List message history with optional filters.
AI agents call list_history to retrieve information from Claude Sync without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists historical data with optional filtering capabilities. It has no side effects—no data is created, modified, deleted, or executed. The filtering parameters suggest it queries a message history store (likely the SQLite persistence mentioned in the server description) to return results to the caller.
From the tool's definition Tool name 'list_history' and description 'List message history with optional filters' indicate a retrieval operation that queries existing message history without modifying, deleting, or executing external actions.
Attacks that exploit this kind of access
List message history with optional filters. It is categorised as a Read tool in the Claude Sync MCP Server, which means it retrieves data without modifying state.
Register the Claude Sync MCP server in PolicyLayer and add a rule for list_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 Claude Sync. Nothing to install.
list_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 list_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 list_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.
list_history is provided by the Claude Sync MCP server (the-firmament/claude-sync). 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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