Find all regex/string matches in Swift file content with line/char positions and snippets.
AI agents call swift_search_pattern to retrieve information from SwiftLens without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation on Swift source files. It searches for patterns and returns matching results with context, but does not modify files, execute code, delete data, or trigger external side effects. The sibling tools (get_hover_info, get_symbol_definition, etc.) are all inspection/analysis tools, consistent with a Read classification.
From the tool's definition Tool searches for and retrieves regex/string matches in Swift file content, returning line/character positions and code snippets. The description indicates only data retrieval with no modification, deletion, or execution capabilities.
Documented attack patterns abuse exactly the kind of access swift_search_pattern gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SwiftLens, and nothing reaches the server without passing your rules. This is the rule we recommend for swift_search_pattern:
{
"version": "1",
"default": "deny",
"tools": {
"swift_search_pattern": {}
}
}swift_search_pattern is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Find all regex/string matches in Swift file content with line/char positions and snippets. It is categorised as a Read tool in the SwiftLens MCP Server, which means it retrieves data without modifying state.
Register the SwiftLens MCP server in PolicyLayer and add a rule for swift_search_pattern: 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 SwiftLens. Nothing to install.
swift_search_pattern 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 swift_search_pattern 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 swift_search_pattern. 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.
swift_search_pattern is provided by the SwiftLens MCP server (swiftlens/swiftlens). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 SwiftLens tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
15 SwiftLens tools catalogued and risk-classified — across an index of 42,500+ MCP servers.