AI agents call search-by-title 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 queries vault metadata (note titles) to locate notes. It performs a read-only search operation with no side effects, no data modification, and no ability to execute code or trigger external operations. The blast radius of misuse is minimal—an agent could discover notes but cannot alter or delete them.
From the tool's definition Tool name is 'search-by-title' and description states 'Search for notes by their H1 title' — a retrieval operation with no modification or deletion.
Documented attack patterns abuse exactly the kind of access search-by-title 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 search-by-title:
{
"version": "1",
"default": "deny",
"tools": {
"search-by-title": {}
}
}search-by-title is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search for notes by their H1 title. 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 search-by-title: 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.
search-by-title 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-by-title 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-by-title. 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-by-title is provided by the Obsidian MCP Server MCP server (piotr1215/mcp-obsidian). 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.
Free to start. No card required.
9 Obsidian MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.