Obter histórico de mensagens de um canal
AI agents call get_slack_channel_history to retrieve information from Slack MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves message history from a Slack channel, which is a read-only data retrieval operation. However, severity is elevated to 'medium' rather than 'low' because channel history may contain sensitive business communications, intellectual property, personal information, or confidential discussions—typical blast radius concerns for an AI agent with unrestricted access to retrieve and process this data…
From the tool's definition Tool name: get_slack_channel_history. Description: 'Obter histórico de mensagens de um canal' (Get message history from a channel). The tool retrieves and queries historical message data without modifying, deleting, or executing operations.
Attacks that exploit this kind of access
Obter histórico de mensagens de um canal. It is categorised as a Read tool in the Slack MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Slack MCP Server MCP server in PolicyLayer and add a rule for get_slack_channel_history: 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 MCP Server. Nothing to install.
get_slack_channel_history is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the get_slack_channel_history 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 get_slack_channel_history. 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.
get_slack_channel_history is provided by the Slack MCP Server MCP server (will2023a/mcp-slack). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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