Build graph structure from vault links (nodes/edges)
AI agents call generate_graph_data to retrieve information from Obsidian MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads existing note links in the vault and builds a graph data structure (nodes and edges) from them. It does not modify, create, or delete any data; it only retrieves and organizes existing relationship data. Severity is low as misuse would only expose vault structure information.
From the tool's definition 'Build graph structure from vault links (nodes/edges)' — reads and analyzes existing links to construct a graph representation
Documented attack patterns abuse exactly the kind of access generate_graph_data gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Obsidian MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for generate_graph_data:
{
"version": "1",
"default": "deny",
"tools": {
"generate_graph_data": {}
}
}generate_graph_data is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Build graph structure from vault links (nodes/edges). It is categorised as a Read tool in the Obsidian MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Obsidian MCP Server MCP server in PolicyLayer and add a rule for generate_graph_data: 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 Obsidian MCP Server. Nothing to install.
generate_graph_data 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 generate_graph_data 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 generate_graph_data. 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.
generate_graph_data is provided by the Obsidian MCP Server MCP server (kynlos/obsidian-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Obsidian MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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120 Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.