Marks a specific Slack reminder as complete using its reminder ID; DEPRECATED: This Slack API endpoint ('reminders.complete') was deprecated in March 2023 and is not recommended for new applications.
Part of the Slack server.
Free to start. No card required.
AI agents use SLACK_MARK_REMINDER_AS_COMPLETE to create or modify resources in Slack. 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 SLACK_MARK_REMINDER_AS_COMPLETE 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 Slack.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"SLACK_MARK_REMINDER_AS_COMPLETE": {
"limits": [
{
"counter": "slack_mark_reminder_as_complete_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Slack policy for all 143 tools.
These attack patterns abuse exactly the kind of access SLACK_MARK_REMINDER_AS_COMPLETE 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.
Marks a specific Slack reminder as complete using its reminder ID; DEPRECATED: This Slack API endpoint ('reminders.complete') was deprecated in March 2023 and is not recommended for new applications.. It is categorised as a Write tool in the Slack MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Slack MCP server in PolicyLayer and add a rule for SLACK_MARK_REMINDER_AS_COMPLETE: 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 Slack. Nothing to install.
SLACK_MARK_REMINDER_AS_COMPLETE 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 SLACK_MARK_REMINDER_AS_COMPLETE 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 SLACK_MARK_REMINDER_AS_COMPLETE. 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.
SLACK_MARK_REMINDER_AS_COMPLETE is provided by the Slack MCP server (@modelcontextprotocol/server-slack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 143 Slack tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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