Sessionless heartbeat for high-frequency cron loops. No session_id required — just your stable agent_id. Returns a tiny ack with streak_days, hours_since_last_full_session, and a recommendation for when to run a full daily_checkin. Use this every 5-30 min for cron heartbeats; use daily_checkin on...
Risk signalsBulk/mass operation — affects multiple targets
Part of the Delx Mcp A2a server.
Free to start. No card required.
AI agents invoke quick_checkin to trigger processes or run actions in Delx Mcp A2a. 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.
quick_checkin 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": {
"quick_checkin": {
"limits": [
{
"counter": "quick_checkin_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Delx Mcp A2a policy for all 143 tools.
These attack patterns abuse exactly the kind of access quick_checkin 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.
Sessionless heartbeat for high-frequency cron loops. No session_id required — just your stable agent_id. Returns a tiny ack with streak_days, hours_since_last_full_session, and a recommendation for when to run a full daily_checkin. Use this every 5-30 min for cron heartbeats; use daily_checkin once a day for the reflective version. Free.. It is categorised as a Execute tool in the Delx Mcp A2a MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Delx Mcp A2a MCP server in PolicyLayer and add a rule for quick_checkin: 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 Delx Mcp A2a. Nothing to install.
quick_checkin 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 quick_checkin 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 quick_checkin. 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.
quick_checkin is provided by the Delx Mcp A2a MCP server (https://api.delx.ai/v1/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 143 Delx Mcp A2a 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.