Read channel history with conversations.history.
AI agents call read_channel to retrieve information from Slack Max API MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical messages from a Slack channel using the conversations.history API endpoint. It is a query/retrieval operation with no side effects on data. While access to channel history could expose sensitive information in certain contexts, the tool itself performs only read operations and does not create, modify, delete, or execute actions.
From the tool's definition Tool name is 'read_channel' and description states it 'Read channel history with conversations.history', which retrieves message data without modification.
Attacks that exploit this kind of access
Read channel history with conversations.history. It is categorised as a Read tool in the Slack Max API MCP MCP Server, which means it retrieves data without modifying state.
Register the Slack Max API MCP server in PolicyLayer and add a rule for read_channel: 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 Max API MCP. Nothing to install.
read_channel 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 read_channel 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 read_channel. 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.
read_channel is provided by the Slack Max API MCP server (jeongwoobin335/slack-mcp). 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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