mark_read

Mark emails as read

SERVERNcp SOURCE@portel/ncp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/io-github-portel-dev-ncp/mark-read.md

WHAT IT DOES

What mark_read does on Ncp

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

RISK

Why mark_read is rated Medium

This tool modifies data (email read status) in a reversible manner. It does not retrieve/query (Read), execute arbitrary code (Execute), delete data (Destructive), or involve financial transactions (Financial). The severity is low because changing email read status has minimal blast radius—it affects only email metadata and can be easily undone by marking as unread.

From the tool's definition Tool name 'mark_read' and description 'Mark emails as read' indicate modification of email state/metadata. The action changes an email's read status from unread to read.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs mark_read safely

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

mark_read Rate-limited

mark_read 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": {
    "mark_read": {
      "limits": [
        {
          "counter": "mark_read_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 Ncp, apply this rule, and every mark_read call is checked against it from then on.

FAQ

Questions about mark_read

What does the mark_read tool do? +

Mark emails as read. It is categorised as a Write tool in the Ncp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on mark_read? +

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

What risk level is mark_read? +

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

Can I rate-limit mark_read? +

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

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

mark_read is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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sms_mark_read on Twilio SMS MCP Server →mark-as-read on Meme MCP Server → The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →