AI agents call get_callers to retrieve information from Srclight without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves caller information from a code index—a query operation with no side effects. It navigates the call graph (mentioned in server description) to discover which functions/methods call a given symbol. No data is modified, deleted, or executed; it purely returns analytical results. The empty description lowers confidence slightly, but the name and sibling tools strongly suggest read-only intent.
From the tool's definition Tool name 'get_callers' combined with server purpose 'Deep code indexing' and sibling tools like 'find_pattern', 'find_imports', 'codebase_map', and 'blame_symbol' all indicate read-only analysis.
Documented attack patterns abuse exactly the kind of access get_callers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Srclight, and nothing reaches the server without passing your rules. This is the rule we recommend for get_callers:
{
"version": "1",
"default": "deny",
"tools": {
"get_callers": {}
}
}get_callers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_callers. It is categorised as a Read tool in the Srclight MCP Server, which means it retrieves data without modifying state.
Register the Srclight MCP server in PolicyLayer and add a rule for get_callers: 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 Srclight. Nothing to install.
get_callers 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_callers 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_callers. 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_callers is provided by the Srclight MCP server (srclight/srclight). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 42 Srclight tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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42 Srclight tools catalogued and risk-classified — across an index of 42,500+ MCP servers.