Get the diff for a pull request
AI agents call get_pull_request_diff to retrieve information from Mcp Github without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and returns the differences between branches in a pull request without modifying any data. It is a pure read operation consistent with information retrieval tools like search, list, get, and fetch. No data is created, modified, deleted, or executed. The low severity reflects that misuse would only expose existing information already accessible to authorized users.
From the tool's definition Tool name 'get_pull_request_diff' and description 'Get the diff for a pull request' indicate a retrieval operation. The diff is read-only data about changes in a PR, with no side effects on the repository.
Attacks that exploit this kind of access
Get the diff for a pull request. It is categorised as a Read tool in the Mcp Github MCP Server, which means it retrieves data without modifying state.
Register the Mcp Github MCP server in PolicyLayer and add a rule for get_pull_request_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 Mcp Github. Nothing to install.
get_pull_request_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_pull_request_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_pull_request_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_pull_request_diff is provided by the Mcp Github MCP server (@missionsquad/mcp-github). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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