List all available tags on the Discourse site (if tagging is enabled). Returns tag names and usage counts. Use tags in search queries with #tagname.
AI agents call discourse_list_tags to retrieve information from Discourse MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
discourse_list_tags performs a simple informational query that retrieves and displays existing tag data. It does not create, modify, delete, or execute any operations. The blast radius of misuse is minimal—an agent could only learn what tags exist on the forum, which is typically public information. This is a straightforward Read category tool.
From the tool's definition Tool description states it 'List all available tags' and 'Returns tag names and usage counts.' These are read-only retrieval operations with no side effects. The tool only queries and returns metadata about existing tags.
Attacks that exploit this kind of access
List all available tags on the Discourse site (if tagging is enabled). Returns tag names and usage counts. Use tags in search queries with #tagname. It is categorised as a Read tool in the Discourse MCP MCP Server, which means it retrieves data without modifying state.
Register the Discourse MCP server in PolicyLayer and add a rule for discourse_list_tags: 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 Discourse MCP. Nothing to install.
discourse_list_tags 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 discourse_list_tags 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 discourse_list_tags. 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.
discourse_list_tags is provided by the Discourse MCP server (king-of-the-grackles/discourse-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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