyi0226/fantasy-baseball-mcp --skill fantasy-baseball

Clone the repo

git clone --depth 1 https://github.com/dingyiyi0226/fantasy-baseball-mcp

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/dingyiyi0226/fantasy-baseball-mcp/fantasy-baseball/github.svg)](https://agentmods.dev/skills/dingyiyi0226/fantasy-baseball-mcp/fantasy-baseball)

Your own site

<a href="https://agentmods.dev/skills/dingyiyi0226/fantasy-baseball-mcp/fantasy-baseball"><img src="https://agentmods.dev/badge/skills/dingyiyi0226/fantasy-baseball-mcp/fantasy-baseball/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/dingyiyi0226/fantasy-baseball-mcp/fantasy-baseball"><img src="https://agentmods.dev/badge/skills/dingyiyi0226/fantasy-baseball-mcp/fantasy-baseball.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,231 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00078	$0.01231
Opus 5.5	$0.00031	$0.00492
Sonnet 5.5	$0.00016	$0.00246
Haiku 4.5	$0.00008	$0.00123

Measured 2mo ago against content hash 0b13cf14e384, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fantasy-baseball scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/fantasy-baseball/SKILL.md · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fantasy Baseball

This skill is the top-level router for the repo's Yahoo fantasy baseball review workflows. Keep the public trigger surface stable here, and move the detailed procedure for each workflow into a dedicated tool reference so we can add more tools over time without bloating this file.

Read references/browser-control.md before reading from or writing to Yahoo. Read references/tool-notes.md before calling the public baseball-analysis tools. Read references/subagent-delegation.md when subagents are available for a review or Yahoo action.

Available Tools

Browser Yahoo data

Use the signed-in Yahoo browser for every league-specific read:

account, league, and team discovery
settings, scoring categories, standings, and roster capacity
rosters, team stats, scoreboards, and matchup history
player search, availability, rankings, and transaction history

Load the page-family reference needed for the request:

references/browser-discovery-league.md
references/browser-roster-matchup.md
references/browser-players-transactions.md

Do not use the Yahoo Fantasy API. If the selected browser is not signed in to Yahoo, stop and ask the user to sign in there.

`daily-roster-review`

Use this tool for the current day-to-day roster review flow:

matchup scoreboard vs opponent
opponent pressure check
start/sit recommendations with exact slot changes
add/drop targets and streamer ideas
lineup adjustments delegated to adjust-lineup by default; add/drop stays manual by default

When the user asks for fantasy roster review, daily fantasy review, start/sit help, lineup moves, waiver targets, or general team-status advice, load references/daily-roster-review.md and follow that workflow.

`weekly-review`

Use this tool for a management post-mortem on the current or a just-finished scoring week:

category outcome vs. opponent, including in-progress weeks
move-by-move timeline of adds/drops/lineup calls, graded on process vs. result
opponent management comparison (lineup cleanliness, streamer usage, add/drop efficiency)
missed opportunities (IL/NA misuse, unused streams, missed saves chases)
for an in-progress week that is currently being lost: whether a realistic comeback is still possible with the best plausible management from here, not hindsight luck
a scorecard grading category strategy, adds/drops, daily lineup handling, and IL/NA management

Read the full file on GitHub · 113 lines

Files

What ships with it

10 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 113 lines · 78 tokens per session scan A 0b13cf14e384

Subscribe to this mod's changes

fantasy-baseball is a skill published in the GitHub repository dingyiyi0226/fantasy-baseball-mcp (0 stars, last pushed 2mo ago), licensed MIT. It adds 78 tokens to every session and 1,231 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Analytics and metrics claude fantasy-baseball fantasy-sports mcp mcp-server yahoo-fantasy

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