Build and run an executable target in a Swift package using
AI agents invoke swift_package_run to trigger actions in XcodeBazelMCP. 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 directly executes code by building and running Swift package targets. While the description is incomplete, the core semantics of 'run' combined with 'executable target' clearly indicate code execution. An AI agent misusing this could execute arbitrary Swift code with the permissions of the build system, making it Execute rather than Write.
From the tool's definition Tool description explicitly states 'Build and run an executable target' which indicates execution of code.
Documented attack patterns abuse exactly the kind of access swift_package_run gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and XcodeBazelMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for swift_package_run:
{
"version": "1",
"default": "deny",
"tools": {
"swift_package_run": {
"limits": [
{
"counter": "swift_package_run_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}swift_package_run 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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Build and run an executable target in a Swift package using. It is categorised as a Execute tool in the XcodeBazelMCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the XcodeBazel MCP server in PolicyLayer and add a rule for swift_package_run: 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 XcodeBazelMCP. Nothing to install.
swift_package_run 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 swift_package_run 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 swift_package_run. 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.
swift_package_run is provided by the XcodeBazel MCP server (xcodebazelmcp/xcodebazelmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from XcodeBazelMCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
117 XcodeBazelMCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.