AI agents use create_branch to create or update resources in Azure DevOps MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Azure DevOps MCP Server environment.
Creating a branch is a reversible write operation that modifies repository state without deleting data or executing arbitrary code. While it affects version control workflows, the impact is limited in scope (local to branch management) and can be easily undone by deleting the branch. It does not rise to Execute (no arbitrary code execution) or Destructive (fully reversible).
From the tool's definition Tool creates a new branch from an existing one, which is a reversible modification of repository state. The description explicitly states 'Create a new branch', which is a Write operation (branch creation is a standard git operation that modifies repository…
Documented attack patterns abuse exactly the kind of access create_branch gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Azure DevOps MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_branch:
{
"version": "1",
"default": "deny",
"tools": {
"create_branch": {
"limits": [
{
"counter": "create_branch_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_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.
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Create a new branch from an existing one. It is categorised as a Write tool in the Azure DevOps MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Azure DevOps MCP Server MCP server in PolicyLayer and add a rule for create_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 Azure DevOps MCP Server. Nothing to install.
create_branch is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_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.
Set action: deny in the PolicyLayer policy for create_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.
create_branch is provided by the Azure DevOps MCP Server MCP server (tiberriver256/mcp-server-azure-devops). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 42 Azure DevOps MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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42 Azure DevOps MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.