[API] Create a new TCP proxy for a service ⚡️ Best for: ✓ Setting up database access ✓ Configuring external connections ✓ Exposing TCP services ⚠️ Not for: × HTTP/HTTPS endpoints (use domain_create) × Internal service communication → Prerequisites: service_list → Alternatives: domain_create → Nex...
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AI agents use tcp_proxy_create to create or modify resources in Railway MCP Server. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call tcp_proxy_create repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Railway MCP Server.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"tcp_proxy_create": {
"limits": [
{
"counter": "tcp_proxy_create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Railway MCP Server policy for all 38 tools.
These attack patterns abuse exactly the kind of access tcp_proxy_create gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
[API] Create a new TCP proxy for a service ⚡️ Best for: ✓ Setting up database access ✓ Configuring external connections ✓ Exposing TCP services ⚠️ Not for: × HTTP/HTTPS endpoints (use domain_create) × Internal service communication → Prerequisites: service_list → Alternatives: domain_create → Next steps: tcp_proxy_list → Related: service_info, service_update. It is categorised as a Write tool in the Railway MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Railway MCP Server MCP server in PolicyLayer and add a rule for tcp_proxy_create: 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 Railway MCP Server. Nothing to install.
tcp_proxy_create is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the tcp_proxy_create 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 tcp_proxy_create. 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.
tcp_proxy_create is provided by the Railway MCP Server MCP server (jason-tan-swe/railway-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 38 Railway MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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