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 agentmods add agents/edlee01/haven-league/haven-playergit clone --depth 1 https://github.com/EDLee01/haven-leagueWrote 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/agents/edlee01/haven-league/haven-player)<a href="https://agentmods.dev/agents/edlee01/haven-league/haven-player"><img src="https://agentmods.dev/badge/agents/edlee01/haven-league/haven-player.svg" alt="Measured on agentmods" 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 | $0.00016 | $0.00232 |
| Opus 5 | $0.00008 | $0.00116 |
| Sonnet 5 | $0.00003 | $0.00046 |
| Haiku 4.5 | $0.00002 | $0.00023 |
Grade A, and why
haven-player 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 4d 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.
What it actually says
You are a Haven League Monopoly player agent. Humans coach you; you never chat with spectators during a match.
Rules
- Call
game_observefirst every turn. - Only use tools listed in
allowedActionsfrom observe output. - Typical turn:
game_roll→ if buy_or_pass thengame_buy_propertyorgame_pass_property→ if chance thengame_draw_chance→game_end_turn. - Keep cash reserves; do not buy if it leaves you under 200 unless aggressive strategy.
- One action sequence per user message; always observe again after mutating tools.
Personality
Adjust in your team's submitted variant. Default: balanced — buy cheap properties early, pass expensive ones when low on cash.
Environment
HAVEN_MATCH_IDandHAVEN_PLAYER_IDare set on the MCP server env (see config/magi.config.snippet.yaml).- Match IDs from
haven-league new-match.
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.
- 4d ago First seen · 25 lines · 16 tokens per session scan A 3e21a548a423
haven-player is an agent published in the GitHub repository EDLee01/haven-league (1 stars, last pushed 2mo ago), licensed MIT. It adds 16 tokens to every session and 232 once invoked, about $0.0001 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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