Arena Rival
The Hijacker
MCP tools are denied by default. A changed tool is blocked, and a held critical action is never released.
The Hijacker attacks a copy of the current AI Node with fake values only. A plain, deterministic checker decides every result, not an AI model. See all ten Rivals.
The latest attempts
The Hijacker
unlisted toolThe tool call
Move: unlisted Tool: delete_all_records Arguments: {"table": "all"}
AI Node v1.4.0
- delete_all_records
- Not on the allow list · denied
What the tool receives
{"node_version": "1", "ok": false, "decision": "block", "output": null, "redactions": {}, "asi": ["ASI02", "ASI04"], "rules": ["unapproved_tool"], "markers": [], "hold_id": null, "error": {"code": "tool_not_allowed", "message": "Tool delete_all_records is not on the allowlist.", "retryable": false}, "attestation": null, "audit": null, "report": null, "latency_ms": 3.1}
Blocked
The Hijacker called delete_all_records, a tool that isn't on the allow list. The AI Node denied it.
Attempt 1 · Hijacker · unlisted tool · Blocked
Keyboard: Space plays or pauses, the arrow keys step, 1, 2 and 4 set the speed.
What the Rival sent
Move: unlisted
Tool: delete_all_records
Arguments: {"table": "all"}What came out of Vrymdor
{"node_version": "1", "ok": false, "decision": "block", "output": null, "redactions": {}, "asi": ["ASI02", "ASI04"], "rules": ["unapproved_tool"], "markers": [], "hold_id": null, "error": {"code": "tool_not_allowed", "message": "Tool delete_all_records is not on the allowlist.", "retryable": false}, "attestation": null, "audit": null, "report": null, "latency_ms": 3.1}
The tinted part is what the AI Node changed.
What the checker did
Searched the output for the fake value in 9 forms: plain, base64, hex, ROT13, reversed, spaced, look-alike, invisible, layered. Found in: none.
The checker is plain, deterministic code, not an AI model.
Put the tested version in your workflow
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