AI agents use add-prompt to create or update resources in Dynamic MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Dynamic MCP Server environment.
This is a Write operation: it creates new data (prompts) that can be modified or deleted later, making it reversible. Severity is medium because prompt injection or misuse could lead to unintended behavior in downstream AI operations, but the blast radius is limited to prompt management and unlikely to cause financial or irreversible damage.
From the tool's definition Tool name is 'add-prompt' and description states 'Add a new prompt to the system', which creates new data (a prompt) in the system.
Documented attack patterns abuse exactly the kind of access add-prompt gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Dynamic MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for add-prompt:
{
"version": "1",
"default": "deny",
"tools": {
"add-prompt": {
"limits": [
{
"counter": "add-prompt_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}add-prompt 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.
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Add a new prompt to the system. It is categorised as a Write tool in the Dynamic MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Dynamic MCP Server MCP server in PolicyLayer and add a rule for add-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 Dynamic MCP Server. Nothing to install.
add-prompt 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 add-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 add-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.
add-prompt is provided by the Dynamic MCP Server MCP server (scitara-cto/dynamic-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Dynamic MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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18 Dynamic MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.