Fetch branches and bookmarks from a Git remote into a Jujutsu (jj) repository. Similar to git fetch but preserves the jj-specific state. Parameters: remote (Remote to fetch from, default: origin), repoPath (Optional path to repo root or working directory), cwd (Optional working directory to run t...
AI agents call git-fetch 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.
Even though git-fetch only reads data, uncontrolled read access leaks sensitive information and racks up API costs — an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
Fetch branches and bookmarks from a Git remote into a Jujutsu (jj) repository. Similar to git fetch but preserves the jj-specific state. Parameters: remote (Remote to fetch from, default: origin), repoPath (Optional path to repo root or working directory), cwd (Optional working directory to run the command in), branches (Optional branch/patterns to fetch, can specify multiple). It is categorised as a Read tool in the Jj MCP Server, which means it retrieves data without modifying state.
Register the Jj MCP server in PolicyLayer and add a rule for git-fetch: 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.
git-fetch 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 git-fetch 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 git-fetch. 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.
git-fetch 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →