Set or remove the favicon image for a game. This image will be displayed as the browser favicon when viewing this game in the web UI. Should be a square image (ideally 32x32 or larger).
AI agents use set_game_favicon to create or update resources in DMCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your DMCP environment.
This tool modifies game metadata (the favicon asset) in a way that is fully reversible—the favicon can be changed or removed without consequence. It does not execute code, delete data permanently, or move money. It fits the Write category as a data modification operation.
From the tool's definition The tool 'set_game_favicon' creates or modifies a UI asset (favicon image) for a game. The description states it will 'Set or remove the favicon image', which are reversible operations that change game state without deleting data irreversibly or executing…
Documented attack patterns abuse exactly the kind of access set_game_favicon gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and DMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for set_game_favicon:
{
"version": "1",
"default": "deny",
"tools": {
"set_game_favicon": {
"limits": [
{
"counter": "set_game_favicon_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_game_favicon 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.
Set or remove the favicon image for a game. This image will be displayed as the browser favicon when viewing this game in the web UI. Should be a square image (ideally 32x32 or larger). It is categorised as a Write tool in the DMCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the D MCP server in PolicyLayer and add a rule for set_game_favicon: 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 DMCP. Nothing to install.
set_game_favicon 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 set_game_favicon 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 set_game_favicon. 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.
set_game_favicon is provided by the D MCP server (shawnrushefsky/dmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from DMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
204 DMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.