Search FoundryVTT compendium packs by name and metadata. Searches all enabled compendiums by default; the compendiumId filter scopes to one pack. Requires the REST API module (FOUNDRY_API_KEY).
AI agents call search_compendium to retrieve information from FoundryVTT MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information from FoundryVTT compendium packs—game content libraries (spells, items, creatures, etc.). It performs lookups and filtering without creating, modifying, or deleting data. The scope is limited to reading existing compendium content. While it requires API authentication (FOUNDRY_API_KEY), authentication itself does not elevate the risk category.
From the tool's definition Tool explicitly searches and queries compendium packs by name and metadata with no modification capability. The verb 'search' and the read-only nature of querying compendium data without side effects aligns with retrieval operations.
Documented attack patterns abuse exactly the kind of access search_compendium gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FoundryVTT MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for search_compendium:
{
"version": "1",
"default": "deny",
"tools": {
"search_compendium": {}
}
}search_compendium is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Search FoundryVTT compendium packs by name and metadata. Searches all enabled compendiums by default; the compendiumId filter scopes to one pack. Requires the REST API module (FOUNDRY_API_KEY). It is categorised as a Read tool in the FoundryVTT MCP Server MCP Server, which means it retrieves data without modifying state.
Register the FoundryVTT MCP Server MCP server in PolicyLayer and add a rule for search_compendium: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches FoundryVTT MCP Server. Nothing to install.
search_compendium is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the search_compendium rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for search_compendium. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
search_compendium is provided by the FoundryVTT MCP Server MCP server (laurigates/foundryvtt-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from FoundryVTT MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
25 FoundryVTT MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.