Inject proxy env vars and CA certificate into a Docker container. Two modes:
AI agents invoke interceptor_docker_attach to trigger actions in Proxy. 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 actively modifies a running Docker container by injecting environment variables and a CA certificate, which constitutes executing operations against an external system. Installing a CA certificate into a container is particularly sensitive as it allows MITM interception of TLS traffic.
From the tool's definition Inject proxy env vars and CA certificate into a Docker container
Documented attack patterns abuse exactly the kind of access interceptor_docker_attach gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for interceptor_docker_attach:
{
"version": "1",
"default": "deny",
"tools": {
"interceptor_docker_attach": {
"limits": [
{
"counter": "interceptor_docker_attach_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}interceptor_docker_attach 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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Inject proxy env vars and CA certificate into a Docker container. Two modes:. It is categorised as a Execute tool in the Proxy MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Proxy MCP server in PolicyLayer and add a rule for interceptor_docker_attach: 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 Proxy. Nothing to install.
interceptor_docker_attach 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 interceptor_docker_attach 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 interceptor_docker_attach. 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.
interceptor_docker_attach is provided by the Proxy MCP server (yfe404/proxy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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89 Proxy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.