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.
npx skills add derekrbreese/fantasy-football-skills --skill league-configgit clone --depth 1 https://github.com/derekrbreese/fantasy-football-skillsWrote 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.
[](https://agentmods.dev/skills/derekrbreese/fantasy-football-skills/league-config)<a href="https://agentmods.dev/skills/derekrbreese/fantasy-football-skills/league-config"><img src="https://agentmods.dev/badge/skills/derekrbreese/fantasy-football-skills/league-config/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.
<a href="https://agentmods.dev/skills/derekrbreese/fantasy-football-skills/league-config"><img src="https://agentmods.dev/badge/skills/derekrbreese/fantasy-football-skills/league-config.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00099 | $0.02367 |
| Opus 5 | $0.00049 | $0.01184 |
| Sonnet 5 | $0.00020 | $0.00473 |
| Haiku 4.5 | $0.00010 | $0.00237 |
Grade A, and why
league-config 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
League Configuration
Interview the user about their fantasy league(s) and persist the answers to leagues.md in the project root. Every other fantasy-football-skills skill reads this file first, so a complete interview here means the user is never re-asked for scoring or roster context.
Live platform source routing. Honor a browser the user explicitly names. If leagues.md records a Preferred browser, use that when it has a signed-in session for the platform. Otherwise use any authenticated browser the current assistant already has. For Yahoo league data, prefer an authenticated browser over a connector. If a Yahoo connector returns 403, unauthorized, or an equivalent authorization failure, do not retry it during the same task. For non-Yahoo platforms, use a purpose-built connector when it is available and returns complete current data; otherwise use the browser. Read league rosters, the free-agent pool, standings, transaction history, and any rankings site directly instead of making the user paste them. Timestamp live data and name the source. The session rules from roster-ops apply unchanged: the user's session is the auth; never ask for, read, store, or type credentials; use the visible UI rather than platform endpoints; and stop and hand back on any login, 2FA, captcha, consent, or unusual-activity screen. If no usable live source exists, state the access gap and do not fabricate league-specific analysis.
This skill may write leagues.md. It must never click anything that changes a roster, files a claim, or sends an offer.
Workflow
- Check for an existing
leagues.mdin the project root. If it exists, show the current config and ask whether to update a league, add a new one, or start over. Never silently overwrite. - Read the settings page first when a signed-in browser is available. Offer to open the league settings (and scoring/roster/waiver subpages) and extract every visible field below. Prefer the platform's exact wording for IDs, scoring magnitudes, and waiver rules. Ask only for what the page does not show.
- Interview the user for remaining gaps, one short batch of questions at a time (not one giant wall). Fall back to a full interview when no browser is available or the user prefers to type. Collect the fields below for each league.
- Write
leagues.mdusing the structure inleagues-template.md(in this skill's directory). One## League:section per league. Strip the template's explanatory comments from the written file — keep it clean. - Confirm by echoing back a one-line summary per league (e.g., "Gridiron Gazette — 12-team half-PPR on Yahoo, $100 FAAB").
What ships with it
1 file 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.
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.
- 12d ago First seen · 96 lines · 99 tokens per session scan A b09d9e58c1e0
league-config is a skill published in the GitHub repository derekrbreese/fantasy-football-skills (4 stars, last pushed 28d ago), licensed MIT. It adds 99 tokens to every session and 2,367 once invoked, about $0.0005 per session on Opus 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.
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