get_mattermost_users
AI agents call get_mattermost_users to retrieve information from Mattermost 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 user information with no side effects, fitting the Read category. Severity is medium rather than low because user lists/profiles can reveal organizational structure and employee data, which could be sensitive if exposed to unauthorized parties. Confidence is reduced from high to 0.85 due to the empty tool description, though the name and server context strongly suggest a read operation.
From the tool's definition Tool name 'get_mattermost_users' indicates retrieval of user data; server description states it 'provides a comprehensive suite of tools for reading channel history' and enables 'managing user profiles.' The 'get_' prefix is typical of read operations.
Attacks that exploit this kind of access
get_mattermost_users. It is categorised as a Read tool in the Mattermost MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Mattermost MCP Server MCP server in PolicyLayer and add a rule for get_mattermost_users: 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 Mattermost MCP Server. Nothing to install.
get_mattermost_users 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 get_mattermost_users 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 get_mattermost_users. 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.
get_mattermost_users is provided by the Mattermost MCP Server MCP server (vnikhilbuddhavarapu/mattermost-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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