AI agents use flag to create or update resources in Minesweeper MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Minesweeper MCP Server environment.
This tool modifies game state by placing a flag on the Minesweeper board. It is a reversible write operation (flags can be removed via the 'unflag' sibling tool). No real-world data, finances, or destructive actions are involved; the blast radius is minimal as it only affects an in-game state.
From the tool's definition Place a flag at a cell on the Minesweeper board
Documented attack patterns abuse exactly the kind of access flag gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Minesweeper MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for flag:
{
"version": "1",
"default": "deny",
"tools": {
"flag": {
"limits": [
{
"counter": "flag_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}flag 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.
Free to start. No card required.
Place a flag at a cell on the Minesweeper board. It is categorised as a Write tool in the Minesweeper MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Minesweeper MCP Server MCP server in PolicyLayer and add a rule for flag: 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 Minesweeper MCP Server. Nothing to install.
flag is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the flag 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 flag. 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.
flag is provided by the Minesweeper MCP Server MCP server (tonypan2/minesweeper-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Minesweeper MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4 Minesweeper MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.