cap_query · Sflight MCP: Risk & Policy

WHAT IT DOES

What cap_query does on Sflight

AI agents invoke cap_query to trigger actions in Sflight. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why cap_query needs a policy

The tool executes queries against a live CAP service. While named 'query', execution of CQL/OData queries can include write or destructive operations depending on the query content (e.g., DELETE, UPDATE statements in CQL). Even if limited to reads, running arbitrary queries against a live service constitutes Execute-level risk.

From the tool's definition "Execute a CQL or OData-style query against the running CAP service"

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cap_query Rate-limited

cap_query stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "cap_query": {
      "limits": [
        {
          "counter": "cap_query_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Sflight, so you can run agents against it safely.

FAQ

Questions about cap_query

What does the cap_query tool do? +

Execute a CQL or OData-style query against the running CAP service. It is categorised as a Execute tool in the Sflight MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on cap_query? +

Register the Sflight MCP server in PolicyLayer and add a rule for cap_query: 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 Sflight. Nothing to install.

What risk level is cap_query? +

cap_query is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit cap_query? +

Yes. Add a rate_limit block to the cap_query 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.

How do I block cap_query completely? +

Set action: deny in the PolicyLayer policy for cap_query. 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.

What MCP server provides cap_query? +

cap_query is provided by the Sflight MCP server (mindsetconsulting/sflight-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.