Regex pattern extraction with context. Use for structured data mining, format analysis, content auditing.
AI agents call pattern_search to retrieve information from Obsidian Modified without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only searches and extracts data from existing notes using regex patterns. It retrieves information with no side effects, matching the Read category definition. The stated use cases (data mining, format analysis, auditing) are all read-only operations. Severity is low because misuse would at worst leak information already accessible to the user within their own vault.
From the tool's definition Tool performs 'Regex pattern extraction with context' for 'structured data mining, format analysis, content auditing' — all read-only analysis operations. No modification, deletion, or command execution mentioned.
Attacks that exploit this kind of access
Regex pattern extraction with context. Use for structured data mining, format analysis, content auditing. It is categorised as a Read tool in the Obsidian Modified MCP Server, which means it retrieves data without modifying state.
Register the Obsidian Modified MCP server in PolicyLayer and add a rule for pattern_search: 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 Modified. Nothing to install.
pattern_search 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 pattern_search 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 pattern_search. 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.
pattern_search is provided by the Obsidian Modified MCP server (@marwansaab/obsidian-modified-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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