AI agents call fetch_channel_history to retrieve information from Sendbird without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves chat history from a channel with no destructive, financial, or code-execution implications. While it accesses potentially sensitive message data, the action itself is a passive query.
From the tool's definition Tool name 'fetch_channel_history' and description explicitly states 'Retrieve the chronological message history' — a read-only operation that queries existing data without modification or side effects.
Attacks that exploit this kind of access
Retrieve the chronological message history of a specific chat channel. Returns up to N messages before a timestamp. It is categorised as a Read tool in the Sendbird MCP Server, which means it retrieves data without modifying state.
Register the Sendbird MCP server in PolicyLayer and add a rule for fetch_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 Sendbird. Nothing to install.
fetch_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 fetch_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 fetch_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.
fetch_channel_history is provided by the Sendbird MCP server (nobanks/sendbird-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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