Mark messages in a channel as read up to a specific timestamp. Updates YOUR read position, not the bot
AI agents use mark_slack_channel_as_read to create or update resources in Apple Shortcuts — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Apple Shortcuts environment.
This tool modifies state reversibly by updating the user's read position marker in Slack. It does not retrieve data (Read), execute arbitrary operations (Execute), delete anything (Destructive), nor involve money (Financial). The change is reversible by marking additional messages as read or unread.
From the tool's definition Tool description: 'Mark messages in a channel as read up to a specific timestamp.' The verb 'mark' and action of updating read position indicates state modification.
Documented attack patterns abuse exactly the kind of access mark_slack_channel_as_read gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Apple Shortcuts, and nothing reaches the server without passing your rules. This is the rule we recommend for mark_slack_channel_as_read:
{
"version": "1",
"default": "deny",
"tools": {
"mark_slack_channel_as_read": {
"limits": [
{
"counter": "mark_slack_channel_as_read_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}mark_slack_channel_as_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.
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Mark messages in a channel as read up to a specific timestamp. Updates YOUR read position, not the bot. It is categorised as a Write tool in the Apple Shortcuts MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Apple Shortcuts MCP server in PolicyLayer and add a rule for mark_slack_channel_as_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 Apple Shortcuts. Nothing to install.
mark_slack_channel_as_read 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 mark_slack_channel_as_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.
Set action: deny in the PolicyLayer policy for mark_slack_channel_as_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.
mark_slack_channel_as_read is provided by the Apple Shortcuts MCP server (@mindstone/mcp-server-apple-shortcuts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Apple Shortcuts, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
423 Apple Shortcuts tools catalogued and risk-classified — across an index of 43,000+ MCP servers.