Mattermost에서 메시지를 검색합니다. 키워드, 사용자명(@username 또는 from:username), 날짜 등으로 검색할 수 있습니다. 검색 결과에는 자동으로 작성자의 이름(user_name)과 username이 포함됩니다.
AI agents call search_messages 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 performs message search and retrieval operations only. It queries existing data using filters (keywords, users, dates) and returns results without any side effects. No data is created, modified, deleted, or executed. Consistent with sibling tools like get_channel_messages, get_channels, and get_post_thread which are all read-only retrieval operations.
From the tool's definition Tool description states 'Mattermost에서 메시지를 검색합니다' (search messages in Mattermost) with search capabilities by keywords, usernames, and dates. Returns search results with author metadata. No modification, deletion, or execution capabilities mentioned.
Attacks that exploit this kind of access
Mattermost에서 메시지를 검색합니다. 키워드, 사용자명(@username 또는 from:username), 날짜 등으로 검색할 수 있습니다. 검색 결과에는 자동으로 작성자의 이름(user_name)과 username이 포함됩니다. 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 search_messages: 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.
search_messages 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 search_messages 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 search_messages. 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.
search_messages is provided by the Mattermost MCP Server MCP server (jhanglim/mattermost-mcp-server). 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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