Create a new character (PC or NPC). IMPORTANT: Call this IMMEDIATELY when introducing any named NPC in narrative, BEFORE continuing the scene. Every named character mentioned in dialogue or description should exist in the database.
AI agents use create_character 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.
The tool creates new character records in a game state database, which is a write operation that modifies data reversibly. Characters can be deleted or modified later, and this occurs within a contained RPG game environment with no external side effects, financial implications, or destructive operations. The blast radius of misuse is limited to the game state of a single RPG session.
From the tool's definition Tool description states 'Create a new character' and context shows it adds game entities to the database, which is a reversible creation operation.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access create_character 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 create_character:
{
"version": "1",
"default": "deny",
"tools": {
"create_character": {
"limits": [
{
"counter": "create_character_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_character 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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Create a new character (PC or NPC). IMPORTANT: Call this IMMEDIATELY when introducing any named NPC in narrative, BEFORE continuing the scene. Every named character mentioned in dialogue or description should exist in the database. 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 create_character: 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.
create_character 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 create_character 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 create_character. 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.
create_character 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.