Bazel build system operations: build, test, query, info, run, clean, fetch.
AI agents invoke bazel to trigger actions in Cargo. 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 invokes Bazel, a build system that executes arbitrary build targets, tests, and commands. While 'query', 'info', and 'fetch' are read-like operations, the presence of 'build', 'test', and 'run' establishes this as an Execute category tool. An AI agent could execute malicious build targets or arbitrary code through Bazel.
From the tool's definition Tool description explicitly lists 'build, test, query, info, run, clean, fetch' - operations that execute external code and system commands through Bazel's build system. The 'run' and 'build' verbs are particularly indicative of code execution.
Documented attack patterns abuse exactly the kind of access bazel gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Cargo, and nothing reaches the server without passing your rules. This is the rule we recommend for bazel:
{
"version": "1",
"default": "deny",
"tools": {
"bazel": {
"limits": [
{
"counter": "bazel_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}bazel 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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Bazel build system operations: build, test, query, info, run, clean, fetch. It is categorised as a Execute tool in the Cargo MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Cargo MCP server in PolicyLayer and add a rule for bazel: 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 Cargo. Nothing to install.
bazel 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 bazel 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 bazel. 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.
bazel is provided by the Cargo MCP server (Dave-London/Pare). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Cargo, 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.
202 Cargo tools catalogued and risk-classified — across an index of 43,000+ MCP servers.