Time-scoped digest: yesterday's performance, anything that degraded this week, today's activity so far, and unread notification count. Strictly retrospective — for routing ("what should I do next?") call orient_me instead.
Part of the ACR — Agent Composition Records server.
Free to start. No card required.
AI agents invoke whats_new to trigger processes or run actions in ACR — Agent Composition Records. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
whats_new can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"whats_new": {
"limits": [
{
"counter": "whats_new_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full ACR — Agent Composition Records policy for all 30 tools.
These attack patterns abuse exactly the kind of access whats_new gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Time-scoped digest: yesterday's performance, anything that degraded this week, today's activity so far, and unread notification count. Strictly retrospective — for routing ("what should I do next?") call orient_me instead.. It is categorised as a Execute tool in the ACR — Agent Composition Records MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the ACR — Agent Composition Records MCP server in PolicyLayer and add a rule for whats_new: 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 ACR — Agent Composition Records. Nothing to install.
whats_new is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the whats_new 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 whats_new. 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.
whats_new is provided by the ACR — Agent Composition Records MCP server (@tethral/acr-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 30 ACR — Agent Composition Records 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.