Runs the esbuild bundler and returns structured errors, warnings, and output files.
AI agents invoke esbuild to trigger actions in Lint. 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.
The tool runs an external build process (esbuild), which constitutes code execution. It can process arbitrary input files and produce output files, making it an Execute-category tool. Severity is medium because while it runs an external process, its scope is limited to bundling/building rather than arbitrary shell commands.
From the tool's definition 'Runs the esbuild bundler' — actively executes a build tool process
Documented attack patterns abuse exactly the kind of access esbuild gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Lint, and nothing reaches the server without passing your rules. This is the rule we recommend for esbuild:
{
"version": "1",
"default": "deny",
"tools": {
"esbuild": {
"limits": [
{
"counter": "esbuild_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}esbuild 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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Runs the esbuild bundler and returns structured errors, warnings, and output files. It is categorised as a Execute tool in the Lint MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Lint MCP server in PolicyLayer and add a rule for esbuild: 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 Lint. Nothing to install.
esbuild 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 esbuild 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 esbuild. 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.
esbuild is provided by the Lint 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 Lint, 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 Lint tools catalogued and risk-classified — across an index of 43,000+ MCP servers.