The fundamental unit of any GraphQL Schema is the type. There are many kinds of types in GraphQL as represented by the
Part of the Mcp Tool Factory server.
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AI agents use __Type to create or modify resources in Mcp Tool Factory. 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 __Type 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 Mcp Tool Factory.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"__Type": {
"limits": [
{
"counter": "__type_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Mcp Tool Factory policy for all 27 tools.
These attack patterns abuse exactly the kind of access __Type 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.
The fundamental unit of any GraphQL Schema is the type. There are many kinds of types in GraphQL as represented by the. It is categorised as a Write tool in the Mcp Tool Factory MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Tool Factory MCP server in PolicyLayer and add a rule for __Type: 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 Mcp Tool Factory. Nothing to install.
__Type 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 __Type 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 __Type. 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.
__Type is provided by the Mcp Tool Factory MCP server (@heshamfsalama/mcp-tool-factory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 27 Mcp Tool Factory tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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