substack_live_blog_start · Substack MCP Server MCP

WHAT IT DOES

What substack_live_blog_start does on Substack MCP Server

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

WHY IT NEEDS A POLICY

Why substack_live_blog_start needs a policy

Starting a live blog session creates a new ongoing session/state on the platform. This is a Write operation as it creates a new resource (live blogging session). It is reversible given the sibling tool 'substack_live_blog_end' exists to end/close the session. Severity is medium because misuse could publish unintended live content to subscribers.

From the tool's definition 'Start a live blogging session' — initiates a new live blog session on Substack

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

substack_live_blog_start Rate-limited

substack_live_blog_start 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": {
    "substack_live_blog_start": {
      "limits": [
        {
          "counter": "substack_live_blog_start_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Substack MCP Server, so you can run agents against it safely.

FAQ

Questions about substack_live_blog_start

What does the substack_live_blog_start tool do? +

Start a live blogging session. It is categorised as a Write tool in the Substack MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on substack_live_blog_start? +

Register the Substack MCP Server MCP server in PolicyLayer and add a rule for substack_live_blog_start: 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 Substack MCP Server. Nothing to install.

What risk level is substack_live_blog_start? +

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

Can I rate-limit substack_live_blog_start? +

Yes. Add a rate_limit block to the substack_live_blog_start 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 substack_live_blog_start completely? +

Set action: deny in the PolicyLayer policy for substack_live_blog_start. 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 substack_live_blog_start? +

substack_live_blog_start is provided by the Substack MCP Server MCP server (jessicaruthabbott/my-substack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

substack_live_blog_start is one line of Substack MCP Server's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

Teams ship this data inside their own products. See what a licence covers →