create_line

Create a new versioned API line. Requires edit access.

SERVEREchoRelay SOURCEhttps://mcp.echorelay.dev

Medium RISK CLASS

Category Write

Parameters 22 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/dev-echorelay-management/create-line.md

WHAT IT DOES

What create_line does on EchoRelay

AI agents use create_line to create or update resources in EchoRelay, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your EchoRelay environment.

Parameter	Type	Required	Description
`name`	string	Yes	Human-readable line name.
`lineKey`	string	Yes	URL key, lowercase letters/digits/hyphens, e.g. "v1".

Parameters from the server's own tool schema.

RISK

Why create_line is rated Medium

This tool creates new data (API line) reversibly rather than executing arbitrary operations or deleting data. Creation of infrastructure components like API lines may have downstream effects (billing, quota allocation) but the action itself is Write-category.

From the tool's definition Tool name 'create_line' and description 'Create a new versioned API line' indicate data creation. Server context includes billing and subscription management, suggesting creation has resource implications.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs create_line safely

PolicyLayer is an MCP gateway: it sits between your AI agents and EchoRelay, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For create_line, this is the rule to start with:

create_line Rate-limited

create_line stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_line": {
      "limits": [
        {
          "counter": "create_line_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect EchoRelay, apply this rule, and every create_line call is checked against it from then on.

FAQ

Questions about create_line

What does the create_line tool do? +

Create a new versioned API line. Requires edit access. It is categorised as a Write tool in the EchoRelay MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does create_line accept? +

create_line accepts 2 parameters: name, lineKey. Required: name, lineKey. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on create_line? +

Register the EchoRelay MCP server in PolicyLayer and add a rule for create_line: 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 EchoRelay. Nothing to install.

What risk level is create_line? +

create_line is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit create_line? +

Yes. Add a rate_limit block to the create_line 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.

How do I block create_line completely? +

Set action: deny in the PolicyLayer policy for create_line. 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.

What MCP server provides create_line? +

create_line is provided by the EchoRelay MCP server (https://mcp.echorelay.dev). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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