Generates a custom MDMA prompt from structured input (domain, components, fields, steps). Returns only the custom prompt part — use buildSystemPrompt({ customPrompt }) in code to combine it with the base MDMA spec.
Risk signalsHigh parameter count (13 properties)
Part of the Mdma server.
Free to start. No card required.
AI agents invoke build-system-prompt to trigger processes or run actions in Mdma. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
build-system-prompt can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"build-system-prompt": {
"limits": [
{
"counter": "build-system-prompt_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Mdma policy for all 8 tools.
These attack patterns abuse exactly the kind of access build-system-prompt gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Generates a custom MDMA prompt from structured input (domain, components, fields, steps). Returns only the custom prompt part — use buildSystemPrompt({ customPrompt }) in code to combine it with the base MDMA spec.. It is categorised as a Execute tool in the Mdma MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Mdma MCP server in PolicyLayer and add a rule for build-system-prompt: 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 Mdma. Nothing to install.
build-system-prompt 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 build-system-prompt 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 build-system-prompt. 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.
build-system-prompt is provided by the Mdma MCP server (@mobile-reality/mdma-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Mdma tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.