Get the default branch of a repository.
AI agents call get_default_branch to retrieve information from Bitbucket Server MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves repository metadata (the default branch name) without modifying, executing code, deleting data, or creating financial obligations. It is a simple read-only query operation with no side effects. The blast radius of misuse is minimal—an attacker could only learn which branch is designated as default, which is typically non-sensitive repository configuration data.
From the tool's definition Tool name is 'get_default_branch' and description states 'Get the default branch of a repository.' The verb 'get' indicates retrieval of information.
Attacks that exploit this kind of access
Get the default branch of a repository. It is categorised as a Read tool in the Bitbucket Server MCP MCP Server, which means it retrieves data without modifying state.
Register the Bitbucket Server MCP server in PolicyLayer and add a rule for get_default_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 Bitbucket Server MCP. Nothing to install.
get_default_branch 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 get_default_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 get_default_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.
get_default_branch is provided by the Bitbucket Server MCP server (manpreetshuann/bitbucket-server-mcp). 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.
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