AI agents call extract_errors to retrieve information from Xcsift without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'extract_errors' paired with the server's documented purpose of parsing and extracting diagnostic information suggests this retrieves error data from build output. No description is provided (lowering confidence slightly), but the consistent pattern of sibling extraction tools and the server's read-focused design indicate this is a data retrieval tool with no side effects or code execution capability.
From the tool's definition Tool name 'extract_errors' combined with sibling tools 'extract_test_failures', 'extract_warnings', 'parse_xcodebuild_output', and 'get_build_summary' indicates this tool queries and extracts structured information from build output without modifying or…
Documented attack patterns abuse exactly the kind of access extract_errors gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Xcsift, and nothing reaches the server without passing your rules. This is the rule we recommend for extract_errors:
{
"version": "1",
"default": "deny",
"tools": {
"extract_errors": {}
}
}extract_errors is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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extract_errors. It is categorised as a Read tool in the Xcsift MCP Server, which means it retrieves data without modifying state.
Register the Xcsift MCP server in PolicyLayer and add a rule for extract_errors: 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 Xcsift. Nothing to install.
extract_errors 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 extract_errors 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 extract_errors. 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.
extract_errors is provided by the Xcsift MCP server (johnnyclem/xcsift-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Xcsift, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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9 Xcsift tools catalogued and risk-classified — across an index of 43,000+ MCP servers.