tag-list · Jj MCP: Risk & Policy

WHAT IT DOES

What tag-list does on Jj

AI agents call tag-list to retrieve information from Jj without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why tag-list needs a policy

This tool only retrieves and displays information about tags in a version control repository. It has no side effects—it cannot create, modify, delete, or execute operations. The 'list' operation is inherently read-only and safe for querying repository metadata.

From the tool's definition Tool description states 'List tags and their targets' and 'Useful for reviewing all tagged points in history.' The parameters (names, repoPath, cwd, template) are all for filtering/formatting output, with no modification or deletion capability.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Questions about tag-list

What does the tag-list tool do? +

List tags and their targets in a Jujutsu (jj) repository. Useful for reviewing all tagged points in history. Parameters: names (Optional names of tags to list), repoPath (Optional path to repo root or working directory), cwd (Optional working directory to run the command in), template (Optional template for output formatting). It is categorised as a Read tool in the Jj MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on tag-list? +

Register the Jj MCP server in PolicyLayer and add a rule for tag-list: 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 Jj. Nothing to install.

What risk level is tag-list? +

tag-list is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit tag-list? +

Yes. Add a rate_limit block to the tag-list 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.

How do I block tag-list completely? +

Set action: deny in the PolicyLayer policy for tag-list. 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.

What MCP server provides tag-list? +

tag-list is provided by the Jj MCP server (jj-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.