AI agents call get_pr_diff to retrieve information from Bitbucket without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and displays pull request diff information without making any modifications, creating new resources, executing code, deleting data, or committing financial transactions. It is a straightforward data retrieval operation with no side effects, making it a Read category tool. The severity is low because viewing diffs poses minimal security risk when accessed appropriately.
From the tool's definition Tool name is 'get_pr_diff' and description states it 'Fetch[es] the unified diff for a pull request' and 'Returns the raw text diff'.
Attacks that exploit this kind of access
Fetch the unified diff for a pull request. Returns the raw text diff, suitable for reviewing what the PR changes. It is categorised as a Read tool in the Bitbucket MCP Server, which means it retrieves data without modifying state.
Register the Bitbucket MCP server in PolicyLayer and add a rule for get_pr_diff: 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. Nothing to install.
get_pr_diff 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_pr_diff 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_pr_diff. 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_pr_diff is provided by the Bitbucket MCP server (jacobpixleratgather/bitbucket-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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