[API] Update a domain's configuration ⚡️ Best for: ✓ Changing target ports ✓ Updating domain settings ✓ Reconfiguring endpoints ⚠️ Not for: × Changing domain names (delete and recreate instead) × TCP proxy configuration → Prerequisites: domain_list → Next steps: domain_list → Related: service_update
Part of the Railway MCP Server server.
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AI agents use domain_update 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 domain_update 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": {
"domain_update": {
"limits": [
{
"counter": "domain_update_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 domain_update 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] Update a domain's configuration ⚡️ Best for: ✓ Changing target ports ✓ Updating domain settings ✓ Reconfiguring endpoints ⚠️ Not for: × Changing domain names (delete and recreate instead) × TCP proxy configuration → Prerequisites: domain_list → Next steps: domain_list → Related: 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 domain_update: 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.
domain_update 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 domain_update 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 domain_update. 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.
domain_update 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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