AI agents invoke execute_custom_sast_command to trigger actions in SAST MCP 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 permits execution of custom SAST commands on remote security VMs with effects dependent on the command arguments provided. Despite the empty description, the name and server context clearly indicate this is an Execute-category tool (code/command execution). An AI agent could misuse this to run arbitrary commands, access unintended systems, exfiltrate data, or manipulate security scanning behavior.
From the tool's definition Tool name is 'execute_custom_sast_command' which explicitly indicates execution of custom commands. Server description states it 'enables automated vulnerability scanning and security analysis' and supports 'remote execution on dedicated security VMs'.
Documented attack patterns abuse exactly the kind of access execute_custom_sast_command gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and SAST MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for execute_custom_sast_command:
{
"version": "1",
"default": "deny",
"tools": {
"execute_custom_sast_command": {
"limits": [
{
"counter": "execute_custom_sast_command_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}execute_custom_sast_command 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_custom_sast_command. It is categorised as a Execute tool in the SAST MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the SAST MCP Server MCP server in PolicyLayer and add a rule for execute_custom_sast_command: 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 SAST MCP Server. Nothing to install.
execute_custom_sast_command 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_custom_sast_command 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_custom_sast_command. 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_custom_sast_command is provided by the SAST MCP Server MCP server (sengtocxoen/sast-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from SAST MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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39 SAST MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.