AI agents invoke kobold_txt2img to trigger actions in Kobold MCP Server. 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.
This tool triggers an external image generation operation (Stable Diffusion via KoboldAI), executing a compute-intensive process that produces output based on arguments. It is not a simple read/query, nor does it delete data or move money. It falls under Execute as it triggers an external operation whose effects depend on the provided prompt arguments.
From the tool's definition Generate image from text prompt
Documented attack patterns abuse exactly the kind of access kobold_txt2img gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Kobold MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for kobold_txt2img:
{
"version": "1",
"default": "deny",
"tools": {
"kobold_txt2img": {
"limits": [
{
"counter": "kobold_txt2img_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}kobold_txt2img 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.
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Generate image from text prompt. It is categorised as a Execute tool in the Kobold MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Kobold MCP Server MCP server in PolicyLayer and add a rule for kobold_txt2img: 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 Kobold MCP Server. Nothing to install.
kobold_txt2img is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the kobold_txt2img 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 kobold_txt2img. 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.
kobold_txt2img is provided by the Kobold MCP Server MCP server (phialsbasement/koboldcpp-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Kobold MCP Server, 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.
20 Kobold MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.