Execute a workflow that coordinates multiple embedded devices
AI agents invoke execute_cross_device_workflow to trigger actions in MCP Prompts Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool triggers external operations on multiple devices (Android devices, based on sibling tools like android_launch_app, android_play_sound, android_show_toast). Execution of cross-device workflows is inherently an Execute-category action because: (1) it runs/triggers commands or operations rather than merely reading or writing data, (2) the actual effects depend on workflow definition and device configuration…
From the tool's definition Tool name and description explicitly state 'Execute a workflow' and 'coordinates multiple embedded devices' — indicating invocation of operations across external systems whose effects depend on runtime arguments and device state.
Documented attack patterns abuse exactly the kind of access execute_cross_device_workflow gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Prompts Server, and nothing reaches the server without passing your rules. This is the rule we recommend for execute_cross_device_workflow:
{
"version": "1",
"default": "deny",
"tools": {
"execute_cross_device_workflow": {
"limits": [
{
"counter": "execute_cross_device_workflow_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}execute_cross_device_workflow stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Execute a workflow that coordinates multiple embedded devices. It is categorised as a Execute tool in the MCP Prompts Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the MCP Prompts Server MCP server in PolicyLayer and add a rule for execute_cross_device_workflow: 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 Prompts Server. Nothing to install.
execute_cross_device_workflow 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 execute_cross_device_workflow 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 execute_cross_device_workflow. 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.
execute_cross_device_workflow is provided by the MCP Prompts Server MCP server (sparesparrow/mcp-prompts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 51 MCP Prompts Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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51 MCP Prompts Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.