Rules that triggered on HTTP 2xx responses — likely false positives. Critical for WAF tuning.
AI agents call waf_fp_candidates to retrieve information from WAF MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only analysis tool that queries WAF event logs to identify potential false positives. While it doesn't modify rules or configuration, the medium severity reflects that misuse could lead to inappropriate rule disabling decisions if an agent acts on incomplete or adversarial data. The tool itself performs no destructive or state-changing operations.
From the tool's definition Tool returns 'Rules that triggered on HTTP 2xx responses' — a diagnostic query that retrieves log data without modifying WAF state. Named as 'candidates' (informational) rather than action-oriented verbs like enable/disable/deny.
Attacks that exploit this kind of access
Rules that triggered on HTTP 2xx responses — likely false positives. Critical for WAF tuning. It is categorised as a Read tool in the WAF MCP Server MCP Server, which means it retrieves data without modifying state.
Register the WAF MCP Server MCP server in PolicyLayer and add a rule for waf_fp_candidates: 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 WAF MCP Server. Nothing to install.
waf_fp_candidates 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 waf_fp_candidates 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 waf_fp_candidates. 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.
waf_fp_candidates is provided by the WAF MCP Server MCP server (kratosuae/waf_mcp). 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.
Teams ship this data inside their own products. See what a licence covers →