Fetches all messages in a specific thread by channel and thread timestamp. Supports pagination.
AI agents call conversations_replies 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 thread messages from Slack without creating, modifying, or deleting any data. It is a pure read operation on conversation history. The blast radius is minimal—misuse would expose Slack message content but cannot alter or delete information, making it a low-severity read tool.
From the tool's definition Tool name 'conversations_replies' and description 'Fetches all messages in a specific thread' indicate retrieval of existing data with no modification capabilities. The mention of pagination suggests iteration over read-only results.
Attacks that exploit this kind of access
Fetches all messages in a specific thread by channel and thread timestamp. Supports pagination. 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 conversations_replies: 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.
conversations_replies 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 conversations_replies 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 conversations_replies. 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.
conversations_replies is provided by the Slack MCP Server MCP server (oregpt/agenticledger_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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