List all indexed channels and their document counts.
AI agents call list_channels to retrieve information from Slack Indexed without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about available channels and statistics (document counts) from the indexed Slack data. It performs a passive read operation with no side effects, no data modification, and no execution of code or commands. The blast radius of misuse is minimal—an agent could only gain knowledge of which channels exist and their relative sizes, which is low-risk information exposure.
From the tool's definition Tool name 'list_channels' combined with description 'List all indexed channels and their document counts' indicates a retrieval operation that queries channel metadata without modifying, deleting, or executing any operations.
Attacks that exploit this kind of access
List all indexed channels and their document counts. It is categorised as a Read tool in the Slack Indexed MCP Server, which means it retrieves data without modifying state.
Register the Slack Indexed MCP server in PolicyLayer and add a rule for list_channels: 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 Indexed. Nothing to install.
list_channels 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 list_channels 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 list_channels. 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.
list_channels is provided by the Slack Indexed MCP server (kanvabhatia-alaan/alaan-slack-indexed-mcp-tool). 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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