Borrowing it
Nothing to install: this file belongs to Txpple/fvtt-mcp-molten5e. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Txpple/fvtt-mcp-molten5e/main/.claude/skills/start-session/SKILL.mdgit clone --depth 1 https://github.com/Txpple/fvtt-mcp-molten5eWrote 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/txpple/fvtt-mcp-molten5e/start-session)<a href="https://agentmods.dev/skills/txpple/fvtt-mcp-molten5e/start-session"><img src="https://agentmods.dev/badge/skills/txpple/fvtt-mcp-molten5e/start-session/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/txpple/fvtt-mcp-molten5e/start-session"><img src="https://agentmods.dev/badge/skills/txpple/fvtt-mcp-molten5e/start-session.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 | $0.00147 | $0.01179 |
| Opus 5 | $0.00073 | $0.00589 |
| Sonnet 5 | $0.00029 | $0.00236 |
| Haiku 4.5 | $0.00015 | $0.00118 |
Grade A, and why
start-session 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 8d 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 — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Start a work session
Bring the Molten-hosted Foundry world up and report its state. This is a thin orchestration skill: the mechanics (waking the sleeping VM and launching the world) are already baked into the bridge — do not re-implement them here. Any tool call triggers the bridge's cold-start path automatically.
How the cold-start actually works (context, not steps)
The headless bridge (src/foundry.ts) handles two distinct cold states on its
own, driven by .env config (MOLTEN_MAGIC_URL, MOLTEN_ADMIN_KEY,
MOLTEN_WORLD_ID):
- VM asleep → the bridge GETs the Magic URL to wake the EC2 box.
- VM up, no world active → the bridge logs into admin
/setupand launchesMOLTEN_WORLD_ID(game.post({action:'launchWorld', ...})). - World booting → it waits for the world to become joinable (~25s for the heavy dnd5e world, plus VM wake time on a fully cold box).
So you don't drive any of this manually. You just make one tool call and the bridge does the rest.
Steps
-
Set expectations, then trigger the boot. Tell the user a cold box can take ~30–60s (VM wake + ~25s world boot), then call
mcp__foundry-molten5e__get-world-info. This single call wakes + launches as needed and returns once the world is live. (If the world was already up, it returns immediately.) -
Report the state. Summarize the result clearly — world title/id, system
- version, Foundry version, and active users (confirm the
MCP-ClaudeGM bridge user is present, which doubles as a bridge-health check).
- version, Foundry version, and active users (confirm the
-
Light orientation (optional). If it's useful for what the user is about to do, also call
mcp__foundry-molten5e__get-current-sceneand mention the active scene. Keep this brief — don't enumerate the whole world unprompted. -
Hand off. End by asking what they want to work on, or proceed directly if the user already stated the next task in the same message.
If it fails
get-world-info failing almost always means the bridge couldn't reach or boot
the box — it is not a reason to start clicking around. Diagnose in this
order:
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.
- 8d ago First seen · 92 lines · 147 tokens per session scan A c398ff55b29a
start-session is a skill published in the GitHub repository Txpple/fvtt-mcp-molten5e (0 stars, last pushed 7d ago), licensed MIT. It adds 147 tokens to every session and 1,179 once invoked, about $0.0007 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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