Find the AST node at a specific position. Args: project: Project name path: File path relative to project root row: Line number (0-based) column: Column number (0-based) Returns: Node information or None if not found
AI agents call get_node_at_position to retrieve information from Tree Sitter without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a pure read operation on code analysis data. It queries the tree-sitter AST to locate and return node information at specified coordinates (row, column). No side effects, code execution, data modification, or deletion occurs. The tool is a foundational read capability for code introspection and analysis without operational risk.
From the tool's definition get_node_at_position retrieves node information from an Abstract Syntax Tree at a specific code position; it returns node data without modifying, deleting, or executing any code.
Risk signalsAdmin/system-level operation
Documented attack patterns abuse exactly the kind of access get_node_at_position gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Tree Sitter, and nothing reaches the server without passing your rules. This is the rule we recommend for get_node_at_position:
{
"version": "1",
"default": "deny",
"tools": {
"get_node_at_position": {}
}
}get_node_at_position is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Find the AST node at a specific position. Args: project: Project name path: File path relative to project root row: Line number (0-based) column: Column number (0-based) Returns: Node information or None if not found. It is categorised as a Read tool in the Tree Sitter MCP Server, which means it retrieves data without modifying state.
Register the Tree Sitter MCP server in PolicyLayer and add a rule for get_node_at_position: 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 Tree Sitter. Nothing to install.
get_node_at_position 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 get_node_at_position 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 get_node_at_position. 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.
get_node_at_position is provided by the Tree Sitter MCP server (wrale/mcp-server-tree-sitter). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 26 Tree Sitter tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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26 Tree Sitter tools catalogued and risk-classified — across an index of 42,500+ MCP servers.