set_default_repo

THE RISK

Medium Risk

Why set_default_repo needs a policy

This tool modifies stored configuration (the default repository setting) but does not create, delete, or execute operations against repository data itself. It is reversible (the default can be changed again) and has no direct side effects on code or data. Therefore, it is classified as Write rather than Execute.

From the tool's definition Tool name 'set_default_repo' and description 'Set a default repository for subsequent operations' indicate modification of configuration/preferences state.

Documented attack patterns abuse exactly the kind of access set_default_repo gives an agent:

POLICY

How to control set_default_repo

PolicyLayer is an MCP gateway — it sits between your AI agents and GitHub Repos Manager MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for set_default_repo:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "set_default_repo": {
      "limits": [
        {
          "counter": "set_default_repo_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

set_default_repo stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register GitHub Repos Manager MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More GitHub Repos Manager MCP Server tools

Destructive delete_deploy_key Remove deploy keys. Destructive delete_file Delete a file from a repository. Destructive delete_issue_comment Delete an issue comment Destructive delete_label Delete a label from a repository Destructive delete_milestone Delete a milestone Destructive delete_webhook Remove webhooks. Execute cancel_workflow_run Cancel running workflows. Execute trigger_workflow Manually trigger workflow dispatches (handle input parameters).

All 84 GitHub Repos Manager MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about set_default_repo

What does the set_default_repo tool do? +

Set a default repository for subsequent operations. It is categorised as a Write tool in the GitHub Repos Manager MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on set_default_repo? +

Register the GitHub Repos Manager MCP Server MCP server in PolicyLayer and add a rule for set_default_repo: 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 GitHub Repos Manager MCP Server. Nothing to install.

What risk level is set_default_repo? +

set_default_repo is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit set_default_repo? +

Yes. Add a rate_limit block to the set_default_repo 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 set_default_repo completely? +

Set action: deny in the PolicyLayer policy for set_default_repo. 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 set_default_repo? +

set_default_repo is provided by the GitHub Repos Manager MCP Server MCP server (kurdin/github-repos-manager-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GitHub Repos Manager MCP Server tool call.

Start from GitHub Repos Manager MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →