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 trade-negotiationgit 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/trade-negotiation)<a href="https://agentmods.dev/skills/derekrbreese/fantasy-football-skills/trade-negotiation"><img src="https://agentmods.dev/badge/skills/derekrbreese/fantasy-football-skills/trade-negotiation/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/trade-negotiation"><img src="https://agentmods.dev/badge/skills/derekrbreese/fantasy-football-skills/trade-negotiation.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 | $0.00129 | $0.01801 |
| Opus 5 | $0.00064 | $0.00901 |
| Sonnet 5 | $0.00026 | $0.00360 |
| Haiku 4.5 | $0.00013 | $0.00180 |
Grade A, and why
trade-negotiation 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 — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Trade Negotiation: The Back-and-Forth
Turn a stalled or countered trade into a closed deal — or a clean walk-away. This skill manages the sequence of offers; use trade-evaluation for the underlying math whenever a new construction appears.
Step 1: Establish the negotiation state
Gather: the offer history so far (every version, in order), the current offer on the table, what the other manager has said (their words carry their priorities), and both teams' standings. Read leagues.md from the project root for the trade deadline, playoff weeks, and trade-review method — the deadline is the clock every negotiation runs on. If the file is missing or those fields are blank, ask for them directly and suggest running the fantasy-league-setup:league-config skill to persist the answers. If leagues.md defines more than one league, use the one marked (default) unless the user names another.
State the advice as of a concrete date/time, and refresh any stale injuries, role changes, or deadline context before treating the current counter as live. If an injury update is what moved the price, require both the official team/game status and a second credible source before repricing around it.
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.
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 · 58 lines · 129 tokens per session scan A 36442674d974
trade-negotiation is a skill published in the GitHub repository derekrbreese/fantasy-football-skills (4 stars, last pushed 28d ago), licensed MIT. It adds 129 tokens to every session and 1,801 once invoked, about $0.0006 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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