block_set_block_time · AF_ MCP: Risk & Policy

WHAT IT DOES

What block_set_block_time does on AF_MCP

AI agents use block_set_block_time to create or update resources in AF_MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AF_MCP environment.

WHY IT NEEDS A POLICY

Why block_set_block_time needs a policy

This tool creates or modifies configuration data (blocking duration settings) in a reversible manner. It changes how long attackers remain blocked but does not irreversibly delete data (thus not Destructive) nor directly execute arbitrary code (thus not Execute). The Write category is appropriate as it updates security device configuration.

From the tool's definition Tool name 'block_set_block_time' and description '修改自动封锁攻击者时间配置' (modify automatic blocking attacker time configuration) indicates this tool modifies/updates configuration settings for automatic blocking duration.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

block_set_block_time Rate-limited

block_set_block_time stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "block_set_block_time": {
      "limits": [
        {
          "counter": "block_set_block_time_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about block_set_block_time

What does the block_set_block_time tool do? +

修改自动封锁攻击者时间配置。. It is categorised as a Write tool in the AF_MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on block_set_block_time? +

Register the AF_ MCP server in PolicyLayer and add a rule for block_set_block_time: 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 AF_MCP. Nothing to install.

What risk level is block_set_block_time? +

block_set_block_time is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit block_set_block_time? +

Yes. Add a rate_limit block to the block_set_block_time 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 block_set_block_time completely? +

Set action: deny in the PolicyLayer policy for block_set_block_time. 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 block_set_block_time? +

block_set_block_time is provided by the AF_ MCP server (xiaqijun/af_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.