Get hover information for a symbol at the given position.
AI agents call symbol_info to retrieve information from Jons Mcp Java without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves hover information (type signatures, documentation, etc.) for a code symbol at a specified position. It performs a lookup query against the Java codebase with no side effects—no code execution, no data modification, and no destructive operations. The low severity reflects that misuse would only expose information already present in the codebase to the user.
From the tool's definition Tool name 'symbol_info' and description 'Get hover information for a symbol at the given position' indicate a query operation that retrieves metadata about code symbols without modifying or executing anything.
Attacks that exploit this kind of access
Get hover information for a symbol at the given position. It is categorised as a Read tool in the Jons Mcp Java MCP Server, which means it retrieves data without modifying state.
Register the Jons Mcp Java MCP server in PolicyLayer and add a rule for symbol_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 Jons Mcp Java. Nothing to install.
symbol_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 symbol_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 symbol_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.
symbol_info is provided by the Jons Mcp Java MCP server (jonmmease/jons-mcp-java). 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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