sync_manager_branch

THE RISK

Medium Risk

Why sync_manager_branch needs a policy

The tool synchronizes a manager branch with main branch changes, which modifies the manager branch's state by pulling in updates. This is a Write operation—it creates or modifies data reversibly (typical of git sync/merge operations).

From the tool's definition Tool name 'sync_manager_branch' and description 'Sync manager branch with latest main branch changes' indicate a write operation that modifies branch state through synchronization. This is a git/version control operation that updates data reversibly.

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

POLICY

How to control sync_manager_branch

PolicyLayer is an MCP gateway — it sits between your AI agents and tmux-claude MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for sync_manager_branch:

policy.json

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

sync_manager_branch 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 tmux-claude 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 →

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EXPLORE

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All 26 tmux-claude MCP Server tools →

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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 sync_manager_branch

What does the sync_manager_branch tool do? +

Sync manager branch with latest main branch changes (Manager only). It is categorised as a Write tool in the tmux-claude 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 sync_manager_branch? +

Register the tmux-claude MCP Server MCP server in PolicyLayer and add a rule for sync_manager_branch: 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 tmux-claude MCP Server. Nothing to install.

What risk level is sync_manager_branch? +

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

Can I rate-limit sync_manager_branch? +

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

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

sync_manager_branch is provided by the tmux-claude MCP Server MCP server (michael-abdo/tmux-claude-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every tmux-claude MCP Server tool call.

Start from tmux-claude 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 →