Get hover information for a symbol at the specified position in a Swift file.
AI agents call swift_get_hover_info 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 pure information retrieval—it queries the SourceKit-LSP for hover/documentation information about symbols without side effects. No code is executed, modified, or deleted. The blast radius of misuse is negligible; an agent could only retrieve more information than intended, which has no security impact on the codebase itself.
From the tool's definition Tool retrieves hover information for a symbol at a specified position in a Swift file. The description uses 'Get' and describes a query operation that returns compiler-grade code understanding data without modifying, executing, or deleting anything.
Documented attack patterns abuse exactly the kind of access swift_get_hover_info 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_get_hover_info:
{
"version": "1",
"default": "deny",
"tools": {
"swift_get_hover_info": {}
}
}swift_get_hover_info is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get hover information for a symbol at the specified position in a Swift file. 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_get_hover_info: 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_get_hover_info 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_get_hover_info 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_get_hover_info. 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_get_hover_info 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.