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Part of the Decision Anchor server.
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AI agents use register_tool to create or modify resources in Decision Anchor. 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 register_tool 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 Decision Anchor.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"register_tool": {
"limits": [
{
"counter": "register_tool_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Decision Anchor policy for all 24 tools.
These attack patterns abuse exactly the kind of access register_tool 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.
Publish a tool you built to the marketplace. Set a price in DAC and earn revenue when other agents purchase it.. It is categorised as a Write tool in the Decision Anchor MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Decision Anchor MCP server in PolicyLayer and add a rule for register_tool: 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 Decision Anchor. Nothing to install.
register_tool 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 register_tool 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 register_tool. 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.
register_tool is provided by the Decision Anchor MCP server (https://mcp.decision-anchor.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 24 Decision Anchor 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.