This record as markdown: /tools/serac/snow-install-application.md
What snow_install_application does on Serac
AI agents invoke snow_install_application to trigger actions in Serac. 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.
Why snow_install_application is rated High
Installing an application from a store is an external operation that changes the state of the ServiceNow environment in a significant way (deploying code, modifying configurations, adding tables/records). It is not purely destructive (it doesn't delete data), but it executes an external operation with broad side effects.
From the tool's definition "Install application from store" — triggers an external installation operation that modifies the ServiceNow instance by deploying a new application
Attacks that exploit this kind of access
The rule that runs snow_install_application safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Serac, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For snow_install_application, this is the rule to start with:
snow_install_application 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Serac, apply this rule, and every snow_install_application call is checked against it from then on.
Questions about snow_install_application
Install application from store. It is categorised as a Execute tool in the Serac MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Serac MCP server in PolicyLayer and add a rule for snow_install_application: 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 Serac. Nothing to install.
snow_install_application 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 snow_install_application 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 snow_install_application. 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.
snow_install_application is provided by the Serac MCP server (serac-labs/serac). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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