AI agents call lsp_folding_ranges to retrieve information from Lsp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
lsp_folding_ranges retrieves metadata about code structure (function and class boundaries, comment blocks, imports) from a Language Server Protocol server. This is a read-only query operation that provides syntactic information about a file without executing code, modifying data, or triggering side effects.
From the tool's definition Tool description states 'Get the foldable regions' and 'Use as a quick structural overview before reading specific sections.' The verb 'Get' and the framing as a read-only structural query indicate pure information retrieval with no modification or execution.
Attacks that exploit this kind of access
Get the foldable regions of a file (functions, classes, blocks, imports, comments). Use as a quick structural overview before reading specific sections. It is categorised as a Read tool in the Lsp MCP Server, which means it retrieves data without modifying state.
Register the Lsp MCP server in PolicyLayer and add a rule for lsp_folding_ranges: 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 Lsp. Nothing to install.
lsp_folding_ranges 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 lsp_folding_ranges 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 lsp_folding_ranges. 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.
lsp_folding_ranges is provided by the Lsp MCP server (lsp-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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