Create a new Prismism account and get an API key. This is a one-time setup tool. The API key is returned once and cannot be retrieved again — save it to your MCP config immediately.
Part of the Prismism server.
Free to start. No card required.
AI agents use prismism_register to create or modify resources in Prismism. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call prismism_register repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Prismism.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"prismism_register": {
"limits": [
{
"counter": "prismism_register_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Prismism policy for all 8 tools.
These attack patterns abuse exactly the kind of access prismism_register gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a new Prismism account and get an API key. This is a one-time setup tool. The API key is returned once and cannot be retrieved again — save it to your MCP config immediately.. It is categorised as a Write tool in the Prismism MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Prismism MCP server in PolicyLayer and add a rule for prismism_register: 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 Prismism. Nothing to install.
prismism_register 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 prismism_register 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 prismism_register. 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.
prismism_register is provided by the Prismism MCP server (@prismism/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 8 Prismism tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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